linux-kernel - [RFC PATCH 2/3] kvm: Add accessors for guest CPU's family, model, stepping

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Date:	Sat, 14 Nov 2015 11:37:15 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Paolo Bonzini <pbonzini@...hat.com>, X86 ML <x86@...nel.org>,
	KVM <kvm@...r.kernel.org>
Subject: [RFC PATCH 2/3] kvm: Add accessors for guest CPU's family, model, stepping

From: Borislav Petkov <bp@...e.de>

Those give the family, model and stepping of the guest vcpu.

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/cpuid.h | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index 06332cb7e7d1..5d47e0d95ef1 100644
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -2,6 +2,7 @@
 #define ARCH_X86_KVM_CPUID_H
 
 #include "x86.h"
+#include <asm/cpu.h>
 
 int kvm_update_cpuid(struct kvm_vcpu *vcpu);
 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
@@ -170,4 +171,37 @@ static inline bool guest_cpuid_has_nrips(struct kvm_vcpu *vcpu)
 }
 #undef BIT_NRIPS
 
+static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
+{
+	struct kvm_cpuid_entry2 *best;
+
+	best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
+	if (!best)
+		return -1;
+
+	return x86_family(best->eax);
+}
+
+static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
+{
+	struct kvm_cpuid_entry2 *best;
+
+	best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
+	if (!best)
+		return -1;
+
+	return x86_model(best->eax);
+}
+
+static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
+{
+	struct kvm_cpuid_entry2 *best;
+
+	best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
+	if (!best)
+		return -1;
+
+	return x86_stepping(best->eax);
+}
+
 #endif
-- 
2.3.5

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