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SubjectRe: [PATCH v7 8/10] KVM: arm64: Add capability to advertise ptrauth for guest
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Hi,

On 3/26/19 1:35 AM, Kristina Martsenko wrote:
> On 19/03/2019 08:30, Amit Daniel Kachhap wrote:
>> This patch advertises the capability of pointer authentication
>> when system supports pointer authentication and VHE mode present.
>>
>> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
>> Cc: Mark Rutland <mark.rutland@arm.com>
>> Cc: Marc Zyngier <marc.zyngier@arm.com>
>> Cc: Christoffer Dall <christoffer.dall@arm.com>
>> Cc: kvmarm@lists.cs.columbia.edu
>> ---
>> arch/arm64/kvm/reset.c | 4 ++++
>> include/uapi/linux/kvm.h | 1 +
>> 2 files changed, 5 insertions(+)
>>
>> diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
>> index 00f0639..a3b269e 100644
>> --- a/arch/arm64/kvm/reset.c
>> +++ b/arch/arm64/kvm/reset.c
>> @@ -92,6 +92,10 @@ int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext)
>> case KVM_CAP_ARM_VM_IPA_SIZE:
>> r = kvm_ipa_limit;
>> break;
>> + case KVM_CAP_ARM_PTRAUTH:
>> + r = has_vhe() && system_supports_address_auth() &&
>> + system_supports_generic_auth();
>> + break;
>> default:
>> r = 0;
>> }
>> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
>> index 6d4ea4b..a553477 100644
>> --- a/include/uapi/linux/kvm.h
>> +++ b/include/uapi/linux/kvm.h
>> @@ -988,6 +988,7 @@ struct kvm_ppc_resize_hpt {
>> #define KVM_CAP_ARM_VM_IPA_SIZE 165
>> #define KVM_CAP_MANUAL_DIRTY_LOG_PROTECT 166
>> #define KVM_CAP_HYPERV_CPUID 167
>> +#define KVM_CAP_ARM_PTRAUTH 168
>
> Since we now have two separate vcpu flags, then I think we also need two
> capabilities here (one for address auth and one for generic auth). This
> will allow us to support the features separately in the future if we
> need to.
I have no objection to your suggestion. Infact all other KVM_ARM_VCPU_*
features have there own capability defined. I will check other
architectures if they define separate capability for major/minor features.

Thanks,
Amit D
>
> Thanks,
> Kristina
>

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