linux-kernel - [PATCH v10 12/21] KVM: selftests: TDX: Use KVM_TDX_CAPABILITIES to validate TDs' attribute configuration

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Message-ID: <20250904065453.639610-13-sagis@google.com>
Date: Wed,  3 Sep 2025 23:54:42 -0700
From: Sagi Shahar <sagis@...gle.com>
To: linux-kselftest@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>, 
	Shuah Khan <shuah@...nel.org>, Sean Christopherson <seanjc@...gle.com>, 
	Ackerley Tng <ackerleytng@...gle.com>, Ryan Afranji <afranji@...gle.com>, 
	Andrew Jones <ajones@...tanamicro.com>, Isaku Yamahata <isaku.yamahata@...el.com>, 
	Erdem Aktas <erdemaktas@...gle.com>, Rick Edgecombe <rick.p.edgecombe@...el.com>, 
	Sagi Shahar <sagis@...gle.com>, Roger Wang <runanwang@...gle.com>, 
	Binbin Wu <binbin.wu@...ux.intel.com>, Oliver Upton <oliver.upton@...ux.dev>, 
	"Pratik R. Sampat" <pratikrajesh.sampat@....com>, Reinette Chatre <reinette.chatre@...el.com>, 
	Ira Weiny <ira.weiny@...el.com>, Chao Gao <chao.gao@...el.com>, 
	Chenyi Qiang <chenyi.qiang@...el.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH v10 12/21] KVM: selftests: TDX: Use KVM_TDX_CAPABILITIES to
 validate TDs' attribute configuration

From: Isaku Yamahata <isaku.yamahata@...el.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@...el.com>
Co-developed-by: Sagi Shahar <sagis@...gle.com>
Signed-off-by: Sagi Shahar <sagis@...gle.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 aa0cb6c2205b..1b5c01faf1cd 100644
--- a/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c
+++ b/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c
@@ -234,6 +234,18 @@ 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 by the TDX module */
+	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;
@@ -253,6 +265,8 @@ 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);
-- 
2.51.0.338.gd7d06c2dae-goog