On 9/18/2020 3:55 PM, Andrew Jones wrote:
> 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 <zhang.zhanghailiang@xxxxxxxxxx>
>> Signed-off-by: Peng Liang <liangpeng10@xxxxxxxxxx>
>> ---
>> 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
>
> .
>
Thank you for your advise. I'll change them in next version.
Thanks,
Peng
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