KVM: x86 emulator: allow pop from mmio

Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
index 2555762..70242f5f 100644
--- a/arch/x86/kvm/x86_emulate.c
+++ b/arch/x86/kvm/x86_emulate.c
@@ -1063,9 +1063,9 @@
 	struct decode_cache *c = &ctxt->decode;
 	int rc;
 
-	rc = ops->read_std(register_address(c, ss_base(ctxt),
-					    c->regs[VCPU_REGS_RSP]),
-			   &c->src.val, c->src.bytes, ctxt->vcpu);
+	rc = ops->read_emulated(register_address(c, ss_base(ctxt),
+						 c->regs[VCPU_REGS_RSP]),
+				&c->src.val, c->src.bytes, ctxt->vcpu);
 	if (rc != 0)
 		return rc;