On Thu, Sep 17, 2020 at 08:01:01PM +0800, Peng Liang wrote:
> 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
> +-----------------------------------
Too many '----'
> +
> +:Architecture: arm64
> +
> +This capability indicates that userspace can modify the ID registers via
> +KVM_SET_ONE_REG ioctl.
You should say something like "See KVM_SET_ONE_REG:ARM64 ID Registers"
here and also extend the "KVM_SET_ONE_REG" section with a "ARM64 ID
Register" section that describes the limits and return values.
> 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
>
Thanks,
drew
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