main_loop: do not set nonblocking if xen_enabled()

Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com>
CC: qemu-stable@nongnu.org

vl.c

@@ -2022,7 +2022,7 @@ static void main_loop(void)
     int64_t ti;
 #endif
     do {
-        nonblocking = !kvm_enabled() && last_io > 0;
+        nonblocking = !kvm_enabled() && !xen_enabled() && last_io > 0;
 #ifdef CONFIG_PROFILER
         ti = profile_getclock();
 #endif