[PATCH v9 13/19] KVM: selftests: TDX: Use KVM_TDX_CAPABILITIES to validate TDs' attribute configuration

[Sagi Shahar]

From: Isaku Yamahata <isaku.yamah...@intel.com>

This also exercises the KVM_TDX_CAPABILITIES ioctl.

Signed-off-by: Isaku Yamahata <isaku.yamah...@intel.com>
Co-developed-by: Sagi Shahar <sa...@google.com>
Signed-off-by: Sagi Shahar <sa...@google.com>
---
 .../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 3869756a5641..d8eab99d9333 100644
--- a/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c
+++ b/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c
@@ -232,6 +232,21 @@ 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);
+
+       /* 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);
+}
+
 void vm_tdx_init_vm(struct kvm_vm *vm, uint64_t attributes)
 {
        struct kvm_tdx_init_vm *init_vm;
@@ -251,6 +266,8 @@ 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.rc1.193.gad69d77794-goog