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    Subject[PATCH v7 8/10] KVM: arm64: Add capability to advertise ptrauth for guest
    Date
    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

    #ifdef KVM_CAP_IRQ_ROUTING

    --
    2.7.4
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