[PATCH 59/89] KVM: arm64: Do not support MTE for protected VMs

[Peter Collingbourne]

On Thu, May 19, 2022 at 7:40 AM Will Deacon <will at kernel.org> wrote:
>
> From: Fuad Tabba <tabba at google.com>
>
> Return an error (-EINVAL) if trying to enable MTE on a protected
> vm.
>
> Signed-off-by: Fuad Tabba <tabba at google.com>
> ---
>  arch/arm64/kvm/arm.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
> index 10e036bf06e3..8a1b4ba1dfa7 100644
> --- a/arch/arm64/kvm/arm.c
> +++ b/arch/arm64/kvm/arm.c
> @@ -90,7 +90,9 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
>                 break;
>         case KVM_CAP_ARM_MTE:
>                 mutex_lock(&kvm->lock);
> -               if (!system_supports_mte() || kvm->created_vcpus) {
> +               if (!system_supports_mte() ||
> +                   kvm_vm_is_protected(kvm) ||

Should this check be added to kvm_vm_ioctl_check_extension() as well?

Peter