| Message ID | 1527772139-19665-3-git-send-email-gengdongjiu@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 31/05/18 14:08, Dongjiu Geng wrote: > For the migrating VMs, user space may need to know the exception > state. For example, in the machine A, KVM make an SError pending, > when migrate to B, KVM also needs to pend an SError. > > This new IOCTL exports user-invisible states related to SError. > Together with appropriate user space changes, user space can get/set > the SError exception state to do migrate/snapshot/suspend. > > Signed-off-by: Dongjiu Geng <gengdongjiu@huawei.com> > -- > this series patch is separated from https://www.spinics.net/lists/kvm/msg168917.html > change since V12: > 1. change (vcpu->arch.hcr_el2 & HCR_VSE) to !!(vcpu->arch.hcr_el2 & HCR_VSE) in kvm_arm_vcpu_get_events() > > Change since V11: > Address James's comments, thanks James > 1. Align the struct of kvm_vcpu_events to 64 bytes > 2. Avoid exposing the stale ESR value in the kvm_arm_vcpu_get_events() > 3. Change variables 'injected' name to 'serror_pending' in the kvm_arm_vcpu_set_events() > 4. Change to sizeof(events) from sizeof(struct kvm_vcpu_events) in kvm_arch_vcpu_ioctl() > > 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 | 31 ++++++++++++++++++++++++++++--- > 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 | 13 +++++++++++++ > arch/arm64/kvm/guest.c | 36 ++++++++++++++++++++++++++++++++++++ > arch/arm64/kvm/inject_fault.c | 7 ++++++- > arch/arm64/kvm/reset.c | 1 + > virt/kvm/arm/arm.c | 21 +++++++++++++++++++++ > 10 files changed, 135 insertions(+), 4 deletions(-) > > diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt > index fdac969..8896737 100644 > --- a/Documentation/virtual/kvm/api.txt > +++ b/Documentation/virtual/kvm/api.txt > @@ -835,11 +835,13 @@ 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. > > @@ -881,15 +883,32 @@ 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 8 bytes */ > + __u8 pad[6]; > + __u64 serror_esr; > + } exception; > + __u32 reserved[12]; > +}; > + > 4.32 KVM_SET_VCPU_EVENTS > > -Capability: KVM_CAP_VCPU_EVENTS > +Capebility: 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. > > @@ -910,6 +929,12 @@ 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 c7c28c8..39f9901 100644 > --- a/arch/arm/include/asm/kvm_host.h > +++ b/arch/arm/include/asm/kvm_host.h > @@ -213,6 +213,12 @@ unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu); > 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 a18f33e..c685f0e 100644 > --- a/arch/arm/kvm/guest.c > +++ b/arch/arm/kvm/guest.c > @@ -261,6 +261,18 @@ 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 1dab3a9..18f61ff 100644 > --- a/arch/arm64/include/asm/kvm_emulate.h > +++ b/arch/arm64/include/asm/kvm_emulate.h > @@ -81,6 +81,11 @@ static inline unsigned long *vcpu_hcr(struct kvm_vcpu *vcpu) > return (unsigned long *)&vcpu->arch.hcr_el2; > } > > +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 469de8a..357304a 100644 > --- a/arch/arm64/include/asm/kvm_host.h > +++ b/arch/arm64/include/asm/kvm_host.h > @@ -335,6 +335,11 @@ unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu); > 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); > @@ -363,6 +368,8 @@ 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); > > void __kvm_set_tpidr_el2(u64 tpidr_el2); > diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h > index 04b3256..df4faee 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 +154,18 @@ 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 8 bytes */ > + __u8 pad[6]; > + __u64 serror_esr; > + } exception; > + __u32 reserved[12]; > +}; > + > /* 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 56a0260..71d3841 100644 > --- a/arch/arm64/kvm/guest.c > +++ b/arch/arm64/kvm/guest.c > @@ -289,6 +289,42 @@ 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->arch.hcr_el2 & HCR_VSE); > + events->exception.serror_has_esr = > + cpus_have_const_cap(ARM64_HAS_RAS_EXTN) && > + (!!vcpu_get_vsesr(vcpu)); This is odd. Isn't VSESR==0 a valid value? And isn't serror_has_esr always true when ARM64_HAS_RAS_EXTN is set? > + > + if (events->exception.serror_pending && > + events->exception.serror_has_esr) > + events->exception.serror_esr = vcpu_get_vsesr(vcpu); > + else > + events->exception.serror_esr = 0; > + > + return 0; > +} > + > +int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu, > + struct kvm_vcpu_events *events) > +{ > + bool serror_pending = events->exception.serror_pending; > + bool has_esr = events->exception.serror_has_esr; > + > + if (serror_pending && has_esr) { > + if (!cpus_have_const_cap(ARM64_HAS_RAS_EXTN)) > + return -EINVAL; > + > + kvm_set_sei_esr(vcpu, events->exception.serror_esr); > + Spurious blank line > + } else if (serror_pending) { > + 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 d8e7165..9e0ca56 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_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); > +} I think it'd make more sense to rename pend_guest_serror to kvm_set_sei_esr and be done with it. > 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 a4c1b76..8b43968 100644 > --- a/virt/kvm/arm/arm.c > +++ b/virt/kvm/arm/arm.c > @@ -1107,6 +1107,27 @@ long kvm_arch_vcpu_ioctl(struct file *filp, > r = kvm_arm_vcpu_has_attr(vcpu, &attr); > break; > } > + case KVM_GET_VCPU_EVENTS: { > + struct kvm_vcpu_events events; > + > + memset(&events, 0, sizeof(events)); You could write this as struct kvm_cpu_events events = { }; but it'd make more sense if kvm_arm_vcpu_get_events() did all the work rather than having this split responsibility. > + if (kvm_arm_vcpu_get_events(vcpu, &events)) > + return -EINVAL; > + > + if (copy_to_user(argp, &events, sizeof(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))) Prefer using sizeof(events) instead. > + return -EFAULT; > + > + return kvm_arm_vcpu_set_events(vcpu, &events); > + } > default: > r = -EINVAL; > } > Thanks, M.
On Wed, May 30, 2018 at 10:04 PM Dongjiu Geng <gengdongjiu@huawei.com> wrote: > > For the migrating VMs, user space may need to know the exception > state. For example, in the machine A, KVM make an SError pending, > when migrate to B, KVM also needs to pend an SError. > > This new IOCTL exports user-invisible states related to SError. > Together with appropriate user space changes, user space can get/set > the SError exception state to do migrate/snapshot/suspend. > > Signed-off-by: Dongjiu Geng <gengdongjiu@huawei.com> > -- > this series patch is separated from https://www.spinics.net/lists/kvm/msg168917.html > change since V12: > 1. change (vcpu->arch.hcr_el2 & HCR_VSE) to !!(vcpu->arch.hcr_el2 & HCR_VSE) in kvm_arm_vcpu_get_events() > > Change since V11: > Address James's comments, thanks James > 1. Align the struct of kvm_vcpu_events to 64 bytes > 2. Avoid exposing the stale ESR value in the kvm_arm_vcpu_get_events() > 3. Change variables 'injected' name to 'serror_pending' in the kvm_arm_vcpu_set_events() > 4. Change to sizeof(events) from sizeof(struct kvm_vcpu_events) in kvm_arch_vcpu_ioctl() > > 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 | 31 ++++++++++++++++++++++++++++--- > 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 | 13 +++++++++++++ > arch/arm64/kvm/guest.c | 36 ++++++++++++++++++++++++++++++++++++ > arch/arm64/kvm/inject_fault.c | 7 ++++++- > arch/arm64/kvm/reset.c | 1 + > virt/kvm/arm/arm.c | 21 +++++++++++++++++++++ > 10 files changed, 135 insertions(+), 4 deletions(-) > > diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt > index fdac969..8896737 100644 > --- a/Documentation/virtual/kvm/api.txt > +++ b/Documentation/virtual/kvm/api.txt > @@ -835,11 +835,13 @@ 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. > > @@ -881,15 +883,32 @@ 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 8 bytes */ > + __u8 pad[6]; > + __u64 serror_esr; > + } exception; > + __u32 reserved[12]; > > +}; > + > 4.32 KVM_SET_VCPU_EVENTS > > -Capability: KVM_CAP_VCPU_EVENTS > +Capebility: 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. > > @@ -910,6 +929,12 @@ 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 c7c28c8..39f9901 100644 > --- a/arch/arm/include/asm/kvm_host.h > +++ b/arch/arm/include/asm/kvm_host.h > @@ -213,6 +213,12 @@ unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu); > 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 a18f33e..c685f0e 100644 > --- a/arch/arm/kvm/guest.c > +++ b/arch/arm/kvm/guest.c > @@ -261,6 +261,18 @@ 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 1dab3a9..18f61ff 100644 > --- a/arch/arm64/include/asm/kvm_emulate.h > +++ b/arch/arm64/include/asm/kvm_emulate.h > @@ -81,6 +81,11 @@ static inline unsigned long *vcpu_hcr(struct kvm_vcpu *vcpu) > return (unsigned long *)&vcpu->arch.hcr_el2; > } > > +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 469de8a..357304a 100644 > --- a/arch/arm64/include/asm/kvm_host.h > +++ b/arch/arm64/include/asm/kvm_host.h > @@ -335,6 +335,11 @@ unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu); > 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); > @@ -363,6 +368,8 @@ 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); > > void __kvm_set_tpidr_el2(u64 tpidr_el2); > diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h > index 04b3256..df4faee 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 +154,18 @@ 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 8 bytes */ > + __u8 pad[6]; > + __u64 serror_esr; > + } exception; > + __u32 reserved[12]; It will be easier to re-purpose this in the future if the field is reserved and is checked that it must be zero. SET_VCPU_EVENTS would return EINVAL if reserved fields get used until a later meaning is defined for them. > +}; > + > /* 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 56a0260..71d3841 100644 > --- a/arch/arm64/kvm/guest.c > +++ b/arch/arm64/kvm/guest.c > @@ -289,6 +289,42 @@ 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->arch.hcr_el2 & HCR_VSE); > + events->exception.serror_has_esr = > + cpus_have_const_cap(ARM64_HAS_RAS_EXTN) && > + (!!vcpu_get_vsesr(vcpu)); > + > + if (events->exception.serror_pending && > + events->exception.serror_has_esr) > + events->exception.serror_esr = vcpu_get_vsesr(vcpu); > + else > + events->exception.serror_esr = 0; > + > + return 0; > +} > + > +int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu, > + struct kvm_vcpu_events *events) > +{ > + bool serror_pending = events->exception.serror_pending; > + bool has_esr = events->exception.serror_has_esr; > + > + if (serror_pending && has_esr) { > + if (!cpus_have_const_cap(ARM64_HAS_RAS_EXTN)) > + return -EINVAL; > + > + kvm_set_sei_esr(vcpu, events->exception.serror_esr); > + > + } else if (serror_pending) { > + 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 d8e7165..9e0ca56 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_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 a4c1b76..8b43968 100644 > --- a/virt/kvm/arm/arm.c > +++ b/virt/kvm/arm/arm.c > @@ -1107,6 +1107,27 @@ long kvm_arch_vcpu_ioctl(struct file *filp, > r = kvm_arm_vcpu_has_attr(vcpu, &attr); > break; > } > + case KVM_GET_VCPU_EVENTS: { > + struct kvm_vcpu_events events; > + > + memset(&events, 0, sizeof(events)); > + if (kvm_arm_vcpu_get_events(vcpu, &events)) > + return -EINVAL; > + > + if (copy_to_user(argp, &events, sizeof(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: > r = -EINVAL; > } > -- > 2.7.4 >
On 2018/6/2 5:22, Eric Northup wrote: > On Wed, May 30, 2018 at 10:04 PM Dongjiu Geng <gengdongjiu@huawei.com> wrote: >> >> For the migrating VMs, user space may need to know the exception [...] >> + __u8 pad[6]; >> + __u64 serror_esr; >> + } exception; >> + __u32 reserved[12]; > > It will be easier to re-purpose this in the future if the field is > reserved and is checked that it must be zero. SET_VCPU_EVENTS would > return EINVAL if reserved fields get used until a later meaning is > defined for them. Ok, thanks. I will check the reserved fields when calling SET_VCPU_EVENTS. > >> +}; >> + >> /* 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 56a0260..71d3841 100644 >> --- a/arch/arm64/kvm/guest.c >> +++ b/arch/arm64/kvm/guest.c >> @@ -289,6 +289,42 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, >> return -EINVAL; >> } >> [...] >> -- >> 2.7.4 >> > > . >
Hi Dongjiu,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on arm64/for-next/core]
[also build test WARNING on v4.17 next-20180601]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Dongjiu-Geng/arm64-KVM-export-the-capability-to-set-guest-SError-syndrome/20180602-175846
base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
config: arm-axm55xx_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=arm
All warnings (new ones prefixed by >>):
In file included from include/linux/kvm_host.h:37:0,
from arch/arm/kernel/asm-offsets.c:18:
>> arch/arm/include/asm/kvm_host.h:217:11: warning: 'struct kvm_vcpu_events' declared inside parameter list will not be visible outside of this definition or declaration
struct kvm_vcpu_events *events);
^~~~~~~~~~~~~~~
arch/arm/include/asm/kvm_host.h:220:11: warning: 'struct kvm_vcpu_events' declared inside parameter list will not be visible outside of this definition or declaration
struct kvm_vcpu_events *events);
^~~~~~~~~~~~~~~
vim +217 arch/arm/include/asm/kvm_host.h
210
211 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
212 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
213 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
214 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
215 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
216 int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
> 217 struct kvm_vcpu_events *events);
218
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
Hi Dongjiu,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on arm64/for-next/core]
[also build test ERROR on v4.17 next-20180601]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Dongjiu-Geng/arm64-KVM-export-the-capability-to-set-guest-SError-syndrome/20180602-175846
base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
config: arm-axm55xx_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=arm
All error/warnings (new ones prefixed by >>):
In file included from include/linux/kvm_host.h:37:0,
from arch/arm/kvm/guest.c:21:
arch/arm/include/asm/kvm_host.h:217:11: warning: 'struct kvm_vcpu_events' declared inside parameter list will not be visible outside of this definition or declaration
struct kvm_vcpu_events *events);
^~~~~~~~~~~~~~~
arch/arm/include/asm/kvm_host.h:220:11: warning: 'struct kvm_vcpu_events' declared inside parameter list will not be visible outside of this definition or declaration
struct kvm_vcpu_events *events);
^~~~~~~~~~~~~~~
>> arch/arm/kvm/guest.c:265:11: warning: 'struct kvm_vcpu_events' declared inside parameter list will not be visible outside of this definition or declaration
struct kvm_vcpu_events *events)
^~~~~~~~~~~~~~~
>> arch/arm/kvm/guest.c:264:5: error: conflicting types for 'kvm_arm_vcpu_get_events'
int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
^~~~~~~~~~~~~~~~~~~~~~~
In file included from include/linux/kvm_host.h:37:0,
from arch/arm/kvm/guest.c:21:
arch/arm/include/asm/kvm_host.h:216:5: note: previous declaration of 'kvm_arm_vcpu_get_events' was here
int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
^~~~~~~~~~~~~~~~~~~~~~~
arch/arm/kvm/guest.c:271:11: warning: 'struct kvm_vcpu_events' declared inside parameter list will not be visible outside of this definition or declaration
struct kvm_vcpu_events *events)
^~~~~~~~~~~~~~~
>> arch/arm/kvm/guest.c:270:5: error: conflicting types for 'kvm_arm_vcpu_set_events'
int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
^~~~~~~~~~~~~~~~~~~~~~~
In file included from include/linux/kvm_host.h:37:0,
from arch/arm/kvm/guest.c:21:
arch/arm/include/asm/kvm_host.h:219:5: note: previous declaration of 'kvm_arm_vcpu_set_events' was here
int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
^~~~~~~~~~~~~~~~~~~~~~~
--
In file included from include/linux/kvm_host.h:37:0,
from arch/arm/kvm/../../../virt/kvm/arm/arm.c:22:
arch/arm/include/asm/kvm_host.h:217:11: warning: 'struct kvm_vcpu_events' declared inside parameter list will not be visible outside of this definition or declaration
struct kvm_vcpu_events *events);
^~~~~~~~~~~~~~~
arch/arm/include/asm/kvm_host.h:220:11: warning: 'struct kvm_vcpu_events' declared inside parameter list will not be visible outside of this definition or declaration
struct kvm_vcpu_events *events);
^~~~~~~~~~~~~~~
In file included from include/asm-generic/ioctl.h:5:0,
from ./arch/arm/include/generated/uapi/asm/ioctl.h:1,
from include/uapi/linux/ioctl.h:5,
from include/uapi/linux/fs.h:14,
from include/linux/fs.h:41,
from include/linux/huge_mm.h:7,
from include/linux/mm.h:472,
from include/linux/kvm_host.h:17,
from arch/arm/kvm/../../../virt/kvm/arm/arm.c:22:
arch/arm/kvm/../../../virt/kvm/arm/arm.c: In function 'kvm_arch_vcpu_ioctl':
>> include/uapi/linux/kvm.h:1339:54: error: invalid application of 'sizeof' to incomplete type 'struct kvm_vcpu_events'
#define KVM_GET_VCPU_EVENTS _IOR(KVMIO, 0x9f, struct kvm_vcpu_events)
^
include/uapi/asm-generic/ioctl.h:73:5: note: in definition of macro '_IOC'
((size) << _IOC_SIZESHIFT))
^~~~
>> include/uapi/asm-generic/ioctl.h:86:56: note: in expansion of macro '_IOC_TYPECHECK'
#define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
^~~~~~~~~~~~~~
>> include/uapi/linux/kvm.h:1339:35: note: in expansion of macro '_IOR'
#define KVM_GET_VCPU_EVENTS _IOR(KVMIO, 0x9f, struct kvm_vcpu_events)
^~~~
>> arch/arm/kvm/../../../virt/kvm/arm/arm.c:1110:7: note: in expansion of macro 'KVM_GET_VCPU_EVENTS'
case KVM_GET_VCPU_EVENTS: {
^~~~~~~~~~~~~~~~~~~
>> include/asm-generic/ioctl.h:13:25: error: array type has incomplete element type 'struct kvm_vcpu_events'
((sizeof(t) == sizeof(t[1]) && \
^
include/uapi/asm-generic/ioctl.h:73:5: note: in definition of macro '_IOC'
((size) << _IOC_SIZESHIFT))
^~~~
>> include/uapi/asm-generic/ioctl.h:86:56: note: in expansion of macro '_IOC_TYPECHECK'
#define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
^~~~~~~~~~~~~~
>> include/uapi/linux/kvm.h:1339:35: note: in expansion of macro '_IOR'
#define KVM_GET_VCPU_EVENTS _IOR(KVMIO, 0x9f, struct kvm_vcpu_events)
^~~~
>> arch/arm/kvm/../../../virt/kvm/arm/arm.c:1110:7: note: in expansion of macro 'KVM_GET_VCPU_EVENTS'
case KVM_GET_VCPU_EVENTS: {
^~~~~~~~~~~~~~~~~~~
>> include/uapi/linux/kvm.h:1339:54: error: invalid application of 'sizeof' to incomplete type 'struct kvm_vcpu_events'
#define KVM_GET_VCPU_EVENTS _IOR(KVMIO, 0x9f, struct kvm_vcpu_events)
^
include/uapi/asm-generic/ioctl.h:73:5: note: in definition of macro '_IOC'
((size) << _IOC_SIZESHIFT))
^~~~
>> include/uapi/asm-generic/ioctl.h:86:56: note: in expansion of macro '_IOC_TYPECHECK'
#define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
^~~~~~~~~~~~~~
>> include/uapi/linux/kvm.h:1339:35: note: in expansion of macro '_IOR'
#define KVM_GET_VCPU_EVENTS _IOR(KVMIO, 0x9f, struct kvm_vcpu_events)
^~~~
>> arch/arm/kvm/../../../virt/kvm/arm/arm.c:1110:7: note: in expansion of macro 'KVM_GET_VCPU_EVENTS'
case KVM_GET_VCPU_EVENTS: {
^~~~~~~~~~~~~~~~~~~
>> include/uapi/linux/kvm.h:1339:54: error: invalid application of 'sizeof' to incomplete type 'struct kvm_vcpu_events'
#define KVM_GET_VCPU_EVENTS _IOR(KVMIO, 0x9f, struct kvm_vcpu_events)
^
include/uapi/asm-generic/ioctl.h:73:5: note: in definition of macro '_IOC'
((size) << _IOC_SIZESHIFT))
^~~~
>> include/uapi/asm-generic/ioctl.h:86:56: note: in expansion of macro '_IOC_TYPECHECK'
#define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
^~~~~~~~~~~~~~
>> include/uapi/linux/kvm.h:1339:35: note: in expansion of macro '_IOR'
#define KVM_GET_VCPU_EVENTS _IOR(KVMIO, 0x9f, struct kvm_vcpu_events)
^~~~
>> arch/arm/kvm/../../../virt/kvm/arm/arm.c:1110:7: note: in expansion of macro 'KVM_GET_VCPU_EVENTS'
case KVM_GET_VCPU_EVENTS: {
^~~~~~~~~~~~~~~~~~~
>> arch/arm/kvm/../../../virt/kvm/arm/arm.c:1111:26: error: storage size of 'events' isn't known
struct kvm_vcpu_events events;
^~~~~~
arch/arm/kvm/../../../virt/kvm/arm/arm.c:1111:26: warning: unused variable 'events' [-Wunused-variable]
In file included from include/asm-generic/ioctl.h:5:0,
from ./arch/arm/include/generated/uapi/asm/ioctl.h:1,
from include/uapi/linux/ioctl.h:5,
from include/uapi/linux/fs.h:14,
from include/linux/fs.h:41,
from include/linux/huge_mm.h:7,
from include/linux/mm.h:472,
from include/linux/kvm_host.h:17,
from arch/arm/kvm/../../../virt/kvm/arm/arm.c:22:
include/uapi/linux/kvm.h:1340:54: error: invalid application of 'sizeof' to incomplete type 'struct kvm_vcpu_events'
#define KVM_SET_VCPU_EVENTS _IOW(KVMIO, 0xa0, struct kvm_vcpu_events)
^
include/uapi/asm-generic/ioctl.h:73:5: note: in definition of macro '_IOC'
((size) << _IOC_SIZESHIFT))
^~~~
include/uapi/asm-generic/ioctl.h:87:57: note: in expansion of macro '_IOC_TYPECHECK'
#define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
^~~~~~~~~~~~~~
>> include/uapi/linux/kvm.h:1340:35: note: in expansion of macro '_IOW'
#define KVM_SET_VCPU_EVENTS _IOW(KVMIO, 0xa0, struct kvm_vcpu_events)
^~~~
>> arch/arm/kvm/../../../virt/kvm/arm/arm.c:1122:7: note: in expansion of macro 'KVM_SET_VCPU_EVENTS'
case KVM_SET_VCPU_EVENTS: {
^~~~~~~~~~~~~~~~~~~
>> include/asm-generic/ioctl.h:13:25: error: array type has incomplete element type 'struct kvm_vcpu_events'
((sizeof(t) == sizeof(t[1]) && \
^
include/uapi/asm-generic/ioctl.h:73:5: note: in definition of macro '_IOC'
((size) << _IOC_SIZESHIFT))
^~~~
include/uapi/asm-generic/ioctl.h:87:57: note: in expansion of macro '_IOC_TYPECHECK'
#define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
^~~~~~~~~~~~~~
vim +/kvm_arm_vcpu_get_events +264 arch/arm/kvm/guest.c
263
> 264 int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
> 265 struct kvm_vcpu_events *events)
266 {
267 return -EINVAL;
268 }
269
> 270 int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
271 struct kvm_vcpu_events *events)
272 {
273 return -EINVAL;
274 }
275
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index fdac969..8896737 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -835,11 +835,13 @@ 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. @@ -881,15 +883,32 @@ 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 8 bytes */ + __u8 pad[6]; + __u64 serror_esr; + } exception; + __u32 reserved[12]; +}; + 4.32 KVM_SET_VCPU_EVENTS -Capability: KVM_CAP_VCPU_EVENTS +Capebility: 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. @@ -910,6 +929,12 @@ 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 c7c28c8..39f9901 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -213,6 +213,12 @@ unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu); 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 a18f33e..c685f0e 100644 --- a/arch/arm/kvm/guest.c +++ b/arch/arm/kvm/guest.c @@ -261,6 +261,18 @@ 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 1dab3a9..18f61ff 100644 --- a/arch/arm64/include/asm/kvm_emulate.h +++ b/arch/arm64/include/asm/kvm_emulate.h @@ -81,6 +81,11 @@ static inline unsigned long *vcpu_hcr(struct kvm_vcpu *vcpu) return (unsigned long *)&vcpu->arch.hcr_el2; } +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 469de8a..357304a 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -335,6 +335,11 @@ unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu); 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); @@ -363,6 +368,8 @@ 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); void __kvm_set_tpidr_el2(u64 tpidr_el2); diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index 04b3256..df4faee 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 +154,18 @@ 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 8 bytes */ + __u8 pad[6]; + __u64 serror_esr; + } exception; + __u32 reserved[12]; +}; + /* 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 56a0260..71d3841 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -289,6 +289,42 @@ 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->arch.hcr_el2 & HCR_VSE); + events->exception.serror_has_esr = + cpus_have_const_cap(ARM64_HAS_RAS_EXTN) && + (!!vcpu_get_vsesr(vcpu)); + + if (events->exception.serror_pending && + events->exception.serror_has_esr) + events->exception.serror_esr = vcpu_get_vsesr(vcpu); + else + events->exception.serror_esr = 0; + + return 0; +} + +int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu, + struct kvm_vcpu_events *events) +{ + bool serror_pending = events->exception.serror_pending; + bool has_esr = events->exception.serror_has_esr; + + if (serror_pending && has_esr) { + if (!cpus_have_const_cap(ARM64_HAS_RAS_EXTN)) + return -EINVAL; + + kvm_set_sei_esr(vcpu, events->exception.serror_esr); + + } else if (serror_pending) { + 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 d8e7165..9e0ca56 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_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 a4c1b76..8b43968 100644 --- a/virt/kvm/arm/arm.c +++ b/virt/kvm/arm/arm.c @@ -1107,6 +1107,27 @@ long kvm_arch_vcpu_ioctl(struct file *filp, r = kvm_arm_vcpu_has_attr(vcpu, &attr); break; } + case KVM_GET_VCPU_EVENTS: { + struct kvm_vcpu_events events; + + memset(&events, 0, sizeof(events)); + if (kvm_arm_vcpu_get_events(vcpu, &events)) + return -EINVAL; + + if (copy_to_user(argp, &events, sizeof(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: r = -EINVAL; }
For the migrating VMs, user space may need to know the exception state. For example, in the machine A, KVM make an SError pending, when migrate to B, KVM also needs to pend an SError. This new IOCTL exports user-invisible states related to SError. Together with appropriate user space changes, user space can get/set the SError exception state to do migrate/snapshot/suspend. Signed-off-by: Dongjiu Geng <gengdongjiu@huawei.com> -- this series patch is separated from https://www.spinics.net/lists/kvm/msg168917.html change since V12: 1. change (vcpu->arch.hcr_el2 & HCR_VSE) to !!(vcpu->arch.hcr_el2 & HCR_VSE) in kvm_arm_vcpu_get_events() Change since V11: Address James's comments, thanks James 1. Align the struct of kvm_vcpu_events to 64 bytes 2. Avoid exposing the stale ESR value in the kvm_arm_vcpu_get_events() 3. Change variables 'injected' name to 'serror_pending' in the kvm_arm_vcpu_set_events() 4. Change to sizeof(events) from sizeof(struct kvm_vcpu_events) in kvm_arch_vcpu_ioctl() 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 | 31 ++++++++++++++++++++++++++++--- 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 | 13 +++++++++++++ arch/arm64/kvm/guest.c | 36 ++++++++++++++++++++++++++++++++++++ arch/arm64/kvm/inject_fault.c | 7 ++++++- arch/arm64/kvm/reset.c | 1 + virt/kvm/arm/arm.c | 21 +++++++++++++++++++++ 10 files changed, 135 insertions(+), 4 deletions(-)