[PATCH 27/30] selftests: kvm: introduce cpu_has_svm() check

[Paolo Bonzini]

From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>

Many tests will want to check if the CPU is Intel or AMD in
guest code, add cpu_has_svm() and put it as static
inline to svm_util.h.

Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Message-Id: <20200529130407.57176-1-vkuznets@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
 tools/testing/selftests/kvm/include/x86_64/svm_util.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/x86_64/svm_util.h b/tools/testing/selftests/kvm/include/x86_64/svm_util.h
index cd037917fece..b1057773206a 100644
--- a/tools/testing/selftests/kvm/include/x86_64/svm_util.h
+++ b/tools/testing/selftests/kvm/include/x86_64/svm_util.h
@@ -35,4 +35,14 @@ void generic_svm_setup(struct svm_test_data *svm, void *guest_rip, void *guest_r
 void run_guest(struct vmcb *vmcb, uint64_t vmcb_gpa);
 void nested_svm_check_supported(void);
 
+static inline bool cpu_has_svm(void)
+{
+	u32 eax = 0x80000001, ecx;
+
+	asm("cpuid" :
+	    "=a" (eax), "=c" (ecx) : "0" (eax) : "ebx", "edx");
+
+	return ecx & CPUID_SVM;
+}
+
 #endif /* SELFTEST_KVM_SVM_UTILS_H */
-- 
2.26.2