Re: [PATCH v13 12/22] KVM: selftests: Back the first memory region with guest_memfd for TDX

[Binbin Wu <binbin.wu@linux.intel.com>]

On 5/22/2026 7:16 AM, Lisa Wang wrote:
> Force GUEST_MEMFD for the primary memory region of TDX VMs.
> 
> TDX must use guest_memfd for private pages as there is no alternative
> mechanism supported by the TDX architecture.

This sounds a bit confusing to me.
It's the kernel/KVM only support guest_memfd for private pages.
The restriction is not from the "TDX architecture".

Also, the short log is also a bit confusing.
Why describe the "first memory region" here?

> 
> Signed-off-by: Lisa Wang <wyihan@google.com>
> ---
>  tools/testing/selftests/kvm/lib/kvm_util.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index d1befa3f4b30..9a29540fff40 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -472,7 +472,7 @@ void kvm_set_files_rlimit(u32 nr_vcpus)
>  static bool is_guest_memfd_required(struct vm_shape shape)
>  {
>  #ifdef __x86_64__
> -	return shape.type == KVM_X86_SNP_VM;
> +	return (shape.type == KVM_X86_SNP_VM || shape.type == KVM_X86_TDX_VM);
>  #else
>  	return false;
>  #endif
>