KVM: selftests: Use kvm_cpu_has() for nested SVM checks

Use kvm_cpu_has() to check for nested SVM support, and drop the helpers
now that their functionality is trivial to implement.

No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220614200707.3315957-6-seanjc@google.com

tools/testing/selftests/kvm/include/x86_64/svm_util.h

@@ -51,8 +51,6 @@ struct svm_test_data {
 struct svm_test_data *vcpu_alloc_svm(struct kvm_vm *vm, vm_vaddr_t *p_svm_gva);
 void generic_svm_setup(struct svm_test_data *svm, void *guest_rip, void *guest_rsp);
 void run_guest(struct vmcb *vmcb, uint64_t vmcb_gpa);
-bool nested_svm_supported(void);
-void nested_svm_check_supported(void);
 
 static inline bool cpu_has_svm(void)
 {

tools/testing/selftests/kvm/lib/x86_64/svm.c

@@ -164,19 +164,6 @@ void run_guest(struct vmcb *vmcb, uint64_t vmcb_gpa)
 		: "r15", "memory");
 }
 
-bool nested_svm_supported(void)
-{
-	struct kvm_cpuid_entry2 *entry =
-		kvm_get_supported_cpuid_entry(0x80000001);
-
-	return entry->ecx & CPUID_SVM;
-}
-
-void nested_svm_check_supported(void)
-{
-	TEST_REQUIRE(nested_svm_supported());
-}
-
 /*
  * Open SEV_DEV_PATH if available, otherwise exit the entire program.
  *

tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c

@@ -127,7 +127,7 @@ int main(int argc, char *argv[])
 	struct ucall uc;
 	int stage;
 
-	TEST_REQUIRE(nested_svm_supported());
+	TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
 
 	/* Create VM */
 	vm = vm_create_with_one_vcpu(&vcpu, guest_code);

tools/testing/selftests/kvm/x86_64/smm_test.c

@@ -154,7 +154,7 @@ int main(int argc, char *argv[])
 	vcpu_set_msr(vcpu, MSR_IA32_SMBASE, SMRAM_GPA);
 
 	if (kvm_has_cap(KVM_CAP_NESTED_STATE)) {
-		if (nested_svm_supported())
+		if (kvm_cpu_has(X86_FEATURE_SVM))
 			vcpu_alloc_svm(vm, &nested_gva);
 		else if (nested_vmx_supported())
 			vcpu_alloc_vmx(vm, &nested_gva);

tools/testing/selftests/kvm/x86_64/state_test.c

@@ -170,7 +170,7 @@ int main(int argc, char *argv[])
 	vcpu_regs_get(vcpu, &regs1);
 
 	if (kvm_has_cap(KVM_CAP_NESTED_STATE)) {
-		if (nested_svm_supported())
+		if (kvm_cpu_has(X86_FEATURE_SVM))
 			vcpu_alloc_svm(vm, &nested_gva);
 		else if (nested_vmx_supported())
 			vcpu_alloc_vmx(vm, &nested_gva);

tools/testing/selftests/kvm/x86_64/svm_int_ctl_test.c

@@ -90,7 +90,7 @@ int main(int argc, char *argv[])
 	struct kvm_vm *vm;
 	struct ucall uc;
 
-	nested_svm_check_supported();
+	TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
 
 	vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
 

tools/testing/selftests/kvm/x86_64/svm_nested_soft_inject_test.c

@@ -199,7 +199,7 @@ int main(int argc, char *argv[])
 	/* Tell stdout not to buffer its content */
 	setbuf(stdout, NULL);
 
-	nested_svm_check_supported();
+	TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
 
 	cpuid = kvm_get_supported_cpuid_entry(0x8000000a);
 	TEST_ASSERT(cpuid->edx & CPUID_NRIPS,

tools/testing/selftests/kvm/x86_64/svm_vmcall_test.c

@@ -39,7 +39,7 @@ int main(int argc, char *argv[])
 	vm_vaddr_t svm_gva;
 	struct kvm_vm *vm;
 
-	nested_svm_check_supported();
+	TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
 
 	vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);