This new IOCTL exports user-invisible states related to SError. Together with appropriate user space changes, it can inject SError with specified syndrome to guest by setup kvm_vcpu_events value. Also it can support live migration. Signed-off-by: Dongjiu Geng <gengdongjiu@xxxxxxxxxx> Change since V10: Address James's comments, thanks James 1. Merge the helper function with the user. 2. Move the ISS_MASK into pend_guest_serror() to clear top bits 3. Make kvm_vcpu_events struct align to 4 bytes 4. Add something check in the kvm_arm_vcpu_set_events() 5. Check kvm_arm_vcpu_get/set_events()'s return value. 6. Initialise kvm_vcpu_events to 0 so that padding transferred to user-space doesn't contain kernel stack. --- Documentation/virtual/kvm/api.txt | 28 ++++++++++++++++++++++++++-- arch/arm/include/asm/kvm_host.h | 6 ++++++ arch/arm/kvm/guest.c | 12 ++++++++++++ arch/arm64/include/asm/kvm_emulate.h | 5 +++++ arch/arm64/include/asm/kvm_host.h | 7 +++++++ arch/arm64/include/uapi/asm/kvm.h | 12 ++++++++++++ arch/arm64/kvm/guest.c | 31 +++++++++++++++++++++++++++++++ arch/arm64/kvm/inject_fault.c | 7 ++++++- arch/arm64/kvm/reset.c | 1 + virt/kvm/arm/arm.c | 21 +++++++++++++++++++++ 10 files changed, 127 insertions(+), 3 deletions(-) diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 8a3d708..45719b4 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -819,11 +819,13 @@ struct kvm_clock_data { Capability: KVM_CAP_VCPU_EVENTS Extended by: KVM_CAP_INTR_SHADOW -Architectures: x86 +Architectures: x86, arm, arm64 Type: vm ioctl Parameters: struct kvm_vcpu_event (out) Returns: 0 on success, -1 on error +X86: + Gets currently pending exceptions, interrupts, and NMIs as well as related states of the vcpu. @@ -865,15 +867,31 @@ Only two fields are defined in the flags field: - KVM_VCPUEVENT_VALID_SMM may be set in the flags field to signal that smi contains a valid state. +ARM, ARM64: + +Gets currently pending SError exceptions as well as related states of the vcpu. + +struct kvm_vcpu_events { + struct { + __u8 serror_pending; + __u8 serror_has_esr; + /* Align it to 4 bytes */ + __u8 pad[2]; + __u64 serror_esr; + } exception; +}; + 4.32 KVM_SET_VCPU_EVENTS Capability: KVM_CAP_VCPU_EVENTS Extended by: KVM_CAP_INTR_SHADOW -Architectures: x86 +Architectures: x86, arm, arm64 Type: vm ioctl Parameters: struct kvm_vcpu_event (in) Returns: 0 on success, -1 on error +X86: + Set pending exceptions, interrupts, and NMIs as well as related states of the vcpu. @@ -894,6 +912,12 @@ shall be written into the VCPU. KVM_VCPUEVENT_VALID_SMM can only be set if KVM_CAP_X86_SMM is available. +ARM, ARM64: + +Set pending SError exceptions as well as related states of the vcpu. + +See KVM_GET_VCPU_EVENTS for the data structure. + 4.33 KVM_GET_DEBUGREGS diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index ef54013..d81621e 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -211,6 +211,12 @@ struct kvm_vcpu_stat { int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices); 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); +int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu, + struct kvm_vcpu_events *events); + +int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu, + struct kvm_vcpu_events *events); + unsigned long kvm_call_hyp(void *hypfn, ...); void force_vm_exit(const cpumask_t *mask); diff --git a/arch/arm/kvm/guest.c b/arch/arm/kvm/guest.c index 1e0784e..39f895d 100644 --- a/arch/arm/kvm/guest.c +++ b/arch/arm/kvm/guest.c @@ -248,6 +248,18 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, return -EINVAL; } +int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu, + struct kvm_vcpu_events *events) +{ + return -EINVAL; +} + +int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu, + struct kvm_vcpu_events *events) +{ + return -EINVAL; +} + int __attribute_const__ kvm_target_cpu(void) { switch (read_cpuid_part()) { diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h index 413dc82..3294885 100644 --- a/arch/arm64/include/asm/kvm_emulate.h +++ b/arch/arm64/include/asm/kvm_emulate.h @@ -71,6 +71,11 @@ static inline void vcpu_set_hcr(struct kvm_vcpu *vcpu, unsigned long hcr) vcpu->arch.hcr_el2 = hcr; } +static inline unsigned long vcpu_get_vsesr(struct kvm_vcpu *vcpu) +{ + return vcpu->arch.vsesr_el2; +} + static inline void vcpu_set_vsesr(struct kvm_vcpu *vcpu, u64 vsesr) { vcpu->arch.vsesr_el2 = vsesr; diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index a73f63a..1125540 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -326,6 +326,11 @@ struct kvm_vcpu_stat { int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices); 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); +int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu, + struct kvm_vcpu_events *events); + +int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu, + struct kvm_vcpu_events *events); #define KVM_ARCH_WANT_MMU_NOTIFIER int kvm_unmap_hva(struct kvm *kvm, unsigned long hva); @@ -354,6 +359,8 @@ void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run, int kvm_perf_init(void); int kvm_perf_teardown(void); +void kvm_set_sei_esr(struct kvm_vcpu *vcpu, u64 syndrome); + struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr); static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr, diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index 9abbf30..855cc9a 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -39,6 +39,7 @@ #define __KVM_HAVE_GUEST_DEBUG #define __KVM_HAVE_IRQ_LINE #define __KVM_HAVE_READONLY_MEM +#define __KVM_HAVE_VCPU_EVENTS #define KVM_COALESCED_MMIO_PAGE_OFFSET 1 @@ -153,6 +154,17 @@ struct kvm_sync_regs { struct kvm_arch_memory_slot { }; +/* for KVM_GET/SET_VCPU_EVENTS */ +struct kvm_vcpu_events { + struct { + __u8 serror_pending; + __u8 serror_has_esr; + /* Align it to 4 bytes */ + __u8 pad[2]; + __u64 serror_esr; + } exception; +}; + /* 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 diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 5c7f657..42e1222 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -277,6 +277,37 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, return -EINVAL; } +int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu, + struct kvm_vcpu_events *events) +{ + events->exception.serror_pending = (vcpu_get_hcr(vcpu) & HCR_VSE); + events->exception.serror_has_esr = + cpus_have_const_cap(ARM64_HAS_RAS_EXTN) && + (!!vcpu_get_vsesr(vcpu)); + events->exception.serror_esr = vcpu_get_vsesr(vcpu); + + return 0; +} + +int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu, + struct kvm_vcpu_events *events) +{ + bool injected = events->exception.serror_pending; + bool has_esr = events->exception.serror_has_esr; + + if (injected && has_esr) { + if (!cpus_have_const_cap(ARM64_HAS_RAS_EXTN)) + return -EINVAL; + + kvm_set_sei_esr(vcpu, events->exception.serror_esr); + + } else if (injected) { + kvm_inject_vabt(vcpu); + } + + return 0; +} + int __attribute_const__ kvm_target_cpu(void) { unsigned long implementor = read_cpuid_implementor(); diff --git a/arch/arm64/kvm/inject_fault.c b/arch/arm64/kvm/inject_fault.c index 60666a0..aa0358a 100644 --- a/arch/arm64/kvm/inject_fault.c +++ b/arch/arm64/kvm/inject_fault.c @@ -166,7 +166,7 @@ void kvm_inject_undefined(struct kvm_vcpu *vcpu) static void pend_guest_serror(struct kvm_vcpu *vcpu, u64 esr) { - vcpu_set_vsesr(vcpu, esr); + vcpu_set_vsesr(vcpu, esr & ESR_ELx_ISS_MASK); vcpu_set_hcr(vcpu, vcpu_get_hcr(vcpu) | HCR_VSE); } @@ -186,3 +186,8 @@ void kvm_inject_vabt(struct kvm_vcpu *vcpu) { pend_guest_serror(vcpu, ESR_ELx_ISV); } + +void kvm_set_sei_esr(struct kvm_vcpu *vcpu, u64 syndrome) +{ + pend_guest_serror(vcpu, syndrome); +} diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index 38c8a64..20e919a 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -82,6 +82,7 @@ int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext) break; case KVM_CAP_SET_GUEST_DEBUG: case KVM_CAP_VCPU_ATTRIBUTES: + case KVM_CAP_VCPU_EVENTS: r = 1; break; default: diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c index 7e3941f..945655d 100644 --- a/virt/kvm/arm/arm.c +++ b/virt/kvm/arm/arm.c @@ -1051,6 +1051,27 @@ long kvm_arch_vcpu_ioctl(struct file *filp, return -EFAULT; return kvm_arm_vcpu_has_attr(vcpu, &attr); } + case KVM_GET_VCPU_EVENTS: { + struct kvm_vcpu_events events; + + memset(&events, 0, sizeof(struct kvm_vcpu_events)); + if (kvm_arm_vcpu_get_events(vcpu, &events)) + return -EINVAL; + + if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events))) + return -EFAULT; + + return 0; + } + case KVM_SET_VCPU_EVENTS: { + struct kvm_vcpu_events events; + + if (copy_from_user(&events, argp, + sizeof(struct kvm_vcpu_events))) + return -EFAULT; + + return kvm_arm_vcpu_set_events(vcpu, &events); + } default: return -EINVAL; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html