Description of problem:
If we offline a cpu, we can no longer put it back with our latest kernel
This only happens with the kvm-kmod module enabled. Without it, it goes fine.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. echo 0 > /sys/devices/system/cpu/cpuX/online
2. echo 1 > /sys/devices/system/cpu/cpuX/online
cpu goes down, but do not come back
it goes down, but then comes back again
Host CPU hotplug isn't supported with the KVM modules loaded: https://bugzilla.redhat.com/show_bug.cgi?id=516122
We need this to make it work:
Oops, I pasted the wrong URL. The cpu-hotplug-not-supported bug is:
Should be fixed by the fix for bug #510814. Moving to POST to reflect the fix status.
The fix for bug #510814 (that should solve this bug) is in kernel-2.6.18-170.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5
Testing is welcome.
Moving bug to KVM, as the kernel side of the change (and probably the only change needed) is bug #510814.
test in kernel-2.6.18-170.el5/ kmod-kvm-83-105.el5_4.9
(refer to Bug 515557#c23)
retest in kernel -185.el5. PASS
setting to VERIFIED.