[src/trunk]: src/sys/arch/xen/x86 Do not fiddle with the event masks of non-l...

[cherry <cherry%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f225393cbac2
branches:  trunk
changeset: 772254:f225393cbac2
user:      cherry <cherry%NetBSD.org@localhost>
date:      Mon Dec 26 18:27:11 2011 +0000

description:
Do not fiddle with the event masks of non-local vcpus when unmasking events across vcpus

diffstat:

 sys/arch/xen/x86/hypervisor_machdep.c |  12 +++++++-----
 1 files changed, 7 insertions(+), 5 deletions(-)

diffs (33 lines):

diff -r 652e9537a288 -r f225393cbac2 sys/arch/xen/x86/hypervisor_machdep.c
--- a/sys/arch/xen/x86/hypervisor_machdep.c     Mon Dec 26 17:59:07 2011 +0000
+++ b/sys/arch/xen/x86/hypervisor_machdep.c     Mon Dec 26 18:27:11 2011 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: hypervisor_machdep.c,v 1.18 2011/12/03 22:41:40 bouyer Exp $   */
+/*     $NetBSD: hypervisor_machdep.c,v 1.19 2011/12/26 18:27:11 cherry Exp $   */
 
 /*
  *
@@ -54,7 +54,7 @@
 
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: hypervisor_machdep.c,v 1.18 2011/12/03 22:41:40 bouyer Exp $");
+__KERNEL_RCSID(0, "$NetBSD: hypervisor_machdep.c,v 1.19 2011/12/26 18:27:11 cherry Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -338,9 +338,11 @@
                if (!xen_atomic_test_bit(&ci->ci_evtmask[0], ev))
                        continue;
                vci = ci->ci_vcpu;
-               if (!xen_atomic_test_and_set_bit(&vci->evtchn_pending_sel,
-                   ev>>LONG_SHIFT))
-                       xen_atomic_set_bit(&vci->evtchn_upcall_pending, 0);
+               if (__predict_true(ci == curcpu())) {
+                       if (!xen_atomic_test_and_set_bit(&vci->evtchn_pending_sel,
+                               ev>>LONG_SHIFT))
+                               xen_atomic_set_bit(&vci->evtchn_upcall_pending, 0);
+               }
                if (!vci->evtchn_upcall_mask) {
                        if (__predict_true(ci == curcpu())) {
                                hypervisor_force_callback();