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-rw-r--r--arch/x86/include/asm/virtext.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h
index 6f0d409c368..2cfe363729c 100644
--- a/arch/x86/include/asm/virtext.h
+++ b/arch/x86/include/asm/virtext.h
@@ -107,4 +107,18 @@ static inline int cpu_has_svm(const char **msg)
return 1;
}
+
+/** Disable SVM on the current CPU
+ *
+ * You should call this only if cpu_has_svm() returned true.
+ */
+static inline void cpu_svm_disable(void)
+{
+ uint64_t efer;
+
+ wrmsrl(MSR_VM_HSAVE_PA, 0);
+ rdmsrl(MSR_EFER, efer);
+ wrmsrl(MSR_EFER, efer & ~MSR_EFER_SVME_MASK);
+}
+
#endif /* _ASM_X86_VIRTEX_H */