Re: [PATCH v12 13/23] KVM: selftests: TDX: Use KVM_TDX_CAPABILITIES to validate TDs' attribute configuration

Binbin Wu
2025-10-30T01:35:12Z

On 10/29/2025 5:20 AM, Sagi Shahar wrote:
> From: Isaku Yamahata <isaku.yamahata@intel.com>
>
> Make sure that all the attributes enabled by the test are reported as
> supported by the TDX module.
More accurately, supported by both the TDX module and KVM.
KVM filters out the attributes not supported by itself.

Otherwise,
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>

>
> This also exercises the KVM_TDX_CAPABILITIES ioctl.
>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
> Co-developed-by: Sagi Shahar <sagis@google.com>
> Signed-off-by: Sagi Shahar <sagis@google.com>
> ---
> tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c b/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c
> index 7a622b4810b1..2551b3eac8f8 100644
> --- a/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c
> +++ b/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c
> @@ -231,6 +231,18 @@ static void vm_tdx_filter_cpuid(struct kvm_vm *vm,
> free(tdx_cap);
> }
>
> +static void tdx_check_attributes(struct kvm_vm *vm, uint64_t attributes)
> +{
> + struct kvm_tdx_capabilities *tdx_cap;
> +
> + tdx_cap = tdx_read_capabilities(vm);
> +
> + /* Make sure all the attributes are reported as supported */
> + TEST_ASSERT_EQ(attributes & tdx_cap->supported_attrs, attributes);
> +
> + free(tdx_cap);
> +}
> +
> void vm_tdx_init_vm(struct kvm_vm *vm, uint64_t attributes)
> {
> struct kvm_tdx_init_vm *init_vm;
> @@ -250,6 +262,8 @@ void vm_tdx_init_vm(struct kvm_vm *vm, uint64_t attributes)
> memcpy(&init_vm->cpuid, cpuid, kvm_cpuid2_size(cpuid->nent));
> free(cpuid);
>
> + tdx_check_attributes(vm, attributes);
> +
> init_vm->attributes = attributes;
>
> vm_tdx_vm_ioctl(vm, KVM_TDX_INIT_VM, 0, init_vm);