Bug 510814

Summary: CPU hotplug notifiers for KVM (for suspend and cpu hotplug support)
Product: Red Hat Enterprise Linux 5 Reporter: Eduardo Habkost <ehabkost>
Component: kernelAssignee: Eduardo Habkost <ehabkost>
Status: CLOSED ERRATA QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: medium Docs Contact:
Priority: low    
Version: 5.4CC: bugproxy, dzickus, lihuang, mjenner, riel, tburke
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-03-30 03:41:50 EDT Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
Bug Depends On:    
Bug Blocks: 533192, 506967, 509809, 515557, 516122, 524920, 528310, 528898, 554648    

Description Eduardo Habkost 2009-07-10 18:10:48 EDT
In order to support suspend-to-disk and suspend-to-RAM while using KVM, additions are needed on the kernel CPU hotplug support. This patch in special: http://lkml.org/lkml/2007/5/24/108

From the patch description:

"KVM wants a notification when a cpu is about to die, so it can disable
hardware extensions, but at a time when user processes cannot be scheduled
on the cpu, so it doesn't try to use virtualization extensions after they
have been disabled."
Comment 4 Eduardo Habkost 2009-08-26 16:47:43 EDT
*** Bug 514912 has been marked as a duplicate of this bug. ***
Comment 6 Eduardo Habkost 2009-09-24 17:54:29 EDT
*** Bug 515112 has been marked as a duplicate of this bug. ***
Comment 8 Don Zickus 2009-10-21 15:12:23 EDT
in kernel-2.6.18-170.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Please do NOT transition this bugzilla state to VERIFIED until our QE team
has sent specific instructions indicating when to do so.  However feel free
to provide a comment indicating that this fix has been verified.
Comment 10 lihuang 2010-01-31 08:14:21 EST
on kernel-2.6.18-170.el5.  host s3/s4  cpu online/offline works fine
on kernel-2.6.18-185.el5.  host cpu online/offline works fine, but s3/s4 failed due to an another kernel bug 550014. 

related test can be found in : 
https://bugzilla.redhat.com/show_bug.cgi?id=506967#c41
https://bugzilla.redhat.com/show_bug.cgi?id=509809#c19
https://bugzilla.redhat.com/show_bug.cgi?id=515557#c24
https://bugzilla.redhat.com/show_bug.cgi?id=524920#c10
https://bugzilla.redhat.com/show_bug.cgi?id=528310#c9
Comment 11 IBM Bug Proxy 2010-02-17 21:30:48 EST
------- Comment From aliguori@us.ibm.com 2010-02-17 21:17 EDT-------
From LTC BZ #54637 Comment #13:

"I  verified that the issue is fixed on an x3200 M2 running the
RHEL5.5 beta 2.6.18-186.el5 kernel.  Closing."

Marking as VERIFIED.
Comment 14 errata-xmlrpc 2010-03-30 03:41:50 EDT
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2010-0178.html