Add KVM_CAP_ARM_CPU_FEATURE extension for userpace to check whether KVM supports to set CPU features in AArch64.
Signed-off-by: zhanghailiang <[email protected]> Signed-off-by: Peng Liang <[email protected]> --- Documentation/virt/kvm/api.rst | 8 ++++++++ arch/arm64/kvm/arm.c | 1 + include/uapi/linux/kvm.h | 1 + 3 files changed, 10 insertions(+) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index d2b733dc7892..50214ed8f50e 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -6173,3 +6173,11 @@ specific interfaces must be consistent, i.e. if one says the feature is supported, than the other should as well and vice versa. For arm64 see Documentation/virt/kvm/devices/vcpu.rst "KVM_ARM_VCPU_PVTIME_CTRL". For x86 see Documentation/virt/kvm/msr.rst "MSR_KVM_STEAL_TIME". + +8.25 KVM_CAP_ARM_CPU_FEATURE +----------------------------------- + +:Architecture: arm64 + +This capability indicates that userspace can modify the ID registers via +KVM_SET_ONE_REG ioctl. diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 6d961e192268..918a7a56b224 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -178,6 +178,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2: case KVM_CAP_ARM_NISV_TO_USER: case KVM_CAP_ARM_INJECT_EXT_DABT: + case KVM_CAP_ARM_CPU_FEATURE: r = 1; break; case KVM_CAP_ARM_SET_DEVICE_ADDR: diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 7d8eced6f459..12356beadd5a 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1037,6 +1037,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_SMALLER_MAXPHYADDR 185 #define KVM_CAP_S390_DIAG318 186 #define KVM_CAP_STEAL_TIME 187 +#define KVM_CAP_ARM_CPU_FEATURE 188 #ifdef KVM_CAP_IRQ_ROUTING -- 2.26.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
