diff options
author | Vladimir Murzin <vladimir.murzin@arm.com> | 2016-09-12 15:49:24 +0100 |
---|---|---|
committer | Christoffer Dall <christoffer.dall@linaro.org> | 2016-09-22 13:22:21 +0200 |
commit | acda5430bee4621f218391d0bcfbe4412adb3554 (patch) | |
tree | d279ce897d2666ca9481963dca9fc9aede6e85dd /arch | |
parent | a078bedf17c2e43819fea54bdfd5793845142e3a (diff) | |
download | linux-acda5430bee4621f218391d0bcfbe4412adb3554.tar.bz2 |
ARM: KVM: Support vgic-v3
This patch allows to build and use vgic-v3 in 32-bit mode.
Unfortunately, it can not be split in several steps without extra
stubs to keep patches independent and bisectable. For instance,
virt/kvm/arm/vgic/vgic-v3.c uses function from vgic-v3-sr.c, handling
access to GICv3 cpu interface from the guest requires vgic_v3.vgic_sre
to be already defined.
It is how support has been done:
* handle SGI requests from the guest
* report configured SRE on access to GICv3 cpu interface from the guest
* required vgic-v3 macros are provided via uapi.h
* static keys are used to select GIC backend
* to make vgic-v3 build KVM_ARM_VGIC_V3 guard is removed along with
the static inlines
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/arm/include/asm/kvm_asm.h | 3 | ||||
-rw-r--r-- | arch/arm/include/asm/kvm_host.h | 5 | ||||
-rw-r--r-- | arch/arm/include/asm/kvm_hyp.h | 3 | ||||
-rw-r--r-- | arch/arm/include/uapi/asm/kvm.h | 7 | ||||
-rw-r--r-- | arch/arm/kvm/Makefile | 2 | ||||
-rw-r--r-- | arch/arm/kvm/coproc.c | 35 | ||||
-rw-r--r-- | arch/arm/kvm/hyp/Makefile | 1 | ||||
-rw-r--r-- | arch/arm/kvm/hyp/switch.c | 12 | ||||
-rw-r--r-- | arch/arm64/kvm/Kconfig | 4 |
9 files changed, 66 insertions, 6 deletions
diff --git a/arch/arm/include/asm/kvm_asm.h b/arch/arm/include/asm/kvm_asm.h index 05e47faf96a1..d7ea6bcb29bf 100644 --- a/arch/arm/include/asm/kvm_asm.h +++ b/arch/arm/include/asm/kvm_asm.h @@ -72,6 +72,9 @@ extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu); extern void __init_stage2_translation(void); extern void __kvm_hyp_reset(unsigned long); + +extern u64 __vgic_v3_get_ich_vtr_el2(void); +extern void __vgic_v3_init_lrs(void); #endif #endif /* __ARM_KVM_ASM_H__ */ diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index de338d93d11b..c2c40a7ee738 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -39,7 +39,12 @@ #include <kvm/arm_vgic.h> + +#ifdef CONFIG_ARM_GIC_V3 +#define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS +#else #define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS +#endif #define KVM_REQ_VCPU_EXIT 8 diff --git a/arch/arm/include/asm/kvm_hyp.h b/arch/arm/include/asm/kvm_hyp.h index e604ad68a06b..343135ede5fa 100644 --- a/arch/arm/include/asm/kvm_hyp.h +++ b/arch/arm/include/asm/kvm_hyp.h @@ -106,6 +106,9 @@ void __vgic_v2_restore_state(struct kvm_vcpu *vcpu); void __sysreg_save_state(struct kvm_cpu_context *ctxt); void __sysreg_restore_state(struct kvm_cpu_context *ctxt); +void __vgic_v3_save_state(struct kvm_vcpu *vcpu); +void __vgic_v3_restore_state(struct kvm_vcpu *vcpu); + void asmlinkage __vfp_save_state(struct vfp_hard_struct *vfp); void asmlinkage __vfp_restore_state(struct vfp_hard_struct *vfp); static inline bool __vfp_enabled(void) diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h index a2b3eb313a25..b38c10c73579 100644 --- a/arch/arm/include/uapi/asm/kvm.h +++ b/arch/arm/include/uapi/asm/kvm.h @@ -84,6 +84,13 @@ struct kvm_regs { #define KVM_VGIC_V2_DIST_SIZE 0x1000 #define KVM_VGIC_V2_CPU_SIZE 0x2000 +/* Supported VGICv3 address types */ +#define KVM_VGIC_V3_ADDR_TYPE_DIST 2 +#define KVM_VGIC_V3_ADDR_TYPE_REDIST 3 + +#define KVM_VGIC_V3_DIST_SIZE SZ_64K +#define KVM_VGIC_V3_REDIST_SIZE (2 * SZ_64K) + #define KVM_ARM_VCPU_POWER_OFF 0 /* CPU is started in OFF state */ #define KVM_ARM_VCPU_PSCI_0_2 1 /* CPU uses PSCI v0.2 */ diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile index 339ec88a15a6..f19842ea5418 100644 --- a/arch/arm/kvm/Makefile +++ b/arch/arm/kvm/Makefile @@ -27,8 +27,10 @@ obj-y += $(KVM)/arm/vgic/vgic.o obj-y += $(KVM)/arm/vgic/vgic-init.o obj-y += $(KVM)/arm/vgic/vgic-irqfd.o obj-y += $(KVM)/arm/vgic/vgic-v2.o +obj-y += $(KVM)/arm/vgic/vgic-v3.o obj-y += $(KVM)/arm/vgic/vgic-mmio.o obj-y += $(KVM)/arm/vgic/vgic-mmio-v2.o +obj-y += $(KVM)/arm/vgic/vgic-mmio-v3.o obj-y += $(KVM)/arm/vgic/vgic-kvm-device.o obj-y += $(KVM)/irqchip.o obj-y += $(KVM)/arm/arch_timer.o diff --git a/arch/arm/kvm/coproc.c b/arch/arm/kvm/coproc.c index 1bb2b79c01ff..3e5e4194ef86 100644 --- a/arch/arm/kvm/coproc.c +++ b/arch/arm/kvm/coproc.c @@ -228,6 +228,35 @@ bool access_vm_reg(struct kvm_vcpu *vcpu, return true; } +static bool access_gic_sgi(struct kvm_vcpu *vcpu, + const struct coproc_params *p, + const struct coproc_reg *r) +{ + u64 reg; + + if (!p->is_write) + return read_from_write_only(vcpu, p); + + reg = (u64)*vcpu_reg(vcpu, p->Rt2) << 32; + reg |= *vcpu_reg(vcpu, p->Rt1) ; + + vgic_v3_dispatch_sgi(vcpu, reg); + + return true; +} + +static bool access_gic_sre(struct kvm_vcpu *vcpu, + const struct coproc_params *p, + const struct coproc_reg *r) +{ + if (p->is_write) + return ignore_write(vcpu, p); + + *vcpu_reg(vcpu, p->Rt1) = vcpu->arch.vgic_cpu.vgic_v3.vgic_sre; + + return true; +} + /* * We could trap ID_DFR0 and tell the guest we don't support performance * monitoring. Unfortunately the patch to make the kernel check ID_DFR0 was @@ -361,10 +390,16 @@ static const struct coproc_reg cp15_regs[] = { { CRn(10), CRm( 3), Op1( 0), Op2( 1), is32, access_vm_reg, reset_unknown, c10_AMAIR1}, + /* ICC_SGI1R */ + { CRm64(12), Op1( 0), is64, access_gic_sgi}, + /* VBAR: swapped by interrupt.S. */ { CRn(12), CRm( 0), Op1( 0), Op2( 0), is32, NULL, reset_val, c12_VBAR, 0x00000000 }, + /* ICC_SRE */ + { CRn(12), CRm(12), Op1( 0), Op2(5), is32, access_gic_sre }, + /* CONTEXTIDR/TPIDRURW/TPIDRURO/TPIDRPRW: swapped by interrupt.S. */ { CRn(13), CRm( 0), Op1( 0), Op2( 1), is32, access_vm_reg, reset_val, c13_CID, 0x00000000 }, diff --git a/arch/arm/kvm/hyp/Makefile b/arch/arm/kvm/hyp/Makefile index 8dfa5f7f9290..3023bb530edf 100644 --- a/arch/arm/kvm/hyp/Makefile +++ b/arch/arm/kvm/hyp/Makefile @@ -5,6 +5,7 @@ KVM=../../../../virt/kvm obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/vgic-v2-sr.o +obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/vgic-v3-sr.o obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/timer-sr.o obj-$(CONFIG_KVM_ARM_HOST) += tlb.o diff --git a/arch/arm/kvm/hyp/switch.c b/arch/arm/kvm/hyp/switch.c index 9da16fd1005f..92678b7bd046 100644 --- a/arch/arm/kvm/hyp/switch.c +++ b/arch/arm/kvm/hyp/switch.c @@ -14,6 +14,7 @@ * 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/jump_label.h> #include <asm/kvm_asm.h> #include <asm/kvm_hyp.h> @@ -83,14 +84,21 @@ static void __hyp_text __deactivate_vm(struct kvm_vcpu *vcpu) write_sysreg(read_sysreg(MIDR), VPIDR); } + static void __hyp_text __vgic_save_state(struct kvm_vcpu *vcpu) { - __vgic_v2_save_state(vcpu); + if (static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) + __vgic_v3_save_state(vcpu); + else + __vgic_v2_save_state(vcpu); } static void __hyp_text __vgic_restore_state(struct kvm_vcpu *vcpu) { - __vgic_v2_restore_state(vcpu); + if (static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) + __vgic_v3_restore_state(vcpu); + else + __vgic_v2_restore_state(vcpu); } static bool __hyp_text __populate_fault_info(struct kvm_vcpu *vcpu) diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index 7ba91647d1c5..6eaf12c1d627 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -19,9 +19,6 @@ if VIRTUALIZATION config KVM_ARM_VGIC_V3_ITS bool -config KVM_ARM_VGIC_V3 - bool - config KVM bool "Kernel-based Virtual Machine (KVM) support" depends on OF @@ -37,7 +34,6 @@ config KVM select KVM_VFIO select HAVE_KVM_EVENTFD select HAVE_KVM_IRQFD - select KVM_ARM_VGIC_V3 select KVM_ARM_VGIC_V3_ITS select KVM_ARM_PMU if HW_PERF_EVENTS select HAVE_KVM_MSI |