Otherwise EFER_LMA bit is retained across a SIPI reset.

Fixes guest cpu onlining.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Index: kvm/arch/x86/kvm/svm.c
===================================================================
--- kvm.orig/arch/x86/kvm/svm.c
+++ kvm/arch/x86/kvm/svm.c
@@ -816,7 +816,7 @@ static void init_vmcb(struct vcpu_svm *s
 	init_sys_seg(&save->ldtr, SEG_TYPE_LDT);
 	init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16);
 
-	save->efer = EFER_SVME;
+	svm_set_efer(&svm->vcpu, 0);
 	save->dr6 = 0xffff0ff0;
 	save->dr7 = 0x400;
 	save->rflags = 2;