summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorPaolo Bonzini <pbonzini@redhat.com>2020-01-30 18:13:14 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2020-01-30 18:13:14 +0100
commit621ab20c06e0c0b45eb2382c048a0426bbff9b0e (patch)
tree063fe0957312e78dffed221663bc0251b7106e8b
parent3009afc6e39e78708d8fb444ae50544b3bcd3a3f (diff)
parent4a267aa707953a9a73d1f5dc7f894dd9024a92be (diff)
downloadlinux-621ab20c06e0c0b45eb2382c048a0426bbff9b0e.tar.bz2
Merge tag 'kvmarm-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD
KVM/arm updates for Linux 5.6 - Fix MMIO sign extension - Fix HYP VA tagging on tag space exhaustion - Fix PSTATE/CPSR handling when generating exception - Fix MMU notifier's advertizing of young pages - Fix poisoned page handling - Fix PMU SW event handling - Fix TVAL register access - Fix AArch32 external abort injection - Fix ITS unmapped collection handling - Various cleanups
-rw-r--r--Documentation/virt/kvm/api.txt9
-rw-r--r--arch/arm/include/asm/kvm_emulate.h27
-rw-r--r--arch/arm/include/asm/kvm_host.h12
-rw-r--r--arch/arm/include/asm/kvm_hyp.h1
-rw-r--r--arch/arm/include/asm/kvm_mmio.h26
-rw-r--r--arch/arm64/include/asm/kvm_emulate.h40
-rw-r--r--arch/arm64/include/asm/kvm_host.h12
-rw-r--r--arch/arm64/include/asm/kvm_mmio.h29
-rw-r--r--arch/arm64/include/asm/ptrace.h1
-rw-r--r--arch/arm64/include/uapi/asm/kvm.h12
-rw-r--r--arch/arm64/include/uapi/asm/ptrace.h1
-rw-r--r--arch/arm64/kvm/hyp/entry.S7
-rw-r--r--arch/arm64/kvm/inject_fault.c70
-rw-r--r--arch/arm64/kvm/va_layout.c56
-rw-r--r--virt/kvm/arm/aarch32.c131
-rw-r--r--virt/kvm/arm/arch_timer.c3
-rw-r--r--virt/kvm/arm/arm.c4
-rw-r--r--virt/kvm/arm/mmio.c68
-rw-r--r--virt/kvm/arm/mmu.c24
-rw-r--r--virt/kvm/arm/pmu.c114
-rw-r--r--virt/kvm/arm/vgic/vgic-its.c6
-rw-r--r--virt/kvm/arm/vgic/vgic-mmio-v3.c5
-rw-r--r--virt/kvm/arm/vgic/vgic-mmio.h5
23 files changed, 421 insertions, 242 deletions
diff --git a/Documentation/virt/kvm/api.txt b/Documentation/virt/kvm/api.txt
index ebb37b34dcfc..3a0c819c3573 100644
--- a/Documentation/virt/kvm/api.txt
+++ b/Documentation/virt/kvm/api.txt
@@ -2196,6 +2196,15 @@ arm64 CCSIDR registers are demultiplexed by CSSELR value:
arm64 system registers have the following id bit patterns:
0x6030 0000 0013 <op0:2> <op1:3> <crn:4> <crm:4> <op2:3>
+WARNING:
+ Two system register IDs do not follow the specified pattern. These
+ are KVM_REG_ARM_TIMER_CVAL and KVM_REG_ARM_TIMER_CNT, which map to
+ system registers CNTV_CVAL_EL0 and CNTVCT_EL0 respectively. These
+ two had their values accidentally swapped, which means TIMER_CVAL is
+ derived from the register encoding for CNTVCT_EL0 and TIMER_CNT is
+ derived from the register encoding for CNTV_CVAL_EL0. As this is
+ API, it must remain this way.
+
arm64 firmware pseudo-registers have the following bit pattern:
0x6030 0000 0014 <regno:16>
diff --git a/arch/arm/include/asm/kvm_emulate.h b/arch/arm/include/asm/kvm_emulate.h
index 9b118516d2db..3944305e81df 100644
--- a/arch/arm/include/asm/kvm_emulate.h
+++ b/arch/arm/include/asm/kvm_emulate.h
@@ -9,18 +9,29 @@
#include <linux/kvm_host.h>
#include <asm/kvm_asm.h>
-#include <asm/kvm_mmio.h>
#include <asm/kvm_arm.h>
#include <asm/cputype.h>
/* arm64 compatibility macros */
+#define PSR_AA32_MODE_FIQ FIQ_MODE
+#define PSR_AA32_MODE_SVC SVC_MODE
#define PSR_AA32_MODE_ABT ABT_MODE
#define PSR_AA32_MODE_UND UND_MODE
#define PSR_AA32_T_BIT PSR_T_BIT
+#define PSR_AA32_F_BIT PSR_F_BIT
#define PSR_AA32_I_BIT PSR_I_BIT
#define PSR_AA32_A_BIT PSR_A_BIT
#define PSR_AA32_E_BIT PSR_E_BIT
#define PSR_AA32_IT_MASK PSR_IT_MASK
+#define PSR_AA32_GE_MASK 0x000f0000
+#define PSR_AA32_DIT_BIT 0x00200000
+#define PSR_AA32_PAN_BIT 0x00400000
+#define PSR_AA32_SSBS_BIT 0x00800000
+#define PSR_AA32_Q_BIT PSR_Q_BIT
+#define PSR_AA32_V_BIT PSR_V_BIT
+#define PSR_AA32_C_BIT PSR_C_BIT
+#define PSR_AA32_Z_BIT PSR_Z_BIT
+#define PSR_AA32_N_BIT PSR_N_BIT
unsigned long *vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num);
@@ -41,6 +52,11 @@ static inline void vcpu_write_spsr(struct kvm_vcpu *vcpu, unsigned long v)
*__vcpu_spsr(vcpu) = v;
}
+static inline unsigned long host_spsr_to_spsr32(unsigned long spsr)
+{
+ return spsr;
+}
+
static inline unsigned long vcpu_get_reg(struct kvm_vcpu *vcpu,
u8 reg_num)
{
@@ -182,6 +198,11 @@ static inline bool kvm_vcpu_dabt_issext(struct kvm_vcpu *vcpu)
return kvm_vcpu_get_hsr(vcpu) & HSR_SSE;
}
+static inline bool kvm_vcpu_dabt_issf(const struct kvm_vcpu *vcpu)
+{
+ return false;
+}
+
static inline int kvm_vcpu_dabt_get_rd(struct kvm_vcpu *vcpu)
{
return (kvm_vcpu_get_hsr(vcpu) & HSR_SRT_MASK) >> HSR_SRT_SHIFT;
@@ -198,7 +219,7 @@ static inline bool kvm_vcpu_dabt_is_cm(struct kvm_vcpu *vcpu)
}
/* Get Access Size from a data abort */
-static inline int kvm_vcpu_dabt_get_as(struct kvm_vcpu *vcpu)
+static inline unsigned int kvm_vcpu_dabt_get_as(struct kvm_vcpu *vcpu)
{
switch ((kvm_vcpu_get_hsr(vcpu) >> 22) & 0x3) {
case 0:
@@ -209,7 +230,7 @@ static inline int kvm_vcpu_dabt_get_as(struct kvm_vcpu *vcpu)
return 4;
default:
kvm_err("Hardware is weird: SAS 0b11 is reserved\n");
- return -EFAULT;
+ return 4;
}
}
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 421594892304..c3314b286a61 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -14,7 +14,6 @@
#include <asm/cputype.h>
#include <asm/kvm.h>
#include <asm/kvm_asm.h>
-#include <asm/kvm_mmio.h>
#include <asm/fpstate.h>
#include <kvm/arm_arch_timer.h>
@@ -202,9 +201,6 @@ struct kvm_vcpu_arch {
/* Don't run the guest (internal implementation need) */
bool pause;
- /* IO related fields */
- struct kvm_decode mmio_decode;
-
/* Cache some mmu pages needed inside spinlock regions */
struct kvm_mmu_memory_cache mmu_page_cache;
@@ -298,6 +294,14 @@ int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
static inline void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run,
int exception_index) {}
+/* MMIO helpers */
+void kvm_mmio_write_buf(void *buf, unsigned int len, unsigned long data);
+unsigned long kvm_mmio_read_buf(const void *buf, unsigned int len);
+
+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);
+
static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
unsigned long hyp_stack_ptr,
unsigned long vector_ptr)
diff --git a/arch/arm/include/asm/kvm_hyp.h b/arch/arm/include/asm/kvm_hyp.h
index 40e9034db601..3c1b55ecc578 100644
--- a/arch/arm/include/asm/kvm_hyp.h
+++ b/arch/arm/include/asm/kvm_hyp.h
@@ -10,6 +10,7 @@
#include <linux/compiler.h>
#include <linux/kvm_host.h>
#include <asm/cp15.h>
+#include <asm/kvm_arm.h>
#include <asm/vfp.h>
#define __hyp_text __section(.hyp.text) notrace
diff --git a/arch/arm/include/asm/kvm_mmio.h b/arch/arm/include/asm/kvm_mmio.h
deleted file mode 100644
index 7c0eddb0adb2..000000000000
--- a/arch/arm/include/asm/kvm_mmio.h
+++ /dev/null
@@ -1,26 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) 2012 - Virtual Open Systems and Columbia University
- * Author: Christoffer Dall <c.dall@virtualopensystems.com>
- */
-
-#ifndef __ARM_KVM_MMIO_H__
-#define __ARM_KVM_MMIO_H__
-
-#include <linux/kvm_host.h>
-#include <asm/kvm_asm.h>
-#include <asm/kvm_arm.h>
-
-struct kvm_decode {
- unsigned long rt;
- bool sign_extend;
-};
-
-void kvm_mmio_write_buf(void *buf, unsigned int len, unsigned long data);
-unsigned long kvm_mmio_read_buf(const void *buf, unsigned int len);
-
-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 /* __ARM_KVM_MMIO_H__ */
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 5efe5ca8fecf..688c63412cc2 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -17,7 +17,6 @@
#include <asm/esr.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_hyp.h>
-#include <asm/kvm_mmio.h>
#include <asm/ptrace.h>
#include <asm/cputype.h>
#include <asm/virt.h>
@@ -219,6 +218,38 @@ static inline void vcpu_write_spsr(struct kvm_vcpu *vcpu, unsigned long v)
vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1] = v;
}
+/*
+ * The layout of SPSR for an AArch32 state is different when observed from an
+ * AArch64 SPSR_ELx or an AArch32 SPSR_*. This function generates the AArch32
+ * view given an AArch64 view.
+ *
+ * In ARM DDI 0487E.a see:
+ *
+ * - The AArch64 view (SPSR_EL2) in section C5.2.18, page C5-426
+ * - The AArch32 view (SPSR_abt) in section G8.2.126, page G8-6256
+ * - The AArch32 view (SPSR_und) in section G8.2.132, page G8-6280
+ *
+ * Which show the following differences:
+ *
+ * | Bit | AA64 | AA32 | Notes |
+ * +-----+------+------+-----------------------------|
+ * | 24 | DIT | J | J is RES0 in ARMv8 |
+ * | 21 | SS | DIT | SS doesn't exist in AArch32 |
+ *
+ * ... and all other bits are (currently) common.
+ */
+static inline unsigned long host_spsr_to_spsr32(unsigned long spsr)
+{
+ const unsigned long overlap = BIT(24) | BIT(21);
+ unsigned long dit = !!(spsr & PSR_AA32_DIT_BIT);
+
+ spsr &= ~overlap;
+
+ spsr |= dit << 21;
+
+ return spsr;
+}
+
static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu)
{
u32 mode;
@@ -283,6 +314,11 @@ static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu)
return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SSE);
}
+static inline bool kvm_vcpu_dabt_issf(const struct kvm_vcpu *vcpu)
+{
+ return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SF);
+}
+
static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu)
{
return (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT;
@@ -304,7 +340,7 @@ static inline bool kvm_vcpu_dabt_is_cm(const struct kvm_vcpu *vcpu)
return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_CM);
}
-static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu)
+static inline unsigned int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu)
{
return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT);
}
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index eb992eaa4165..524ab67b73e8 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -24,7 +24,6 @@
#include <asm/fpsimd.h>
#include <asm/kvm.h>
#include <asm/kvm_asm.h>
-#include <asm/kvm_mmio.h>
#include <asm/thread_info.h>
#define __KVM_HAVE_ARCH_INTC_INITIALIZED
@@ -325,9 +324,6 @@ struct kvm_vcpu_arch {
/* Don't run the guest (internal implementation need) */
bool pause;
- /* IO related fields */
- struct kvm_decode mmio_decode;
-
/* Cache some mmu pages needed inside spinlock regions */
struct kvm_mmu_memory_cache mmu_page_cache;
@@ -489,6 +485,14 @@ int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run,
int exception_index);
+/* MMIO helpers */
+void kvm_mmio_write_buf(void *buf, unsigned int len, unsigned long data);
+unsigned long kvm_mmio_read_buf(const void *buf, unsigned int len);
+
+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);
+
int kvm_perf_init(void);
int kvm_perf_teardown(void);
diff --git a/arch/arm64/include/asm/kvm_mmio.h b/arch/arm64/include/asm/kvm_mmio.h
deleted file mode 100644
index 02b5c48fd467..000000000000
--- a/arch/arm64/include/asm/kvm_mmio.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) 2012 - Virtual Open Systems and Columbia University
- * Author: Christoffer Dall <c.dall@virtualopensystems.com>
- */
-
-#ifndef __ARM64_KVM_MMIO_H__
-#define __ARM64_KVM_MMIO_H__
-
-#include <linux/kvm_host.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;
-};
-
-void kvm_mmio_write_buf(void *buf, unsigned int len, unsigned long data);
-unsigned long kvm_mmio_read_buf(const void *buf, unsigned int len);
-
-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/ptrace.h b/arch/arm64/include/asm/ptrace.h
index fbebb411ae20..bf57308fcd63 100644
--- a/arch/arm64/include/asm/ptrace.h
+++ b/arch/arm64/include/asm/ptrace.h
@@ -62,6 +62,7 @@
#define PSR_AA32_I_BIT 0x00000080
#define PSR_AA32_A_BIT 0x00000100
#define PSR_AA32_E_BIT 0x00000200
+#define PSR_AA32_PAN_BIT 0x00400000
#define PSR_AA32_SSBS_BIT 0x00800000
#define PSR_AA32_DIT_BIT 0x01000000
#define PSR_AA32_Q_BIT 0x08000000
diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index 820e5751ada7..ba85bb23f060 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -220,10 +220,18 @@ struct kvm_vcpu_events {
#define KVM_REG_ARM_PTIMER_CVAL ARM64_SYS_REG(3, 3, 14, 2, 2)
#define KVM_REG_ARM_PTIMER_CNT ARM64_SYS_REG(3, 3, 14, 0, 1)
-/* EL0 Virtual Timer Registers */
+/*
+ * EL0 Virtual Timer Registers
+ *
+ * WARNING:
+ * KVM_REG_ARM_TIMER_CVAL and KVM_REG_ARM_TIMER_CNT are not defined
+ * with the appropriate register encodings. Their values have been
+ * accidentally swapped. As this is set API, the definitions here
+ * must be used, rather than ones derived from the encodings.
+ */
#define KVM_REG_ARM_TIMER_CTL ARM64_SYS_REG(3, 3, 14, 3, 1)
-#define KVM_REG_ARM_TIMER_CNT ARM64_SYS_REG(3, 3, 14, 3, 2)
#define KVM_REG_ARM_TIMER_CVAL ARM64_SYS_REG(3, 3, 14, 0, 2)
+#define KVM_REG_ARM_TIMER_CNT ARM64_SYS_REG(3, 3, 14, 3, 2)
/* KVM-as-firmware specific pseudo-registers */
#define KVM_REG_ARM_FW (0x0014 << KVM_REG_ARM_COPROC_SHIFT)
diff --git a/arch/arm64/include/uapi/asm/ptrace.h b/arch/arm64/include/uapi/asm/ptrace.h
index 7ed9294e2004..d1bb5b69f1ce 100644
--- a/arch/arm64/include/uapi/asm/ptrace.h
+++ b/arch/arm64/include/uapi/asm/ptrace.h
@@ -49,6 +49,7 @@
#define PSR_SSBS_BIT 0x00001000
#define PSR_PAN_BIT 0x00400000
#define PSR_UAO_BIT 0x00800000
+#define PSR_DIT_BIT 0x01000000
#define PSR_V_BIT 0x10000000
#define PSR_C_BIT 0x20000000
#define PSR_Z_BIT 0x40000000
diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S
index e5cc8d66bf53..5b76a89939b1 100644
--- a/arch/arm64/kvm/hyp/entry.S
+++ b/arch/arm64/kvm/hyp/entry.S
@@ -44,7 +44,7 @@
* u64 __guest_enter(struct kvm_vcpu *vcpu,
* struct kvm_cpu_context *host_ctxt);
*/
-ENTRY(__guest_enter)
+SYM_FUNC_START(__guest_enter)
// x0: vcpu
// x1: host context
// x2-x17: clobbered by macros
@@ -96,9 +96,8 @@ alternative_else_nop_endif
// Do not touch any register after this!
eret
sb
-ENDPROC(__guest_enter)
-ENTRY(__guest_exit)
+SYM_INNER_LABEL(__guest_exit, SYM_L_GLOBAL)
// x0: return code
// x1: vcpu
// x2-x29,lr: vcpu regs
@@ -192,4 +191,4 @@ abort_guest_exit_end:
msr spsr_el2, x4
orr x0, x0, x5
1: ret
-ENDPROC(__guest_exit)
+SYM_FUNC_END(__guest_enter)
diff --git a/arch/arm64/kvm/inject_fault.c b/arch/arm64/kvm/inject_fault.c
index ccdb6a051ab2..6aafc2825c1c 100644
--- a/arch/arm64/kvm/inject_fault.c
+++ b/arch/arm64/kvm/inject_fault.c
@@ -14,9 +14,6 @@
#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 CURRENT_EL_SP_EL0_VECTOR 0x0
#define CURRENT_EL_SP_ELx_VECTOR 0x200
#define LOWER_EL_AArch64_VECTOR 0x400
@@ -50,6 +47,69 @@ static u64 get_except_vector(struct kvm_vcpu *vcpu, enum exception_type type)
return vcpu_read_sys_reg(vcpu, VBAR_EL1) + exc_offset + type;
}
+/*
+ * When an exception is taken, most PSTATE fields are left unchanged in the
+ * handler. However, some are explicitly overridden (e.g. M[4:0]). Luckily all
+ * of the inherited bits have the same position in the AArch64/AArch32 SPSR_ELx
+ * layouts, so we don't need to shuffle these for exceptions from AArch32 EL0.
+ *
+ * For the SPSR_ELx layout for AArch64, see ARM DDI 0487E.a page C5-429.
+ * For the SPSR_ELx layout for AArch32, see ARM DDI 0487E.a page C5-426.
+ *
+ * Here we manipulate the fields in order of the AArch64 SPSR_ELx layout, from
+ * MSB to LSB.
+ */
+static unsigned long get_except64_pstate(struct kvm_vcpu *vcpu)
+{
+ unsigned long sctlr = vcpu_read_sys_reg(vcpu, SCTLR_EL1);
+ unsigned long old, new;
+
+ old = *vcpu_cpsr(vcpu);
+ new = 0;
+
+ new |= (old & PSR_N_BIT);
+ new |= (old & PSR_Z_BIT);
+ new |= (old & PSR_C_BIT);
+ new |= (old & PSR_V_BIT);
+
+ // TODO: TCO (if/when ARMv8.5-MemTag is exposed to guests)
+
+ new |= (old & PSR_DIT_BIT);
+
+ // PSTATE.UAO is set to zero upon any exception to AArch64
+ // See ARM DDI 0487E.a, page D5-2579.
+
+ // PSTATE.PAN is unchanged unless SCTLR_ELx.SPAN == 0b0
+ // SCTLR_ELx.SPAN is RES1 when ARMv8.1-PAN is not implemented
+ // See ARM DDI 0487E.a, page D5-2578.
+ new |= (old & PSR_PAN_BIT);
+ if (!(sctlr & SCTLR_EL1_SPAN))
+ new |= PSR_PAN_BIT;
+
+ // PSTATE.SS is set to zero upon any exception to AArch64
+ // See ARM DDI 0487E.a, page D2-2452.
+
+ // PSTATE.IL is set to zero upon any exception to AArch64
+ // See ARM DDI 0487E.a, page D1-2306.
+
+ // PSTATE.SSBS is set to SCTLR_ELx.DSSBS upon any exception to AArch64
+ // See ARM DDI 0487E.a, page D13-3258
+ if (sctlr & SCTLR_ELx_DSSBS)
+ new |= PSR_SSBS_BIT;
+
+ // PSTATE.BTYPE is set to zero upon any exception to AArch64
+ // See ARM DDI 0487E.a, pages D1-2293 to D1-2294.
+
+ new |= PSR_D_BIT;
+ new |= PSR_A_BIT;
+ new |= PSR_I_BIT;
+ new |= PSR_F_BIT;
+
+ new |= PSR_MODE_EL1h;
+
+ return new;
+}
+
static void inject_abt64(struct kvm_vcpu *vcpu, bool is_iabt, unsigned long addr)
{
unsigned long cpsr = *vcpu_cpsr(vcpu);
@@ -59,7 +119,7 @@ static void inject_abt64(struct kvm_vcpu *vcpu, bool is_iabt, unsigned long addr
vcpu_write_elr_el1(vcpu, *vcpu_pc(vcpu));
*vcpu_pc(vcpu) = get_except_vector(vcpu, except_type_sync);
- *vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
+ *vcpu_cpsr(vcpu) = get_except64_pstate(vcpu);
vcpu_write_spsr(vcpu, cpsr);
vcpu_write_sys_reg(vcpu, addr, FAR_EL1);
@@ -94,7 +154,7 @@ static void inject_undef64(struct kvm_vcpu *vcpu)
vcpu_write_elr_el1(vcpu, *vcpu_pc(vcpu));
*vcpu_pc(vcpu) = get_except_vector(vcpu, except_type_sync);
- *vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
+ *vcpu_cpsr(vcpu) = get_except64_pstate(vcpu);
vcpu_write_spsr(vcpu, cpsr);
/*
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
index dab1fea4752a..a4f48c1ac28c 100644
--- a/arch/arm64/kvm/va_layout.c
+++ b/arch/arm64/kvm/va_layout.c
@@ -13,52 +13,46 @@
#include <asm/kvm_mmu.h>
/*
- * The LSB of the random hyp VA tag or 0 if no randomization is used.
+ * The LSB of the HYP VA tag
*/
static u8 tag_lsb;
/*
- * The random hyp VA tag value with the region bit if hyp randomization is used
+ * The HYP VA tag value with the region bit
*/
static u64 tag_val;
static u64 va_mask;
+/*
+ * We want to generate a hyp VA with the following format (with V ==
+ * vabits_actual):
+ *
+ * 63 ... V | V-1 | V-2 .. tag_lsb | tag_lsb - 1 .. 0
+ * ---------------------------------------------------------
+ * | 0000000 | hyp_va_msb | random tag | kern linear VA |
+ * |--------- tag_val -----------|----- va_mask ---|
+ *
+ * which does not conflict with the idmap regions.
+ */
__init void kvm_compute_layout(void)
{
phys_addr_t idmap_addr = __pa_symbol(__hyp_idmap_text_start);
u64 hyp_va_msb;
- int kva_msb;
/* Where is my RAM region? */
hyp_va_msb = idmap_addr & BIT(vabits_actual - 1);
hyp_va_msb ^= BIT(vabits_actual - 1);
- kva_msb = fls64((u64)phys_to_virt(memblock_start_of_DRAM()) ^
+ tag_lsb = fls64((u64)phys_to_virt(memblock_start_of_DRAM()) ^
(u64)(high_memory - 1));
- if (kva_msb == (vabits_actual - 1)) {
- /*
- * No space in the address, let's compute the mask so
- * that it covers (vabits_actual - 1) bits, and the region
- * bit. The tag stays set to zero.
- */
- va_mask = BIT(vabits_actual - 1) - 1;
- va_mask |= hyp_va_msb;
- } else {
- /*
- * We do have some free bits to insert a random tag.
- * Hyp VAs are now created from kernel linear map VAs
- * using the following formula (with V == vabits_actual):
- *
- * 63 ... V | V-1 | V-2 .. tag_lsb | tag_lsb - 1 .. 0
- * ---------------------------------------------------------
- * | 0000000 | hyp_va_msb | random tag | kern linear VA |
- */
- tag_lsb = kva_msb;
- va_mask = GENMASK_ULL(tag_lsb - 1, 0);
- tag_val = get_random_long() & GENMASK_ULL(vabits_actual - 2, tag_lsb);
- tag_val |= hyp_va_msb;
- tag_val >>= tag_lsb;
+ va_mask = GENMASK_ULL(tag_lsb - 1, 0);
+ tag_val = hyp_va_msb;
+
+ if (tag_lsb != (vabits_actual - 1)) {
+ /* We have some free bits to insert a random tag. */
+ tag_val |= get_random_long() & GENMASK_ULL(vabits_actual - 2, tag_lsb);
}
+ tag_val >>= tag_lsb;
}
static u32 compute_instruction(int n, u32 rd, u32 rn)
@@ -117,11 +111,11 @@ void __init kvm_update_va_mask(struct alt_instr *alt,
* VHE doesn't need any address translation, let's NOP
* everything.
*
- * Alternatively, if we don't have any spare bits in
- * the address, NOP everything after masking that
- * kernel VA.
+ * Alternatively, if the tag is zero (because the layout
+ * dictates it and we don't have any spare bits in the
+ * address), NOP everything after masking the kernel VA.
*/
- if (has_vhe() || (!tag_lsb && i > 0)) {
+ if (has_vhe() || (!tag_val && i > 0)) {
updptr[i] = cpu_to_le32(aarch64_insn_gen_nop());
continue;
}
diff --git a/virt/kvm/arm/aarch32.c b/virt/kvm/arm/aarch32.c
index c4c57ba99e90..0a356aa91aa1 100644
--- a/virt/kvm/arm/aarch32.c
+++ b/virt/kvm/arm/aarch32.c
@@ -10,10 +10,15 @@
* Author: Christoffer Dall <c.dall@virtualopensystems.com>
*/
+#include <linux/bits.h>
#include <linux/kvm_host.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_hyp.h>
+#define DFSR_FSC_EXTABT_LPAE 0x10
+#define DFSR_FSC_EXTABT_nLPAE 0x08
+#define DFSR_LPAE BIT(9)
+
/*
* Table taken from ARMv8 ARM DDI0487B-B, table G1-10.
*/
@@ -28,25 +33,115 @@ static const u8 return_offsets[8][2] = {
[7] = { 4, 4 }, /* FIQ, unused */
};
+/*
+ * When an exception is taken, most CPSR fields are left unchanged in the
+ * handler. However, some are explicitly overridden (e.g. M[4:0]).
+ *
+ * The SPSR/SPSR_ELx layouts differ, and the below is intended to work with
+ * either format. Note: SPSR.J bit doesn't exist in SPSR_ELx, but this bit was
+ * obsoleted by the ARMv7 virtualization extensions and is RES0.
+ *
+ * For the SPSR layout seen from AArch32, see:
+ * - ARM DDI 0406C.d, page B1-1148
+ * - ARM DDI 0487E.a, page G8-6264
+ *
+ * For the SPSR_ELx layout for AArch32 seen from AArch64, see:
+ * - ARM DDI 0487E.a, page C5-426
+ *
+ * Here we manipulate the fields in order of the AArch32 SPSR_ELx layout, from
+ * MSB to LSB.
+ */
+static unsigned long get_except32_cpsr(struct kvm_vcpu *vcpu, u32 mode)
+{
+ u32 sctlr = vcpu_cp15(vcpu, c1_SCTLR);
+ unsigned long old, new;
+
+ old = *vcpu_cpsr(vcpu);
+ new = 0;
+
+ new |= (old & PSR_AA32_N_BIT);
+ new |= (old & PSR_AA32_Z_BIT);
+ new |= (old & PSR_AA32_C_BIT);
+ new |= (old & PSR_AA32_V_BIT);
+ new |= (old & PSR_AA32_Q_BIT);
+
+ // CPSR.IT[7:0] are set to zero upon any exception
+ // See ARM DDI 0487E.a, section G1.12.3
+ // See ARM DDI 0406C.d, section B1.8.3
+
+ new |= (old & PSR_AA32_DIT_BIT);
+
+ // CPSR.SSBS is set to SCTLR.DSSBS upon any exception
+ // See ARM DDI 0487E.a, page G8-6244
+ if (sctlr & BIT(31))
+ new |= PSR_AA32_SSBS_BIT;
+
+ // CPSR.PAN is unchanged unless SCTLR.SPAN == 0b0
+ // SCTLR.SPAN is RES1 when ARMv8.1-PAN is not implemented
+ // See ARM DDI 0487E.a, page G8-6246
+ new |= (old & PSR_AA32_PAN_BIT);
+ if (!(sctlr & BIT(23)))
+ new |= PSR_AA32_PAN_BIT;
+
+ // SS does not exist in AArch32, so ignore
+
+ // CPSR.IL is set to zero upon any exception
+ // See ARM DDI 0487E.a, page G1-5527
+
+ new |= (old & PSR_AA32_GE_MASK);
+
+ // CPSR.IT[7:0] are set to zero upon any exception
+ // See prior comment above
+
+ // CPSR.E is set to SCTLR.EE upon any exception
+ // See ARM DDI 0487E.a, page G8-6245
+ // See ARM DDI 0406C.d, page B4-1701
+ if (sctlr & BIT(25))
+ new |= PSR_AA32_E_BIT;
+
+ // CPSR.A is unchanged upon an exception to Undefined, Supervisor
+ // CPSR.A is set upon an exception to other modes
+ // See ARM DDI 0487E.a, pages G1-5515 to G1-5516
+ // See ARM DDI 0406C.d, page B1-1182
+ new |= (old & PSR_AA32_A_BIT);
+ if (mode != PSR_AA32_MODE_UND && mode != PSR_AA32_MODE_SVC)
+ new |= PSR_AA32_A_BIT;
+
+ // CPSR.I is set upon any exception
+ // See ARM DDI 0487E.a, pages G1-5515 to G1-5516
+ // See ARM DDI 0406C.d, page B1-1182
+ new |= PSR_AA32_I_BIT;
+
+ // CPSR.F is set upon an exception to FIQ
+ // CPSR.F is unchanged upon an exception to other modes
+ // See ARM DDI 0487E.a, pages G1-5515 to G1-5516
+ // See ARM DDI 0406C.d, page B1-1182
+ new |= (old & PSR_AA32_F_BIT);
+ if (mode == PSR_AA32_MODE_FIQ)
+ new |= PSR_AA32_F_BIT;
+
+ // CPSR.T is set to SCTLR.TE upon any exception
+ // See ARM DDI 0487E.a, page G8-5514
+ // See ARM DDI 0406C.d, page B1-1181
+ if (sctlr & BIT(30))
+ new |= PSR_AA32_T_BIT;
+
+ new |= mode;
+
+ return new;
+}
+
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 & PSR_AA32_T_BIT);
+ unsigned long spsr = *vcpu_cpsr(vcpu);
+ bool is_thumb = (spsr & PSR_AA32_T_BIT);
u32 return_offset = return_offsets[vect_offset >> 2][is_thumb];
u32 sctlr = vcpu_cp15(vcpu, c1_SCTLR);
- cpsr = mode | PSR_AA32_I_BIT;
-
- if (sctlr & (1 << 30))
- cpsr |= PSR_AA32_T_BIT;
- if (sctlr & (1 << 25))
- cpsr |= PSR_AA32_E_BIT;
-
- *vcpu_cpsr(vcpu) = cpsr;
+ *vcpu_cpsr(vcpu) = get_except32_cpsr(vcpu, mode);
/* Note: These now point to the banked copies */
- vcpu_write_spsr(vcpu, new_spsr_value);
+ vcpu_write_spsr(vcpu, host_spsr_to_spsr32(spsr));
*vcpu_reg32(vcpu, 14) = *vcpu_pc(vcpu) + return_offset;
/* Branch to exception vector */
@@ -84,16 +179,18 @@ static void inject_abt32(struct kvm_vcpu *vcpu, bool is_pabt,
fsr = &vcpu_cp15(vcpu, c5_DFSR);
}
- prepare_fault32(vcpu, PSR_AA32_MODE_ABT | PSR_AA32_A_BIT, vect_offset);
+ prepare_fault32(vcpu, PSR_AA32_MODE_ABT, 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;
+ if (is_lpae) {
+ *fsr = DFSR_LPAE | DFSR_FSC_EXTABT_LPAE;
+ } else {
+ /* no need to shuffle FS[4] into DFSR[10] as its 0 */
+ *fsr = DFSR_FSC_EXTABT_nLPAE;
+ }
}
void kvm_inject_dabt32(struct kvm_vcpu *vcpu, unsigned long addr)
diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index 63dd6f27997c..0d9438e9de2a 100644
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -805,6 +805,7 @@ static u64 kvm_arm_timer_read(struct kvm_vcpu *vcpu,
switch (treg) {
case TIMER_REG_TVAL:
val = timer->cnt_cval - kvm_phys_timer_read() + timer->cntvoff;
+ val &= lower_32_bits(val);
break;
case TIMER_REG_CTL:
@@ -850,7 +851,7 @@ static void kvm_arm_timer_write(struct kvm_vcpu *vcpu,
{
switch (treg) {
case TIMER_REG_TVAL:
- timer->cnt_cval = kvm_phys_timer_read() - timer->cntvoff + val;
+ timer->cnt_cval = kvm_phys_timer_read() - timer->cntvoff + (s32)val;
break;
case TIMER_REG_CTL:
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index 3ff510599af6..d65a0faa46d8 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -20,8 +20,6 @@
#include <linux/irqbypass.h>
#include <linux/sched/stat.h>
#include <trace/events/kvm.h>
-#include <kvm/arm_pmu.h>
-#include <kvm/arm_psci.h>
#define CREATE_TRACE_POINTS
#include "trace.h"
@@ -1482,7 +1480,6 @@ static void teardown_hyp_mode(void)
free_hyp_pgds();
for_each_possible_cpu(cpu)
free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
- hyp_cpu_pm_exit();
}
/**
@@ -1696,6 +1693,7 @@ int kvm_arch_init(void *opaque)
return 0;
out_hyp:
+ hyp_cpu_pm_exit();
if (!in_hyp_mode)
teardown_hyp_mode();
out_err:
diff --git a/virt/kvm/arm/mmio.c b/virt/kvm/arm/mmio.c
index 70d3b449692c..aedfcff99ac5 100644
--- a/virt/kvm/arm/mmio.c
+++ b/virt/kvm/arm/mmio.c
@@ -5,7 +5,6 @@
*/
#include <linux/kvm_host.h>
-#include <asm/kvm_mmio.h>
#include <asm/kvm_emulate.h>
#include <trace/events/kvm.h>
@@ -92,23 +91,23 @@ int kvm_handle_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
vcpu->mmio_needed = 0;
- if (!run->mmio.is_write) {
- len = run->mmio.len;
- if (len > sizeof(unsigned long))
- return -EINVAL;
-
+ if (!kvm_vcpu_dabt_iswrite(vcpu)) {
+ len = kvm_vcpu_dabt_get_as(vcpu);
data = kvm_mmio_read_buf(run->mmio.data, len);
- if (vcpu->arch.mmio_decode.sign_extend &&
+ if (kvm_vcpu_dabt_issext(vcpu) &&
len < sizeof(unsigned long)) {
mask = 1U << ((len * 8) - 1);
data = (data ^ mask) - mask;
}
+ if (!kvm_vcpu_dabt_issf(vcpu))
+ data = data & 0xffffffff;
+
trace_kvm_mmio(KVM_TRACE_MMIO_READ, len, run->mmio.phys_addr,
&data);
data = vcpu_data_host_to_guest(vcpu, data, len);
- vcpu_set_reg(vcpu, vcpu->arch.mmio_decode.rt, data);
+ vcpu_set_reg(vcpu, kvm_vcpu_dabt_get_rd(vcpu), data);
}
/*
@@ -120,33 +119,6 @@ int kvm_handle_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
return 0;
}
-static int decode_hsr(struct kvm_vcpu *vcpu, bool *is_write, int *len)
-{
- unsigned long rt;
- int access_size;
- bool sign_extend;
-
- if (kvm_vcpu_dabt_iss1tw(vcpu)) {
- /* page table accesses IO mem: tell guest to fix its TTBR */
- kvm_inject_dabt(vcpu, kvm_vcpu_get_hfar(vcpu));
- return 1;
- }
-
- access_size = kvm_vcpu_dabt_get_as(vcpu);
- if (unlikely(access_size < 0))
- return access_size;
-
- *is_write = kvm_vcpu_dabt_iswrite(vcpu);
- sign_extend = kvm_vcpu_dabt_issext(vcpu);
- rt = kvm_vcpu_dabt_get_rd(vcpu);
-
- *len = access_size;
- vcpu->arch.mmio_decode.sign_extend = sign_extend;
- vcpu->arch.mmio_decode.rt = rt;
-
- return 0;
-}
-
int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
phys_addr_t fault_ipa)
{
@@ -158,15 +130,10 @@ int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
u8 data_buf[8];
/*
- * Prepare MMIO operation. First decode the syndrome data we get
- * from the CPU. Then try if some in-kernel emulation feels
- * responsible, otherwise let user space do its magic.
+ * No valid syndrome? Ask userspace for help if it has
+ * voluntered to do so, and bail out otherwise.
*/
- if (kvm_vcpu_dabt_isvalid(vcpu)) {
- ret = decode_hsr(vcpu, &is_write, &len);
- if (ret)
- return ret;
- } else {
+ if (!kvm_vcpu_dabt_isvalid(vcpu)) {
if (vcpu->kvm->arch.return_nisv_io_abort_to_user) {
run->exit_reason = KVM_EXIT_ARM_NISV;
run->arm_nisv.esr_iss = kvm_vcpu_dabt_iss_nisv_sanitized(vcpu);
@@ -178,7 +145,20 @@ int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
return -ENOSYS;
}
- rt = vcpu->arch.mmio_decode.rt;
+ /* Page table accesses IO mem: tell guest to fix its TTBR */
+ if (kvm_vcpu_dabt_iss1tw(vcpu)) {
+ kvm_inject_dabt(vcpu, kvm_vcpu_get_hfar(vcpu));
+ return 1;
+ }
+
+ /*
+ * Prepare MMIO operation. First decode the syndrome data we get
+ * from the CPU. Then try if some in-kernel emulation feels
+ * responsible, otherwise let user space do its magic.
+ */
+ is_write = kvm_vcpu_dabt_iswrite(vcpu);
+ len = kvm_vcpu_dabt_get_as(vcpu);
+ rt = kvm_vcpu_dabt_get_rd(vcpu);
if (is_write) {
data = vcpu_data_guest_to_host(vcpu, vcpu_get_reg(vcpu, rt),
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index dc8254bf30ea..19c961ac4e3c 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -14,7 +14,6 @@
#include <asm/cacheflush.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_mmu.h>
-#include <asm/kvm_mmio.h>
#include <asm/kvm_ras.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_emulate.h>
@@ -1590,16 +1589,8 @@ static void invalidate_icache_guest_page(kvm_pfn_t pfn, unsigned long size)
__invalidate_icache_guest_page(pfn, size);
}
-static void kvm_send_hwpoison_signal(unsigned long address,
- struct vm_area_struct *vma)
+static void kvm_send_hwpoison_signal(unsigned long address, short lsb)
{
- short lsb;
-
- if (is_vm_hugetlb_page(vma))
- lsb = huge_page_shift(hstate_vma(vma));
- else
- lsb = PAGE_SHIFT;
-
send_sig_mceerr(BUS_MCEERR_AR, (void __user *)address, lsb, current);
}
@@ -1672,6 +1663,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
struct kvm *kvm = vcpu->kvm;
struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache;
struct vm_area_struct *vma;
+ short vma_shift;
kvm_pfn_t pfn;
pgprot_t mem_type = PAGE_S2;
bool logging_active = memslot_is_logging(memslot);
@@ -1695,7 +1687,12 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
return -EFAULT;
}
- vma_pagesize = vma_kernel_pagesize(vma);
+ if (is_vm_hugetlb_page(vma))
+ vma_shift = huge_page_shift(hstate_vma(vma));
+ else
+ vma_shift = PAGE_SHIFT;
+
+ vma_pagesize = 1ULL << vma_shift;
if (logging_active ||
(vma->vm_flags & VM_PFNMAP) ||
!fault_supports_stage2_huge_mapping(memslot, hva, vma_pagesize)) {
@@ -1735,7 +1732,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
pfn = gfn_to_pfn_prot(kvm, gfn, write_fault, &writable);
if (pfn == KVM_PFN_ERR_HWPOISON) {
- kvm_send_hwpoison_signal(hva, vma);
+ kvm_send_hwpoison_signal(hva, vma_shift);
return 0;
}
if (is_error_noslot_pfn(pfn))
@@ -2141,7 +2138,8 @@ int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
if (!kvm->arch.pgd)
return 0;
trace_kvm_test_age_hva(hva);
- return handle_hva_to_gpa(kvm, hva, hva, kvm_test_age_hva_handler, NULL);
+ return handle_hva_to_gpa(kvm, hva, hva + PAGE_SIZE,
+ kvm_test_age_hva_handler, NULL);
}
void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu)
diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c
index 8731dfeced8b..f0d0312c0a55 100644
--- a/virt/kvm/arm/pmu.c
+++ b/virt/kvm/arm/pmu.c
@@ -15,6 +15,8 @@
#include <kvm/arm_vgic.h>
static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx);
+static void kvm_pmu_update_pmc_chained(struct kvm_vcpu *vcpu, u64 select_idx);
+static void kvm_pmu_stop_counter(struct kvm_vcpu *vcpu, struct kvm_pmc *pmc);
#define PERF_ATTR_CFG1_KVM_PMU_CHAINED 0x1
@@ -75,6 +77,13 @@ static struct kvm_pmc *kvm_pmu_get_canonical_pmc(struct kvm_pmc *pmc)
return pmc;
}
+static struct kvm_pmc *kvm_pmu_get_alternate_pmc(struct kvm_pmc *pmc)
+{
+ if (kvm_pmu_idx_is_high_counter(pmc->idx))
+ return pmc - 1;
+ else
+ return pmc + 1;
+}
/**
* kvm_pmu_idx_has_chain_evtype - determine if the event type is chain
@@ -238,10 +247,11 @@ void kvm_pmu_vcpu_init(struct kvm_vcpu *vcpu)
*/
void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu)
{
- int i;
+ unsigned long mask = kvm_pmu_valid_counter_mask(vcpu);
struct kvm_pmu *pmu = &vcpu->arch.pmu;
+ int i;
- for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++)
+ for_each_set_bit(i, &mask, 32)
kvm_pmu_stop_counter(vcpu, &pmu->pmc[i]);
bitmap_zero(vcpu->arch.pmu.chained, ARMV8_PMU_MAX_COUNTER_PAIRS);
@@ -294,15 +304,9 @@ void kvm_pmu_enable_counter_mask(struct kvm_vcpu *vcpu, u64 val)
pmc = &pmu->pmc[i];
- /*
- * For high counters of chained events we must recreate the
- * perf event with the long (64bit) attribute set.
- */
- if (kvm_pmu_pmc_is_chained(pmc) &&
- kvm_pmu_idx_is_high_counter(i)) {
- kvm_pmu_create_perf_event(vcpu, i);
- continue;
- }
+ /* A change in the enable state may affect the chain state */
+ kvm_pmu_update_pmc_chained(vcpu, i);
+ kvm_pmu_create_perf_event(vcpu, i);
/* At this point, pmc must be the canonical */
if (pmc->perf_event) {
@@ -335,15 +339,9 @@ void kvm_pmu_disable_counter_mask(struct kvm_vcpu *vcpu, u64 val)
pmc = &pmu->pmc[i];
- /*
- * For high counters of chained events we must recreate the
- * perf event with the long (64bit) attribute unset.
- */
- if (kvm_pmu_pmc_is_chained(pmc) &&
- kvm_pmu_idx_is_high_counter(i)) {
- kvm_pmu_create_perf_event(vcpu, i);
- continue;
- }
+ /* A change in the enable state may affect the chain state */
+ kvm_pmu_update_pmc_chained(vcpu, i);
+ kvm_pmu_create_perf_event(vcpu, i);
/* At this point, pmc must be the canonical */
if (pmc->perf_event)
@@ -480,25 +478,45 @@ static void kvm_pmu_perf_overflow(struct perf_event *perf_event,
*/
void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val)
{
+ struct kvm_pmu *pmu = &vcpu->arch.pmu;
int i;
- u64 type, enable, reg;
- if (val == 0)
+ if (!(__vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E))
return;
- enable = __vcpu_sys_reg(vcpu, PMCNTENSET_EL0);
+ /* Weed out disabled counters */
+ val &= __vcpu_sys_reg(vcpu, PMCNTENSET_EL0);
+
for (i = 0; i < ARMV8_PMU_CYCLE_IDX; i++) {
+ u64 type, reg;
+
if (!(val & BIT(i)))
continue;
- type = __vcpu_sys_reg(vcpu, PMEVTYPER0_EL0 + i)
- & ARMV8_PMU_EVTYPE_EVENT;
- if ((type == ARMV8_PMUV3_PERFCTR_SW_INCR)
- && (enable & BIT(i))) {
- reg = __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) + 1;
+
+ /* PMSWINC only applies to ... SW_INC! */
+ type = __vcpu_sys_reg(vcpu, PMEVTYPER0_EL0 + i);
+ type &= ARMV8_PMU_EVTYPE_EVENT;
+ if (type != ARMV8_PMUV3_PERFCTR_SW_INCR)
+ continue;
+
+ /* increment this even SW_INC counter */
+ reg = __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) + 1;
+ reg = lower_32_bits(reg);
+ __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) = reg;
+
+ if (reg) /* no overflow on the low part */
+ continue;
+
+ if (kvm_pmu_pmc_is_chained(&pmu->pmc[i])) {
+ /* increment the high counter */
+ reg = __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i + 1) + 1;
reg = lower_32_bits(reg);
- __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) = reg;
- if (!reg)
- __vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= BIT(i);
+ __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i + 1) = reg;
+ if (!reg) /* mark overflow on the high counter */
+ __vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= BIT(i + 1);
+ } else {
+ /* mark overflow on low counter */
+ __vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= BIT(i);
}
}
}
@@ -510,10 +528,9 @@ void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val)
*/
void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val)
{
- u64 mask;
+ unsigned long mask = kvm_pmu_valid_counter_mask(vcpu);
int i;
- mask = kvm_pmu_valid_counter_mask(vcpu);
if (val & ARMV8_PMU_PMCR_E) {
kvm_pmu_enable_counter_mask(vcpu,
__vcpu_sys_reg(vcpu, PMCNTENSET_EL0) & mask);
@@ -525,7 +542,7 @@ void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val)
kvm_pmu_set_counter_value(vcpu, ARMV8_PMU_CYCLE_IDX, 0);
if (val & ARMV8_PMU_PMCR_P) {
- for (i = 0; i < ARMV8_PMU_CYCLE_IDX; i++)
+ for_each_set_bit(i, &mask, 32)
kvm_pmu_set_counter_value(vcpu, i, 0);
}
}
@@ -582,15 +599,14 @@ static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx)
counter = kvm_pmu_get_pair_counter_value(vcpu, pmc);
- if (kvm_pmu_idx_has_chain_evtype(vcpu, pmc->idx)) {
+ if (kvm_pmu_pmc_is_chained(pmc)) {
/**
* The initial sample period (overflow count) of an event. For
* chained counters we only support overflow interrupts on the
* high counter.
*/
attr.sample_period = (-counter) & GENMASK(63, 0);
- if (kvm_pmu_counter_is_enabled(vcpu, pmc->idx + 1))
- attr.config1 |= PERF_ATTR_CFG1_KVM_PMU_CHAINED;
+ attr.config1 |= PERF_ATTR_CFG1_KVM_PMU_CHAINED;
event = perf_event_create_kernel_counter(&attr, -1, current,
kvm_pmu_perf_overflow,
@@ -621,25 +637,33 @@ static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx)
* @select_idx: The number of selected counter
*
* Update the chained bitmap based on the event type written in the
- * typer register.
+ * typer register and the enable state of the odd register.
*/
static void kvm_pmu_update_pmc_chained(struct kvm_vcpu *vcpu, u64 select_idx)
{
struct kvm_pmu *pmu = &vcpu->arch.pmu;
- struct kvm_pmc *pmc = &pmu->pmc[select_idx];
+ struct kvm_pmc *pmc = &pmu->pmc[select_idx], *canonical_pmc;
+ bool new_state, old_state;
+
+ old_state = kvm_pmu_pmc_is_chained(pmc);
+ new_state = kvm_pmu_idx_has_chain_evtype(vcpu, pmc->idx) &&
+ kvm_pmu_counter_is_enabled(vcpu, pmc->idx | 0x1);
+
+ if (old_state == new_state)
+ return;
- if (kvm_pmu_idx_has_chain_evtype(vcpu, pmc->idx)) {
+ canonical_pmc = kvm_pmu_get_canonical_pmc(pmc);
+ kvm_pmu_stop_counter(vcpu, canonical_pmc);
+ if (new_state) {
/*
* During promotion from !chained to chained we must ensure
* the adjacent counter is stopped and its event destroyed
*/
- if (!kvm_pmu_pmc_is_chained(pmc))
- kvm_pmu_stop_counter(vcpu, pmc);
-
+ kvm_pmu_stop_counter(vcpu, kvm_pmu_get_alternate_pmc(pmc));
set_bit(pmc->idx >> 1, vcpu->arch.pmu.chained);
- } else {
- clear_bit(pmc->idx >> 1, vcpu->arch.pmu.chained);
+ return;
}
+ clear_bit(pmc->idx >> 1, vcpu->arch.pmu.chained);
}
/**
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 98c7360d9fb7..d53d34a33e35 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -839,9 +839,8 @@ static int vgic_its_cmd_handle_discard(struct kvm *kvm, struct vgic_its *its,
u32 event_id = its_cmd_get_id(its_cmd);
struct its_ite *ite;
-
ite = find_ite(its, device_id, event_id);
- if (ite && ite->collection) {
+ if (ite && its_is_collection_mapped(ite->collection)) {
/*
* Though the spec talks about removing the pending state, we
* don't bother here since we clear the ITTE anyway and the
@@ -2475,7 +2474,8 @@ static int vgic_its_restore_cte(struct vgic_its *its, gpa_t gpa, int esz)
target_addr = (u32)(val >> KVM_ITS_CTE_RDBASE_SHIFT);
coll_id = val & KVM_ITS_CTE_ICID_MASK;
- if (target_addr >= atomic_read(&kvm->online_vcpus))
+ if (target_addr != COLLECTION_NOT_MAPPED &&
+ target_addr >= atomic_read(&kvm->online_vcpus))
return -EINVAL;
collection = find_collection(its, coll_id);
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c
index 7dfd15dbb308..ebc218840fc2 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v3.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c
@@ -414,8 +414,11 @@ static unsigned long vgic_mmio_read_pendbase(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+ u64 value = vgic_cpu->pendbaser;
- return extract_bytes(vgic_cpu->pendbaser, addr & 7, len);
+ value &= ~GICR_PENDBASER_PTZ;
+
+ return extract_bytes(value, addr & 7, len);
}
static void vgic_mmio_write_pendbase(struct kvm_vcpu *vcpu,
diff --git a/virt/kvm/arm/vgic/vgic-mmio.h b/virt/kvm/arm/vgic/vgic-mmio.h
index 836f418f1ee8..5af2aefad435 100644
--- a/virt/kvm/arm/vgic/vgic-mmio.h
+++ b/virt/kvm/arm/vgic/vgic-mmio.h
@@ -98,11 +98,6 @@ extern struct kvm_io_device_ops kvm_io_gic_ops;
.uaccess_write = uwr, \
}
-int kvm_vgic_register_mmio_region(struct kvm *kvm, struct kvm_vcpu *vcpu,
- struct vgic_register_region *reg_desc,
- struct vgic_io_device *region,
- int nr_irqs, bool offset_private);
-
unsigned long vgic_data_mmio_bus_to_host(const void *val, unsigned int len);
void vgic_data_host_to_mmio_bus(void *buf, unsigned int len,