diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-03 10:31:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-03 10:31:38 -0700 |
| commit | 1873e50028ce87dd9014049c86d71a898fa02166 (patch) | |
| tree | 046d37339278c3b88f0c248e9e6ff5fed804fe62 /arch | |
| parent | fb2af0020a51709ad87ea8055c325d3fbde04158 (diff) | |
| parent | aa729dccb5e8dfbc78e2e235b8754d6acccee731 (diff) | |
| download | linux-1873e50028ce87dd9014049c86d71a898fa02166.tar.bz2 | |
Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64
Pull ARM64 updates from Catalin Marinas:
"Main features:
- KVM and Xen ports to AArch64
- Hugetlbfs and transparent huge pages support for arm64
- Applied Micro X-Gene Kconfig entry and dts file
- Cache flushing improvements
For arm64 huge pages support, there are x86 changes moving part of
arch/x86/mm/hugetlbpage.c into mm/hugetlb.c to be re-used by arm64"
* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64: (66 commits)
arm64: Add initial DTS for APM X-Gene Storm SOC and APM Mustang board
arm64: Add defines for APM ARMv8 implementation
arm64: Enable APM X-Gene SOC family in the defconfig
arm64: Add Kconfig option for APM X-Gene SOC family
arm64/Makefile: provide vdso_install target
ARM64: mm: THP support.
ARM64: mm: Raise MAX_ORDER for 64KB pages and THP.
ARM64: mm: HugeTLB support.
ARM64: mm: Move PTE_PROT_NONE bit.
ARM64: mm: Make PAGE_NONE pages read only and no-execute.
ARM64: mm: Restore memblock limit when map_mem finished.
mm: thp: Correct the HPAGE_PMD_ORDER check.
x86: mm: Remove general hugetlb code from x86.
mm: hugetlb: Copy general hugetlb code from x86 to mm.
x86: mm: Remove x86 version of huge_pmd_share.
mm: hugetlb: Copy huge_pmd_share from x86 to mm.
arm64: KVM: document kernel object mappings in HYP
arm64: KVM: MAINTAINERS update
arm64: KVM: userspace API documentation
arm64: KVM: enable initialization of a 32bit vcpu
...
Diffstat (limited to 'arch')
68 files changed, 5297 insertions, 359 deletions
diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h index 30cdacb675af..359a7b50b158 100644 --- a/arch/arm/include/asm/xen/page.h +++ b/arch/arm/include/asm/xen/page.h @@ -1,7 +1,6 @@ #ifndef _ASM_ARM_XEN_PAGE_H #define _ASM_ARM_XEN_PAGE_H -#include <asm/mach/map.h> #include <asm/page.h> #include <asm/pgtable.h> @@ -88,6 +87,6 @@ static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn) return __set_phys_to_machine(pfn, mfn); } -#define xen_remap(cookie, size) __arm_ioremap((cookie), (size), MT_MEMORY); +#define xen_remap(cookie, size) ioremap_cached((cookie), (size)); #endif /* _ASM_ARM_XEN_PAGE_H */ diff --git a/arch/arm/kvm/arch_timer.c b/arch/arm/kvm/arch_timer.c index c55b6089e923..49a7516d81c7 100644 --- a/arch/arm/kvm/arch_timer.c +++ b/arch/arm/kvm/arch_timer.c @@ -195,6 +195,7 @@ static struct notifier_block kvm_timer_cpu_nb = { static const struct of_device_id arch_timer_of_match[] = { { .compatible = "arm,armv7-timer", }, + { .compatible = "arm,armv8-timer", }, {}, }; diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 56b3f6d447ae..4143d9b0d87a 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -7,6 +7,7 @@ config ARM64 select ARM_AMBA select ARM_ARCH_TIMER select ARM_GIC + select BUILDTIME_EXTABLE_SORT select CLONE_BACKWARDS select COMMON_CLK select GENERIC_CLOCKEVENTS @@ -111,6 +112,11 @@ config ARCH_VEXPRESS This enables support for the ARMv8 software model (Versatile Express). +config ARCH_XGENE + bool "AppliedMicro X-Gene SOC Family" + help + This enables support for AppliedMicro X-Gene SOC Family + endmenu menu "Bus support" @@ -148,6 +154,8 @@ config NR_CPUS int "Maximum number of CPUs (2-32)" range 2 32 depends on SMP + # These have to remain sorted largest to smallest + default "8" if ARCH_XGENE default "4" source kernel/Kconfig.preempt @@ -180,8 +188,35 @@ config HW_PERF_EVENTS Enable hardware performance counter support for perf events. If disabled, perf events will use software events only. +config SYS_SUPPORTS_HUGETLBFS + def_bool y + +config ARCH_WANT_GENERAL_HUGETLB + def_bool y + +config ARCH_WANT_HUGE_PMD_SHARE + def_bool y if !ARM64_64K_PAGES + +config HAVE_ARCH_TRANSPARENT_HUGEPAGE + def_bool y + source "mm/Kconfig" +config XEN_DOM0 + def_bool y + depends on XEN + +config XEN + bool "Xen guest support on ARM64 (EXPERIMENTAL)" + depends on ARM64 && OF + help + Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64. + +config FORCE_MAX_ZONEORDER + int + default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE) + default "11" + endmenu menu "Boot options" diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index c95c5cb212fd..d90cf79f233a 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -37,6 +37,8 @@ TEXT_OFFSET := 0x00080000 export TEXT_OFFSET GZFLAGS core-y += arch/arm64/kernel/ arch/arm64/mm/ +core-$(CONFIG_KVM) += arch/arm64/kvm/ +core-$(CONFIG_XEN) += arch/arm64/xen/ libs-y := arch/arm64/lib/ $(libs-y) libs-y += $(LIBGCC) @@ -60,6 +62,10 @@ zinstall install: vmlinux dtbs: scripts $(Q)$(MAKE) $(build)=$(boot)/dts dtbs +PHONY += vdso_install +vdso_install: + $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@ + # We use MRPROPER_FILES and CLEAN_FILES now archclean: $(Q)$(MAKE) $(clean)=$(boot) diff --git a/arch/arm64/boot/dts/Makefile b/arch/arm64/boot/dts/Makefile index 68457e9e0975..c52bdb051f66 100644 --- a/arch/arm64/boot/dts/Makefile +++ b/arch/arm64/boot/dts/Makefile @@ -1,4 +1,5 @@ dtb-$(CONFIG_ARCH_VEXPRESS) += rtsm_ve-aemv8a.dtb foundation-v8.dtb +dtb-$(CONFIG_ARCH_XGENE) += apm-mustang.dtb targets += dtbs targets += $(dtb-y) diff --git a/arch/arm64/boot/dts/apm-mustang.dts b/arch/arm64/boot/dts/apm-mustang.dts new file mode 100644 index 000000000000..1247ca1200b1 --- /dev/null +++ b/arch/arm64/boot/dts/apm-mustang.dts @@ -0,0 +1,26 @@ +/* + * dts file for AppliedMicro (APM) Mustang Board + * + * Copyright (C) 2013, Applied Micro Circuits Corporation + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + */ + +/dts-v1/; + +/include/ "apm-storm.dtsi" + +/ { + model = "APM X-Gene Mustang board"; + compatible = "apm,mustang", "apm,xgene-storm"; + + chosen { }; + + memory { + device_type = "memory"; + reg = < 0x1 0x00000000 0x0 0x80000000 >; /* Updated by bootloader */ + }; +}; diff --git a/arch/arm64/boot/dts/apm-storm.dtsi b/arch/arm64/boot/dts/apm-storm.dtsi new file mode 100644 index 000000000000..bfdc57834929 --- /dev/null +++ b/arch/arm64/boot/dts/apm-storm.dtsi @@ -0,0 +1,116 @@ +/* + * dts file for AppliedMicro (APM) X-Gene Storm SOC + * + * Copyright (C) 2013, Applied Micro Circuits Corporation + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + */ + +/ { + compatible = "apm,xgene-storm"; + interrupt-parent = <&gic>; + #address-cells = <2>; + #size-cells = <2>; + + cpus { + #address-cells = <2>; + #size-cells = <0>; + + cpu@000 { + device_type = "cpu"; + compatible = "apm,potenza", "arm,armv8"; + reg = <0x0 0x000>; + enable-method = "spin-table"; + cpu-release-addr = <0x1 0x0000fff8>; + }; + cpu@001 { + device_type = "cpu"; + compatible = "apm,potenza", "arm,armv8"; + reg = <0x0 0x001>; + enable-method = "spin-table"; + cpu-release-addr = <0x1 0x0000fff8>; + }; + cpu@100 { + device_type = "cpu"; + compatible = "apm,potenza", "arm,armv8"; + reg = <0x0 0x100>; + enable-method = "spin-table"; + cpu-release-addr = <0x1 0x0000fff8>; + }; + cpu@101 { + device_type = "cpu"; + compatible = "apm,potenza", "arm,armv8"; + reg = <0x0 0x101>; + enable-method = "spin-table"; + cpu-release-addr = <0x1 0x0000fff8>; + }; + cpu@200 { + device_type = "cpu"; + compatible = "apm,potenza", "arm,armv8"; + reg = <0x0 0x200>; + enable-method = "spin-table"; + cpu-release-addr = <0x1 0x0000fff8>; + }; + cpu@201 { + device_type = "cpu"; + compatible = "apm,potenza", "arm,armv8"; + reg = <0x0 0x201>; + enable-method = "spin-table"; + cpu-release-addr = <0x1 0x0000fff8>; + }; + cpu@300 { + device_type = "cpu"; + compatible = "apm,potenza", "arm,armv8"; + reg = <0x0 0x300>; + enable-method = "spin-table"; + cpu-release-addr = <0x1 0x0000fff8>; + }; + cpu@301 { + device_type = "cpu"; + compatible = "apm,potenza", "arm,armv8"; + reg = <0x0 0x301>; + enable-method = "spin-table"; + cpu-release-addr = <0x1 0x0000fff8>; + }; + }; + + gic: interrupt-controller@78010000 { + compatible = "arm,cortex-a15-gic"; + #interrupt-cells = <3>; + interrupt-controller; + reg = <0x0 0x78010000 0x0 0x1000>, /* GIC Dist */ + <0x0 0x78020000 0x0 0x1000>, /* GIC CPU */ + <0x0 0x78040000 0x0 0x2000>, /* GIC VCPU Control */ + <0x0 0x78060000 0x0 0x2000>; /* GIC VCPU */ + interrupts = <1 9 0xf04>; /* GIC Maintenence IRQ */ + }; + + timer { + compatible = "arm,armv8-timer"; + interrupts = <1 0 0xff01>, /* Secure Phys IRQ */ + <1 13 0xff01>, /* Non-secure Phys IRQ */ + <1 14 0xff01>, /* Virt IRQ */ + <1 15 0xff01>; /* Hyp IRQ */ + clock-frequency = <50000000>; + }; + + soc { + compatible = "simple-bus"; + #address-cells = <2>; + #size-cells = <2>; + ranges; + + serial0: serial@1c020000 { + device_type = "serial"; + compatible = "ns16550"; + reg = <0 0x1c020000 0x0 0x1000>; + reg-shift = <2>; + clock-frequency = <10000000>; /* Updated by bootloader */ + interrupt-parent = <&gic>; + interrupts = <0x0 0x4c 0x4>; + }; + }; +}; diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig index 8d9696adb440..5b3e83217b03 100644 --- a/arch/arm64/configs/defconfig +++ b/arch/arm64/configs/defconfig @@ -24,6 +24,7 @@ CONFIG_MODULE_UNLOAD=y # CONFIG_BLK_DEV_BSG is not set # CONFIG_IOSCHED_DEADLINE is not set CONFIG_ARCH_VEXPRESS=y +CONFIG_ARCH_XGENE=y CONFIG_SMP=y CONFIG_PREEMPT_VOLUNTARY=y CONFIG_CMDLINE="console=ttyAMA0" @@ -54,6 +55,9 @@ CONFIG_INPUT_EVDEV=y # CONFIG_SERIO_I8042 is not set # CONFIG_SERIO_SERPORT is not set CONFIG_LEGACY_PTY_COUNT=16 +CONFIG_SERIAL_8250=y +CONFIG_SERIAL_8250_CONSOLE=y +CONFIG_SERIAL_OF_PLATFORM=y CONFIG_SERIAL_AMBA_PL011=y CONFIG_SERIAL_AMBA_PL011_CONSOLE=y # CONFIG_HW_RANDOM is not set diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h index 3300cbd18a89..fea9ee327206 100644 --- a/arch/arm64/include/asm/cacheflush.h +++ b/arch/arm64/include/asm/cacheflush.h @@ -123,9 +123,6 @@ static inline void __flush_icache_all(void) #define flush_dcache_mmap_unlock(mapping) \ spin_unlock_irq(&(mapping)->tree_lock) -#define flush_icache_user_range(vma,page,addr,len) \ - flush_dcache_page(page) - /* * We don't appear to need to do anything here. In fact, if we did, we'd * duplicate cache flushing elsewhere performed by flush_dcache_page(). diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h index cf2749488cd4..5fe138e0b828 100644 --- a/arch/arm64/include/asm/cputype.h +++ b/arch/arm64/include/asm/cputype.h @@ -37,11 +37,14 @@ }) #define ARM_CPU_IMP_ARM 0x41 +#define ARM_CPU_IMP_APM 0x50 #define ARM_CPU_PART_AEM_V8 0xD0F0 #define ARM_CPU_PART_FOUNDATION 0xD000 #define ARM_CPU_PART_CORTEX_A57 0xD070 +#define APM_CPU_PART_POTENZA 0x0000 + #ifndef __ASSEMBLY__ /* diff --git a/arch/arm64/include/asm/debug-monitors.h b/arch/arm64/include/asm/debug-monitors.h index 7eaa0b302493..ef8235c68c09 100644 --- a/arch/arm64/include/asm/debug-monitors.h +++ b/arch/arm64/include/asm/debug-monitors.h @@ -83,6 +83,15 @@ static inline int reinstall_suspended_bps(struct pt_regs *regs) } #endif +#ifdef CONFIG_COMPAT +int aarch32_break_handler(struct pt_regs *regs); +#else +static int aarch32_break_handler(struct pt_regs *regs) +{ + return -EFAULT; +} +#endif + #endif /* __ASSEMBLY */ #endif /* __KERNEL__ */ #endif /* __ASM_DEBUG_MONITORS_H */ diff --git a/arch/arm64/include/asm/device.h b/arch/arm64/include/asm/device.h index 0d8453c755a8..cf98b362094b 100644 --- a/arch/arm64/include/asm/device.h +++ b/arch/arm64/include/asm/device.h @@ -18,6 +18,9 @@ struct dev_archdata { struct dma_map_ops *dma_ops; +#ifdef CONFIG_IOMMU_API + void *iommu; /* private IOMMU data */ +#endif }; struct pdev_archdata { diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h index 994776894198..8d1810001aef 100644 --- a/arch/arm64/include/asm/dma-mapping.h +++ b/arch/arm64/include/asm/dma-mapping.h @@ -81,8 +81,12 @@ static inline void dma_mark_clean(void *addr, size_t size) { } -static inline void *dma_alloc_coherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flags) +#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL) +#define dma_free_coherent(d, s, h, f) dma_free_attrs(d, s, h, f, NULL) + +static inline void *dma_alloc_attrs(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t flags, + struct dma_attrs *attrs) { struct dma_map_ops *ops = get_dma_ops(dev); void *vaddr; @@ -90,13 +94,14 @@ static inline void *dma_alloc_coherent(struct device *dev, size_t size, if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr)) return vaddr; - vaddr = ops->alloc(dev, size, dma_handle, flags, NULL); + vaddr = ops->alloc(dev, size, dma_handle, flags, attrs); debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr); return vaddr; } -static inline void dma_free_coherent(struct device *dev, size_t size, - void *vaddr, dma_addr_t dev_addr) +static inline void dma_free_attrs(struct device *dev, size_t size, + void *vaddr, dma_addr_t dev_addr, + struct dma_attrs *attrs) { struct dma_map_ops *ops = get_dma_ops(dev); @@ -104,7 +109,7 @@ static inline void dma_free_coherent(struct device *dev, size_t size, return; debug_dma_free_coherent(dev, size, vaddr, dev_addr); - ops->free(dev, size, vaddr, dev_addr, NULL); + ops->free(dev, size, vaddr, dev_addr, attrs); } /* diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h new file mode 100644 index 000000000000..5b7ca8ace95f --- /dev/null +++ b/arch/arm64/include/asm/hugetlb.h @@ -0,0 +1,117 @@ +/* + * arch/arm64/include/asm/hugetlb.h + * + * Copyright (C) 2013 Linaro Ltd. + * + * Based on arch/x86/include/asm/hugetlb.h + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef __ASM_HUGETLB_H +#define __ASM_HUGETLB_H + +#include <asm-generic/hugetlb.h> +#include <asm/page.h> + +static inline pte_t huge_ptep_get(pte_t *ptep) +{ + return *ptep; +} + +static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, + pte_t *ptep, pte_t pte) +{ + set_pte_at(mm, addr, ptep, pte); +} + +static inline void huge_ptep_clear_flush(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep) +{ + ptep_clear_flush(vma, addr, ptep); +} + +static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, + unsigned long addr, pte_t *ptep) +{ + ptep_set_wrprotect(mm, addr, ptep); +} + +static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm, + unsigned long addr, pte_t *ptep) +{ + return ptep_get_and_clear(mm, addr, ptep); +} + +static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, + pte_t pte, int dirty) +{ + return ptep_set_access_flags(vma, addr, ptep, pte, dirty); +} + +static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb, + unsigned long addr, unsigned long end, + unsigned long floor, + unsigned long ceiling) +{ + free_pgd_range(tlb, addr, end, floor, ceiling); +} + +static inline int is_hugepage_only_range(struct mm_struct *mm, + unsigned long addr, unsigned long len) +{ + return 0; +} + +static inline int prepare_hugepage_range(struct file *file, + unsigned long addr, unsigned long len) +{ + struct hstate *h = hstate_file(file); + if (len & ~huge_page_mask(h)) + return -EINVAL; + if (addr & ~huge_page_mask(h)) + return -EINVAL; + return 0; +} + +static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm) +{ +} + +static inline int huge_pte_none(pte_t pte) +{ + return pte_none(pte); +} + +static inline pte_t huge_pte_wrprotect(pte_t pte) +{ + return pte_wrprotect(pte); +} + +static inline int arch_prepare_hugepage(struct page *page) +{ + return 0; +} + +static inline void arch_release_hugepage(struct page *page) +{ +} + +static inline void arch_clear_hugepage_flags(struct page *page) +{ + clear_bit(PG_dcache_clean, &page->flags); +} + +#endif /* __ASM_HUGETLB_H */ diff --git a/arch/arm64/include/asm/hypervisor.h b/arch/arm64/include/asm/hypervisor.h new file mode 100644 index 000000000000..d2c79049ff11 --- /dev/null +++ b/arch/arm64/include/asm/hypervisor.h @@ -0,0 +1,6 @@ +#ifndef _ASM_ARM64_HYPERVISOR_H +#define _ASM_ARM64_HYPERVISOR_H + +#include <asm/xen/hypervisor.h> + +#endif diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h index 2e12258aa7e4..1d12f89140ba 100644 --- a/arch/arm64/include/asm/io.h +++ b/arch/arm64/include/asm/io.h @@ -228,10 +228,12 @@ extern void __iounmap(volatile void __iomem *addr); #define PROT_DEFAULT (PTE_TYPE_PAGE | PTE_AF | PTE_DIRTY) #define PROT_DEVICE_nGnRE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_DEVICE_nGnRE)) #define PROT_NORMAL_NC (PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL_NC)) +#define PROT_NORMAL (PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL)) #define ioremap(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE)) #define ioremap_nocache(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE)) #define ioremap_wc(addr, size) __ioremap((addr), (size), __pgprot(PROT_NORMAL_NC)) +#define ioremap_cached(addr, size) __ioremap((addr), (size), __pgprot(PROT_NORMAL)) #define iounmap __iounmap #define PROT_SECT_DEFAULT (PMD_TYPE_SECT | PMD_SECT_AF) diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h new file mode 100644 index 000000000000..a5f28e2720c7 --- /dev/null +++ b/arch/arm64/include/asm/kvm_arm.h @@ -0,0 +1,245 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ARM64_KVM_ARM_H__ +#define __ARM64_KVM_ARM_H__ + +#include <asm/types.h> + +/* Hyp Configuration Register (HCR) bits */ +#define HCR_ID (UL(1) << 33) +#define HCR_CD (UL(1) << 32) +#define HCR_RW_SHIFT 31 +#define HCR_RW (UL(1) << HCR_RW_SHIFT) +#define HCR_TRVM (UL(1) << 30) +#define HCR_HCD (UL(1) << 29) +#define HCR_TDZ (UL(1) << 28) +#define HCR_TGE (UL(1) << 27) +#define HCR_TVM (UL(1) << 26) +#define HCR_TTLB (UL(1) << 25) +#define HCR_TPU (UL(1) << 24) +#define HCR_TPC (UL(1) << 23) +#define HCR_TSW (UL(1) << 22) +#define HCR_TAC (UL(1) << 21) +#define HCR_TIDCP (UL(1) << 20) +#define HCR_TSC (UL(1) << 19) +#define HCR_TID3 (UL(1) << 18) +#define HCR_TID2 (UL(1) << 17) +#define HCR_TID1 (UL(1) << 16) +#define HCR_TID0 (UL(1) << 15) +#define HCR_TWE (UL(1) << 14) +#define HCR_TWI (UL(1) << 13) +#define HCR_DC (UL(1) << 12) +#define HCR_BSU (3 << 10) +#define HCR_BSU_IS (UL(1) << 10) +#define HCR_FB (UL(1) << 9) +#define HCR_VA (UL(1) << 8) +#define HCR_VI (UL(1) << 7) +#define HCR_VF (UL(1) << 6) +#define HCR_AMO (UL(1) << 5) +#define HCR_IMO (UL(1) << 4) +#define HCR_FMO (UL(1) << 3) +#define HCR_PTW (UL(1) << 2) +#define HCR_SWIO (UL(1) << 1) +#define HCR_VM (UL(1) << 0) + +/* + * The bits we set in HCR: + * RW: 64bit by default, can be overriden for 32bit VMs + * TAC: Trap ACTLR + * TSC: Trap SMC + * TSW: Trap cache operations by set/way + * TWI: Trap WFI + * TIDCP: Trap L2CTLR/L2ECTLR + * BSU_IS: Upgrade barriers to the inner shareable domain + * FB: Force broadcast of all maintainance operations + * AMO: Override CPSR.A and enable signaling with VA + * IMO: Override CPSR.I and enable signaling with VI + * FMO: Override CPSR.F and enable signaling with VF + * SWIO: Turn set/way invalidates into set/way clean+invalidate + */ +#define HCR_GUEST_FLAGS (HCR_TSC | HCR_TSW | HCR_TWI | HCR_VM | HCR_BSU_IS | \ + HCR_FB | HCR_TAC | HCR_AMO | HCR_IMO | HCR_FMO | \ + HCR_SWIO | HCR_TIDCP | HCR_RW) +#define HCR_VIRT_EXCP_MASK (HCR_VA | HCR_VI | HCR_VF) + +/* Hyp System Control Register (SCTLR_EL2) bits */ +#define SCTLR_EL2_EE (1 << 25) +#define SCTLR_EL2_WXN (1 << 19) +#define SCTLR_EL2_I (1 << 12) +#define SCTLR_EL2_SA (1 << 3) +#define SCTLR_EL2_C (1 << 2) +#define SCTLR_EL2_A (1 << 1) +#define SCTLR_EL2_M 1 +#define SCTLR_EL2_FLAGS (SCTLR_EL2_M | SCTLR_EL2_A | SCTLR_EL2_C | \ + SCTLR_EL2_SA | SCTLR_EL2_I) + +/* TCR_EL2 Registers bits */ +#define TCR_EL2_TBI (1 << 20) +#define TCR_EL2_PS (7 << 16) +#define TCR_EL2_PS_40B (2 << 16) +#define TCR_EL2_TG0 (1 << 14) +#define TCR_EL2_SH0 (3 << 12) +#define TCR_EL2_ORGN0 (3 << 10) +#define TCR_EL2_IRGN0 (3 << 8) +#define TCR_EL2_T0SZ 0x3f +#define TCR_EL2_MASK (TCR_EL2_TG0 | TCR_EL2_SH0 | \ + TCR_EL2_ORGN0 | TCR_EL2_IRGN0 | TCR_EL2_T0SZ) + +#define TCR_EL2_FLAGS (TCR_EL2_PS_40B) + +/* VTCR_EL2 Registers bits */ +#define VTCR_EL2_PS_MASK (7 << 16) +#define VTCR_EL2_PS_40B (2 << 16) +#define VTCR_EL2_TG0_MASK (1 << 14) +#define VTCR_EL2_TG0_4K (0 << 14) +#define VTCR_EL2_TG0_64K (1 << 14) +#define VTCR_EL2_SH0_MASK (3 << 12) +#define VTCR_EL2_SH0_INNER (3 << 12) +#define VTCR_EL2_ORGN0_MASK (3 << 10) +#define VTCR_EL2_ORGN0_WBWA (1 << 10) +#define VTCR_EL2_IRGN0_MASK (3 << 8) +#define VTCR_EL2_IRGN0_WBWA (1 << 8) +#define VTCR_EL2_SL0_MASK (3 << 6) +#define VTCR_EL2_SL0_LVL1 (1 << 6) +#define VTCR_EL2_T0SZ_MASK 0x3f +#define VTCR_EL2_T0SZ_40B 24 + +#ifdef CONFIG_ARM64_64K_PAGES +/* + * Stage2 translation configuration: + * 40bits output (PS = 2) + * 40bits input (T0SZ = 24) + * 64kB pages (TG0 = 1) + * 2 level page tables (SL = 1) + */ +#define VTCR_EL2_FLAGS (VTCR_EL2_PS_40B | VTCR_EL2_TG0_64K | \ + VTCR_EL2_SH0_INNER | VTCR_EL2_ORGN0_WBWA | \ + VTCR_EL2_IRGN0_WBWA | VTCR_EL2_SL0_LVL1 | \ + VTCR_EL2_T0SZ_40B) +#define VTTBR_X (38 - VTCR_EL2_T0SZ_40B) +#else +/* + * Stage2 translation configuration: + * 40bits output (PS = 2) + * 40bits input (T0SZ = 24) + * 4kB pages (TG0 = 0) + * 3 level page tables (SL = 1) + */ +#define VTCR_EL2_FLAGS (VTCR_EL2_PS_40B | VTCR_EL2_TG0_4K | \ + VTCR_EL2_SH0_INNER | VTCR_EL2_ORGN0_WBWA | \ + VTCR_EL2_IRGN0_WBWA | VTCR_EL2_SL0_LVL1 | \ + VTCR_EL2_T0SZ_40B) +#define VTTBR_X (37 - VTCR_EL2_T0SZ_40B) +#endif + +#define VTTBR_BADDR_SHIFT (VTTBR_X - 1) +#define VTTBR_BADDR_MASK (((1LLU << (40 - VTTBR_X)) - 1) << VTTBR_BADDR_SHIFT) +#define VTTBR_VMID_SHIFT (48LLU) +#define VTTBR_VMID_MASK (0xffLLU << VTTBR_VMID_SHIFT) + +/* Hyp System Trap Register */ +#define HSTR_EL2_TTEE (1 << 16) +#define HSTR_EL2_T(x) (1 << x) + +/* Hyp Coprocessor Trap Register */ +#define CPTR_EL2_TCPAC (1 << 31) +#define CPTR_EL2_TTA (1 << 20) +#define CPTR_EL2_TFP (1 << 10) + +/* Hyp Debug Configuration Register bits */ +#define MDCR_EL2_TDRA (1 << 11) +#define MDCR_EL2_TDOSA (1 << 10) +#define MDCR_EL2_TDA (1 << 9) +#define MDCR_EL2_TDE (1 << 8) +#define MDCR_EL2_HPME (1 << 7) +#define MDCR_EL2_TPM (1 << 6) +#define MDCR_EL2_TPMCR (1 << 5) +#define MDCR_EL2_HPMN_MASK (0x1F) + +/* Exception Syndrome Register (ESR) bits */ +#define ESR_EL2_EC_SHIFT (26) +#define ESR_EL2_EC (0x3fU << ESR_EL2_EC_SHIFT) +#define ESR_EL2_IL (1U << 25) +#define ESR_EL2_ISS (ESR_EL2_IL - 1) +#define ESR_EL2_ISV_SHIFT (24) +#define ESR_EL2_ISV (1U << ESR_EL2_ISV_SHIFT) +#define ESR_EL2_SAS_SHIFT (22) +#define ESR_EL2_SAS (3U << ESR_EL2_SAS_SHIFT) +#define ESR_EL2_SSE (1 << 21) +#define ESR_EL2_SRT_SHIFT (16) +#define ESR_EL2_SRT_MASK (0x1f << ESR_EL2_SRT_SHIFT) +#define ESR_EL2_SF (1 << 15) +#define ESR_EL2_AR (1 << 14) +#define ESR_EL2_EA (1 << 9) +#define ESR_EL2_CM (1 << 8) +#define ESR_EL2_S1PTW (1 << 7) +#define ESR_EL2_WNR (1 << 6) +#define ESR_EL2_FSC (0x3f) +#define ESR_EL2_FSC_TYPE (0x3c) + +#define ESR_EL2_CV_SHIFT (24) +#define ESR_EL2_CV (1U << ESR_EL2_CV_SHIFT) +#define ESR_EL2_COND_SHIFT (20) +#define ESR_EL2_COND (0xfU << ESR_EL2_COND_SHIFT) + + +#define FSC_FAULT (0x04) +#define FSC_PERM (0x0c) + +/* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */ +#define HPFAR_MASK (~0xFUL) + +#define ESR_EL2_EC_UNKNOWN (0x00) +#define ESR_EL2_EC_WFI (0x01) +#define ESR_EL2_EC_CP15_32 (0x03) +#define ESR_EL2_EC_CP15_64 (0x04) +#define ESR_EL2_EC_CP14_MR (0x05) +#define ESR_EL2_EC_CP14_LS (0x06) +#define ESR_EL2_EC_FP_ASIMD (0x07) +#define ESR_EL2_EC_CP10_ID (0x08) +#define ESR_EL2_EC_CP14_64 (0x0C) +#define ESR_EL2_EC_ILL_ISS (0x0E) +#define ESR_EL2_EC_SVC32 (0x11) +#define ESR_EL2_EC_HVC32 (0x12) +#define ESR_EL2_EC_SMC32 (0x13) +#define ESR_EL2_EC_SVC64 (0x15) +#define ESR_EL2_EC_HVC64 (0x16) +#define ESR_EL2_EC_SMC64 (0x17) +#define ESR_EL2_EC_SYS64 (0x18) +#define ESR_EL2_EC_IABT (0x20) +#define ESR_EL2_EC_IABT_HYP (0x21) +#define ESR_EL2_EC_PC_ALIGN (0x22) +#define ESR_EL2_EC_DABT (0x24) +#define ESR_EL2_EC_DABT_HYP (0x25) +#define ESR_EL2_EC_SP_ALIGN (0x26) +#define ESR_EL2_EC_FP_EXC32 (0x28) +#define ESR_EL2_EC_FP_EXC64 (0x2C) +#define ESR_EL2_EC_SERRROR (0x2F) +#define ESR_EL2_EC_BREAKPT (0x30) +#define ESR_EL2_EC_BREAKPT_HYP (0x31) +#define ESR_EL2_EC_SOFTSTP (0x32) +#define ESR_EL2_EC_SOFTSTP_HYP (0x33) +#define ESR_EL2_EC_WATCHPT (0x34) +#define ESR_EL2_EC_WATCHPT_HYP (0x35) +#define ESR_EL2_EC_BKPT32 (0x38) +#define ESR_EL2_EC_VECTOR32 (0x3A) +#define ESR_EL2_EC_BRK64 (0x3C) + +#define ESR_EL2_EC_xABT_xFSR_EXTABT 0x10 + +#endif /* __ARM64_KVM_ARM_H__ */ diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h new file mode 100644 index 000000000000..c92de4163eba --- /dev/null +++ b/arch/arm64/include/asm/kvm_asm.h @@ -0,0 +1,104 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ARM_KVM_ASM_H__ +#define __ARM_KVM_ASM_H__ + +/* + * 0 is reserved as an invalid value. + * Order *must* be kept in sync with the hyp switch code. + */ +#define MPIDR_EL1 1 /* MultiProcessor Affinity Register */ +#define CSSELR_EL1 2 /* Cache Size Selection Register */ +#define SCTLR_EL1 3 /* System Control Register */ +#define ACTLR_EL1 4 /* Auxilliary Control Register */ +#define CPACR_EL1 5 /* Coprocessor Access Control */ +#define TTBR0_EL1 6 /* Translation Table Base Register 0 */ +#define TTBR1_EL1 7 /* Translation Table Base Register 1 */ +#define TCR_EL1 8 /* Translation Control Register */ +#define ESR_EL1 9 /* Exception Syndrome Register */ +#define AFSR0_EL1 10 /* Auxilary Fault Status Register 0 */ +#define AFSR1_EL1 11 /* Auxilary Fault Status Register 1 */ +#define FAR_EL1 12 /* Fault Address Register */ +#define MAIR_EL1 13 /* Memory Attribute Indirection Register */ +#define VBAR_EL1 14 /* Vector Base Address Register */ +#define CONTEXTIDR_EL1 15 /* Context ID Register */ +#define TPIDR_EL0 16 /* Thread ID, User R/W */ +#define TPIDRRO_EL0 17 /* Thread ID, User R/O */ +#define TPIDR_EL1 18 /* Thread ID, Privileged */ +#define AMAIR_EL1 19 /* Aux Memory Attribute Indirection Register */ +#define CNTKCTL_EL1 20 /* Timer Control Register (EL1) */ +/* 32bit specific registers. Keep them at the end of the range */ +#define DACR32_EL2 21 /* Domain Access Control Register */ +#define IFSR32_EL2 22 /* Instruction Fault Status Register */ +#define FPEXC32_EL2 23 /* Floating-Point Exception Control Register */ +#define DBGVCR32_EL2 24 /* Debug Vector Catch Register */ +#define TEECR32_EL1 25 /* ThumbEE Configuration Register */ +#define TEEHBR32_EL1 26 /* ThumbEE Handler Base Register */ +#define NR_SYS_REGS 27 + +/* 32bit mapping */ +#define c0_MPIDR (MPIDR_EL1 * 2) /* MultiProcessor ID Register */ +#define c0_CSSELR (CSSELR_EL1 * 2)/* Cache Size Selection Register */ +#define c1_SCTLR (SCTLR_EL1 * 2) /* System Control Register */ +#define c1_ACTLR (ACTLR_EL1 * 2) /* Auxiliary Control Register */ +#define c1_CPACR (CPACR_EL1 * 2) /* Coprocessor Access Control */ +#define c2_TTBR0 (TTBR0_EL1 * 2) /* Translation Table Base Register 0 */ +#define c2_TTBR0_high (c2_TTBR0 + 1) /* TTBR0 top 32 bits */ +#define c2_TTBR1 (TTBR1_EL1 * 2) /* Translation Table Base Register 1 */ +#define c2_TTBR1_high (c2_TTBR1 + 1) /* TTBR1 top 32 bits */ +#define c2_TTBCR (TCR_EL1 * 2) /* Translation Table Base Control R. */ +#define c3_DACR (DACR32_EL2 * 2)/* Domain Access Control Register */ +#define c5_DFSR (ESR_EL1 * 2) /* Data Fault Status Register */ +#define c5_IFSR (IFSR32_EL2 * 2)/* Instruction Fault Status Register */ +#define c5_ADFSR (AFSR0_EL1 * 2) /* Auxiliary Data Fault Status R */ +#define c5_AIFSR (AFSR1_EL1 * 2) /* Auxiliary Instr Fault Status R */ +#define c6_DFAR (FAR_EL1 * 2) /* Data Fault Address Register */ +#define c6_IFAR (c6_DFAR + 1) /* Instruction Fault Address Register */ +#define c10_PRRR (MAIR_EL1 * 2) /* Primary Region Remap Register */ +#define c10_NMRR (c10_PRRR + 1) /* Normal Memory Remap Register */ +#define c12_VBAR (VBAR_EL1 * 2) /* Vector Base Address Register */ +#define c13_CID (CONTEXTIDR_EL1 * 2) /* Context ID Register */ +#define c13_TID_URW (TPIDR_EL0 * 2) /* Thread ID, User R/W */ +#define c13_TID_URO (TPIDRRO_EL0 * 2)/* Thread ID, User R/O */ +#define c13_TID_PRIV (TPIDR_EL1 * 2) /* Thread ID, Privileged */ +#define c10_AMAIR (AMAIR_EL1 * 2) /* Aux Memory Attr Indirection Reg */ +#define c14_CNTKCTL (CNTKCTL_EL1 * 2) /* Timer Control Register (PL1) */ +#define NR_CP15_REGS (NR_SYS_REGS * 2) + +#define ARM_EXCEPTION_IRQ 0 +#define ARM_EXCEPTION_TRAP 1 + +#ifndef __ASSEMBLY__ +struct kvm; +struct kvm_vcpu; + +extern char __kvm_hyp_init[]; +extern char __kvm_hyp_init_end[]; + +extern char __kvm_hyp_vector[]; + +extern char __kvm_hyp_code_start[]; +extern char __kvm_hyp_code_end[]; + +extern void __kvm_flush_vm_context(void); +extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa); + +extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu); +#endif + +#endif /* __ARM_KVM_ASM_H__ */ diff --git a/arch/arm64/include/asm/kvm_coproc.h b/arch/arm64/include/asm/kvm_coproc.h new file mode 100644 index 000000000000..9a59301cd014 --- /dev/null +++ b/arch/arm64/include/asm/kvm_coproc.h @@ -0,0 +1,56 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * Derived from arch/arm/include/asm/kvm_coproc.h + * Copyright (C) 2012 Rusty Russell IBM Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ARM64_KVM_COPROC_H__ +#define __ARM64_KVM_COPROC_H__ + +#include <linux/kvm_host.h> + +void kvm_reset_sys_regs(struct kvm_vcpu *vcpu); + +struct kvm_sys_reg_table { + const struct sys_reg_desc *table; + size_t num; +}; + +struct kvm_sys_reg_target_table { + struct kvm_sys_reg_table table64; + struct kvm_sys_reg_table table32; +}; + +void kvm_register_target_sys_reg_table(unsigned int target, + struct kvm_sys_reg_target_table *table); + +int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run); +int kvm_handle_cp14_access(struct kvm_vcpu *vcpu, struct kvm_run *run); +int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run); +int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run); +int kvm_handle_sys_reg(struct kvm_vcpu *vcpu, struct kvm_run *run); + +#define kvm_coproc_table_init kvm_sys_reg_table_init +void kvm_sys_reg_table_init(void); + +struct kvm_one_reg; +int kvm_arm_copy_sys_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices); +int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *); +int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *); +unsigned long kvm_arm_num_sys_reg_descs(struct kvm_vcpu *vcpu); + +#endif /* __ARM64_KVM_COPROC_H__ */ diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h new file mode 100644 index 000000000000..eec073875218 --- /dev/null +++ b/arch/arm64/include/asm/kvm_emulate.h @@ -0,0 +1,180 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * Derived from arch/arm/include/kvm_emulate.h + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Author: Christoffer Dall <c.dall@virtualopensystems.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ARM64_KVM_EMULATE_H__ +#define __ARM64_KVM_EMULATE_H__ + +#include <linux/kvm_host.h> +#include <asm/kvm_asm.h> +#include <asm/kvm_arm.h> +#include <asm/kvm_mmio.h> +#include <asm/ptrace.h> + +unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num); +unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu); + +bool kvm_condition_valid32(const struct kvm_vcpu *vcpu); +void kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr); + +void kvm_inject_undefined(struct kvm_vcpu *vcpu); +void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr); +void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr); + +static inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu) +{ + return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pc; +} + +static inline unsigned long *vcpu_elr_el1(const struct kvm_vcpu *vcpu) +{ + return (unsigned long *)&vcpu_gp_regs(vcpu)->elr_el1; +} + +static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu) +{ + return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pstate; +} + +static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu) +{ + return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT); +} + +static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu) +{ + if (vcpu_mode_is_32bit(vcpu)) + return kvm_condition_valid32(vcpu); + + return true; +} + +static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr) +{ + if (vcpu_mode_is_32bit(vcpu)) + kvm_skip_instr32(vcpu, is_wide_instr); + else + *vcpu_pc(vcpu) += 4; +} + +static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu) +{ + *vcpu_cpsr(vcpu) |= COMPAT_PSR_T_BIT; +} + +static inline unsigned long *vcpu_reg(const struct kvm_vcpu *vcpu, u8 reg_num) +{ + if (vcpu_mode_is_32bit(vcpu)) + return vcpu_reg32(vcpu, reg_num); + + return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.regs[reg_num]; +} + +/* Get vcpu SPSR for current mode */ +static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu) +{ + if (vcpu_mode_is_32bit(vcpu)) + return vcpu_spsr32(vcpu); + + return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1]; +} + +static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu) +{ + u32 mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK; + + if (vcpu_mode_is_32bit(vcpu)) + return mode > COMPAT_PSR_MODE_USR; + + return mode != PSR_MODE_EL0t; +} + +static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu) +{ + return vcpu->arch.fault.esr_el2; +} + +static inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu) +{ + return vcpu->arch.fault.far_el2; +} + +static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu) +{ + return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8; +} + +static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu) +{ + return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_ISV); +} + +static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu) +{ + return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_WNR); +} + +static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu) +{ + return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_SSE); +} + +static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu) +{ + return (kvm_vcpu_get_hsr(vcpu) & ESR_EL2_SRT_MASK) >> ESR_EL2_SRT_SHIFT; +} + +static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu) +{ + return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_EA); +} + +static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu) +{ + return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_S1PTW); +} + +static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu) +{ + return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_EL2_SAS) >> ESR_EL2_SAS_SHIFT); +} + +/* This one is not specific to Data Abort */ +static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu) +{ + return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_IL); +} + +static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu) +{ + return kvm_vcpu_get_hsr(vcpu) >> ESR_EL2_EC_SHIFT; +} + +static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu) +{ + return kvm_vcpu_trap_get_class(vcpu) == ESR_EL2_EC_IABT; +} + +static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu) +{ + return kvm_vcpu_get_hsr(vcpu) & ESR_EL2_FSC_TYPE; +} + +#endif /* __ARM64_KVM_EMULATE_H__ */ diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h new file mode 100644 index 000000000000..644d73956864 --- /dev/null +++ b/arch/arm64/include/asm/kvm_host.h @@ -0,0 +1,202 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * Derived from arch/arm/include/asm/kvm_host.h: + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Author: Christoffer Dall <c.dall@virtualopensystems.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ARM64_KVM_HOST_H__ +#define __ARM64_KVM_HOST_H__ + +#include <asm/kvm.h> +#include <asm/kvm_asm.h> +#include <asm/kvm_mmio.h> + +#define KVM_MAX_VCPUS 4 +#define KVM_USER_MEM_SLOTS 32 +#define KVM_PRIVATE_MEM_SLOTS 4 +#define KVM_COALESCED_MMIO_PAGE_OFFSET 1 + +#include <kvm/arm_vgic.h> +#include <kvm/arm_arch_timer.h> + +#define KVM_VCPU_MAX_FEATURES 2 + +/* We don't currently support large pages. */ +#define KVM_HPAGE_GFN_SHIFT(x) 0 +#define KVM_NR_PAGE_SIZES 1 +#define KVM_PAGES_PER_HPAGE(x) (1UL<<31) + +struct kvm_vcpu; +int kvm_target_cpu(void); +int kvm_reset_vcpu(struct kvm_vcpu *vcpu); +int kvm_arch_dev_ioctl_check_extension(long ext); + +struct kvm_arch { + /* The VMID generation used for the virt. memory system */ + u64 vmid_gen; + u32 vmid; + + /* 1-level 2nd stage table and lock */ + spinlock_t pgd_lock; + pgd_t *pgd; + + /* VTTBR value associated with above pgd and vmid */ + u64 vttbr; + + /* Interrupt controller */ + struct vgic_dist vgic; + + /* Timer */ + struct arch_timer_kvm timer; +}; + +#define KVM_NR_MEM_OBJS 40 + +/* + * We don't want allocation failures within the mmu code, so we preallocate + * enough memory for a single page fault in a cache. + */ +struct kvm_mmu_memory_cache { + int nobjs; + void *objects[KVM_NR_MEM_OBJS]; +}; + +struct kvm_vcpu_fault_info { + u32 esr_el2; /* Hyp Syndrom Register */ + u64 far_el2; /* Hyp Fault Address Register */ + u64 hpfar_el2; /* Hyp IPA Fault Address Register */ +}; + +struct kvm_cpu_context { + struct kvm_regs gp_regs; + union { + u64 sys_regs[NR_SYS_REGS]; + u32 cp15[NR_CP15_REGS]; + }; +}; + +typedef struct kvm_cpu_context kvm_cpu_context_t; + +struct kvm_vcpu_arch { + struct kvm_cpu_context ctxt; + + /* HYP configuration */ + u64 hcr_el2; + + /* Exception Information */ + struct kvm_vcpu_fault_info fault; + + /* Pointer to host CPU context */ + kvm_cpu_context_t *host_cpu_context; + + /* VGIC state */ + struct vgic_cpu vgic_cpu; + struct arch_timer_cpu timer_cpu; + + /* + * Anything that is not used directly from assembly code goes + * here. + */ + /* dcache set/way operation pending */ + int last_pcpu; + cpumask_t require_dcache_flush; + + /* Don't run the guest */ + bool pause; + + /* IO related fields */ + struct kvm_decode mmio_decode; + + /* Interrupt related fields */ + u64 irq_lines; /* IRQ and FIQ levels */ + + /* Cache some mmu pages needed inside spinlock regions */ + struct kvm_mmu_memory_cache mmu_page_cache; + + /* Target CPU and feature flags */ + u32 target; + DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES); + + /* Detect first run of a vcpu */ + bool has_run_once; +}; + +#define vcpu_gp_regs(v) (&(v)->arch.ctxt.gp_regs) +#define vcpu_sys_reg(v,r) ((v)->arch.ctxt.sys_regs[(r)]) +#define vcpu_cp15(v,r) ((v)->arch.ctxt.cp15[(r)]) + +struct kvm_vm_stat { + u32 remote_tlb_flush; +}; + +struct kvm_vcpu_stat { + u32 halt_wakeup; +}; + +struct kvm_vcpu_init; +int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, + const struct kvm_vcpu_init *init); +unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu); +int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices); +struct kvm_one_reg; +int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg); +int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg); + +#define KVM_ARCH_WANT_MMU_NOTIFIER +struct kvm; +int kvm_unmap_hva(struct kvm *kvm, unsigned long hva); +int kvm_unmap_hva_range(struct kvm *kvm, + unsigned long start, unsigned long end); +void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte); + +/* We do not have shadow page tables, hence the empty hooks */ +static inline int kvm_age_hva(struct kvm *kvm, unsigned long hva) +{ + return 0; +} + +static inline int kvm_test_age_hva(struct kvm *kvm, unsigned long hva) +{ + return 0; +} + +struct kvm_vcpu *kvm_arm_get_running_vcpu(void); +struct kvm_vcpu __percpu **kvm_get_running_vcpus(void); + +u64 kvm_call_hyp(void *hypfn, ...); + +int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, + int exception_index); + +int kvm_perf_init(void); +int kvm_perf_teardown(void); + +static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr, + phys_addr_t pgd_ptr, + unsigned long hyp_stack_ptr, + unsigned long vector_ptr) +{ + /* + * Call initialization code, and switch to the full blown + * HYP code. + */ + kvm_call_hyp((void *)boot_pgd_ptr, pgd_ptr, + hyp_stack_ptr, vector_ptr); +} + +#endif /* __ARM64_KVM_HOST_H__ */ diff --git a/arch/arm64/include/asm/kvm_mmio.h b/arch/arm64/include/asm/kvm_mmio.h new file mode 100644 index 000000000000..fc2f689c0694 --- /dev/null +++ b/arch/arm64/include/asm/kvm_mmio.h @@ -0,0 +1,59 @@ +/* + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Author: Christoffer Dall <c.dall@virtualopensystems.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ARM64_KVM_MMIO_H__ +#define __ARM64_KVM_MMIO_H__ + +#include <linux/kvm_host.h> +#include <asm/kvm_asm.h> +#include <asm/kvm_arm.h> + +/* + * This is annoying. The mmio code requires this, even if we don't + * need any decoding. To be fixed. + */ +struct kvm_decode { + unsigned long rt; + bool sign_extend; +}; + +/* + * The in-kernel MMIO emulation code wants to use a copy of run->mmio, + * which is an anonymous type. Use our own type instead. + */ +struct kvm_exit_mmio { + phys_addr_t phys_addr; + u8 data[8]; + u32 len; + bool is_write; +}; + +static inline void kvm_prepare_mmio(struct kvm_run *run, + struct kvm_exit_mmio *mmio) +{ + run->mmio.phys_addr = mmio->phys_addr; + run->mmio.len = mmio->len; + run->mmio.is_write = mmio->is_write; + memcpy(run->mmio.data, mmio->data, mmio->len); + run->exit_reason = KVM_EXIT_MMIO; +} + +int kvm_handle_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run); +int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run, + phys_addr_t fault_ipa); + +#endif /* __ARM64_KVM_MMIO_H__ */ diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h new file mode 100644 index 000000000000..efe609c6a3c9 --- /dev/null +++ b/arch/arm64/include/asm/kvm_mmu.h @@ -0,0 +1,135 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ARM64_KVM_MMU_H__ +#define __ARM64_KVM_MMU_H__ + +#include <asm/page.h> +#include <asm/memory.h> + +/* + * As we only have the TTBR0_EL2 register, we cannot express + * "negative" addresses. This makes it impossible to directly share + * mappings with the kernel. + * + * Instead, give the HYP mode its own VA region at a fixed offset from + * the kernel by just masking the top bits (which are all ones for a + * kernel address). + */ +#define HYP_PAGE_OFFSET_SHIFT VA_BITS +#define HYP_PAGE_OFFSET_MASK ((UL(1) << HYP_PAGE_OFFSET_SHIFT) - 1) +#define HYP_PAGE_OFFSET (PAGE_OFFSET & HYP_PAGE_OFFSET_MASK) + +/* + * Our virtual mapping for the idmap-ed MMU-enable code. Must be + * shared across all the page-tables. Conveniently, we use the last + * possible page, where no kernel mapping will ever exist. + */ +#define TRAMPOLINE_VA (HYP_PAGE_OFFSET_MASK & PAGE_MASK) + +#ifdef __ASSEMBLY__ + +/* + * Convert a kernel VA into a HYP VA. + * reg: VA to be converted. + */ +.macro kern_hyp_va reg + and \reg, \reg, #HYP_PAGE_OFFSET_MASK +.endm + +#else + +#include <asm/cachetype.h> +#include <asm/cacheflush.h> + +#define KERN_TO_HYP(kva) ((unsigned long)kva - PAGE_OFFSET + HYP_PAGE_OFFSET) + +/* + * Align KVM with the kernel's view of physical memory. Should be + * 40bit IPA, with PGD being 8kB aligned in the 4KB page configuration. + */ +#define KVM_PHYS_SHIFT PHYS_MASK_SHIFT +#define KVM_PHYS_SIZE (1UL << KVM_PHYS_SHIFT) +#define KVM_PHYS_MASK (KVM_PHYS_SIZE - 1UL) + +/* Make sure we get the right size, and thus the right alignment */ +#define PTRS_PER_S2_PGD (1 << (KVM_PHYS_SHIFT - PGDIR_SHIFT)) +#define S2_PGD_ORDER get_order(PTRS_PER_S2_PGD * sizeof(pgd_t)) + +int create_hyp_mappings(void *from, void *to); +int create_hyp_io_mappings(void *from, void *to, phys_addr_t); +void free_boot_hyp_pgd(void); +void free_hyp_pgds(void); + +int kvm_alloc_stage2_pgd(struct kvm *kvm); +void kvm_free_stage2_pgd(struct kvm *kvm); +int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa, + phys_addr_t pa, unsigned long size); + +int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run); + +void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu); + +phys_addr_t kvm_mmu_get_httbr(void); +phys_addr_t kvm_mmu_get_boot_httbr(void); +phys_addr_t kvm_get_idmap_vector(void); +int kvm_mmu_init(void); +void kvm_clear_hyp_idmap(void); + +#define kvm_set_pte(ptep, pte) set_pte(ptep, pte) + +static inline bool kvm_is_write_fault(unsigned long esr) +{ + unsigned long esr_ec = esr >> ESR_EL2_EC_SHIFT; + + if (esr_ec == ESR_EL2_EC_IABT) + return false; + + if ((esr & ESR_EL2_ISV) && !(esr & ESR_EL2_WNR)) + return false; + + return true; +} + +static inline void kvm_clean_dcache_area(void *addr, size_t size) {} +static inline void kvm_clean_pgd(pgd_t *pgd) {} +static inline void kvm_clean_pmd_entry(pmd_t *pmd) {} +static inline void kvm_clean_pte(pte_t *pte) {} +static inline void kvm_clean_pte_entry(pte_t *pte) {} + +static inline void kvm_set_s2pte_writable(pte_t *pte) +{ + pte_val(*pte) |= PTE_S2_RDWR; +} + +struct kvm; + +static inline void coherent_icache_guest_page(struct kvm *kvm, gfn_t gfn) +{ + if (!icache_is_aliasing()) { /* PIPT */ + unsigned long hva = gfn_to_hva(kvm, gfn); + flush_icache_range(hva, hva + PAGE_SIZE); + } else if (!icache_is_aivivt()) { /* non ASID-tagged VIVT */ + /* any kind of VIPT cache */ + __flush_icache_all(); + } +} + +#define kvm_flush_dcache_to_poc(a,l) __flush_dcache_area((a), (l)) + +#endif /* __ASSEMBLY__ */ +#endif /* __ARM64_KVM_MMU_H__ */ diff --git a/arch/arm64/include/asm/kvm_psci.h b/arch/arm64/include/asm/kvm_psci.h new file mode 100644 index 000000000000..e301a4816355 --- /dev/null +++ b/arch/arm64/include/asm/kvm_psci.h @@ -0,0 +1,23 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ARM64_KVM_PSCI_H__ +#define __ARM64_KVM_PSCI_H__ + +bool kvm_psci_call(struct kvm_vcpu *vcpu); + +#endif /* __ARM64_KVM_PSCI_H__ */ diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index 381f556b664e..20925bcf4e2a 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -90,6 +90,12 @@ #define MT_NORMAL_NC 3 #define MT_NORMAL 4 +/* + * Memory types for Stage-2 translation + */ +#define MT_S2_NORMAL 0xf +#define MT_S2_DEVICE_nGnRE 0x1 + #ifndef __ASSEMBLY__ extern phys_addr_t memstart_addr; diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h index e2bc385adb6b..a9eee33dfa62 100644 --- a/arch/arm64/include/asm/mmu_context.h +++ b/arch/arm64/include/asm/mmu_context.h @@ -151,12 +151,6 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next, { unsigned int cpu = smp_processor_id(); -#ifdef CONFIG_SMP - /* check for possible thread migration */ - if (!cpumask_empty(mm_cpumask(next)) && - !cpumask_test_cpu(cpu, mm_cpumask(next))) - __flush_icache_all(); -#endif if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)) || prev != next) check_and_switch_context(next, tsk); } diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h index 75fd13d289b9..e182a356c979 100644 --- a/arch/arm64/include/asm/pgtable-hwdef.h +++ b/arch/arm64/include/asm/pgtable-hwdef.h @@ -25,16 +25,27 @@ /* * Hardware page table definitions. * + * Level 1 descriptor (PUD). + */ + +#define PUD_TABLE_BIT (_AT(pgdval_t, 1) << 1) + +/* * Level 2 descriptor (PMD). */ #define PMD_TYPE_MASK (_AT(pmdval_t, 3) << 0) #define PMD_TYPE_FAULT (_AT(pmdval_t, 0) << 0) #define PMD_TYPE_TABLE (_AT(pmdval_t, 3) << 0) #define PMD_TYPE_SECT (_AT(pmdval_t, 1) << 0) +#define PMD_TABLE_BIT (_AT(pmdval_t, 1) << 1) /* * Section */ +#define PMD_SECT_VALID (_AT(pmdval_t, 1) << 0) +#define PMD_SECT_PROT_NONE (_AT(pmdval_t, 1) << 2) +#define PMD_SECT_USER (_AT(pmdval_t, 1) << 6) /* AP[1] */ +#define PMD_SECT_RDONLY (_AT(pmdval_t, 1) << 7) /* AP[2] */ #define PMD_SECT_S (_AT(pmdval_t, 3) << 8) #define PMD_SECT_AF (_AT(pmdval_t, 1) << 10) #define PMD_SECT_NG (_AT(pmdval_t, 1) << 11) @@ -53,6 +64,7 @@ #define PTE_TYPE_MASK (_AT(pteval_t, 3) << 0) #define PTE_TYPE_FAULT (_AT(pteval_t, 0) << 0) #define PTE_TYPE_PAGE (_AT(pteval_t, 3) << 0) +#define PTE_TABLE_BIT (_AT(pteval_t, 1) << 1) #define PTE_USER (_AT(pteval_t, 1) << 6) /* AP[1] */ #define PTE_RDONLY (_AT(pteval_t, 1) << 7) /* AP[2] */ #define PTE_SHARED (_AT(pteval_t, 3) << 8) /* SH[1:0], inner shareable */ @@ -68,6 +80,24 @@ #define PTE_ATTRINDX_MASK (_AT(pteval_t, 7) << 2) /* + * 2nd stage PTE definitions + */ +#define PTE_S2_RDONLY (_AT(pteval_t, 1) << 6) /* HAP[2:1] */ +#define PTE_S2_RDWR (_AT(pteval_t, 3) << 6) /* HAP[2:1] */ + +/* + * Memory Attribute override for Stage-2 (MemAttr[3:0]) + */ +#define PTE_S2_MEMATTR(t) (_AT(pteval_t, (t)) << 2) +#define PTE_S2_MEMATTR_MASK (_AT(pteval_t, 0xf) << 2) + +/* + * EL2/HYP PTE/PMD definitions + */ +#define PMD_HYP PMD_SECT_USER +#define PTE_HYP PTE_USER + +/* * 40-bit physical address supported. */ #define PHYS_MASK_SHIFT (40) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 3a768e96cf0e..f0bebc5e22cd 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -25,8 +25,8 @@ * Software defined PTE bits definition. */ #define PTE_VALID (_AT(pteval_t, 1) << 0) -#define PTE_PROT_NONE (_AT(pteval_t, 1) << 1) /* only when !PTE_VALID */ -#define PTE_FILE (_AT(pteval_t, 1) << 2) /* only when !pte_present() */ +#define PTE_PROT_NONE (_AT(pteval_t, 1) << 2) /* only when !PTE_VALID */ +#define PTE_FILE (_AT(pteval_t, 1) << 3) /* only when !pte_present() */ #define PTE_DIRTY (_AT(pteval_t, 1) << 55) #define PTE_SPECIAL (_AT(pteval_t, 1) << 56) @@ -66,7 +66,7 @@ extern pgprot_t pgprot_default; #define _MOD_PROT(p, b) __pgprot_modify(p, 0, b) -#define PAGE_NONE __pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE) +#define PAGE_NONE __pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE | PTE_RDONLY | PTE_PXN | PTE_UXN) #define PAGE_SHARED _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) #define PAGE_SHARED_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN) #define PAGE_COPY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) @@ -76,7 +76,13 @@ extern pgprot_t pgprot_default; #define PAGE_KERNEL _MOD_PROT(pgprot_default, PTE_PXN | PTE_UXN | PTE_DIRTY) #define PAGE_KERNEL_EXEC _MOD_PROT(pgprot_default, PTE_UXN | PTE_DIRTY) -#define __PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE) +#define PAGE_HYP _MOD_PROT(pgprot_default, PTE_HYP) +#define PAGE_HYP_DEVICE __pgprot(PROT_DEVICE_nGnRE | PTE_HYP) + +#define PAGE_S2 __pgprot_modify(pgprot_default, PTE_S2_MEMATTR_MASK, PTE_S2_MEMATTR(MT_S2_NORMAL) | PTE_S2_RDONLY) +#define PAGE_S2_DEVICE __pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_DEVICE_nGnRE) | PTE_S2_RDWR | PTE_UXN) + +#define __PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE | PTE_RDONLY | PTE_PXN | PTE_UXN) #define __PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) #define __PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN) #define __PAGE_COPY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) @@ -119,7 +125,7 @@ extern struct page *empty_zero_page; #define pte_none(pte) (!pte_val(pte)) #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0)) #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) -#define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr)) +#define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + pte_index(addr)) #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr)) #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr)) @@ -173,12 +179,76 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, /* * Huge pte definitions. */ -#define pte_huge(pte) ((pte_val(pte) & PTE_TYPE_MASK) == PTE_TYPE_HUGEPAGE) -#define pte_mkhuge(pte) (__pte((pte_val(pte) & ~PTE_TYPE_MASK) | PTE_TYPE_HUGEPAGE)) +#define pte_huge(pte) (!(pte_val(pte) & PTE_TABLE_BIT)) +#define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT)) + +/* + * Hugetlb definitions. + */ +#define HUGE_MAX_HSTATE 2 +#define HPAGE_SHIFT PMD_SHIFT +#define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) +#define HPAGE_MASK (~(HPAGE_SIZE - 1)) +#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) #define __HAVE_ARCH_PTE_SPECIAL /* + * Software PMD bits for THP + */ + +#define PMD_SECT_DIRTY (_AT(pmdval_t, 1) << 55) +#define PMD_SECT_SPLITTING (_AT(pmdval_t, 1) << 57) + +/* + * THP definitions. + */ +#define pmd_young(pmd) (pmd_val(pmd) & PMD_SECT_AF) + +#define __HAVE_ARCH_PMD_WRITE +#define pmd_write(pmd) (!(pmd_val(pmd) & PMD_SECT_RDONLY)) + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +#define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT)) +#define pmd_trans_splitting(pmd) (pmd_val(pmd) & PMD_SECT_SPLITTING) +#endif + +#define PMD_BIT_FUNC(fn,op) \ +static inline pmd_t pmd_##fn(pmd_t pmd) { pmd_val(pmd) op; return pmd; } + +PMD_BIT_FUNC(wrprotect, |= PMD_SECT_RDONLY); +PMD_BIT_FUNC(mkold, &= ~PMD_SECT_AF); +PMD_BIT_FUNC(mksplitting, |= PMD_SECT_SPLITTING); +PMD_BIT_FUNC(mkwrite, &= ~PMD_SECT_RDONLY); +PMD_BIT_FUNC(mkdirty, |= PMD_SECT_DIRTY); +PMD_BIT_FUNC(mkyoung, |= PMD_SECT_AF); +PMD_BIT_FUNC(mknotpresent, &= ~PMD_TYPE_MASK); + +#define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT)) + +#define pmd_pfn(pmd) (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT) +#define pfn_pmd(pfn,prot) (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) +#define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) + +#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) + +static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) +{ + const pmdval_t mask = PMD_SECT_USER | PMD_SECT_PXN | PMD_SECT_UXN | + PMD_SECT_RDONLY | PMD_SECT_PROT_NONE | + PMD_SECT_VALID; + pmd_val(pmd) = (pmd_val(pmd) & ~mask) | (pgprot_val(newprot) & mask); + return pmd; +} + +#define set_pmd_at(mm, addr, pmdp, pmd) set_pmd(pmdp, pmd) + +static inline int has_transparent_hugepage(void) +{ + return 1; +} + +/* * Mark the prot value as uncacheable and unbufferable. */ #define pgprot_noncached(prot) \ @@ -197,6 +267,12 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, #define pmd_bad(pmd) (!(pmd_val(pmd) & 2)) +#define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ + PMD_TYPE_TABLE) +#define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ + PMD_TYPE_SECT) + + static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) { *pmdp = pmd; @@ -263,7 +339,7 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) #endif /* Find an entry in the third-level page table.. */ -#define __pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) +#define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { @@ -281,12 +357,12 @@ extern pgd_t idmap_pg_dir[PTRS_PER_PGD]; /* * Encode and decode a swap entry: - * bits 0-1: present (must be zero) - * bit 2: PTE_FILE - * bits 3-8: swap type + * bits 0, 2: present (must both be zero) + * bit 3: PTE_FILE + * bits 4-8: swap type * bits 9-63: swap offset */ -#define __SWP_TYPE_SHIFT 3 +#define __SWP_TYPE_SHIFT 4 #define __SWP_TYPE_BITS 6 #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) @@ -306,15 +382,15 @@ extern pgd_t idmap_pg_dir[PTRS_PER_PGD]; /* * Encode and decode a file entry: - * bits 0-1: present (must be zero) - * bit 2: PTE_FILE - * bits 3-63: file offset / PAGE_SIZE + * bits 0, 2: present (must both be zero) + * bit 3: PTE_FILE + * bits 4-63: file offset / PAGE_SIZE */ #define pte_file(pte) (pte_val(pte) & PTE_FILE) -#define pte_to_pgoff(x) (pte_val(x) >> 3) -#define pgoff_to_pte(x) __pte(((x) << 3) | PTE_FILE) +#define pte_to_pgoff(x) (pte_val(x) >> 4) +#define pgoff_to_pte(x) __pte(((x) << 4) | PTE_FILE) -#define PTE_FILE_MAX_BITS 61 +#define PTE_FILE_MAX_BITS 60 extern int kern_addr_valid(unsigned long addr); diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h index 41a71ee4c3df..0dacbbf9458b 100644 --- a/arch/arm64/include/asm/ptrace.h +++ b/arch/arm64/include/asm/ptrace.h @@ -171,7 +171,5 @@ extern unsigned long profile_pc(struct pt_regs *regs); #define profile_pc(regs) instruction_pointer(regs) #endif -extern int aarch32_break_trap(struct pt_regs *regs); - #endif /* __ASSEMBLY__ */ #endif diff --git a/arch/arm64/include/asm/spinlock.h b/arch/arm64/include/asm/spinlock.h index 7065e920149d..0defa0728a9b 100644 --- a/arch/arm64/include/asm/spinlock.h +++ b/arch/arm64/include/asm/spinlock.h @@ -59,9 +59,10 @@ static inline int arch_spin_trylock(arch_spinlock_t *lock) unsigned int tmp; asm volatile( - " ldaxr %w0, %1\n" + "2: ldaxr %w0, %1\n" " cbnz %w0, 1f\n" " stxr %w0, %w2, %1\n" + " cbnz %w0, 2b\n" "1:\n" : "=&r" (tmp), "+Q" (lock->lock) : "r" (1) diff --git a/arch/arm64/include/asm/sync_bitops.h b/arch/arm64/include/asm/sync_bitops.h new file mode 100644 index 000000000000..8da0bf4f7659 --- /dev/null +++ b/arch/arm64/include/asm/sync_bitops.h @@ -0,0 +1,26 @@ +#ifndef __ASM_SYNC_BITOPS_H__ +#define __ASM_SYNC_BITOPS_H__ + +#include <asm/bitops.h> +#include <asm/cmpxchg.h> + +/* sync_bitops functions are equivalent to the SMP implementation of the + * original functions, independently from CONFIG_SMP being defined. + * + * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But + * under Xen you might be communicating with a completely external entity + * who might be on another CPU (e.g. two uniprocessor guests communicating + * via event channels and grant tables). So we need a variant of the bit + * ops which are SMP safe even on a UP kernel. + */ + +#define sync_set_bit(nr, p) set_bit(nr, p) +#define sync_clear_bit(nr, p) clear_bit(nr, p) +#define sync_change_bit(nr, p) change_bit(nr, p) +#define sync_test_and_set_bit(nr, p) test_and_set_bit(nr, p) +#define sync_test_and_clear_bit(nr, p) test_and_clear_bit(nr, p) +#define sync_test_and_change_bit(nr, p) test_and_change_bit(nr, p) +#define sync_test_bit(nr, addr) test_bit(nr, addr) +#define sync_cmpxchg cmpxchg + +#endif diff --git a/arch/arm64/include/asm/timex.h b/arch/arm64/include/asm/timex.h index b24a31a7e2c9..81a076eb37fa 100644 --- a/arch/arm64/include/asm/timex.h +++ b/arch/arm64/include/asm/timex.h @@ -16,14 +16,14 @@ #ifndef __ASM_TIMEX_H #define __ASM_TIMEX_H +#include <asm/arch_timer.h> + /* * Use the current timer as a cycle counter since this is what we use for * the delay loop. */ -#define get_cycles() ({ cycles_t c; read_current_timer(&c); c; }) +#define get_cycles() arch_counter_get_cntvct() #include <asm-generic/timex.h> -#define ARCH_HAS_READ_CURRENT_TIMER - #endif diff --git a/arch/arm64/include/asm/tlb.h b/arch/arm64/include/asm/tlb.h index 654f0968030b..46b3beb4b773 100644 --- a/arch/arm64/include/asm/tlb.h +++ b/arch/arm64/include/asm/tlb.h @@ -187,4 +187,10 @@ static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp, #define tlb_migrate_finish(mm) do { } while (0) +static inline void +tlb_remove_pmd_tlb_entry(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr) +{ + tlb_add_flush(tlb, addr); +} + #endif diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h index 122d6320f745..8b482035cfc2 100644 --- a/arch/arm64/include/asm/tlbflush.h +++ b/arch/arm64/include/asm/tlbflush.h @@ -117,6 +117,8 @@ static inline void update_mmu_cache(struct vm_area_struct *vma, dsb(); } +#define update_mmu_cache_pmd(vma, address, pmd) do { } while (0) + #endif #endif diff --git a/arch/arm64/include/asm/xen/events.h b/arch/arm64/include/asm/xen/events.h new file mode 100644 index 000000000000..86553213c132 --- /dev/null +++ b/arch/arm64/include/asm/xen/events.h @@ -0,0 +1,21 @@ +#ifndef _ASM_ARM64_XEN_EVENTS_H +#define _ASM_ARM64_XEN_EVENTS_H + +#include <asm/ptrace.h> +#include <asm/atomic.h> + +enum ipi_vector { + XEN_PLACEHOLDER_VECTOR, + + /* Xen IPIs go here */ + XEN_NR_IPIS, +}; + +static inline int xen_irqs_disabled(struct pt_regs *regs) +{ + return raw_irqs_disabled_flags((unsigned long) regs->pstate); +} + +#define xchg_xen_ulong(ptr, val) xchg((ptr), (val)) + +#endif /* _ASM_ARM64_XEN_EVENTS_H */ diff --git a/arch/arm64/include/asm/xen/hypercall.h b/arch/arm64/include/asm/xen/hypercall.h new file mode 100644 index 000000000000..74b0c423ff5b --- /dev/null +++ b/arch/arm64/include/asm/xen/hypercall.h @@ -0,0 +1 @@ +#include <../../arm/include/asm/xen/hypercall.h> diff --git a/arch/arm64/include/asm/xen/hypervisor.h b/arch/arm64/include/asm/xen/hypervisor.h new file mode 100644 index 000000000000..f263da8e8769 --- /dev/null +++ b/arch/arm64/include/asm/xen/hypervisor.h @@ -0,0 +1 @@ +#include <../../arm/include/asm/xen/hypervisor.h> diff --git a/arch/arm64/include/asm/xen/interface.h b/arch/arm64/include/asm/xen/interface.h new file mode 100644 index 000000000000..44457aebeed4 --- /dev/null +++ b/arch/arm64/include/asm/xen/interface.h @@ -0,0 +1 @@ +#include <../../arm/include/asm/xen/interface.h> diff --git a/arch/arm64/include/asm/xen/page.h b/arch/arm64/include/asm/xen/page.h new file mode 100644 index 000000000000..bed87ec36780 --- /dev/null +++ b/arch/arm64/include/asm/xen/page.h @@ -0,0 +1 @@ +#include <../../arm/include/asm/xen/page.h> diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h new file mode 100644 index 000000000000..5031f4263937 --- /dev/null +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -0,0 +1,168 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * Derived from arch/arm/include/uapi/asm/kvm.h: + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Author: Christoffer Dall <c.dall@virtualopensystems.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ARM_KVM_H__ +#define __ARM_KVM_H__ + +#define KVM_SPSR_EL1 0 +#define KVM_SPSR_SVC KVM_SPSR_EL1 +#define KVM_SPSR_ABT 1 +#define KVM_SPSR_UND 2 +#define KVM_SPSR_IRQ 3 +#define KVM_SPSR_FIQ 4 +#define KVM_NR_SPSR 5 + +#ifndef __ASSEMBLY__ +#include <asm/types.h> +#include <asm/ptrace.h> + +#define __KVM_HAVE_GUEST_DEBUG +#define __KVM_HAVE_IRQ_LINE + +#define KVM_REG_SIZE(id) \ + (1U << (((id) & KVM_REG_SIZE_MASK) >> KVM_REG_SIZE_SHIFT)) + +struct kvm_regs { + struct user_pt_regs regs; /* sp = sp_el0 */ + + __u64 sp_el1; + __u64 elr_el1; + + __u64 spsr[KVM_NR_SPSR]; + + struct user_fpsimd_state fp_regs; +}; + +/* Supported Processor Types */ +#define KVM_ARM_TARGET_AEM_V8 0 +#define KVM_ARM_TARGET_FOUNDATION_V8 1 +#define KVM_ARM_TARGET_CORTEX_A57 2 + +#define KVM_ARM_NUM_TARGETS 3 + +/* KVM_ARM_SET_DEVICE_ADDR ioctl id encoding */ +#define KVM_ARM_DEVICE_TYPE_SHIFT 0 +#define KVM_ARM_DEVICE_TYPE_MASK (0xffff << KVM_ARM_DEVICE_TYPE_SHIFT) +#define KVM_ARM_DEVICE_ID_SHIFT 16 +#define KVM_ARM_DEVICE_ID_MASK (0xffff << KVM_ARM_DEVICE_ID_SHIFT) + +/* Supported device IDs */ +#define KVM_ARM_DEVICE_VGIC_V2 0 + +/* Supported VGIC address types */ +#define KVM_VGIC_V2_ADDR_TYPE_DIST 0 +#define KVM_VGIC_V2_ADDR_TYPE_CPU 1 + +#define KVM_VGIC_V2_DIST_SIZE 0x1000 +#define KVM_VGIC_V2_CPU_SIZE 0x2000 + +#define KVM_ARM_VCPU_POWER_OFF 0 /* CPU is started in OFF state */ +#define KVM_ARM_VCPU_EL1_32BIT 1 /* CPU running a 32bit VM */ + +struct kvm_vcpu_init { + __u32 target; + __u32 features[7]; +}; + +struct kvm_sregs { +}; + +struct kvm_fpu { +}; + +struct kvm_guest_debug_arch { +}; + +struct kvm_debug_exit_arch { +}; + +struct kvm_sync_regs { +}; + +struct kvm_arch_memory_slot { +}; + +/* If you need to interpret the index values, here is the key: */ +#define KVM_REG_ARM_COPROC_MASK 0x000000000FFF0000 +#define KVM_REG_ARM_COPROC_SHIFT 16 + +/* Normal registers are mapped as coprocessor 16. */ +#define KVM_REG_ARM_CORE (0x0010 << KVM_REG_ARM_COPROC_SHIFT) +#define KVM_REG_ARM_CORE_REG(name) (offsetof(struct kvm_regs, name) / sizeof(__u32)) + +/* Some registers need more space to represent values. */ +#define KVM_REG_ARM_DEMUX (0x0011 << KVM_REG_ARM_COPROC_SHIFT) +#define KVM_REG_ARM_DEMUX_ID_MASK 0x000000000000FF00 +#define KVM_REG_ARM_DEMUX_ID_SHIFT 8 +#define KVM_REG_ARM_DEMUX_ID_CCSIDR (0x00 << KVM_REG_ARM_DEMUX_ID_SHIFT) +#define KVM_REG_ARM_DEMUX_VAL_MASK 0x00000000000000FF +#define KVM_REG_ARM_DEMUX_VAL_SHIFT 0 + +/* AArch64 system registers */ +#define KVM_REG_ARM64_SYSREG (0x0013 << KVM_REG_ARM_COPROC_SHIFT) +#define KVM_REG_ARM64_SYSREG_OP0_MASK 0x000000000000c000 +#define KVM_REG_ARM64_SYSREG_OP0_SHIFT 14 +#define KVM_REG_ARM64_SYSREG_OP1_MASK 0x0000000000003800 +#define KVM_REG_ARM64_SYSREG_OP1_SHIFT 11 +#define KVM_REG_ARM64_SYSREG_CRN_MASK 0x0000000000000780 +#define KVM_REG_ARM64_SYSREG_CRN_SHIFT 7 +#define KVM_REG_ARM64_SYSREG_CRM_MASK 0x0000000000000078 +#define KVM_REG_ARM64_SYSREG_CRM_SHIFT 3 +#define KVM_REG_ARM64_SYSREG_OP2_MASK 0x0000000000000007 +#define KVM_REG_ARM64_SYSREG_OP2_SHIFT 0 + +/* KVM_IRQ_LINE irq field index values */ +#define KVM_ARM_IRQ_TYPE_SHIFT 24 +#define KVM_ARM_IRQ_TYPE_MASK 0xff +#define KVM_ARM_IRQ_VCPU_SHIFT 16 +#define KVM_ARM_IRQ_VCPU_MASK 0xff +#define KVM_ARM_IRQ_NUM_SHIFT 0 +#define KVM_ARM_IRQ_NUM_MASK 0xffff + +/* irq_type field */ +#define KVM_ARM_IRQ_TYPE_CPU 0 +#define KVM_ARM_IRQ_TYPE_SPI 1 +#define KVM_ARM_IRQ_TYPE_PPI 2 + +/* out-of-kernel GIC cpu interrupt injection irq_number field */ +#define KVM_ARM_IRQ_CPU_IRQ 0 +#define KVM_ARM_IRQ_CPU_FIQ 1 + +/* Highest supported SPI, from VGIC_NR_IRQS */ +#define KVM_ARM_IRQ_GIC_MAX 127 + +/* PSCI interface */ +#define KVM_PSCI_FN_BASE 0x95c1ba5e +#define KVM_PSCI_FN(n) (KVM_PSCI_FN_BASE + (n)) + +#define KVM_PSCI_FN_CPU_SUSPEND KVM_PSCI_FN(0) +#define KVM_PSCI_FN_CPU_OFF KVM_PSCI_FN(1) +#define KVM_PSCI_FN_CPU_ON KVM_PSCI_FN(2) +#define KVM_PSCI_FN_MIGRATE KVM_PSCI_FN(3) + +#define KVM_PSCI_RET_SUCCESS 0 +#define KVM_PSCI_RET_NI ((unsigned long)-1) +#define KVM_PSCI_RET_INVAL ((unsigned long)-2) +#define KVM_PSCI_RET_DENIED ((unsigned long)-3) + +#endif + +#endif /* __ARM_KVM_H__ */ diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c index a2a4d810bea3..49c162c03b69 100644 --- a/arch/arm64/kernel/asm-offsets.c +++ b/arch/arm64/kernel/asm-offsets.c @@ -104,5 +104,38 @@ int main(void) BLANK(); DEFINE(TZ_MINWEST, offsetof(struct timezone, tz_minuteswest)); DEFINE(TZ_DSTTIME, offsetof(struct timezone, tz_dsttime)); + BLANK(); +#ifdef CONFIG_KVM_ARM_HOST + DEFINE(VCPU_CONTEXT, offsetof(struct kvm_vcpu, arch.ctxt)); + DEFINE(CPU_GP_REGS, offsetof(struct kvm_cpu_context, gp_regs)); + DEFINE(CPU_USER_PT_REGS, offsetof(struct kvm_regs, regs)); + DEFINE(CPU_FP_REGS, offsetof(struct kvm_regs, fp_regs)); + DEFINE(CPU_SP_EL1, offsetof(struct kvm_regs, sp_el1)); + DEFINE(CPU_ELR_EL1, offsetof(struct kvm_regs, elr_el1)); + DEFINE(CPU_SPSR, offsetof(struct kvm_regs, spsr)); + DEFINE(CPU_SYSREGS, offsetof(struct kvm_cpu_context, sys_regs)); + DEFINE(VCPU_ESR_EL2, offsetof(struct kvm_vcpu, arch.fault.esr_el2)); + DEFINE(VCPU_FAR_EL2, offsetof(struct kvm_vcpu, arch.fault.far_el2)); + DEFINE(VCPU_HPFAR_EL2, offsetof(struct kvm_vcpu, arch.fault.hpfar_el2)); + DEFINE(VCPU_HCR_EL2, offsetof(struct kvm_vcpu, arch.hcr_el2)); + DEFINE(VCPU_IRQ_LINES, offsetof(struct kvm_vcpu, arch.irq_lines)); + DEFINE(VCPU_HOST_CONTEXT, offsetof(struct kvm_vcpu, arch.host_cpu_context)); + DEFINE(VCPU_TIMER_CNTV_CTL, offsetof(struct kvm_vcpu, arch.timer_cpu.cntv_ctl)); + DEFINE(VCPU_TIMER_CNTV_CVAL, offsetof(struct kvm_vcpu, arch.timer_cpu.cntv_cval)); + DEFINE(KVM_TIMER_CNTVOFF, offsetof(struct kvm, arch.timer.cntvoff)); + DEFINE(KVM_TIMER_ENABLED, offsetof(struct kvm, arch.timer.enabled)); + DEFINE(VCPU_KVM, offsetof(struct kvm_vcpu, kvm)); + DEFINE(VCPU_VGIC_CPU, offsetof(struct kvm_vcpu, arch.vgic_cpu)); + DEFINE(VGIC_CPU_HCR, offsetof(struct vgic_cpu, vgic_hcr)); + DEFINE(VGIC_CPU_VMCR, offsetof(struct vgic_cpu, vgic_vmcr)); + DEFINE(VGIC_CPU_MISR, offsetof(struct vgic_cpu, vgic_misr)); + DEFINE(VGIC_CPU_EISR, offsetof(struct vgic_cpu, vgic_eisr)); + DEFINE(VGIC_CPU_ELRSR, offsetof(struct vgic_cpu, vgic_elrsr)); + DEFINE(VGIC_CPU_APR, offsetof(struct vgic_cpu, vgic_apr)); + DEFINE(VGIC_CPU_LR, offsetof(struct vgic_cpu, vgic_lr)); + DEFINE(VGIC_CPU_NR_LR, offsetof(struct vgic_cpu, nr_lr)); + DEFINE(KVM_VTTBR, offsetof(struct kvm, arch.vttbr)); + DEFINE(KVM_VGIC_VCTRL, offsetof(struct kvm, arch.vgic.vctrl_base)); +#endif return 0; } diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c index f4726dc054b3..08018e3df580 100644 --- a/arch/arm64/kernel/debug-monitors.c +++ b/arch/arm64/kernel/debug-monitors.c @@ -24,6 +24,7 @@ #include <linux/init.h> #include <linux/ptrace.h> #include <linux/stat.h> +#include <linux/uaccess.h> #include <asm/debug-monitors.h> #include <asm/local.h> @@ -226,13 +227,74 @@ static int single_step_handler(unsigned long addr, unsigned int esr, return 0; } -static int __init single_step_init(void) +static int brk_handler(unsigned long addr, unsigned int esr, + struct pt_regs *regs) +{ + siginfo_t info; + + if (!user_mode(regs)) + return -EFAULT; + + info = (siginfo_t) { + .si_signo = SIGTRAP, + .si_errno = 0, + .si_code = TRAP_BRKPT, + .si_addr = (void __user *)instruction_pointer(regs), + }; + + force_sig_info(SIGTRAP, &info, current); + return 0; +} + +int aarch32_break_handler(struct pt_regs *regs) +{ + siginfo_t info; + unsigned int instr; + bool bp = false; + void __user *pc = (void __user *)instruction_pointer(regs); + + if (!compat_user_mode(regs)) + return -EFAULT; + + if (compat_thumb_mode(regs)) { + /* get 16-bit Thumb instruction */ + get_user(instr, (u16 __user *)pc); + if (instr == AARCH32_BREAK_THUMB2_LO) { + /* get second half of 32-bit Thumb-2 instruction */ + get_user(instr, (u16 __user *)(pc + 2)); + bp = instr == AARCH32_BREAK_THUMB2_HI; + } else { + bp = instr == AARCH32_BREAK_THUMB; + } + } else { + /* 32-bit ARM instruction */ + get_user(instr, (u32 __user *)pc); + bp = (instr & ~0xf0000000) == AARCH32_BREAK_ARM; + } + + if (!bp) + return -EFAULT; + + info = (siginfo_t) { + .si_signo = SIGTRAP, + .si_errno = 0, + .si_code = TRAP_BRKPT, + .si_addr = pc, + }; + + force_sig_info(SIGTRAP, &info, current); + return 0; +} + +static int __init debug_traps_init(void) { hook_debug_fault_code(DBG_ESR_EVT_HWSS, single_step_handler, SIGTRAP, TRAP_HWBKPT, "single-step handler"); + hook_debug_fault_code(DBG_ESR_EVT_BRK, brk_handler, SIGTRAP, + TRAP_BRKPT, "ptrace BRK handler"); return 0; } -arch_initcall(single_step_init); +arch_initcall(debug_traps_init); /* Re-enable single step for syscall restarting. */ void user_rewind_single_step(struct task_struct *task) diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index 6e1e77f1831c..fecdbf7de82e 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -53,28 +53,6 @@ void ptrace_disable(struct task_struct *child) { } -/* - * Handle hitting a breakpoint. - */ -static int ptrace_break(struct pt_regs *regs) -{ - siginfo_t info = { - .si_signo = SIGTRAP, - .si_errno = 0, - .si_code = TRAP_BRKPT, - .si_addr = (void __user *)instruction_pointer(regs), - }; - - force_sig_info(SIGTRAP, &info, current); - return 0; -} - -static int arm64_break_trap(unsigned long addr, unsigned int esr, - struct pt_regs *regs) -{ - return ptrace_break(regs); -} - #ifdef CONFIG_HAVE_HW_BREAKPOINT /* * Handle hitting a HW-breakpoint. @@ -817,33 +795,6 @@ static const struct user_regset_view user_aarch32_view = { .regsets = aarch32_regsets, .n = ARRAY_SIZE(aarch32_regsets) }; -int aarch32_break_trap(struct pt_regs *regs) -{ - unsigned int instr; - bool bp = false; - void __user *pc = (void __user *)instruction_pointer(regs); - - if (compat_thumb_mode(regs)) { - /* get 16-bit Thumb instruction */ - get_user(instr, (u16 __user *)pc); - if (instr == AARCH32_BREAK_THUMB2_LO) { - /* get second half of 32-bit Thumb-2 instruction */ - get_user(instr, (u16 __user *)(pc + 2)); - bp = instr == AARCH32_BREAK_THUMB2_HI; - } else { - bp = instr == AARCH32_BREAK_THUMB; - } - } else { - /* 32-bit ARM instruction */ - get_user(instr, (u32 __user *)pc); - bp = (instr & ~0xf0000000) == AARCH32_BREAK_ARM; - } - - if (bp) - return ptrace_break(regs); - return 1; -} - static int compat_ptrace_read_user(struct task_struct *tsk, compat_ulong_t off, compat_ulong_t __user *ret) { @@ -1111,16 +1062,6 @@ long arch_ptrace(struct task_struct *child, long request, return ptrace_request(child, request, addr, data); } - -static int __init ptrace_break_init(void) -{ - hook_debug_fault_code(DBG_ESR_EVT_BRK, arm64_break_trap, SIGTRAP, - TRAP_BRKPT, "ptrace BRK handler"); - return 0; -} -core_initcall(ptrace_break_init); - - asmlinkage int syscall_trace(int dir, struct pt_regs *regs) { unsigned long saved_reg; diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c index a551f88ae2c1..03dc3718eb13 100644 --- a/arch/arm64/kernel/time.c +++ b/arch/arm64/kernel/time.c @@ -68,12 +68,6 @@ unsigned long long notrace sched_clock(void) return arch_timer_read_counter() * sched_clock_mult; } -int read_current_timer(unsigned long *timer_value) -{ - *timer_value = arch_timer_read_counter(); - return 0; -} - void __init time_init(void) { u32 arch_timer_rate; diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index f30852d28590..7ffadddb645d 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -32,6 +32,7 @@ #include <linux/syscalls.h> #include <asm/atomic.h> +#include <asm/debug-monitors.h> #include <asm/traps.h> #include <asm/stacktrace.h> #include <asm/exception.h> @@ -261,11 +262,9 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs) siginfo_t info; void __user *pc = (void __user *)instruction_pointer(regs); -#ifdef CONFIG_COMPAT /* check for AArch32 breakpoint instructions */ - if (compat_user_mode(regs) && aarch32_break_trap(regs) == 0) + if (!aarch32_break_handler(regs)) return; -#endif if (show_unhandled_signals && unhandled_signal(current, SIGILL) && printk_ratelimit()) { diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index 3fae2be8b016..f5e55747242f 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S @@ -17,6 +17,19 @@ ENTRY(stext) jiffies = jiffies_64; +#define HYPERVISOR_TEXT \ + /* \ + * Force the alignment to be compatible with \ + * the vectors requirements \ + */ \ + . = ALIGN(2048); \ + VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \ + *(.hyp.idmap.text) \ + VMLINUX_SYMBOL(__hyp_idmap_text_end) = .; \ + VMLINUX_SYMBOL(__hyp_text_start) = .; \ + *(.hyp.text) \ + VMLINUX_SYMBOL(__hyp_text_end) = .; + SECTIONS { /* @@ -49,6 +62,7 @@ SECTIONS TEXT_TEXT SCHED_TEXT LOCK_TEXT + HYPERVISOR_TEXT *(.fixup) *(.gnu.warning) . = ALIGN(16); @@ -56,7 +70,7 @@ SECTIONS } RO_DATA(PAGE_SIZE) - + EXCEPTION_TABLE(8) _etext = .; /* End of text and rodata section */ . = ALIGN(PAGE_SIZE); @@ -99,14 +113,6 @@ SECTIONS READ_MOSTLY_DATA(64) /* - * The exception fixup table (might need resorting at runtime) - */ - . = ALIGN(32); - __start___ex_table = .; - *(__ex_table) - __stop___ex_table = .; - - /* * and the usual data section */ DATA_DATA @@ -124,3 +130,9 @@ SECTIONS STABS_DEBUG .comment 0 : { *(.comment) } } + +/* + * The HYP init code can't be more than a page long. + */ +ASSERT(((__hyp_idmap_text_start + PAGE_SIZE) > __hyp_idmap_text_end), + "HYP init code too big") diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile new file mode 100644 index 000000000000..72a9fd583ad3 --- /dev/null +++ b/arch/arm64/kvm/Makefile @@ -0,0 +1,23 @@ +# +# Makefile for Kernel-based Virtual Machine module +# + +ccflags-y += -Ivirt/kvm -Iarch/arm64/kvm +CFLAGS_arm.o := -I. +CFLAGS_mmu.o := -I. + +KVM=../../../virt/kvm +ARM=../../../arch/arm/kvm + +obj-$(CONFIG_KVM_ARM_HOST) += kvm.o + +kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o +kvm-$(CONFIG_KVM_ARM_HOST) += $(ARM)/arm.o $(ARM)/mmu.o $(ARM)/mmio.o +kvm-$(CONFIG_KVM_ARM_HOST) += $(ARM)/psci.o $(ARM)/perf.o + +kvm-$(CONFIG_KVM_ARM_HOST) += emulate.o inject_fault.o regmap.o +kvm-$(CONFIG_KVM_ARM_HOST) += hyp.o hyp-init.o handle_exit.o +kvm-$(CONFIG_KVM_ARM_HOST) += guest.o reset.o sys_regs.o sys_regs_generic_v8.o + +kvm-$(CONFIG_KVM_ARM_VGIC) += $(KVM)/arm/vgic.o +kvm-$(CONFIG_KVM_ARM_TIMER) += $(KVM)/arm/arch_timer.o diff --git a/arch/arm64/kvm/emulate.c b/arch/arm64/kvm/emulate.c new file mode 100644 index 000000000000..124418d17049 --- /dev/null +++ b/arch/arm64/kvm/emulate.c @@ -0,0 +1,158 @@ +/* + * (not much of an) Emulation layer for 32bit guests. + * + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * based on arch/arm/kvm/emulate.c + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Author: Christoffer Dall <c.dall@virtualopensystems.com> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/kvm_host.h> +#include <asm/kvm_emulate.h> + +/* + * stolen from arch/arm/kernel/opcodes.c + * + * condition code lookup table + * index into the table is test code: EQ, NE, ... LT, GT, AL, NV + * + * bit position in short is condition code: NZCV + */ +static const unsigned short cc_map[16] = { + 0xF0F0, /* EQ == Z set */ + 0x0F0F, /* NE */ + 0xCCCC, /* CS == C set */ + 0x3333, /* CC */ + 0xFF00, /* MI == N set */ + 0x00FF, /* PL */ + 0xAAAA, /* VS == V set */ + 0x5555, /* VC */ + 0x0C0C, /* HI == C set && Z clear */ + 0xF3F3, /* LS == C clear || Z set */ + 0xAA55, /* GE == (N==V) */ + 0x55AA, /* LT == (N!=V) */ + 0x0A05, /* GT == (!Z && (N==V)) */ + 0xF5FA, /* LE == (Z || (N!=V)) */ + 0xFFFF, /* AL always */ + 0 /* NV */ +}; + +static int kvm_vcpu_get_condition(const struct kvm_vcpu *vcpu) +{ + u32 esr = kvm_vcpu_get_hsr(vcpu); + + if (esr & ESR_EL2_CV) + return (esr & ESR_EL2_COND) >> ESR_EL2_COND_SHIFT; + + return -1; +} + +/* + * Check if a trapped instruction should have been executed or not. + */ +bool kvm_condition_valid32(const struct kvm_vcpu *vcpu) +{ + unsigned long cpsr; + u32 cpsr_cond; + int cond; + + /* Top two bits non-zero? Unconditional. */ + if (kvm_vcpu_get_hsr(vcpu) >> 30) + return true; + + /* Is condition field valid? */ + cond = kvm_vcpu_get_condition(vcpu); + if (cond == 0xE) + return true; + + cpsr = *vcpu_cpsr(vcpu); + + if (cond < 0) { + /* This can happen in Thumb mode: examine IT state. */ + unsigned long it; + + it = ((cpsr >> 8) & 0xFC) | ((cpsr >> 25) & 0x3); + + /* it == 0 => unconditional. */ + if (it == 0) + return true; + + /* The cond for this insn works out as the top 4 bits. */ + cond = (it >> 4); + } + + cpsr_cond = cpsr >> 28; + + if (!((cc_map[cond] >> cpsr_cond) & 1)) + return false; + + return true; +} + +/** + * adjust_itstate - adjust ITSTATE when emulating instructions in IT-block + * @vcpu: The VCPU pointer + * + * When exceptions occur while instructions are executed in Thumb IF-THEN + * blocks, the ITSTATE field of the CPSR is not advanced (updated), so we have + * to do this little bit of work manually. The fields map like this: + * + * IT[7:0] -> CPSR[26:25],CPSR[15:10] + */ +static void kvm_adjust_itstate(struct kvm_vcpu *vcpu) +{ + unsigned long itbits, cond; + unsigned long cpsr = *vcpu_cpsr(vcpu); + bool is_arm = !(cpsr & COMPAT_PSR_T_BIT); + + BUG_ON(is_arm && (cpsr & COMPAT_PSR_IT_MASK)); + + if (!(cpsr & COMPAT_PSR_IT_MASK)) + return; + + cond = (cpsr & 0xe000) >> 13; + itbits = (cpsr & 0x1c00) >> (10 - 2); + itbits |= (cpsr & (0x3 << 25)) >> 25; + + /* Perform ITAdvance (see page A2-52 in ARM DDI 0406C) */ + if ((itbits & 0x7) == 0) + itbits = cond = 0; + else + itbits = (itbits << 1) & 0x1f; + + cpsr &= ~COMPAT_PSR_IT_MASK; + cpsr |= cond << 13; + cpsr |= (itbits & 0x1c) << (10 - 2); + cpsr |= (itbits & 0x3) << 25; + *vcpu_cpsr(vcpu) = cpsr; +} + +/** + * kvm_skip_instr - skip a trapped instruction and proceed to the next + * @vcpu: The vcpu pointer + */ +void kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr) +{ + bool is_thumb; + + is_thumb = !!(*vcpu_cpsr(vcpu) & COMPAT_PSR_T_BIT); + if (is_thumb && !is_wide_instr) + *vcpu_pc(vcpu) += 2; + else + *vcpu_pc(vcpu) += 4; + kvm_adjust_itstate(vcpu); +} diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c new file mode 100644 index 000000000000..2c3ff67a8ecb --- /dev/null +++ b/arch/arm64/kvm/guest.c @@ -0,0 +1,265 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * Derived from arch/arm/kvm/guest.c: + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Author: Christoffer Dall <c.dall@virtualopensystems.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/kvm_host.h> +#include <linux/module.h> +#include <linux/vmalloc.h> +#include <linux/fs.h> +#include <asm/cputype.h> +#include <asm/uaccess.h> +#include <asm/kvm.h> +#include <asm/kvm_asm.h> +#include <asm/kvm_emulate.h> +#include <asm/kvm_coproc.h> + +struct kvm_stats_debugfs_item debugfs_entries[] = { + { NULL } +}; + +int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) +{ + vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS; + return 0; +} + +static u64 core_reg_offset_from_id(u64 id) +{ + return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE); +} + +static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) +{ + /* + * Because the kvm_regs structure is a mix of 32, 64 and + * 128bit fields, we index it as if it was a 32bit + * array. Hence below, nr_regs is the number of entries, and + * off the index in the "array". + */ + __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr; + struct kvm_regs *regs = vcpu_gp_regs(vcpu); + int nr_regs = sizeof(*regs) / sizeof(__u32); + u32 off; + + /* Our ID is an index into the kvm_regs struct. */ + off = core_reg_offset_from_id(reg->id); + if (off >= nr_regs || + (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs) + return -ENOENT; + + if (copy_to_user(uaddr, ((u32 *)regs) + off, KVM_REG_SIZE(reg->id))) + return -EFAULT; + + return 0; +} + +static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) +{ + __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr; + struct kvm_regs *regs = vcpu_gp_regs(vcpu); + int nr_regs = sizeof(*regs) / sizeof(__u32); + __uint128_t tmp; + void *valp = &tmp; + u64 off; + int err = 0; + + /* Our ID is an index into the kvm_regs struct. */ + off = core_reg_offset_from_id(reg->id); + if (off >= nr_regs || + (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs) + return -ENOENT; + + if (KVM_REG_SIZE(reg->id) > sizeof(tmp)) + return -EINVAL; + + if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) { + err = -EFAULT; + goto out; + } + + if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) { + u32 mode = (*(u32 *)valp) & COMPAT_PSR_MODE_MASK; + switch (mode) { + case COMPAT_PSR_MODE_USR: + case COMPAT_PSR_MODE_FIQ: + case COMPAT_PSR_MODE_IRQ: + case COMPAT_PSR_MODE_SVC: + case COMPAT_PSR_MODE_ABT: + case COMPAT_PSR_MODE_UND: + case PSR_MODE_EL0t: + case PSR_MODE_EL1t: + case PSR_MODE_EL1h: + break; + default: + err = -EINVAL; + goto out; + } + } + + memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id)); +out: + return err; +} + +int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) +{ + return -EINVAL; +} + +int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) +{ + return -EINVAL; +} + +static unsigned long num_core_regs(void) +{ + return sizeof(struct kvm_regs) / sizeof(__u32); +} + +/** + * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG + * + * This is for all registers. + */ +unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu) +{ + return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu); +} + +/** + * kvm_arm_copy_reg_indices - get indices of all registers. + * + * We do core registers right here, then we apppend system regs. + */ +int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) +{ + unsigned int i; + const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE; + + for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) { + if (put_user(core_reg | i, uindices)) + return -EFAULT; + uindices++; + } + + return kvm_arm_copy_sys_reg_indices(vcpu, uindices); +} + +int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) +{ + /* We currently use nothing arch-specific in upper 32 bits */ + if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32) + return -EINVAL; + + /* Register group 16 means we want a core register. */ + if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE) + return get_core_reg(vcpu, reg); + + return kvm_arm_sys_reg_get_reg(vcpu, reg); +} + +int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) +{ + /* We currently use nothing arch-specific in upper 32 bits */ + if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32) + return -EINVAL; + + /* Register group 16 means we set a core register. */ + if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE) + return set_core_reg(vcpu, reg); + + return kvm_arm_sys_reg_set_reg(vcpu, reg); +} + +int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) +{ + return -EINVAL; +} + +int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) +{ + return -EINVAL; +} + +int __attribute_const__ kvm_target_cpu(void) +{ + unsigned long implementor = read_cpuid_implementor(); + unsigned long part_number = read_cpuid_part_number(); + + if (implementor != ARM_CPU_IMP_ARM) + return -EINVAL; + + switch (part_number) { + case ARM_CPU_PART_AEM_V8: + return KVM_ARM_TARGET_AEM_V8; + case ARM_CPU_PART_FOUNDATION: + return KVM_ARM_TARGET_FOUNDATION_V8; + case ARM_CPU_PART_CORTEX_A57: + /* Currently handled by the generic backend */ + return KVM_ARM_TARGET_CORTEX_A57; + default: + return -EINVAL; + } +} + +int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, + const struct kvm_vcpu_init *init) +{ + unsigned int i; + int phys_target = kvm_target_cpu(); + + if (init->target != phys_target) + return -EINVAL; + + vcpu->arch.target = phys_target; + bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); + + /* -ENOENT for unknown features, -EINVAL for invalid combinations. */ + for (i = 0; i < sizeof(init->features) * 8; i++) { + if (init->features[i / 32] & (1 << (i % 32))) { + if (i >= KVM_VCPU_MAX_FEATURES) + return -ENOENT; + set_bit(i, vcpu->arch.features); + } + } + + /* Now we know what it is, we can reset it. */ + return kvm_reset_vcpu(vcpu); +} + +int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) +{ + return -EINVAL; +} + +int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) +{ + return -EINVAL; +} + +int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, + struct kvm_translation *tr) +{ + return -EINVAL; +} diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c new file mode 100644 index 000000000000..9beaca033437 --- /dev/null +++ b/arch/arm64/kvm/handle_exit.c @@ -0,0 +1,124 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * Derived from arch/arm/kvm/handle_exit.c: + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Author: Christoffer Dall <c.dall@virtualopensystems.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/kvm.h> +#include <linux/kvm_host.h> +#include <asm/kvm_emulate.h> +#include <asm/kvm_coproc.h> +#include <asm/kvm_mmu.h> +#include <asm/kvm_psci.h> + +typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *); + +static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + if (kvm_psci_call(vcpu)) + return 1; + + kvm_inject_undefined(vcpu); + return 1; +} + +static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + if (kvm_psci_call(vcpu)) + return 1; + + kvm_inject_undefined(vcpu); + return 1; +} + +/** + * kvm_handle_wfi - handle a wait-for-interrupts instruction executed by a guest + * @vcpu: the vcpu pointer + * + * Simply call kvm_vcpu_block(), which will halt execution of + * world-switches and schedule other host processes until there is an + * incoming IRQ or FIQ to the VM. + */ +static int kvm_handle_wfi(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + kvm_vcpu_block(vcpu); + return 1; +} + +static exit_handle_fn arm_exit_handlers[] = { + [ESR_EL2_EC_WFI] = kvm_handle_wfi, + [ESR_EL2_EC_CP15_32] = kvm_handle_cp15_32, + [ESR_EL2_EC_CP15_64] = kvm_handle_cp15_64, + [ESR_EL2_EC_CP14_MR] = kvm_handle_cp14_access, + [ESR_EL2_EC_CP14_LS] = kvm_handle_cp14_load_store, + [ESR_EL2_EC_CP14_64] = kvm_handle_cp14_access, + [ESR_EL2_EC_HVC32] = handle_hvc, + [ESR_EL2_EC_SMC32] = handle_smc, + [ESR_EL2_EC_HVC64] = handle_hvc, + [ESR_EL2_EC_SMC64] = handle_smc, + [ESR_EL2_EC_SYS64] = kvm_handle_sys_reg, + [ESR_EL2_EC_IABT] = kvm_handle_guest_abort, + [ESR_EL2_EC_DABT] = kvm_handle_guest_abort, +}; + +static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu) +{ + u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu); + + if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) || + !arm_exit_handlers[hsr_ec]) { + kvm_err("Unkown exception class: hsr: %#08x\n", + (unsigned int)kvm_vcpu_get_hsr(vcpu)); + BUG(); + } + + return arm_exit_handlers[hsr_ec]; +} + +/* + * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on + * proper exit to userspace. + */ +int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, + int exception_index) +{ + exit_handle_fn exit_handler; + + switch (exception_index) { + case ARM_EXCEPTION_IRQ: + return 1; + case ARM_EXCEPTION_TRAP: + /* + * See ARM ARM B1.14.1: "Hyp traps on instructions + * that fail their condition code check" + */ + if (!kvm_condition_valid(vcpu)) { + kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); + return 1; + } + + exit_handler = kvm_get_exit_handler(vcpu); + + return exit_handler(vcpu, run); + default: + kvm_pr_unimpl("Unsupported exception type: %d", + exception_index); + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + return 0; + } +} diff --git a/arch/arm64/kvm/hyp-init.S b/arch/arm64/kvm/hyp-init.S new file mode 100644 index 000000000000..ba84e6705e20 --- /dev/null +++ b/arch/arm64/kvm/hyp-init.S @@ -0,0 +1,107 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/linkage.h> + +#include <asm/assembler.h> +#include <asm/kvm_arm.h> +#include <asm/kvm_mmu.h> + + .text + .pushsection .hyp.idmap.text, "ax" + + .align 11 + +ENTRY(__kvm_hyp_init) + ventry __invalid // Synchronous EL2t + ventry __invalid // IRQ EL2t + ventry __invalid // FIQ EL2t + ventry __invalid // Error EL2t + + ventry __invalid // Synchronous EL2h + ventry __invalid // IRQ EL2h + ventry __invalid // FIQ EL2h + ventry __invalid // Error EL2h + + ventry __do_hyp_init // Synchronous 64-bit EL1 + ventry __invalid // IRQ 64-bit EL1 + ventry __invalid // FIQ 64-bit EL1 + ventry __invalid // Error 64-bit EL1 + + ventry __invalid // Synchronous 32-bit EL1 + ventry __invalid // IRQ 32-bit EL1 + ventry __invalid // FIQ 32-bit EL1 + ventry __invalid // Error 32-bit EL1 + +__invalid: + b . + + /* + * x0: HYP boot pgd + * x1: HYP pgd + * x2: HYP stack + * x3: HYP vectors + */ +__do_hyp_init: + + msr ttbr0_el2, x0 + + mrs x4, tcr_el1 + ldr x5, =TCR_EL2_MASK + and x4, x4, x5 + ldr x5, =TCR_EL2_FLAGS + orr x4, x4, x5 + msr tcr_el2, x4 + + ldr x4, =VTCR_EL2_FLAGS + msr vtcr_el2, x4 + + mrs x4, mair_el1 + msr mair_el2, x4 + isb + + mov x4, #SCTLR_EL2_FLAGS + msr sctlr_el2, x4 + isb + + /* MMU is now enabled. Get ready for the trampoline dance */ + ldr x4, =TRAMPOLINE_VA + adr x5, target + bfi x4, x5, #0, #PAGE_SHIFT + br x4 + +target: /* We're now in the trampoline code, switch page tables */ + msr ttbr0_el2, x1 + isb + + /* Invalidate the old TLBs */ + tlbi alle2 + dsb sy + + /* Set the stack and new vectors */ + kern_hyp_va x2 + mov sp, x2 + kern_hyp_va x3 + msr vbar_el2, x3 + + /* Hello, World! */ + eret +ENDPROC(__kvm_hyp_init) + + .ltorg + + .popsection diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S new file mode 100644 index 000000000000..ff985e3d8b72 --- /dev/null +++ b/arch/arm64/kvm/hyp.S @@ -0,0 +1,831 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/linkage.h> +#include <linux/irqchip/arm-gic.h> + +#include <asm/assembler.h> +#include <asm/memory.h> +#include <asm/asm-offsets.h> +#include <asm/fpsimdmacros.h> +#include <asm/kvm.h> +#include <asm/kvm_asm.h> +#include <asm/kvm_arm.h> +#include <asm/kvm_mmu.h> + +#define CPU_GP_REG_OFFSET(x) (CPU_GP_REGS + x) +#define CPU_XREG_OFFSET(x) CPU_GP_REG_OFFSET(CPU_USER_PT_REGS + 8*x) +#define CPU_SPSR_OFFSET(x) CPU_GP_REG_OFFSET(CPU_SPSR + 8*x) +#define CPU_SYSREG_OFFSET(x) (CPU_SYSREGS + 8*x) + + .text + .pushsection .hyp.text, "ax" + .align PAGE_SHIFT + +__kvm_hyp_code_start: + .globl __kvm_hyp_code_start + +.macro save_common_regs + // x2: base address for cpu context + // x3: tmp register + + add x3, x2, #CPU_XREG_OFFSET(19) + stp x19, x20, [x3] + stp x21, x22, [x3, #16] + stp x23, x24, [x3, #32] + stp x25, x26, [x3, #48] + stp x27, x28, [x3, #64] + stp x29, lr, [x3, #80] + + mrs x19, sp_el0 + mrs x20, elr_el2 // EL1 PC + mrs x21, spsr_el2 // EL1 pstate + + stp x19, x20, [x3, #96] + str x21, [x3, #112] + + mrs x22, sp_el1 + mrs x23, elr_el1 + mrs x24, spsr_el1 + + str x22, [x2, #CPU_GP_REG_OFFSET(CPU_SP_EL1)] + str x23, [x2, #CPU_GP_REG_OFFSET(CPU_ELR_EL1)] + str x24, [x2, #CPU_SPSR_OFFSET(KVM_SPSR_EL1)] +.endm + +.macro restore_common_regs + // x2: base address for cpu context + // x3: tmp register + + ldr x22, [x2, #CPU_GP_REG_OFFSET(CPU_SP_EL1)] + ldr x23, [x2, #CPU_GP_REG_OFFSET(CPU_ELR_EL1)] + ldr x24, [x2, #CPU_SPSR_OFFSET(KVM_SPSR_EL1)] + + msr sp_el1, x22 + msr elr_el1, x23 + msr spsr_el1, x24 + + add x3, x2, #CPU_XREG_OFFSET(31) // SP_EL0 + ldp x19, x20, [x3] + ldr x21, [x3, #16] + + msr sp_el0, x19 + msr elr_el2, x20 // EL1 PC + msr spsr_el2, x21 // EL1 pstate + + add x3, x2, #CPU_XREG_OFFSET(19) + ldp x19, x20, [x3] + ldp x21, x22, [x3, #16] + ldp x23, x24, [x3, #32] + ldp x25, x26, [x3, #48] + ldp x27, x28, [x3, #64] + ldp x29, lr, [x3, #80] +.endm + +.macro save_host_regs + save_common_regs +.endm + +.macro restore_host_regs + restore_common_regs +.endm + +.macro save_fpsimd + // x2: cpu context address + // x3, x4: tmp regs + add x3, x2, #CPU_GP_REG_OFFSET(CPU_FP_REGS) + fpsimd_save x3, 4 +.endm + +.macro restore_fpsimd + // x2: cpu context address + // x3, x4: tmp regs + add x3, x2, #CPU_GP_REG_OFFSET(CPU_FP_REGS) + fpsimd_restore x3, 4 +.endm + +.macro save_guest_regs + // x0 is the vcpu address + // x1 is the return code, do not corrupt! + // x2 is the cpu context + // x3 is a tmp register + // Guest's x0-x3 are on the stack + + // Compute base to save registers + add x3, x2, #CPU_XREG_OFFSET(4) + stp x4, x5, [x3] + stp x6, x7, [x3, #16] + stp x8, x9, [x3, #32] + stp x10, x11, [x3, #48] + stp x12, x13, [x3, #64] + stp x14, x15, [x3, #80] + stp x16, x17, [x3, #96] + str x18, [x3, #112] + + pop x6, x7 // x2, x3 + pop x4, x5 // x0, x1 + + add x3, x2, #CPU_XREG_OFFSET(0) + stp x4, x5, [x3] + stp x6, x7, [x3, #16] + + save_common_regs +.endm + +.macro restore_guest_regs + // x0 is the vcpu address. + // x2 is the cpu context + // x3 is a tmp register + + // Prepare x0-x3 for later restore + add x3, x2, #CPU_XREG_OFFSET(0) + ldp x4, x5, [x3] + ldp x6, x7, [x3, #16] + push x4, x5 // Push x0-x3 on the stack + push x6, x7 + + // x4-x18 + ldp x4, x5, [x3, #32] + ldp x6, x7, [x3, #48] + ldp x8, x9, [x3, #64] + ldp x10, x11, [x3, #80] + ldp x12, x13, [x3, #96] + ldp x14, x15, [x3, #112] + ldp x16, x17, [x3, #128] + ldr x18, [x3, #144] + + // x19-x29, lr, sp*, elr*, spsr* + restore_common_regs + + // Last bits of the 64bit state + pop x2, x3 + pop x0, x1 + + // Do not touch any register after this! +.endm + +/* + * Macros to perform system register save/restore. + * + * Ordering here is absolutely critical, and must be kept consistent + * in {save,restore}_sysregs, {save,restore}_guest_32bit_state, + * and in kvm_asm.h. + * + * In other words, don't touch any of these unless you know what + * you are doing. + */ +.macro save_sysregs + // x2: base address for cpu context + // x3: tmp register + + add x3, x2, #CPU_SYSREG_OFFSET(MPIDR_EL1) + + mrs x4, vmpidr_el2 + mrs x5, csselr_el1 + mrs x6, sctlr_el1 + mrs x7, actlr_el1 + mrs x8, cpacr_el1 + mrs x9, ttbr0_el1 + mrs x10, ttbr1_el1 + mrs x11, tcr_el1 + mrs x12, esr_el1 + mrs x13, afsr0_el1 + mrs x14, afsr1_el1 + mrs x15, far_el1 + mrs x16, mair_el1 + mrs x17, vbar_el1 + mrs x18, contextidr_el1 + mrs x19, tpidr_el0 + mrs x20, tpidrro_el0 + mrs x21, tpidr_el1 + mrs x22, amair_el1 + mrs x23, cntkctl_el1 + + stp x4, x5, [x3] + stp x6, x7, [x3, #16] + stp x8, x9, [x3, #32] + stp x10, x11, [x3, #48] + stp x12, x13, [x3, #64] + stp x14, x15, [x3, #80] + stp x16, x17, [x3, #96] + stp x18, x19, [x3, #112] + stp x20, x21, [x3, #128] + stp x22, x23, [x3, #144] +.endm + +.macro restore_sysregs + // x2: base address for cpu context + // x3: tmp register + + add x3, x2, #CPU_SYSREG_OFFSET(MPIDR_EL1) + + ldp x4, x5, [x3] + ldp x6, x7, [x3, #16] + ldp x8, x9, [x3, #32] + ldp x10, x11, [x3, #48] + ldp x12, x13, [x3, #64] + ldp x14, x15, [x3, #80] + ldp x16, x17, [x3, #96] + ldp x18, x19, [x3, #112] + ldp x20, x21, [x3, #128] + ldp x22, x23, [x3, #144] + + msr vmpidr_el2, x4 + msr csselr_el1, x5 + msr sctlr_el1, x6 + msr actlr_el1, x7 + msr cpacr_el1, x8 + msr ttbr0_el1, x9 + msr ttbr1_el1, x10 + msr tcr_el1, x11 + msr esr_el1, x12 + msr afsr0_el1, x13 + msr afsr1_el1, x14 + msr far_el1, x15 + msr mair_el1, x16 + msr vbar_el1, x17 + msr contextidr_el1, x18 + msr tpidr_el0, x19 + msr tpidrro_el0, x20 + msr tpidr_el1, x21 + msr amair_el1, x22 + msr cntkctl_el1, x23 +.endm + +.macro skip_32bit_state tmp, target + // Skip 32bit state if not needed + mrs \tmp, hcr_el2 + tbnz \tmp, #HCR_RW_SHIFT, \target +.endm + +.macro skip_tee_state tmp, target + // Skip ThumbEE state if not needed + mrs \tmp, id_pfr0_el1 + tbz \tmp, #12, \target +.endm + +.macro save_guest_32bit_state + skip_32bit_state x3, 1f + + add x3, x2, #CPU_SPSR_OFFSET(KVM_SPSR_ABT) + mrs x4, spsr_abt + mrs x5, spsr_und + mrs x6, spsr_irq + mrs x7, spsr_fiq + stp x4, x5, [x3] + stp x6, x7, [x3, #16] + + add x3, x2, #CPU_SYSREG_OFFSET(DACR32_EL2) + mrs x4, dacr32_el2 + mrs x5, ifsr32_el2 + mrs x6, fpexc32_el2 + mrs x7, dbgvcr32_el2 + stp x4, x5, [x3] + stp x6, x7, [x3, #16] + + skip_tee_state x8, 1f + + add x3, x2, #CPU_SYSREG_OFFSET(TEECR32_EL1) + mrs x4, teecr32_el1 + mrs x5, teehbr32_el1 + stp x4, x5, [x3] +1: +.endm + +.macro restore_guest_32bit_state + skip_32bit_state x3, 1f + + add x3, x2, #CPU_SPSR_OFFSET(KVM_SPSR_ABT) + ldp x4, x5, [x3] + ldp x6, x7, [x3, #16] + msr spsr_abt, x4 + msr spsr_und, x5 + msr spsr_irq, x6 + msr spsr_fiq, x7 + + add x3, x2, #CPU_SYSREG_OFFSET(DACR32_EL2) + ldp x4, x5, [x3] + ldp x6, x7, [x3, #16] + msr dacr32_el2, x4 + msr ifsr32_el2, x5 + msr fpexc32_el2, x6 + msr dbgvcr32_el2, x7 + + skip_tee_state x8, 1f + + add x3, x2, #CPU_SYSREG_OFFSET(TEECR32_EL1) + ldp x4, x5, [x3] + msr teecr32_el1, x4 + msr teehbr32_el1, x5 +1: +.endm + +.macro activate_traps + ldr x2, [x0, #VCPU_IRQ_LINES] + ldr x1, [x0, #VCPU_HCR_EL2] + orr x2, x2, x1 + msr hcr_el2, x2 + + ldr x2, =(CPTR_EL2_TTA) + msr cptr_el2, x2 + + ldr x2, =(1 << 15) // Trap CP15 Cr=15 + msr hstr_el2, x2 + + mrs x2, mdcr_el2 + and x2, x2, #MDCR_EL2_HPMN_MASK + orr x2, x2, #(MDCR_EL2_TPM | MDCR_EL2_TPMCR) + msr mdcr_el2, x2 +.endm + +.macro deactivate_traps + mov x2, #HCR_RW + msr hcr_el2, x2 + msr cptr_el2, xzr + msr hstr_el2, xzr + + mrs x2, mdcr_el2 + and x2, x2, #MDCR_EL2_HPMN_MASK + msr mdcr_el2, x2 +.endm + +.macro activate_vm + ldr x1, [x0, #VCPU_KVM] + kern_hyp_va x1 + ldr x2, [x1, #KVM_VTTBR] + msr vttbr_el2, x2 +.endm + +.macro deactivate_vm + msr vttbr_el2, xzr +.endm + +/* + * Save the VGIC CPU state into memory + * x0: Register pointing to VCPU struct + * Do not corrupt x1!!! + */ +.macro save_vgic_state + /* Get VGIC VCTRL base into x2 */ + ldr x2, [x0, #VCPU_KVM] + kern_hyp_va x2 + ldr x2, [x2, #KVM_VGIC_VCTRL] + kern_hyp_va x2 + cbz x2, 2f // disabled + + /* Compute the address of struct vgic_cpu */ + add x3, x0, #VCPU_VGIC_CPU + + /* Save all interesting registers */ + ldr w4, [x2, #GICH_HCR] + ldr w5, [x2, #GICH_VMCR] + ldr w6, [x2, #GICH_MISR] + ldr w7, [x2, #GICH_EISR0] + ldr w8, [x2, #GICH_EISR1] + ldr w9, [x2, #GICH_ELRSR0] + ldr w10, [x2, #GICH_ELRSR1] + ldr w11, [x2, #GICH_APR] + + str w4, [x3, #VGIC_CPU_HCR] + str w5, [x3, #VGIC_CPU_VMCR] + str w6, [x3, #VGIC_CPU_MISR] + str w7, [x3, #VGIC_CPU_EISR] + str w8, [x3, #(VGIC_CPU_EISR + 4)] + str w9, [x3, #VGIC_CPU_ELRSR] + str w10, [x3, #(VGIC_CPU_ELRSR + 4)] + str w11, [x3, #VGIC_CPU_APR] + + /* Clear GICH_HCR */ + str wzr, [x2, #GICH_HCR] + + /* Save list registers */ + add x2, x2, #GICH_LR0 + ldr w4, [x3, #VGIC_CPU_NR_LR] + add x3, x3, #VGIC_CPU_LR +1: ldr w5, [x2], #4 + str w5, [x3], #4 + sub w4, w4, #1 + cbnz w4, 1b +2: +.endm + +/* + * Restore the VGIC CPU state from memory + * x0: Register pointing to VCPU struct + */ +.macro restore_vgic_state + /* Get VGIC VCTRL base into x2 */ + ldr x2, [x0, #VCPU_KVM] + kern_hyp_va x2 + ldr x2, [x2, #KVM_VGIC_VCTRL] + kern_hyp_va x2 + cbz x2, 2f // disabled + + /* Compute the address of struct vgic_cpu */ + add x3, x0, #VCPU_VGIC_CPU + + /* We only restore a minimal set of registers */ + ldr w4, [x3, #VGIC_CPU_HCR] + ldr w5, [x3, #VGIC_CPU_VMCR] + ldr w6, [x3, #VGIC_CPU_APR] + + str w4, [x2, #GICH_HCR] + str w5, [x2, #GICH_VMCR] + str w6, [x2, #GICH_APR] + + /* Restore list registers */ + add x2, x2, #GICH_LR0 + ldr w4, [x3, #VGIC_CPU_NR_LR] + add x3, x3, #VGIC_CPU_LR +1: ldr w5, [x3], #4 + str w5, [x2], #4 + sub w4, w4, #1 + cbnz w4, 1b +2: +.endm + +.macro save_timer_state + // x0: vcpu pointer + ldr x2, [x0, #VCPU_KVM] + kern_hyp_va x2 + ldr w3, [x2, #KVM_TIMER_ENABLED] + cbz w3, 1f + + mrs x3, cntv_ctl_el0 + and x3, x3, #3 + str w3, [x0, #VCPU_TIMER_CNTV_CTL] + bic x3, x3, #1 // Clear Enable + msr cntv_ctl_el0, x3 + + isb + + mrs x3, cntv_cval_el0 + str x3, [x0, #VCPU_TIMER_CNTV_CVAL] + +1: + // Allow physical timer/counter access for the host + mrs x2, cnthctl_el2 + orr x2, x2, #3 + msr cnthctl_el2, x2 + + // Clear cntvoff for the host + msr cntvoff_el2, xzr +.endm + +.macro restore_timer_state + // x0: vcpu pointer + // Disallow physical timer access for the guest + // Physical counter access is allowed + mrs x2, cnthctl_el2 + orr x2, x2, #1 + bic x2, x2, #2 + msr cnthctl_el2, x2 + + ldr x2, [x0, #VCPU_KVM] + kern_hyp_va x2 + ldr w3, [x2, #KVM_TIMER_ENABLED] + cbz w3, 1f + + ldr x3, [x2, #KVM_TIMER_CNTVOFF] + msr cntvoff_el2, x3 + ldr x2, [x0, #VCPU_TIMER_CNTV_CVAL] + msr cntv_cval_el0, x2 + isb + + ldr w2, [x0, #VCPU_TIMER_CNTV_CTL] + and x2, x2, #3 + msr cntv_ctl_el0, x2 +1: +.endm + +__save_sysregs: + save_sysregs + ret + +__restore_sysregs: + restore_sysregs + ret + +__save_fpsimd: + save_fpsimd + ret + +__restore_fpsimd: + restore_fpsimd + ret + +/* + * u64 __kvm_vcpu_run(struct kvm_vcpu *vcpu); + * + * This is the world switch. The first half of the function + * deals with entering the guest, and anything from __kvm_vcpu_return + * to the end of the function deals with reentering the host. + * On the enter path, only x0 (vcpu pointer) must be preserved until + * the last moment. On the exit path, x0 (vcpu pointer) and x1 (exception + * code) must both be preserved until the epilogue. + * In both cases, x2 points to the CPU context we're saving/restoring from/to. + */ +ENTRY(__kvm_vcpu_run) + kern_hyp_va x0 + msr tpidr_el2, x0 // Save the vcpu register + + // Host context + ldr x2, [x0, #VCPU_HOST_CONTEXT] + kern_hyp_va x2 + + save_host_regs + bl __save_fpsimd + bl __save_sysregs + + activate_traps + activate_vm + + restore_vgic_state + restore_timer_state + + // Guest context + add x2, x0, #VCPU_CONTEXT + + bl __restore_sysregs + bl __restore_fpsimd + restore_guest_32bit_state + restore_guest_regs + + // That's it, no more messing around. + eret + +__kvm_vcpu_return: + // Assume x0 is the vcpu pointer, x1 the return code + // Guest's x0-x3 are on the stack + + // Guest context + add x2, x0, #VCPU_CONTEXT + + save_guest_regs + bl __save_fpsimd + bl __save_sysregs + save_guest_32bit_state + + save_timer_state + save_vgic_state + + deactivate_traps + deactivate_vm + + // Host context + ldr x2, [x0, #VCPU_HOST_CONTEXT] + kern_hyp_va x2 + + bl __restore_sysregs + bl __restore_fpsimd + restore_host_regs + + mov x0, x1 + ret +END(__kvm_vcpu_run) + +// void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa); +ENTRY(__kvm_tlb_flush_vmid_ipa) + kern_hyp_va x0 + ldr x2, [x0, #KVM_VTTBR] + msr vttbr_el2, x2 + isb + + /* + * We could do so much better if we had the VA as well. + * Instead, we invalidate Stage-2 for this IPA, and the + * whole of Stage-1. Weep... + */ + tlbi ipas2e1is, x1 + dsb sy + tlbi vmalle1is + dsb sy + isb + + msr vttbr_el2, xzr + ret +ENDPROC(__kvm_tlb_flush_vmid_ipa) + +ENTRY(__kvm_flush_vm_context) + tlbi alle1is + ic ialluis + dsb sy + ret +ENDPROC(__kvm_flush_vm_context) + +__kvm_hyp_panic: + // Guess the context by looking at VTTBR: + // If zero, then we're already a host. + // Otherwise restore a minimal host context before panicing. + mrs x0, vttbr_el2 + cbz x0, 1f + + mrs x0, tpidr_el2 + + deactivate_traps + deactivate_vm + + ldr x2, [x0, #VCPU_HOST_CONTEXT] + kern_hyp_va x2 + + bl __restore_sysregs + +1: adr x0, __hyp_panic_str + adr x1, 2f + ldp x2, x3, [x1] + sub x0, x0, x2 + add x0, x0, x3 + mrs x1, spsr_el2 + mrs x2, elr_el2 + mrs x3, esr_el2 + mrs x4, far_el2 + mrs x5, hpfar_el2 + mrs x6, par_el1 + mrs x7, tpidr_el2 + + mov lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\ + PSR_MODE_EL1h) + msr spsr_el2, lr + ldr lr, =panic + msr elr_el2, lr + eret + + .align 3 +2: .quad HYP_PAGE_OFFSET + .quad PAGE_OFFSET +ENDPROC(__kvm_hyp_panic) + +__hyp_panic_str: + .ascii "HYP panic:\nPS:%08x PC:%p ESR:%p\nFAR:%p HPFAR:%p PAR:%p\nVCPU:%p\n\0" + + .align 2 + +ENTRY(kvm_call_hyp) + hvc #0 + ret +ENDPROC(kvm_call_hyp) + +.macro invalid_vector label, target + .align 2 +\label: + b \target +ENDPROC(\label) +.endm + + /* None of these should ever happen */ + invalid_vector el2t_sync_invalid, __kvm_hyp_panic + invalid_vector el2t_irq_invalid, __kvm_hyp_panic + invalid_vector el2t_fiq_invalid, __kvm_hyp_panic + invalid_vector el2t_error_invalid, __kvm_hyp_panic + invalid_vector el2h_sync_invalid, __kvm_hyp_panic + invalid_vector el2h_irq_invalid, __kvm_hyp_panic + invalid_vector el2h_fiq_invalid, __kvm_hyp_panic + invalid_vector el2h_error_invalid, __kvm_hyp_panic + invalid_vector el1_sync_invalid, __kvm_hyp_panic + invalid_vector el1_irq_invalid, __kvm_hyp_panic + invalid_vector el1_fiq_invalid, __kvm_hyp_panic + invalid_vector el1_error_invalid, __kvm_hyp_panic + +el1_sync: // Guest trapped into EL2 + push x0, x1 + push x2, x3 + + mrs x1, esr_el2 + lsr x2, x1, #ESR_EL2_EC_SHIFT + + cmp x2, #ESR_EL2_EC_HVC64 + b.ne el1_trap + + mrs x3, vttbr_el2 // If vttbr is valid, the 64bit guest + cbnz x3, el1_trap // called HVC + + /* Here, we're pretty sure the host called HVC. */ + pop x2, x3 + pop x0, x1 + + push lr, xzr + + /* + * Compute the function address in EL2, and shuffle the parameters. + */ + kern_hyp_va x0 + mov lr, x0 + mov x0, x1 + mov x1, x2 + mov x2, x3 + blr lr + + pop lr, xzr + eret + +el1_trap: + /* + * x1: ESR + * x2: ESR_EC + */ + cmp x2, #ESR_EL2_EC_DABT + mov x0, #ESR_EL2_EC_IABT + ccmp x2, x0, #4, ne + b.ne 1f // Not an abort we care about + + /* This is an abort. Check for permission fault */ + and x2, x1, #ESR_EL2_FSC_TYPE + cmp x2, #FSC_PERM + b.ne 1f // Not a permission fault + + /* + * Check for Stage-1 page table walk, which is guaranteed + * to give a valid HPFAR_EL2. + */ + tbnz x1, #7, 1f // S1PTW is set + + /* + * Permission fault, HPFAR_EL2 is invalid. + * Resolve the IPA the hard way using the guest VA. + * Stage-1 translation already validated the memory access rights. + * As such, we can use the EL1 translation regime, and don't have + * to distinguish between EL0 and EL1 access. + */ + mrs x2, far_el2 + at s1e1r, x2 + isb + + /* Read result */ + mrs x3, par_el1 + tbnz x3, #0, 3f // Bail out if we failed the translation + ubfx x3, x3, #12, #36 // Extract IPA + lsl x3, x3, #4 // and present it like HPFAR + b 2f + +1: mrs x3, hpfar_el2 + mrs x2, far_el2 + +2: mrs x0, tpidr_el2 + str x1, [x0, #VCPU_ESR_EL2] + str x2, [x0, #VCPU_FAR_EL2] + str x3, [x0, #VCPU_HPFAR_EL2] + + mov x1, #ARM_EXCEPTION_TRAP + b __kvm_vcpu_return + + /* + * Translation failed. Just return to the guest and + * let it fault again. Another CPU is probably playing + * behind our back. + */ +3: pop x2, x3 + pop x0, x1 + + eret + +el1_irq: + push x0, x1 + push x2, x3 + mrs x0, tpidr_el2 + mov x1, #ARM_EXCEPTION_IRQ + b __kvm_vcpu_return + + .ltorg + + .align 11 + +ENTRY(__kvm_hyp_vector) + ventry el2t_sync_invalid // Synchronous EL2t + ventry el2t_irq_invalid // IRQ EL2t + ventry el2t_fiq_invalid // FIQ EL2t + ventry el2t_error_invalid // Error EL2t + + ventry el2h_sync_invalid // Synchronous EL2h + ventry el2h_irq_invalid // IRQ EL2h + ventry el2h_fiq_invalid // FIQ EL2h + ventry el2h_error_invalid // Error EL2h + + ventry el1_sync // Synchronous 64-bit EL1 + ventry el1_irq // IRQ 64-bit EL1 + ventry el1_fiq_invalid // FIQ 64-bit EL1 + ventry el1_error_invalid // Error 64-bit EL1 + + ventry el1_sync // Synchronous 32-bit EL1 + ventry el1_irq // IRQ 32-bit EL1 + ventry el1_fiq_invalid // FIQ 32-bit EL1 + ventry el1_error_invalid // Error 32-bit EL1 +ENDPROC(__kvm_hyp_vector) + +__kvm_hyp_code_end: + .globl __kvm_hyp_code_end + + .popsection diff --git a/arch/arm64/kvm/inject_fault.c b/arch/arm64/kvm/inject_fault.c new file mode 100644 index 000000000000..81a02a8762b0 --- /dev/null +++ b/arch/arm64/kvm/inject_fault.c @@ -0,0 +1,203 @@ +/* + * Fault injection for both 32 and 64bit guests. + * + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * Based on arch/arm/kvm/emulate.c + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Author: Christoffer Dall <c.dall@virtualopensystems.com> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/kvm_host.h> +#include <asm/kvm_emulate.h> +#include <asm/esr.h> + +#define PSTATE_FAULT_BITS_64 (PSR_MODE_EL1h | PSR_A_BIT | PSR_F_BIT | \ + PSR_I_BIT | PSR_D_BIT) +#define EL1_EXCEPT_SYNC_OFFSET 0x200 + +static void prepare_fault32(struct kvm_vcpu *vcpu, u32 mode, u32 vect_offset) +{ + unsigned long cpsr; + unsigned long new_spsr_value = *vcpu_cpsr(vcpu); + bool is_thumb = (new_spsr_value & COMPAT_PSR_T_BIT); + u32 return_offset = (is_thumb) ? 4 : 0; + u32 sctlr = vcpu_cp15(vcpu, c1_SCTLR); + + cpsr = mode | COMPAT_PSR_I_BIT; + + if (sctlr & (1 << 30)) + cpsr |= COMPAT_PSR_T_BIT; + if (sctlr & (1 << 25)) + cpsr |= COMPAT_PSR_E_BIT; + + *vcpu_cpsr(vcpu) = cpsr; + + /* Note: These now point to the banked copies */ + *vcpu_spsr(vcpu) = new_spsr_value; + *vcpu_reg(vcpu, 14) = *vcpu_pc(vcpu) + return_offset; + + /* Branch to exception vector */ + if (sctlr & (1 << 13)) + vect_offset += 0xffff0000; + else /* always have security exceptions */ + vect_offset += vcpu_cp15(vcpu, c12_VBAR); + + *vcpu_pc(vcpu) = vect_offset; +} + +static void inject_undef32(struct kvm_vcpu *vcpu) +{ + prepare_fault32(vcpu, COMPAT_PSR_MODE_UND, 4); +} + +/* + * Modelled after TakeDataAbortException() and TakePrefetchAbortException + * pseudocode. + */ +static void inject_abt32(struct kvm_vcpu *vcpu, bool is_pabt, + unsigned long addr) +{ + u32 vect_offset; + u32 *far, *fsr; + bool is_lpae; + + if (is_pabt) { + vect_offset = 12; + far = &vcpu_cp15(vcpu, c6_IFAR); + fsr = &vcpu_cp15(vcpu, c5_IFSR); + } else { /* !iabt */ + vect_offset = 16; + far = &vcpu_cp15(vcpu, c6_DFAR); + fsr = &vcpu_cp15(vcpu, c5_DFSR); + } + + prepare_fault32(vcpu, COMPAT_PSR_MODE_ABT | COMPAT_PSR_A_BIT, vect_offset); + + *far = addr; + + /* Give the guest an IMPLEMENTATION DEFINED exception */ + is_lpae = (vcpu_cp15(vcpu, c2_TTBCR) >> 31); + if (is_lpae) + *fsr = 1 << 9 | 0x34; + else + *fsr = 0x14; +} + +static void inject_abt64(struct kvm_vcpu *vcpu, bool is_iabt, unsigned long addr) +{ + unsigned long cpsr = *vcpu_cpsr(vcpu); + bool is_aarch32; + u32 esr = 0; + + is_aarch32 = vcpu_mode_is_32bit(vcpu); + + *vcpu_spsr(vcpu) = cpsr; + *vcpu_elr_el1(vcpu) = *vcpu_pc(vcpu); + + *vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64; + *vcpu_pc(vcpu) = vcpu_sys_reg(vcpu, VBAR_EL1) + EL1_EXCEPT_SYNC_OFFSET; + + vcpu_sys_reg(vcpu, FAR_EL1) = addr; + + /* + * Build an {i,d}abort, depending on the level and the + * instruction set. Report an external synchronous abort. + */ + if (kvm_vcpu_trap_il_is32bit(vcpu)) + esr |= ESR_EL1_IL; + + /* + * Here, the guest runs in AArch64 mode when in EL1. If we get + * an AArch32 fault, it means we managed to trap an EL0 fault. + */ + if (is_aarch32 || (cpsr & PSR_MODE_MASK) == PSR_MODE_EL0t) + esr |= (ESR_EL1_EC_IABT_EL0 << ESR_EL1_EC_SHIFT); + else + esr |= (ESR_EL1_EC_IABT_EL1 << ESR_EL1_EC_SHIFT); + + if (!is_iabt) + esr |= ESR_EL1_EC_DABT_EL0; + + vcpu_sys_reg(vcpu, ESR_EL1) = esr | ESR_EL2_EC_xABT_xFSR_EXTABT; +} + +static void inject_undef64(struct kvm_vcpu *vcpu) +{ + unsigned long cpsr = *vcpu_cpsr(vcpu); + u32 esr = (ESR_EL1_EC_UNKNOWN << ESR_EL1_EC_SHIFT); + + *vcpu_spsr(vcpu) = cpsr; + *vcpu_elr_el1(vcpu) = *vcpu_pc(vcpu); + + *vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64; + *vcpu_pc(vcpu) = vcpu_sys_reg(vcpu, VBAR_EL1) + EL1_EXCEPT_SYNC_OFFSET; + + /* + * Build an unknown exception, depending on the instruction + * set. + */ + if (kvm_vcpu_trap_il_is32bit(vcpu)) + esr |= ESR_EL1_IL; + + vcpu_sys_reg(vcpu, ESR_EL1) = esr; +} + +/** + * kvm_inject_dabt - inject a data abort into the guest + * @vcpu: The VCPU to receive the undefined exception + * @addr: The address to report in the DFAR + * + * It is assumed that this code is called from the VCPU thread and that the + * VCPU therefore is not currently executing guest code. + */ +void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr) +{ + if (!(vcpu->arch.hcr_el2 & HCR_RW)) + inject_abt32(vcpu, false, addr); + + inject_abt64(vcpu, false, addr); +} + +/** + * kvm_inject_pabt - inject a prefetch abort into the guest + * @vcpu: The VCPU to receive the undefined exception + * @addr: The address to report in the DFAR + * + * It is assumed that this code is called from the VCPU thread and that the + * VCPU therefore is not currently executing guest code. + */ +void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr) +{ + if (!(vcpu->arch.hcr_el2 & HCR_RW)) + inject_abt32(vcpu, true, addr); + + inject_abt64(vcpu, true, addr); +} + +/** + * kvm_inject_undefined - inject an undefined instruction into the guest + * + * It is assumed that this code is called from the VCPU thread and that the + * VCPU therefore is not currently executing guest code. + */ +void kvm_inject_undefined(struct kvm_vcpu *vcpu) +{ + if (!(vcpu->arch.hcr_el2 & HCR_RW)) + inject_undef32(vcpu); + + inject_undef64(vcpu); +} diff --git a/arch/arm64/kvm/regmap.c b/arch/arm64/kvm/regmap.c new file mode 100644 index 000000000000..bbc6ae32e4af --- /dev/null +++ b/arch/arm64/kvm/regmap.c @@ -0,0 +1,168 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * Derived from arch/arm/kvm/emulate.c: + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Author: Christoffer Dall <c.dall@virtualopensystems.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/mm.h> +#include <linux/kvm_host.h> +#include <asm/kvm_emulate.h> +#include <asm/ptrace.h> + +#define VCPU_NR_MODES 6 +#define REG_OFFSET(_reg) \ + (offsetof(struct user_pt_regs, _reg) / sizeof(unsigned long)) + +#define USR_REG_OFFSET(R) REG_OFFSET(compat_usr(R)) + +static const unsigned long vcpu_reg_offsets[VCPU_NR_MODES][16] = { + /* USR Registers */ + { + USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2), + USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5), + USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8), + USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11), + USR_REG_OFFSET(12), USR_REG_OFFSET(13), USR_REG_OFFSET(14), + REG_OFFSET(pc) + }, + + /* FIQ Registers */ + { + USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2), + USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5), + USR_REG_OFFSET(6), USR_REG_OFFSET(7), + REG_OFFSET(compat_r8_fiq), /* r8 */ + REG_OFFSET(compat_r9_fiq), /* r9 */ + REG_OFFSET(compat_r10_fiq), /* r10 */ + REG_OFFSET(compat_r11_fiq), /* r11 */ + REG_OFFSET(compat_r12_fiq), /* r12 */ + REG_OFFSET(compat_sp_fiq), /* r13 */ + REG_OFFSET(compat_lr_fiq), /* r14 */ + REG_OFFSET(pc) + }, + + /* IRQ Registers */ + { + USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2), + USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5), + USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8), + USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11), + USR_REG_OFFSET(12), + REG_OFFSET(compat_sp_irq), /* r13 */ + REG_OFFSET(compat_lr_irq), /* r14 */ + REG_OFFSET(pc) + }, + + /* SVC Registers */ + { + USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2), + USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5), + USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8), + USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11), + USR_REG_OFFSET(12), + REG_OFFSET(compat_sp_svc), /* r13 */ + REG_OFFSET(compat_lr_svc), /* r14 */ + REG_OFFSET(pc) + }, + + /* ABT Registers */ + { + USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2), + USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5), + USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8), + USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11), + USR_REG_OFFSET(12), + REG_OFFSET(compat_sp_abt), /* r13 */ + REG_OFFSET(compat_lr_abt), /* r14 */ + REG_OFFSET(pc) + }, + + /* UND Registers */ + { + USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2), + USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5), + USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8), + USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11), + USR_REG_OFFSET(12), + REG_OFFSET(compat_sp_und), /* r13 */ + REG_OFFSET(compat_lr_und), /* r14 */ + REG_OFFSET(pc) + }, +}; + +/* + * Return a pointer to the register number valid in the current mode of + * the virtual CPU. + */ +unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num) +{ + unsigned long *reg_array = (unsigned long *)&vcpu->arch.ctxt.gp_regs.regs; + unsigned long mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK; + + switch (mode) { + case COMPAT_PSR_MODE_USR ... COMPAT_PSR_MODE_SVC: + mode &= ~PSR_MODE32_BIT; /* 0 ... 3 */ + break; + + case COMPAT_PSR_MODE_ABT: + mode = 4; + break; + + case COMPAT_PSR_MODE_UND: + mode = 5; + break; + + case COMPAT_PSR_MODE_SYS: + mode = 0; /* SYS maps to USR */ + break; + + default: + BUG(); + } + + return reg_array + vcpu_reg_offsets[mode][reg_num]; +} + +/* + * Return the SPSR for the current mode of the virtual CPU. + */ +unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu) +{ + unsigned long mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK; + switch (mode) { + case COMPAT_PSR_MODE_SVC: + mode = KVM_SPSR_SVC; + break; + case COMPAT_PSR_MODE_ABT: + mode = KVM_SPSR_ABT; + break; + case COMPAT_PSR_MODE_UND: + mode = KVM_SPSR_UND; + break; + case COMPAT_PSR_MODE_IRQ: + mode = KVM_SPSR_IRQ; + break; + case COMPAT_PSR_MODE_FIQ: + mode = KVM_SPSR_FIQ; + break; + default: + BUG(); + } + + return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[mode]; +} diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c new file mode 100644 index 000000000000..70a7816535cd --- /dev/null +++ b/arch/arm64/kvm/reset.c @@ -0,0 +1,112 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * Derived from arch/arm/kvm/reset.c + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Author: Christoffer Dall <c.dall@virtualopensystems.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/errno.h> +#include <linux/kvm_host.h> +#include <linux/kvm.h> + +#include <kvm/arm_arch_timer.h> + +#include <asm/cputype.h> +#include <asm/ptrace.h> +#include <asm/kvm_arm.h> +#include <asm/kvm_coproc.h> + +/* + * ARMv8 Reset Values + */ +static const struct kvm_regs default_regs_reset = { + .regs.pstate = (PSR_MODE_EL1h | PSR_A_BIT | PSR_I_BIT | + PSR_F_BIT | PSR_D_BIT), +}; + +static const struct kvm_regs default_regs_reset32 = { + .regs.pstate = (COMPAT_PSR_MODE_SVC | COMPAT_PSR_A_BIT | + COMPAT_PSR_I_BIT | COMPAT_PSR_F_BIT), +}; + +static const struct kvm_irq_level default_vtimer_irq = { + .irq = 27, + .level = 1, +}; + +static bool cpu_has_32bit_el1(void) +{ + u64 pfr0; + + pfr0 = read_cpuid(ID_AA64PFR0_EL1); + return !!(pfr0 & 0x20); +} + +int kvm_arch_dev_ioctl_check_extension(long ext) +{ + int r; + + switch (ext) { + case KVM_CAP_ARM_EL1_32BIT: + r = cpu_has_32bit_el1(); + break; + default: + r = 0; + } + + return r; +} + +/** + * kvm_reset_vcpu - sets core registers and sys_regs to reset value + * @vcpu: The VCPU pointer + * + * This function finds the right table above and sets the registers on + * the virtual CPU struct to their architectually defined reset + * values. + */ +int kvm_reset_vcpu(struct kvm_vcpu *vcpu) +{ + const struct kvm_irq_level *cpu_vtimer_irq; + const struct kvm_regs *cpu_reset; + + switch (vcpu->arch.target) { + default: + if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) { + if (!cpu_has_32bit_el1()) + return -EINVAL; + cpu_reset = &default_regs_reset32; + vcpu->arch.hcr_el2 &= ~HCR_RW; + } else { + cpu_reset = &default_regs_reset; + } + + cpu_vtimer_irq = &default_vtimer_irq; + break; + } + + /* Reset core registers */ + memcpy(vcpu_gp_regs(vcpu), cpu_reset, sizeof(*cpu_reset)); + + /* Reset system registers */ + kvm_reset_sys_regs(vcpu); + + /* Reset timer */ + kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq); + + return 0; +} diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c new file mode 100644 index 000000000000..94923609753b --- /dev/null +++ b/arch/arm64/kvm/sys_regs.c @@ -0,0 +1,1050 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * Derived from arch/arm/kvm/coproc.c: + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Authors: Rusty Russell <rusty@rustcorp.com.au> + * Christoffer Dall <c.dall@virtualopensystems.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/mm.h> +#include <linux/kvm_host.h> +#include <linux/uaccess.h> +#include <asm/kvm_arm.h> +#include <asm/kvm_host.h> +#include <asm/kvm_emulate.h> +#include <asm/kvm_coproc.h> +#include <asm/cacheflush.h> +#include <asm/cputype.h> +#include <trace/events/kvm.h> + +#include "sys_regs.h" + +/* + * All of this file is extremly similar to the ARM coproc.c, but the + * types are different. My gut feeling is that it should be pretty + * easy to merge, but that would be an ABI breakage -- again. VFP + * would also need to be abstracted. + * + * For AArch32, we only take care of what is being trapped. Anything + * that has to do with init and userspace access has to go via the + * 64bit interface. + */ + +/* 3 bits per cache level, as per CLIDR, but non-existent caches always 0 */ +static u32 cache_levels; + +/* CSSELR values; used to index KVM_REG_ARM_DEMUX_ID_CCSIDR */ +#define CSSELR_MAX 12 + +/* Which cache CCSIDR represents depends on CSSELR value. */ +static u32 get_ccsidr(u32 csselr) +{ + u32 ccsidr; + + /* Make sure noone else changes CSSELR during this! */ + local_irq_disable(); + /* Put value into CSSELR */ + asm volatile("msr csselr_el1, %x0" : : "r" (csselr)); + isb(); + /* Read result out of CCSIDR */ + asm volatile("mrs %0, ccsidr_el1" : "=r" (ccsidr)); + local_irq_enable(); + + return ccsidr; +} + +static void do_dc_cisw(u32 val) +{ + asm volatile("dc cisw, %x0" : : "r" (val)); + dsb(); +} + +static void do_dc_csw(u32 val) +{ + asm volatile("dc csw, %x0" : : "r" (val)); + dsb(); +} + +/* See note at ARM ARM B1.14.4 */ +static bool access_dcsw(struct kvm_vcpu *vcpu, + const struct sys_reg_params *p, + const struct sys_reg_desc *r) +{ + unsigned long val; + int cpu; + + if (!p->is_write) + return read_from_write_only(vcpu, p); + + cpu = get_cpu(); + + cpumask_setall(&vcpu->arch.require_dcache_flush); + cpumask_clear_cpu(cpu, &vcpu->arch.require_dcache_flush); + + /* If we were already preempted, take the long way around */ + if (cpu != vcpu->arch.last_pcpu) { + flush_cache_all(); + goto done; + } + + val = *vcpu_reg(vcpu, p->Rt); + + switch (p->CRm) { + case 6: /* Upgrade DCISW to DCCISW, as per HCR.SWIO */ + case 14: /* DCCISW */ + do_dc_cisw(val); + break; + + case 10: /* DCCSW */ + do_dc_csw(val); + break; + } + +done: + put_cpu(); + + return true; +} + +/* + * We could trap ID_DFR0 and tell the guest we don't support performance + * monitoring. Unfortunately the patch to make the kernel check ID_DFR0 was + * NAKed, so it will read the PMCR anyway. + * + * Therefore we tell the guest we have 0 counters. Unfortunately, we + * must always support PMCCNTR (the cycle counter): we just RAZ/WI for + * all PM registers, which doesn't crash the guest kernel at least. + */ +static bool pm_fake(struct kvm_vcpu *vcpu, + const struct sys_reg_params *p, + const struct sys_reg_desc *r) +{ + if (p->is_write) + return ignore_write(vcpu, p); + else + return read_zero(vcpu, p); +} + +static void reset_amair_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) +{ + u64 amair; + + asm volatile("mrs %0, amair_el1\n" : "=r" (amair)); + vcpu_sys_reg(vcpu, AMAIR_EL1) = amair; +} + +static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) +{ + /* + * Simply map the vcpu_id into the Aff0 field of the MPIDR. + */ + vcpu_sys_reg(vcpu, MPIDR_EL1) = (1UL << 31) | (vcpu->vcpu_id & 0xff); +} + +/* + * Architected system registers. + * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2 + */ +static const struct sys_reg_desc sys_reg_descs[] = { + /* DC ISW */ + { Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b0110), Op2(0b010), + access_dcsw }, + /* DC CSW */ + { Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b1010), Op2(0b010), + access_dcsw }, + /* DC CISW */ + { Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b1110), Op2(0b010), + access_dcsw }, + + /* TEECR32_EL1 */ + { Op0(0b10), Op1(0b010), CRn(0b0000), CRm(0b0000), Op2(0b000), + NULL, reset_val, TEECR32_EL1, 0 }, + /* TEEHBR32_EL1 */ + { Op0(0b10), Op1(0b010), CRn(0b0001), CRm(0b0000), Op2(0b000), + NULL, reset_val, TEEHBR32_EL1, 0 }, + /* DBGVCR32_EL2 */ + { Op0(0b10), Op1(0b100), CRn(0b0000), CRm(0b0111), Op2(0b000), + NULL, reset_val, DBGVCR32_EL2, 0 }, + + /* MPIDR_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0000), Op2(0b101), + NULL, reset_mpidr, MPIDR_EL1 }, + /* SCTLR_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b000), + NULL, reset_val, SCTLR_EL1, 0x00C50078 }, + /* CPACR_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b010), + NULL, reset_val, CPACR_EL1, 0 }, + /* TTBR0_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b0010), CRm(0b0000), Op2(0b000), + NULL, reset_unknown, TTBR0_EL1 }, + /* TTBR1_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b0010), CRm(0b0000), Op2(0b001), + NULL, reset_unknown, TTBR1_EL1 }, + /* TCR_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b0010), CRm(0b0000), Op2(0b010), + NULL, reset_val, TCR_EL1, 0 }, + + /* AFSR0_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b0101), CRm(0b0001), Op2(0b000), + NULL, reset_unknown, AFSR0_EL1 }, + /* AFSR1_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b0101), CRm(0b0001), Op2(0b001), + NULL, reset_unknown, AFSR1_EL1 }, + /* ESR_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b0101), CRm(0b0010), Op2(0b000), + NULL, reset_unknown, ESR_EL1 }, + /* FAR_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b0110), CRm(0b0000), Op2(0b000), + NULL, reset_unknown, FAR_EL1 }, + + /* PMINTENSET_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b1001), CRm(0b1110), Op2(0b001), + pm_fake }, + /* PMINTENCLR_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b1001), CRm(0b1110), Op2(0b010), + pm_fake }, + + /* MAIR_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b1010), CRm(0b0010), Op2(0b000), + NULL, reset_unknown, MAIR_EL1 }, + /* AMAIR_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b1010), CRm(0b0011), Op2(0b000), + NULL, reset_amair_el1, AMAIR_EL1 }, + + /* VBAR_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b1100), CRm(0b0000), Op2(0b000), + NULL, reset_val, VBAR_EL1, 0 }, + /* CONTEXTIDR_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b1101), CRm(0b0000), Op2(0b001), + NULL, reset_val, CONTEXTIDR_EL1, 0 }, + /* TPIDR_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b1101), CRm(0b0000), Op2(0b100), + NULL, reset_unknown, TPIDR_EL1 }, + + /* CNTKCTL_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b1110), CRm(0b0001), Op2(0b000), + NULL, reset_val, CNTKCTL_EL1, 0}, + + /* CSSELR_EL1 */ + { Op0(0b11), Op1(0b010), CRn(0b0000), CRm(0b0000), Op2(0b000), + NULL, reset_unknown, CSSELR_EL1 }, + + /* PMCR_EL0 */ + { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b000), + pm_fake }, + /* PMCNTENSET_EL0 */ + { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b001), + pm_fake }, + /* PMCNTENCLR_EL0 */ + { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b010), + pm_fake }, + /* PMOVSCLR_EL0 */ + { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b011), + pm_fake }, + /* PMSWINC_EL0 */ + { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b100), + pm_fake }, + /* PMSELR_EL0 */ + { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b101), + pm_fake }, + /* PMCEID0_EL0 */ + { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b110), + pm_fake }, + /* PMCEID1_EL0 */ + { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b111), + pm_fake }, + /* PMCCNTR_EL0 */ + { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b000), + pm_fake }, + /* PMXEVTYPER_EL0 */ + { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b001), + pm_fake }, + /* PMXEVCNTR_EL0 */ + { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b010), + pm_fake }, + /* PMUSERENR_EL0 */ + { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1110), Op2(0b000), + pm_fake }, + /* PMOVSSET_EL0 */ + { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1110), Op2(0b011), + pm_fake }, + + /* TPIDR_EL0 */ + { Op0(0b11), Op1(0b011), CRn(0b1101), CRm(0b0000), Op2(0b010), + NULL, reset_unknown, TPIDR_EL0 }, + /* TPIDRRO_EL0 */ + { Op0(0b11), Op1(0b011), CRn(0b1101), CRm(0b0000), Op2(0b011), + NULL, reset_unknown, TPIDRRO_EL0 }, + + /* DACR32_EL2 */ + { Op0(0b11), Op1(0b100), CRn(0b0011), CRm(0b0000), Op2(0b000), + NULL, reset_unknown, DACR32_EL2 }, + /* IFSR32_EL2 */ + { Op0(0b11), Op1(0b100), CRn(0b0101), CRm(0b0000), Op2(0b001), + NULL, reset_unknown, IFSR32_EL2 }, + /* FPEXC32_EL2 */ + { Op0(0b11), Op1(0b100), CRn(0b0101), CRm(0b0011), Op2(0b000), + NULL, reset_val, FPEXC32_EL2, 0x70 }, +}; + +/* Trapped cp15 registers */ +static const struct sys_reg_desc cp15_regs[] = { + /* + * DC{C,I,CI}SW operations: + */ + { Op1( 0), CRn( 7), CRm( 6), Op2( 2), access_dcsw }, + { Op1( 0), CRn( 7), CRm(10), Op2( 2), access_dcsw }, + { Op1( 0), CRn( 7), CRm(14), Op2( 2), access_dcsw }, + { Op1( 0), CRn( 9), CRm(12), Op2( 0), pm_fake }, + { Op1( 0), CRn( 9), CRm(12), Op2( 1), pm_fake }, + { Op1( 0), CRn( 9), CRm(12), Op2( 2), pm_fake }, + { Op1( 0), CRn( 9), CRm(12), Op2( 3), pm_fake }, + { Op1( 0), CRn( 9), CRm(12), Op2( 5), pm_fake }, + { Op1( 0), CRn( 9), CRm(12), Op2( 6), pm_fake }, + { Op1( 0), CRn( 9), CRm(12), Op2( 7), pm_fake }, + { Op1( 0), CRn( 9), CRm(13), Op2( 0), pm_fake }, + { Op1( 0), CRn( 9), CRm(13), Op2( 1), pm_fake }, + { Op1( 0), CRn( 9), CRm(13), Op2( 2), pm_fake }, + { Op1( 0), CRn( 9), CRm(14), Op2( 0), pm_fake }, + { Op1( 0), CRn( 9), CRm(14), Op2( 1), pm_fake }, + { Op1( 0), CRn( 9), CRm(14), Op2( 2), pm_fake }, +}; + +/* Target specific emulation tables */ +static struct kvm_sys_reg_target_table *target_tables[KVM_ARM_NUM_TARGETS]; + +void kvm_register_target_sys_reg_table(unsigned int target, + struct kvm_sys_reg_target_table *table) +{ + target_tables[target] = table; +} + +/* Get specific register table for this target. */ +static const struct sys_reg_desc *get_target_table(unsigned target, + bool mode_is_64, + size_t *num) +{ + struct kvm_sys_reg_target_table *table; + + table = target_tables[target]; + if (mode_is_64) { + *num = table->table64.num; + return table->table64.table; + } else { + *num = table->table32.num; + return table->table32.table; + } +} + +static const struct sys_reg_desc *find_reg(const struct sys_reg_params *params, + const struct sys_reg_desc table[], + unsigned int num) +{ + unsigned int i; + + for (i = 0; i < num; i++) { + const struct sys_reg_desc *r = &table[i]; + + if (params->Op0 != r->Op0) + continue; + if (params->Op1 != r->Op1) + continue; + if (params->CRn != r->CRn) + continue; + if (params->CRm != r->CRm) + continue; + if (params->Op2 != r->Op2) + continue; + + return r; + } + return NULL; +} + +int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + kvm_inject_undefined(vcpu); + return 1; +} + +int kvm_handle_cp14_access(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + kvm_inject_undefined(vcpu); + return 1; +} + +static void emulate_cp15(struct kvm_vcpu *vcpu, + const struct sys_reg_params *params) +{ + size_t num; + const struct sys_reg_desc *table, *r; + + table = get_target_table(vcpu->arch.target, false, &num); + + /* Search target-specific then generic table. */ + r = find_reg(params, table, num); + if (!r) + r = find_reg(params, cp15_regs, ARRAY_SIZE(cp15_regs)); + + if (likely(r)) { + /* + * Not having an accessor means that we have + * configured a trap that we don't know how to + * handle. This certainly qualifies as a gross bug + * that should be fixed right away. + */ + BUG_ON(!r->access); + + if (likely(r->access(vcpu, params, r))) { + /* Skip instruction, since it was emulated */ + kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); + return; + } + /* If access function fails, it should complain. */ + } + + kvm_err("Unsupported guest CP15 access at: %08lx\n", *vcpu_pc(vcpu)); + print_sys_reg_instr(params); + kvm_inject_undefined(vcpu); +} + +/** + * kvm_handle_cp15_64 -- handles a mrrc/mcrr trap on a guest CP15 access + * @vcpu: The VCPU pointer + * @run: The kvm_run struct + */ +int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + struct sys_reg_params params; + u32 hsr = kvm_vcpu_get_hsr(vcpu); + int Rt2 = (hsr >> 10) & 0xf; + + params.CRm = (hsr >> 1) & 0xf; + params.Rt = (hsr >> 5) & 0xf; + params.is_write = ((hsr & 1) == 0); + + params.Op0 = 0; + params.Op1 = (hsr >> 16) & 0xf; + params.Op2 = 0; + params.CRn = 0; + + /* + * Massive hack here. Store Rt2 in the top 32bits so we only + * have one register to deal with. As we use the same trap + * backends between AArch32 and AArch64, we get away with it. + */ + if (params.is_write) { + u64 val = *vcpu_reg(vcpu, params.Rt); + val &= 0xffffffff; + val |= *vcpu_reg(vcpu, Rt2) << 32; + *vcpu_reg(vcpu, params.Rt) = val; + } + + emulate_cp15(vcpu, ¶ms); + + /* Do the opposite hack for the read side */ + if (!params.is_write) { + u64 val = *vcpu_reg(vcpu, params.Rt); + val >>= 32; + *vcpu_reg(vcpu, Rt2) = val; + } + + return 1; +} + +/** + * kvm_handle_cp15_32 -- handles a mrc/mcr trap on a guest CP15 access + * @vcpu: The VCPU pointer + * @run: The kvm_run struct + */ +int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + struct sys_reg_params params; + u32 hsr = kvm_vcpu_get_hsr(vcpu); + + params.CRm = (hsr >> 1) & 0xf; + params.Rt = (hsr >> 5) & 0xf; + params.is_write = ((hsr & 1) == 0); + params.CRn = (hsr >> 10) & 0xf; + params.Op0 = 0; + params.Op1 = (hsr >> 14) & 0x7; + params.Op2 = (hsr >> 17) & 0x7; + + emulate_cp15(vcpu, ¶ms); + return 1; +} + +static int emulate_sys_reg(struct kvm_vcpu *vcpu, + const struct sys_reg_params *params) +{ + size_t num; + const struct sys_reg_desc *table, *r; + + table = get_target_table(vcpu->arch.target, true, &num); + + /* Search target-specific then generic table. */ + r = find_reg(params, table, num); + if (!r) + r = find_reg(params, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); + + if (likely(r)) { + /* + * Not having an accessor means that we have + * configured a trap that we don't know how to + * handle. This certainly qualifies as a gross bug + * that should be fixed right away. + */ + BUG_ON(!r->access); + + if (likely(r->access(vcpu, params, r))) { + /* Skip instruction, since it was emulated */ + kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); + return 1; + } + /* If access function fails, it should complain. */ + } else { + kvm_err("Unsupported guest sys_reg access at: %lx\n", + *vcpu_pc(vcpu)); + print_sys_reg_instr(params); + } + kvm_inject_undefined(vcpu); + return 1; +} + +static void reset_sys_reg_descs(struct kvm_vcpu *vcpu, + const struct sys_reg_desc *table, size_t num) +{ + unsigned long i; + + for (i = 0; i < num; i++) + if (table[i].reset) + table[i].reset(vcpu, &table[i]); +} + +/** + * kvm_handle_sys_reg -- handles a mrs/msr trap on a guest sys_reg access + * @vcpu: The VCPU pointer + * @run: The kvm_run struct + */ +int kvm_handle_sys_reg(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + struct sys_reg_params params; + unsigned long esr = kvm_vcpu_get_hsr(vcpu); + + params.Op0 = (esr >> 20) & 3; + params.Op1 = (esr >> 14) & 0x7; + params.CRn = (esr >> 10) & 0xf; + params.CRm = (esr >> 1) & 0xf; + params.Op2 = (esr >> 17) & 0x7; + params.Rt = (esr >> 5) & 0x1f; + params.is_write = !(esr & 1); + + return emulate_sys_reg(vcpu, ¶ms); +} + +/****************************************************************************** + * Userspace API + *****************************************************************************/ + +static bool index_to_params(u64 id, struct sys_reg_params *params) +{ + switch (id & KVM_REG_SIZE_MASK) { + case KVM_REG_SIZE_U64: + /* Any unused index bits means it's not valid. */ + if (id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK + | KVM_REG_ARM_COPROC_MASK + | KVM_REG_ARM64_SYSREG_OP0_MASK + | KVM_REG_ARM64_SYSREG_OP1_MASK + | KVM_REG_ARM64_SYSREG_CRN_MASK + | KVM_REG_ARM64_SYSREG_CRM_MASK + | KVM_REG_ARM64_SYSREG_OP2_MASK)) + return false; + params->Op0 = ((id & KVM_REG_ARM64_SYSREG_OP0_MASK) + >> KVM_REG_ARM64_SYSREG_OP0_SHIFT); + params->Op1 = ((id & KVM_REG_ARM64_SYSREG_OP1_MASK) + >> KVM_REG_ARM64_SYSREG_OP1_SHIFT); + params->CRn = ((id & KVM_REG_ARM64_SYSREG_CRN_MASK) + >> KVM_REG_ARM64_SYSREG_CRN_SHIFT); + params->CRm = ((id & KVM_REG_ARM64_SYSREG_CRM_MASK) + >> KVM_REG_ARM64_SYSREG_CRM_SHIFT); + params->Op2 = ((id & KVM_REG_ARM64_SYSREG_OP2_MASK) + >> KVM_REG_ARM64_SYSREG_OP2_SHIFT); + return true; + default: + return false; + } +} + +/* Decode an index value, and find the sys_reg_desc entry. */ +static const struct sys_reg_desc *index_to_sys_reg_desc(struct kvm_vcpu *vcpu, + u64 id) +{ + size_t num; + const struct sys_reg_desc *table, *r; + struct sys_reg_params params; + + /* We only do sys_reg for now. */ + if ((id & KVM_REG_ARM_COPROC_MASK) != KVM_REG_ARM64_SYSREG) + return NULL; + + if (!index_to_params(id, ¶ms)) + return NULL; + + table = get_target_table(vcpu->arch.target, true, &num); + r = find_reg(¶ms, table, num); + if (!r) + r = find_reg(¶ms, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); + + /* Not saved in the sys_reg array? */ + if (r && !r->reg) + r = NULL; + + return r; +} + +/* + * These are the invariant sys_reg registers: we let the guest see the + * host versions of these, so they're part of the guest state. + * + * A future CPU may provide a mechanism to present different values to + * the guest, or a future kvm may trap them. + */ + +#define FUNCTION_INVARIANT(reg) \ + static void get_##reg(struct kvm_vcpu *v, \ + const struct sys_reg_desc *r) \ + { \ + u64 val; \ + \ + asm volatile("mrs %0, " __stringify(reg) "\n" \ + : "=r" (val)); \ + ((struct sys_reg_desc *)r)->val = val; \ + } + +FUNCTION_INVARIANT(midr_el1) +FUNCTION_INVARIANT(ctr_el0) +FUNCTION_INVARIANT(revidr_el1) +FUNCTION_INVARIANT(id_pfr0_el1) +FUNCTION_INVARIANT(id_pfr1_el1) +FUNCTION_INVARIANT(id_dfr0_el1) +FUNCTION_INVARIANT(id_afr0_el1) +FUNCTION_INVARIANT(id_mmfr0_el1) +FUNCTION_INVARIANT(id_mmfr1_el1) +FUNCTION_INVARIANT(id_mmfr2_el1) +FUNCTION_INVARIANT(id_mmfr3_el1) +FUNCTION_INVARIANT(id_isar0_el1) +FUNCTION_INVARIANT(id_isar1_el1) +FUNCTION_INVARIANT(id_isar2_el1) +FUNCTION_INVARIANT(id_isar3_el1) +FUNCTION_INVARIANT(id_isar4_el1) +FUNCTION_INVARIANT(id_isar5_el1) +FUNCTION_INVARIANT(clidr_el1) +FUNCTION_INVARIANT(aidr_el1) + +/* ->val is filled in by kvm_sys_reg_table_init() */ +static struct sys_reg_desc invariant_sys_regs[] = { + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0000), Op2(0b000), + NULL, get_midr_el1 }, + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0000), Op2(0b110), + NULL, get_revidr_el1 }, + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b000), + NULL, get_id_pfr0_el1 }, + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b001), + NULL, get_id_pfr1_el1 }, + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b010), + NULL, get_id_dfr0_el1 }, + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b011), + NULL, get_id_afr0_el1 }, + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b100), + NULL, get_id_mmfr0_el1 }, + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b101), + NULL, get_id_mmfr1_el1 }, + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b110), + NULL, get_id_mmfr2_el1 }, + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0001), Op2(0b111), + NULL, get_id_mmfr3_el1 }, + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b000), + NULL, get_id_isar0_el1 }, + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b001), + NULL, get_id_isar1_el1 }, + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b010), + NULL, get_id_isar2_el1 }, + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b011), + NULL, get_id_isar3_el1 }, + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b100), + NULL, get_id_isar4_el1 }, + { Op0(0b11), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b101), + NULL, get_id_isar5_el1 }, + { Op0(0b11), Op1(0b001), CRn(0b0000), CRm(0b0000), Op2(0b001), + NULL, get_clidr_el1 }, + { Op0(0b11), Op1(0b001), CRn(0b0000), CRm(0b0000), Op2(0b111), + NULL, get_aidr_el1 }, + { Op0(0b11), Op1(0b011), CRn(0b0000), CRm(0b0000), Op2(0b001), + NULL, get_ctr_el0 }, +}; + +static int reg_from_user(void *val, const void __user *uaddr, u64 id) +{ + /* This Just Works because we are little endian. */ + if (copy_from_user(val, uaddr, KVM_REG_SIZE(id)) != 0) + return -EFAULT; + return 0; +} + +static int reg_to_user(void __user *uaddr, const void *val, u64 id) +{ + /* This Just Works because we are little endian. */ + if (copy_to_user(uaddr, val, KVM_REG_SIZE(id)) != 0) + return -EFAULT; + return 0; +} + +static int get_invariant_sys_reg(u64 id, void __user *uaddr) +{ + struct sys_reg_params params; + const struct sys_reg_desc *r; + + if (!index_to_params(id, ¶ms)) + return -ENOENT; + + r = find_reg(¶ms, invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs)); + if (!r) + return -ENOENT; + + return reg_to_user(uaddr, &r->val, id); +} + +static int set_invariant_sys_reg(u64 id, void __user *uaddr) +{ + struct sys_reg_params params; + const struct sys_reg_desc *r; + int err; + u64 val = 0; /* Make sure high bits are 0 for 32-bit regs */ + + if (!index_to_params(id, ¶ms)) + return -ENOENT; + r = find_reg(¶ms, invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs)); + if (!r) + return -ENOENT; + + err = reg_from_user(&val, uaddr, id); + if (err) + return err; + + /* This is what we mean by invariant: you can't change it. */ + if (r->val != val) + return -EINVAL; + + return 0; +} + +static bool is_valid_cache(u32 val) +{ + u32 level, ctype; + + if (val >= CSSELR_MAX) + return -ENOENT; + + /* Bottom bit is Instruction or Data bit. Next 3 bits are level. */ + level = (val >> 1); + ctype = (cache_levels >> (level * 3)) & 7; + + switch (ctype) { + case 0: /* No cache */ + return false; + case 1: /* Instruction cache only */ + return (val & 1); + case 2: /* Data cache only */ + case 4: /* Unified cache */ + return !(val & 1); + case 3: /* Separate instruction and data caches */ + return true; + default: /* Reserved: we can't know instruction or data. */ + return false; + } +} + +static int demux_c15_get(u64 id, void __user *uaddr) +{ + u32 val; + u32 __user *uval = uaddr; + + /* Fail if we have unknown bits set. */ + if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK + | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1))) + return -ENOENT; + + switch (id & KVM_REG_ARM_DEMUX_ID_MASK) { + case KVM_REG_ARM_DEMUX_ID_CCSIDR: + if (KVM_REG_SIZE(id) != 4) + return -ENOENT; + val = (id & KVM_REG_ARM_DEMUX_VAL_MASK) + >> KVM_REG_ARM_DEMUX_VAL_SHIFT; + if (!is_valid_cache(val)) + return -ENOENT; + + return put_user(get_ccsidr(val), uval); + default: + return -ENOENT; + } +} + +static int demux_c15_set(u64 id, void __user *uaddr) +{ + u32 val, newval; + u32 __user *uval = uaddr; + + /* Fail if we have unknown bits set. */ + if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK + | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1))) + return -ENOENT; + + switch (id & KVM_REG_ARM_DEMUX_ID_MASK) { + case KVM_REG_ARM_DEMUX_ID_CCSIDR: + if (KVM_REG_SIZE(id) != 4) + return -ENOENT; + val = (id & KVM_REG_ARM_DEMUX_VAL_MASK) + >> KVM_REG_ARM_DEMUX_VAL_SHIFT; + if (!is_valid_cache(val)) + return -ENOENT; + + if (get_user(newval, uval)) + return -EFAULT; + + /* This is also invariant: you can't change it. */ + if (newval != get_ccsidr(val)) + return -EINVAL; + return 0; + default: + return -ENOENT; + } +} + +int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) +{ + const struct sys_reg_desc *r; + void __user *uaddr = (void __user *)(unsigned long)reg->addr; + + if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX) + return demux_c15_get(reg->id, uaddr); + + if (KVM_REG_SIZE(reg->id) != sizeof(__u64)) + return -ENOENT; + + r = index_to_sys_reg_desc(vcpu, reg->id); + if (!r) + return get_invariant_sys_reg(reg->id, uaddr); + + return reg_to_user(uaddr, &vcpu_sys_reg(vcpu, r->reg), reg->id); +} + +int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) +{ + const struct sys_reg_desc *r; + void __user *uaddr = (void __user *)(unsigned long)reg->addr; + + if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX) + return demux_c15_set(reg->id, uaddr); + + if (KVM_REG_SIZE(reg->id) != sizeof(__u64)) + return -ENOENT; + + r = index_to_sys_reg_desc(vcpu, reg->id); + if (!r) + return set_invariant_sys_reg(reg->id, uaddr); + + return reg_from_user(&vcpu_sys_reg(vcpu, r->reg), uaddr, reg->id); +} + +static unsigned int num_demux_regs(void) +{ + unsigned int i, count = 0; + + for (i = 0; i < CSSELR_MAX; i++) + if (is_valid_cache(i)) + count++; + + return count; +} + +static int write_demux_regids(u64 __user *uindices) +{ + u64 val = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_DEMUX; + unsigned int i; + + val |= KVM_REG_ARM_DEMUX_ID_CCSIDR; + for (i = 0; i < CSSELR_MAX; i++) { + if (!is_valid_cache(i)) + continue; + if (put_user(val | i, uindices)) + return -EFAULT; + uindices++; + } + return 0; +} + +static u64 sys_reg_to_index(const struct sys_reg_desc *reg) +{ + return (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | + KVM_REG_ARM64_SYSREG | + (reg->Op0 << KVM_REG_ARM64_SYSREG_OP0_SHIFT) | + (reg->Op1 << KVM_REG_ARM64_SYSREG_OP1_SHIFT) | + (reg->CRn << KVM_REG_ARM64_SYSREG_CRN_SHIFT) | + (reg->CRm << KVM_REG_ARM64_SYSREG_CRM_SHIFT) | + (reg->Op2 << KVM_REG_ARM64_SYSREG_OP2_SHIFT)); +} + +static bool copy_reg_to_user(const struct sys_reg_desc *reg, u64 __user **uind) +{ + if (!*uind) + return true; + + if (put_user(sys_reg_to_index(reg), *uind)) + return false; + + (*uind)++; + return true; +} + +/* Assumed ordered tables, see kvm_sys_reg_table_init. */ +static int walk_sys_regs(struct kvm_vcpu *vcpu, u64 __user *uind) +{ + const struct sys_reg_desc *i1, *i2, *end1, *end2; + unsigned int total = 0; + size_t num; + + /* We check for duplicates here, to allow arch-specific overrides. */ + i1 = get_target_table(vcpu->arch.target, true, &num); + end1 = i1 + num; + i2 = sys_reg_descs; + end2 = sys_reg_descs + ARRAY_SIZE(sys_reg_descs); + + BUG_ON(i1 == end1 || i2 == end2); + + /* Walk carefully, as both tables may refer to the same register. */ + while (i1 || i2) { + int cmp = cmp_sys_reg(i1, i2); + /* target-specific overrides generic entry. */ + if (cmp <= 0) { + /* Ignore registers we trap but don't save. */ + if (i1->reg) { + if (!copy_reg_to_user(i1, &uind)) + return -EFAULT; + total++; + } + } else { + /* Ignore registers we trap but don't save. */ + if (i2->reg) { + if (!copy_reg_to_user(i2, &uind)) + return -EFAULT; + total++; + } + } + + if (cmp <= 0 && ++i1 == end1) + i1 = NULL; + if (cmp >= 0 && ++i2 == end2) + i2 = NULL; + } + return total; +} + +unsigned long kvm_arm_num_sys_reg_descs(struct kvm_vcpu *vcpu) +{ + return ARRAY_SIZE(invariant_sys_regs) + + num_demux_regs() + + walk_sys_regs(vcpu, (u64 __user *)NULL); +} + +int kvm_arm_copy_sys_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) +{ + unsigned int i; + int err; + + /* Then give them all the invariant registers' indices. */ + for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) { + if (put_user(sys_reg_to_index(&invariant_sys_regs[i]), uindices)) + return -EFAULT; + uindices++; + } + + err = walk_sys_regs(vcpu, uindices); + if (err < 0) + return err; + uindices += err; + + return write_demux_regids(uindices); +} + +void kvm_sys_reg_table_init(void) +{ + unsigned int i; + struct sys_reg_desc clidr; + + /* Make sure tables are unique and in order. */ + for (i = 1; i < ARRAY_SIZE(sys_reg_descs); i++) + BUG_ON(cmp_sys_reg(&sys_reg_descs[i-1], &sys_reg_descs[i]) >= 0); + + /* We abuse the reset function to overwrite the table itself. */ + for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) + invariant_sys_regs[i].reset(NULL, &invariant_sys_regs[i]); + + /* + * CLIDR format is awkward, so clean it up. See ARM B4.1.20: + * + * If software reads the Cache Type fields from Ctype1 + * upwards, once it has seen a value of 0b000, no caches + * exist at further-out levels of the hierarchy. So, for + * example, if Ctype3 is the first Cache Type field with a + * value of 0b000, the values of Ctype4 to Ctype7 must be + * ignored. + */ + get_clidr_el1(NULL, &clidr); /* Ugly... */ + cache_levels = clidr.val; + for (i = 0; i < 7; i++) + if (((cache_levels >> (i*3)) & 7) == 0) + break; + /* Clear all higher bits. */ + cache_levels &= (1 << (i*3))-1; +} + +/** + * kvm_reset_sys_regs - sets system registers to reset value + * @vcpu: The VCPU pointer + * + * This function finds the right table above and sets the registers on the + * virtual CPU struct to their architecturally defined reset values. + */ +void kvm_reset_sys_regs(struct kvm_vcpu *vcpu) +{ + size_t num; + const struct sys_reg_desc *table; + + /* Catch someone adding a register without putting in reset entry. */ + memset(&vcpu->arch.ctxt.sys_regs, 0x42, sizeof(vcpu->arch.ctxt.sys_regs)); + + /* Generic chip reset first (so target could override). */ + reset_sys_reg_descs(vcpu, sys_reg_descs, ARRAY_SIZE(sys_reg_descs)); + + table = get_target_table(vcpu->arch.target, true, &num); + reset_sys_reg_descs(vcpu, table, num); + + for (num = 1; num < NR_SYS_REGS; num++) + if (vcpu_sys_reg(vcpu, num) == 0x4242424242424242) + panic("Didn't reset vcpu_sys_reg(%zi)", num); +} diff --git a/arch/arm64/kvm/sys_regs.h b/arch/arm64/kvm/sys_regs.h new file mode 100644 index 000000000000..d50d3722998e --- /dev/null +++ b/arch/arm64/kvm/sys_regs.h @@ -0,0 +1,138 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * Derived from arch/arm/kvm/coproc.h + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Authors: Christoffer Dall <c.dall@virtualopensystems.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ARM64_KVM_SYS_REGS_LOCAL_H__ +#define __ARM64_KVM_SYS_REGS_LOCAL_H__ + +struct sys_reg_params { + u8 Op0; + u8 Op1; + u8 CRn; + u8 CRm; + u8 Op2; + u8 Rt; + bool is_write; +}; + +struct sys_reg_desc { + /* MRS/MSR instruction which accesses it. */ + u8 Op0; + u8 Op1; + u8 CRn; + u8 CRm; + u8 Op2; + + /* Trapped access from guest, if non-NULL. */ + bool (*access)(struct kvm_vcpu *, + const struct sys_reg_params *, + const struct sys_reg_desc *); + + /* Initialization for vcpu. */ + void (*reset)(struct kvm_vcpu *, const struct sys_reg_desc *); + + /* Index into sys_reg[], or 0 if we don't need to save it. */ + int reg; + + /* Value (usually reset value) */ + u64 val; +}; + +static inline void print_sys_reg_instr(const struct sys_reg_params *p) +{ + /* Look, we even formatted it for you to paste into the table! */ + kvm_pr_unimpl(" { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n", + p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read"); +} + +static inline bool ignore_write(struct kvm_vcpu *vcpu, + const struct sys_reg_params *p) +{ + return true; +} + +static inline bool read_zero(struct kvm_vcpu *vcpu, + const struct sys_reg_params *p) +{ + *vcpu_reg(vcpu, p->Rt) = 0; + return true; +} + +static inline bool write_to_read_only(struct kvm_vcpu *vcpu, + const struct sys_reg_params *params) +{ + kvm_debug("sys_reg write to read-only register at: %lx\n", + *vcpu_pc(vcpu)); + print_sys_reg_instr(params); + return false; +} + +static inline bool read_from_write_only(struct kvm_vcpu *vcpu, + const struct sys_reg_params *params) +{ + kvm_debug("sys_reg read to write-only register at: %lx\n", + *vcpu_pc(vcpu)); + print_sys_reg_instr(params); + return false; +} + +/* Reset functions */ +static inline void reset_unknown(struct kvm_vcpu *vcpu, + const struct sys_reg_desc *r) +{ + BUG_ON(!r->reg); + BUG_ON(r->reg >= NR_SYS_REGS); + vcpu_sys_reg(vcpu, r->reg) = 0x1de7ec7edbadc0deULL; +} + +static inline void reset_val(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) +{ + BUG_ON(!r->reg); + BUG_ON(r->reg >= NR_SYS_REGS); + vcpu_sys_reg(vcpu, r->reg) = r->val; +} + +static inline int cmp_sys_reg(const struct sys_reg_desc *i1, + const struct sys_reg_desc *i2) +{ + BUG_ON(i1 == i2); + if (!i1) + return 1; + else if (!i2) + return -1; + if (i1->Op0 != i2->Op0) + return i1->Op0 - i2->Op0; + if (i1->Op1 != i2->Op1) + return i1->Op1 - i2->Op1; + if (i1->CRn != i2->CRn) + return i1->CRn - i2->CRn; + if (i1->CRm != i2->CRm) + return i1->CRm - i2->CRm; + return i1->Op2 - i2->Op2; +} + + +#define Op0(_x) .Op0 = _x +#define Op1(_x) .Op1 = _x +#define CRn(_x) .CRn = _x +#define CRm(_x) .CRm = _x +#define Op2(_x) .Op2 = _x + +#endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */ diff --git a/arch/arm64/kvm/sys_regs_generic_v8.c b/arch/arm64/kvm/sys_regs_generic_v8.c new file mode 100644 index 000000000000..4268ab9356b1 --- /dev/null +++ b/arch/arm64/kvm/sys_regs_generic_v8.c @@ -0,0 +1,95 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + * + * Based on arch/arm/kvm/coproc_a15.c: + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Authors: Rusty Russell <rusty@rustcorp.au> + * Christoffer Dall <c.dall@virtualopensystems.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#include <linux/kvm_host.h> +#include <asm/cputype.h> +#include <asm/kvm_arm.h> +#include <asm/kvm_asm.h> +#include <asm/kvm_host.h> +#include <asm/kvm_emulate.h> +#include <asm/kvm_coproc.h> +#include <linux/init.h> + +#include "sys_regs.h" + +static bool access_actlr(struct kvm_vcpu *vcpu, + const struct sys_reg_params *p, + const struct sys_reg_desc *r) +{ + if (p->is_write) + return ignore_write(vcpu, p); + + *vcpu_reg(vcpu, p->Rt) = vcpu_sys_reg(vcpu, ACTLR_EL1); + return true; +} + +static void reset_actlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) +{ + u64 actlr; + + asm volatile("mrs %0, actlr_el1\n" : "=r" (actlr)); + vcpu_sys_reg(vcpu, ACTLR_EL1) = actlr; +} + +/* + * Implementation specific sys-reg registers. + * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2 + */ +static const struct sys_reg_desc genericv8_sys_regs[] = { + /* ACTLR_EL1 */ + { Op0(0b11), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b001), + access_actlr, reset_actlr, ACTLR_EL1 }, +}; + +static const struct sys_reg_desc genericv8_cp15_regs[] = { + /* ACTLR */ + { Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b001), + access_actlr }, +}; + +static struct kvm_sys_reg_target_table genericv8_target_table = { + .table64 = { + .table = genericv8_sys_regs, + .num = ARRAY_SIZE(genericv8_sys_regs), + }, + .table32 = { + .table = genericv8_cp15_regs, + .num = ARRAY_SIZE(genericv8_cp15_regs), + }, +}; + +static int __init sys_reg_genericv8_init(void) +{ + unsigned int i; + + for (i = 1; i < ARRAY_SIZE(genericv8_sys_regs); i++) + BUG_ON(cmp_sys_reg(&genericv8_sys_regs[i-1], + &genericv8_sys_regs[i]) >= 0); + + kvm_register_target_sys_reg_table(KVM_ARM_TARGET_AEM_V8, + &genericv8_target_table); + kvm_register_target_sys_reg_table(KVM_ARM_TARGET_FOUNDATION_V8, + &genericv8_target_table); + kvm_register_target_sys_reg_table(KVM_ARM_TARGET_CORTEX_A57, + &genericv8_target_table); + return 0; +} +late_initcall(sys_reg_genericv8_init); diff --git a/arch/arm64/mm/Makefile b/arch/arm64/mm/Makefile index 3140a2abcdc2..b51d36401d83 100644 --- a/arch/arm64/mm/Makefile +++ b/arch/arm64/mm/Makefile @@ -2,3 +2,4 @@ obj-y := dma-mapping.o extable.o fault.o init.o \ cache.o copypage.o flush.o \ ioremap.o mmap.o pgd.o mmu.o \ context.o tlb.o proc.o +obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 1426468b77f3..0ecac8980aae 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -365,17 +365,6 @@ static int __kprobes do_translation_fault(unsigned long addr, } /* - * Some section permission faults need to be handled gracefully. They can - * happen due to a __{get,put}_user during an oops. - */ -static int do_sect_fault(unsigned long addr, unsigned int esr, - struct pt_regs *regs) -{ - do_bad_area(addr, esr, regs); - return 0; -} - -/* * This abort handler always returns "fault". */ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs) @@ -398,12 +387,12 @@ static struct fault_info { { do_translation_fault, SIGSEGV, SEGV_MAPERR, "level 2 translation fault" }, { do_page_fault, SIGSEGV, SEGV_MAPERR, "level 3 translation fault" }, { do_bad, SIGBUS, 0, "reserved access flag fault" }, - { do_bad, SIGSEGV, SEGV_ACCERR, "level 1 access flag fault" }, - { do_bad, SIGSEGV, SEGV_ACCERR, "level 2 access flag fault" }, + { do_page_fault, SIGSEGV, SEGV_ACCERR, "level 1 access flag fault" }, + { do_page_fault, SIGSEGV, SEGV_ACCERR, "level 2 access flag fault" }, { do_page_fault, SIGSEGV, SEGV_ACCERR, "level 3 access flag fault" }, { do_bad, SIGBUS, 0, "reserved permission fault" }, - { do_bad, SIGSEGV, SEGV_ACCERR, "level 1 permission fault" }, - { do_sect_fault, SIGSEGV, SEGV_ACCERR, "level 2 permission fault" }, + { do_page_fault, SIGSEGV, SEGV_ACCERR, "level 1 permission fault" }, + { do_page_fault, SIGSEGV, SEGV_ACCERR, "level 2 permission fault" }, { do_page_fault, SIGSEGV, SEGV_ACCERR, "level 3 permission fault" }, { do_bad, SIGBUS, 0, "synchronous external abort" }, { do_bad, SIGBUS, 0, "asynchronous external abort" }, diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c index 88611c3a421a..e4193e3adc7f 100644 --- a/arch/arm64/mm/flush.c +++ b/arch/arm64/mm/flush.c @@ -70,23 +70,16 @@ void copy_to_user_page(struct vm_area_struct *vma, struct page *page, #endif } -void __flush_dcache_page(struct page *page) -{ - __flush_dcache_area(page_address(page), PAGE_SIZE); -} - void __sync_icache_dcache(pte_t pte, unsigned long addr) { - unsigned long pfn; - struct page *page; + struct page *page = pte_page(pte); - pfn = pte_pfn(pte); - if (!pfn_valid(pfn)) + /* no flushing needed for anonymous pages */ + if (!page_mapping(page)) return; - page = pfn_to_page(pfn); if (!test_and_set_bit(PG_dcache_clean, &page->flags)) { - __flush_dcache_page(page); + __flush_dcache_area(page_address(page), PAGE_SIZE); __flush_icache_all(); } else if (icache_is_aivivt()) { __flush_icache_all(); @@ -94,28 +87,14 @@ void __sync_icache_dcache(pte_t pte, unsigned long addr) } /* - * Ensure cache coherency between kernel mapping and userspace mapping of this - * page. + * This function is called when a page has been modified by the kernel. Mark + * it as dirty for later flushing when mapped in user space (if executable, + * see __sync_icache_dcache). */ void flush_dcache_page(struct page *page) { - struct address_space *mapping; - - /* - * The zero page is never written to, so never has any dirty cache - * lines, and therefore never needs to be flushed. - */ - if (page == ZERO_PAGE(0)) - return; - - mapping = page_mapping(page); - if (mapping && mapping_mapped(mapping)) { - __flush_dcache_page(page); - __flush_icache_all(); - set_bit(PG_dcache_clean, &page->flags); - } else { + if (test_bit(PG_dcache_clean, &page->flags)) clear_bit(PG_dcache_clean, &page->flags); - } } EXPORT_SYMBOL(flush_dcache_page); diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c new file mode 100644 index 000000000000..2fc8258bab2d --- /dev/null +++ b/arch/arm64/mm/hugetlbpage.c @@ -0,0 +1,70 @@ +/* + * arch/arm64/mm/hugetlbpage.c + * + * Copyright (C) 2013 Linaro Ltd. + * + * Based on arch/x86/mm/hugetlbpage.c. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/init.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/hugetlb.h> +#include <linux/pagemap.h> +#include <linux/err.h> +#include <linux/sysctl.h> +#include <asm/mman.h> +#include <asm/tlb.h> +#include <asm/tlbflush.h> +#include <asm/pgalloc.h> + +#ifndef CONFIG_ARCH_WANT_HUGE_PMD_SHARE +int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) +{ + return 0; +} +#endif + +struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, + int write) +{ + return ERR_PTR(-EINVAL); +} + +int pmd_huge(pmd_t pmd) +{ + return !(pmd_val(pmd) & PMD_TABLE_BIT); +} + +int pud_huge(pud_t pud) +{ + return !(pud_val(pud) & PUD_TABLE_BIT); +} + +static __init int setup_hugepagesz(char *opt) +{ + unsigned long ps = memparse(opt, &opt); + if (ps == PMD_SIZE) { + hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); + } else if (ps == PUD_SIZE) { + hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); + } else { + pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20); + return 0; + } + return 1; +} +__setup("hugepagesz=", setup_hugepagesz); diff --git a/arch/arm64/mm/mm.h b/arch/arm64/mm/mm.h index 916701e6d040..d519f4f50c8c 100644 --- a/arch/arm64/mm/mm.h +++ b/arch/arm64/mm/mm.h @@ -1,3 +1,2 @@ -extern void __flush_dcache_page(struct page *page); extern void __init bootmem_init(void); extern void __init arm64_swiotlb_init(void); diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index eeecc9c8ed68..a8d1059b91b2 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -297,6 +297,16 @@ static void __init map_mem(void) { struct memblock_region *reg; + /* + * Temporarily limit the memblock range. We need to do this as + * create_mapping requires puds, pmds and ptes to be allocated from + * memory addressable from the initial direct kernel mapping. + * + * The initial direct kernel mapping, located at swapper_pg_dir, + * gives us PGDIR_SIZE memory starting from PHYS_OFFSET (aligned). + */ + memblock_set_current_limit((PHYS_OFFSET & PGDIR_MASK) + PGDIR_SIZE); + /* map all the memory banks */ for_each_memblock(memory, reg) { phys_addr_t start = reg->base; @@ -307,6 +317,9 @@ static void __init map_mem(void) create_mapping(start, __phys_to_virt(start), end - start); } + + /* Limit no longer required. */ + memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE); } /* @@ -317,12 +330,6 @@ void __init paging_init(void) { void *zero_page; - /* - * Maximum PGDIR_SIZE addressable via the initial direct kernel - * mapping in swapper_pg_dir. - */ - memblock_set_current_limit((PHYS_OFFSET & PGDIR_MASK) + PGDIR_SIZE); - init_mem_pgprot(); map_mem(); @@ -339,7 +346,6 @@ void __init paging_init(void) bootmem_init(); empty_zero_page = virt_to_page(zero_page); - __flush_dcache_page(empty_zero_page); /* * TTBR0 is only used for the identity mapping at this stage. Make it diff --git a/arch/arm64/xen/Makefile b/arch/arm64/xen/Makefile new file mode 100644 index 000000000000..be240404ba96 --- /dev/null +++ b/arch/arm64/xen/Makefile @@ -0,0 +1,2 @@ +xen-arm-y += $(addprefix ../../arm/xen/, enlighten.o grant-table.o) +obj-y := xen-arm.o hypercall.o diff --git a/arch/arm64/xen/hypercall.S b/arch/arm64/xen/hypercall.S new file mode 100644 index 000000000000..2816c479cd49 --- /dev/null +++ b/arch/arm64/xen/hypercall.S @@ -0,0 +1,92 @@ +/****************************************************************************** + * hypercall.S + * + * Xen hypercall wrappers + * + * Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012 + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation; or, when distributed + * separately from the Linux kernel or incorporated into other + * software packages, subject to the following license: + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this source file (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, copy, modify, + * merge, publish, distribute, sublicense, and/or sell copies of the Software, + * and to permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +/* + * The Xen hypercall calling convention is very similar to the procedure + * call standard for the ARM 64-bit architecture: the first parameter is + * passed in x0, the second in x1, the third in x2, the fourth in x3 and + * the fifth in x4. + * + * The hypercall number is passed in x16. + * + * The return value is in x0. + * + * The hvc ISS is required to be 0xEA1, that is the Xen specific ARM + * hypercall tag. + * + * Parameter structs passed to hypercalls are laid out according to + * the ARM 64-bit EABI standard. + */ + +#include <linux/linkage.h> +#include <asm/assembler.h> +#include <xen/interface/xen.h> + + +#define XEN_IMM 0xEA1 + +#define HYPERCALL_SIMPLE(hypercall) \ +ENTRY(HYPERVISOR_##hypercall) \ + mov x16, #__HYPERVISOR_##hypercall; \ + hvc XEN_IMM; \ + ret; \ +ENDPROC(HYPERVISOR_##hypercall) + +#define HYPERCALL0 HYPERCALL_SIMPLE +#define HYPERCALL1 HYPERCALL_SIMPLE +#define HYPERCALL2 HYPERCALL_SIMPLE +#define HYPERCALL3 HYPERCALL_SIMPLE +#define HYPERCALL4 HYPERCALL_SIMPLE +#define HYPERCALL5 HYPERCALL_SIMPLE + + .text + +HYPERCALL2(xen_version); +HYPERCALL3(console_io); +HYPERCALL3(grant_table_op); +HYPERCALL2(sched_op); +HYPERCALL2(event_channel_op); +HYPERCALL2(hvm_op); +HYPERCALL2(memory_op); +HYPERCALL2(physdev_op); +HYPERCALL3(vcpu_op); + +ENTRY(privcmd_call) + mov x16, x0 + mov x0, x1 + mov x1, x2 + mov x2, x3 + mov x3, x4 + mov x4, x5 + hvc XEN_IMM + ret +ENDPROC(privcmd_call); diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index d98b665e6536..b094816a7e0f 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -207,6 +207,12 @@ config ARCH_HIBERNATION_POSSIBLE config ARCH_SUSPEND_POSSIBLE def_bool y +config ARCH_WANT_HUGE_PMD_SHARE + def_bool y + +config ARCH_WANT_GENERAL_HUGETLB + def_bool y + config ZONE_DMA32 bool default X86_64 diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c index ae1aa71d0115..7e73e8c69096 100644 --- a/arch/x86/mm/hugetlbpage.c +++ b/arch/x86/mm/hugetlbpage.c @@ -16,169 +16,6 @@ #include <asm/tlbflush.h> #include <asm/pgalloc.h> -static unsigned long page_table_shareable(struct vm_area_struct *svma, - struct vm_area_struct *vma, - unsigned long addr, pgoff_t idx) -{ - unsigned long saddr = ((idx - svma->vm_pgoff) << PAGE_SHIFT) + - svma->vm_start; - unsigned long sbase = saddr & PUD_MASK; - unsigned long s_end = sbase + PUD_SIZE; - - /* Allow segments to share if only one is marked locked */ - unsigned long vm_flags = vma->vm_flags & ~VM_LOCKED; - unsigned long svm_flags = svma->vm_flags & ~VM_LOCKED; - - /* - * match the virtual addresses, permission and the alignment of the - * page table page. - */ - if (pmd_index(addr) != pmd_index(saddr) || - vm_flags != svm_flags || - sbase < svma->vm_start || svma->vm_end < s_end) - return 0; - - return saddr; -} - -static int vma_shareable(struct vm_area_struct *vma, unsigned long addr) -{ - unsigned long base = addr & PUD_MASK; - unsigned long end = base + PUD_SIZE; - - /* - * check on proper vm_flags and page table alignment - */ - if (vma->vm_flags & VM_MAYSHARE && - vma->vm_start <= base && end <= vma->vm_end) - return 1; - return 0; -} - -/* - * Search for a shareable pmd page for hugetlb. In any case calls pmd_alloc() - * and returns the corresponding pte. While this is not necessary for the - * !shared pmd case because we can allocate the pmd later as well, it makes the - * code much cleaner. pmd allocation is essential for the shared case because - * pud has to be populated inside the same i_mmap_mutex section - otherwise - * racing tasks could either miss the sharing (see huge_pte_offset) or select a - * bad pmd for sharing. - */ -static pte_t * -huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud) -{ - struct vm_area_struct *vma = find_vma(mm, addr); - struct address_space *mapping = vma->vm_file->f_mapping; - pgoff_t idx = ((addr - vma->vm_start) >> PAGE_SHIFT) + - vma->vm_pgoff; - struct vm_area_struct *svma; - unsigned long saddr; - pte_t *spte = NULL; - pte_t *pte; - - if (!vma_shareable(vma, addr)) - return (pte_t *)pmd_alloc(mm, pud, addr); - - mutex_lock(&mapping->i_mmap_mutex); - vma_interval_tree_foreach(svma, &mapping->i_mmap, idx, idx) { - if (svma == vma) - continue; - - saddr = page_table_shareable(svma, vma, addr, idx); - if (saddr) { - spte = huge_pte_offset(svma->vm_mm, saddr); - if (spte) { - get_page(virt_to_page(spte)); - break; - } - } - } - - if (!spte) - goto out; - - spin_lock(&mm->page_table_lock); - if (pud_none(*pud)) - pud_populate(mm, pud, (pmd_t *)((unsigned long)spte & PAGE_MASK)); - else - put_page(virt_to_page(spte)); - spin_unlock(&mm->page_table_lock); -out: - pte = (pte_t *)pmd_alloc(mm, pud, addr); - mutex_unlock(&mapping->i_mmap_mutex); - return pte; -} - -/* - * unmap huge page backed by shared pte. - * - * Hugetlb pte page is ref counted at the time of mapping. If pte is shared - * indicated by page_count > 1, unmap is achieved by clearing pud and - * decrementing the ref count. If count == 1, the pte page is not shared. - * - * called with vma->vm_mm->page_table_lock held. - * - * returns: 1 successfully unmapped a shared pte page - * 0 the underlying pte page is not shared, or it is the last user - */ -int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) -{ - pgd_t *pgd = pgd_offset(mm, *addr); - pud_t *pud = pud_offset(pgd, *addr); - - BUG_ON(page_count(virt_to_page(ptep)) == 0); - if (page_count(virt_to_page(ptep)) == 1) - return 0; - - pud_clear(pud); - put_page(virt_to_page(ptep)); - *addr = ALIGN(*addr, HPAGE_SIZE * PTRS_PER_PTE) - HPAGE_SIZE; - return 1; -} - -pte_t *huge_pte_alloc(struct mm_struct *mm, - unsigned long addr, unsigned long sz) -{ - pgd_t *pgd; - pud_t *pud; - pte_t *pte = NULL; - - pgd = pgd_offset(mm, addr); - pud = pud_alloc(mm, pgd, addr); - if (pud) { - if (sz == PUD_SIZE) { - pte = (pte_t *)pud; - } else { - BUG_ON(sz != PMD_SIZE); - if (pud_none(*pud)) - pte = huge_pmd_share(mm, addr, pud); - else - pte = (pte_t *)pmd_alloc(mm, pud, addr); - } - } - BUG_ON(pte && !pte_none(*pte) && !pte_huge(*pte)); - - return pte; -} - -pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) -{ - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd = NULL; - - pgd = pgd_offset(mm, addr); - if (pgd_present(*pgd)) { - pud = pud_offset(pgd, addr); - if (pud_present(*pud)) { - if (pud_large(*pud)) - return (pte_t *)pud; - pmd = pmd_offset(pud, addr); - } - } - return (pte_t *) pmd; -} - #if 0 /* This is just for testing */ struct page * follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) @@ -240,30 +77,6 @@ int pud_huge(pud_t pud) return !!(pud_val(pud) & _PAGE_PSE); } -struct page * -follow_huge_pmd(struct mm_struct *mm, unsigned long address, - pmd_t *pmd, int write) -{ - struct page *page; - - page = pte_page(*(pte_t *)pmd); - if (page) - page += ((address & ~PMD_MASK) >> PAGE_SHIFT); - return page; -} - -struct page * -follow_huge_pud(struct mm_struct *mm, unsigned long address, - pud_t *pud, int write) -{ - struct page *page; - - page = pte_page(*(pte_t *)pud); - if (page) - page += ((address & ~PUD_MASK) >> PAGE_SHIFT); - return page; -} - #endif /* x86_64 also uses this file */ |