| commit | 93116ac0cf9734e7b28886aedf03848b37d6785e | |
| author | Christian Borntraeger <borntraeger@de.ibm.com> | |
| Sun, 20 Nov 2011 23:12:03 +0000 (20 23:12 +0000) | ||
| committer | Alexander Graf <agraf@suse.de> | |
| Wed, 4 Jan 2012 01:48:14 +0000 (4 02:48 +0100) | ||
| tree | f142c2a7018762c1537176d7d6b48fb087978a9e | treesnapshot (tar.gz zip) |
| parent | 7d77793d6bf5ecb784040aef946ff7b4d52f2d2a | commitdiff |
s390: fix cpu hotplug / cpu activity on interrupts
The add_del/running_cpu code and env->halted are tracking stopped cpus.
Sleeping cpus (idle and enabled for interrupts) are waiting inside the
kernel.
No interrupt besides the restart can move a cpu from stopped to
operational. This is already handled over there. So lets just remove
the bogus wakup from the common interrupt delivery, otherwise any
interrupt will wake up a cpu, even if this cpu is stopped (Thus leading
to strange hangs on sigp restart)
This fixes
echo 0 > /sys/devices/system/cpu/cpu0/online
echo 1 > /sys/devices/system/cpu/cpu0/online
in the guest
Signed-off-by: Christian Borntraeger<borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
The add_del/running_cpu code and env->halted are tracking stopped cpus.
Sleeping cpus (idle and enabled for interrupts) are waiting inside the
kernel.
No interrupt besides the restart can move a cpu from stopped to
operational. This is already handled over there. So lets just remove
the bogus wakup from the common interrupt delivery, otherwise any
interrupt will wake up a cpu, even if this cpu is stopped (Thus leading
to strange hangs on sigp restart)
This fixes
echo 0 > /sys/devices/system/cpu/cpu0/online
echo 1 > /sys/devices/system/cpu/cpu0/online
in the guest
Signed-off-by: Christian Borntraeger<borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
| target-s390x/kvm.c | diffblobblamehistory |