x86 svm: Fix svm_update_guest_efer() after c/s 19856.

Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
index a47c083458a947579b21a3ebd88edc1db8ca96c8..aae51c0e05c7a7db61c4864e195aaef75bc7c963 100644 (file)
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -452,7 +452,7 @@ static void svm_update_guest_cr(struct vcpu *v, unsigned int cr)
 static void svm_update_guest_efer(struct vcpu *v)
 {
     struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
-    bool_t lma = v->arch.hvm_vcpu.guest_efer & EFER_LMA;
+    bool_t lma = !!(v->arch.hvm_vcpu.guest_efer & EFER_LMA);
 
     vmcb->efer = (v->arch.hvm_vcpu.guest_efer | EFER_SVME) & ~EFER_LME;
     if ( lma )