linux-kernel - [PATCH 26/44] x86: cpu_emergency_svm

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Date:	Tue,  9 Dec 2008 22:22:41 +0200
From:	Avi Kivity <avi@...hat.com>
To:	kvm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Eduardo Habkost <ehabkost@...hat.com>
Subject: [PATCH 26/44] x86: cpu_emergency_svm_disable() function

From: Eduardo Habkost <ehabkost@...hat.com>

This function can be used by the reboot or kdump code to forcibly
disable SVM on the CPU.

Signed-off-by: Eduardo Habkost <ehabkost@...hat.com>
Signed-off-by: Avi Kivity <avi@...hat.com>
---
 arch/x86/include/asm/virtext.h |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h
index 2cfe363..5936362 100644
--- a/arch/x86/include/asm/virtext.h
+++ b/arch/x86/include/asm/virtext.h
@@ -121,4 +121,12 @@ static inline void cpu_svm_disable(void)
 	wrmsrl(MSR_EFER, efer & ~MSR_EFER_SVME_MASK);
 }
 
+/** Makes sure SVM is disabled, if it is supported on the CPU
+ */
+static inline void cpu_emergency_svm_disable(void)
+{
+	if (cpu_has_svm(NULL))
+		cpu_svm_disable();
+}
+
 #endif /* _ASM_X86_VIRTEX_H */
-- 
1.6.0.3

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