linux-kernel - [PATCH 27/30] selftests: kvm: introduce cpu_has

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Message-Id: <20200529153934.11694-28-pbonzini@redhat.com>
Date:   Fri, 29 May 2020 11:39:31 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: [PATCH 27/30] selftests: kvm: introduce cpu_has_svm() check

From: Vitaly Kuznetsov <vkuznets@...hat.com>

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@...hat.com>
Message-Id: <20200529130407.57176-1-vkuznets@...hat.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 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