Hi Dongjiu Geng, On 03/03/18 16:09, Dongjiu Geng wrote: > Before user space injects a SError, it needs to know whether it can > specify the guest Exception Syndrome, so KVM should tell user space > whether it has such capability. > diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt > index fc3ae95..8a3d708 100644 > --- a/Documentation/virtual/kvm/api.txt > +++ b/Documentation/virtual/kvm/api.txt > @@ -4415,3 +4415,14 @@ Parameters: none > This capability indicates if the flic device will be able to get/set the > AIS states for migration via the KVM_DEV_FLIC_AISM_ALL attribute and allows > to discover this without having to create a flic device. > + > +8.14 KVM_CAP_ARM_SET_SERROR_ESR > + > +Architectures: arm, arm64 > + > +This capability indicates that userspace can specify syndrome value reported to > +guest OS when guest takes a virtual SError interrupt exception. "when userspace triggers a virtual SError"... how? > +If KVM has this capability, userspace can only specify the ISS field for the ESR > +syndrome, can not specify the EC field which is not under control by KVM. Where do I put the ESR? If you re-order this after the patch that adds the API, you can describe how this can be used. Thanks, James > +If this virtual SError is taken to EL1 using AArch64, this value will be reported > +into ISS filed of ESR_EL1. > diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c > index 3256b92..38c8a64 100644 > --- a/arch/arm64/kvm/reset.c > +++ b/arch/arm64/kvm/reset.c > @@ -77,6 +77,9 @@ int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext) > case KVM_CAP_ARM_PMU_V3: > r = kvm_arm_support_pmu_v3(); > break; > + case KVM_CAP_ARM_INJECT_SERROR_ESR: > + r = cpus_have_const_cap(ARM64_HAS_RAS_EXTN); > + break; > case KVM_CAP_SET_GUEST_DEBUG: > case KVM_CAP_VCPU_ATTRIBUTES: > r = 1; > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h > index 8fb90a0..3587b33 100644 > --- a/include/uapi/linux/kvm.h > +++ b/include/uapi/linux/kvm.h > @@ -934,6 +934,7 @@ struct kvm_ppc_resize_hpt { > #define KVM_CAP_S390_AIS_MIGRATION 150 > #define KVM_CAP_PPC_GET_CPU_CHAR 151 > #define KVM_CAP_S390_BPB 152 > +#define KVM_CAP_ARM_INJECT_SERROR_ESR 153 > > #ifdef KVM_CAP_IRQ_ROUTING > > -- 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