Does this diff help
Index: x86/cpu.c
===================================================================
RCS file: /cvsroot/src/sys/arch/x86/x86/cpu.c,v
retrieving revision 1.158
diff -u -r1.158 cpu.c
--- x86/cpu.c 22 Jun 2018 06:22:37 -0000 1.158
+++ x86/cpu.c 26 Jun 2018 13:25:18 -0000
@@ -877,23 +877,9 @@
* interrupts off.
*/
while ((ci->ci_flags & CPUF_GO) == 0) {
- if ((cpu_feature[1] & CPUID2_MONITOR) != 0) {
- x86_monitor(&ci->ci_flags, 0, 0);
- if ((ci->ci_flags & CPUF_GO) != 0) {
- continue;
- }
- x86_mwait(0, 0);
- } else {
- /*
- * XXX The loop repetition count could be a lot higher, but
- * XXX currently qemu emulator takes a _very_long_time_ to
- * XXX execute the pause instruction. So for now, use a low
- * XXX value to allow the cpu to hatch before timing out.
- */
for (i = 50; i != 0; i--) {
x86_pause();
}
- }
}
/* Because the text may have been patched in x86_patch(). */
