linux-kernel - [PATCH 3/4] kvm: switch to use hypervisor_cpuid

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Date:	Tue, 23 Jul 2013 17:41:04 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, gleb@...hat.com, pbonzini@...hat.com,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Jason Wang <jasowang@...hat.com>
Subject: [PATCH 3/4] kvm: switch to use hypervisor_cpuid_base()

Switch to use hypervisor_cpuid_base() to detect KVM.

Cc: Gleb Natapov <gleb@...hat.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Cc: kvm@...r.kernel.org
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 arch/x86/include/asm/kvm_para.h |   17 ++---------------
 1 files changed, 2 insertions(+), 15 deletions(-)

diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h
index 695399f..79bd075 100644
--- a/arch/x86/include/asm/kvm_para.h
+++ b/arch/x86/include/asm/kvm_para.h
@@ -2,6 +2,7 @@
 #define _ASM_X86_KVM_PARA_H
 
 #include <asm/processor.h>
+#include <asm/hypervisor.h>
 #include <uapi/asm/kvm_para.h>
 
 extern void kvmclock_init(void);
@@ -87,24 +88,10 @@ static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
 
 static inline bool kvm_para_available(void)
 {
-	unsigned int eax, ebx, ecx, edx;
-	char signature[13];
-
 	if (boot_cpu_data.cpuid_level < 0)
 		return false;	/* So we don't blow up on old processors */
 
-	if (cpu_has_hypervisor) {
-		cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
-		memcpy(signature + 0, &ebx, 4);
-		memcpy(signature + 4, &ecx, 4);
-		memcpy(signature + 8, &edx, 4);
-		signature[12] = 0;
-
-		if (strcmp(signature, "KVMKVMKVM") == 0)
-			return true;
-	}
-
-	return false;
+        return hypervisor_cpuid_base("KVMKVMKVM", 0);
 }
 
 static inline unsigned int kvm_arch_para_features(void)
-- 
1.7.1

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