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 <[email protected]> Signed-off-by: Avi Kivity <[email protected]>
redpig · Dec 31, 2008 · 0f3e9ee · 0f3e9ee
1 parent 2c8dcee
commit 0f3e9ee
Showing 1 changed file with 8 additions and 0 deletions.
diff --git 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 */