[PATCH v6 07/30] KVM: selftests: TDX: Use KVM_TDX_CAPABILITIES to validate TDs' attribute configuration

[Sagi Shahar]

From: Ackerley Tng <ackerleytng@xxxxxxxxxx>

This also exercises the KVM_TDX_CAPABILITIES ioctl.

Suggested-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
Co-developed-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
Signed-off-by: Ackerley Tng <ackerleytng@xxxxxxxxxx>
Signed-off-by: Sagi Shahar <sagis@xxxxxxxxxx>
---
 .../selftests/kvm/lib/x86/tdx/tdx_util.c        | 17 +++++++++++++++++
 1 file changed, 17 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 392d6272d17e..bb074af4a476 100644
--- a/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c
+++ b/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c
@@ -140,6 +140,21 @@ static void tdx_apply_cpuid_restrictions(struct kvm_cpuid2 *cpuid_data)
 	}
 }
 
+static void tdx_check_attributes(struct kvm_vm *vm, uint64_t attributes)
+{
+	struct kvm_tdx_capabilities *tdx_cap;
+
+	tdx_cap = tdx_read_capabilities(vm);
+
+	/* TDX spec: any bits 0 in supported_attrs must be 0 in attributes */
+	TEST_ASSERT_EQ(attributes & ~tdx_cap->supported_attrs, 0);
+
+	/* TDX spec: any bits 1 in attributes must be 1 in supported_attrs */
+	TEST_ASSERT_EQ(attributes & tdx_cap->supported_attrs, attributes);
+
+	free(tdx_cap);
+}
+
 #define KVM_MAX_CPUID_ENTRIES 256
 
 #define CPUID_EXT_VMX			BIT(5)
@@ -256,6 +271,8 @@ static void tdx_td_init(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;
 
 	tdx_apply_cpuid_restrictions(&init_vm->cpuid);
-- 
2.49.0.504.g3bcea36a83-goog