linux-kernel - [PATCH 10/12] x86: cpu_emergency_svm

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Message-Id: <1226955804-16802-11-git-send-email-ehabkost@redhat.com>
Date:	Mon, 17 Nov 2008 19:03:22 -0200
From:	Eduardo Habkost <ehabkost@...hat.com>
To:	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Simon Horman <horms@...ge.net.au>,
	Andrew Morton <akpm@...l.org>, Vivek Goyal <vgoyal@...hat.com>,
	Haren Myneni <hbabu@...ibm.com>,
	Andrey Borzenkov <arvidjaar@...l.ru>, mingo@...hat.com,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Zachary Amsden <zach@...are.com>, kexec@...ts.infradead.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Eduardo Habkost <ehabkost@...hat.com>
Subject: [PATCH 10/12] x86: cpu_emergency_svm_disable() function

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>
---
 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 */
-- 
1.5.5.GIT

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