KVM: SVM: move svm_hardware_disable() code to asm/virtext.h

Create cpu_svm_disable() function.

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

1 files changed, 14 insertions, 0 deletions

diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h
index 6f0d409c3682..2cfe363729c3 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 */