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

Sagi Shahar
2025-10-28T21:21:08Z

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.

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);
--
2.51.1.851.g4ebd6896fd-goog