KVM: SVM: Allow EFER.LMSLE to be set with nested svm

This patch enables setting of efer bit 13 which is allowed
in all SVM capable processors. This is necessary for the
SLES11 version of Xen 4.0 to boot with nested svm.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/include/asm/msr-index.h

@@ -20,13 +20,15 @@
 #define _EFER_LMA		10 /* Long mode active (read-only) */
 #define _EFER_NX		11 /* No execute enable */
 #define _EFER_SVME		12 /* Enable virtualization */
+#define _EFER_LMSLE		13 /* Long Mode Segment Limit Enable */
 #define _EFER_FFXSR		14 /* Enable Fast FXSAVE/FXRSTOR */
 
 #define EFER_SCE		(1<<_EFER_SCE)
 #define EFER_LME		(1<<_EFER_LME)
 #define EFER_LMA		(1<<_EFER_LMA)
 #define EFER_NX			(1<<_EFER_NX)
 #define EFER_SVME		(1<<_EFER_SVME)
+#define EFER_LMSLE		(1<<_EFER_LMSLE)
 #define EFER_FFXSR		(1<<_EFER_FFXSR)
 
 /* Intel MSRs. Some also available on other CPUs */

arch/x86/kvm/svm.c

@@ -640,7 +640,7 @@ static __init int svm_hardware_setup(void)
 
 	if (nested) {
 		printk(KERN_INFO "kvm: Nested Virtualization enabled\n");
-		kvm_enable_efer_bits(EFER_SVME);
+		kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE);
 	}
 
 	for_each_possible_cpu(cpu) {