From: Eduardo Habkost <ehabkost@redhat.com>
Date: Mon, 17 Nov 2008 21:03:22 +0000 (-0200)
Subject: x86: cpu_emergency_svm_disable() function
X-Git-Tag: v2.6.29-rc1~539^2~70
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0f3e9eeba0ea212bbea88790729d054b700ab91e;p=karo-tx-linux.git

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@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---

diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h
index 2cfe363729c3..593636275238 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 */