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:	kernel	Assignee:	Eduardo Habkost <ehabkost>
Status:	CLOSED ERRATA	QA Contact:	Red Hat Kernel QE team <kernel-qe>
Severity:	medium	Docs Contact:
Priority:	low
Version:	5.4	CC:	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 07:41:50 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	506967, 509809, 515557, 516122, 524920, 528310, 528898, 533192, 554648

Description Eduardo Habkost 2009-07-10 22:10:48 UTC

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 20:47:43 UTC

*** Bug 514912 has been marked as a duplicate of this bug. ***

Comment 6 Eduardo Habkost 2009-09-24 21:54:29 UTC

*** Bug 515112 has been marked as a duplicate of this bug. ***

Comment 8 Don Zickus 2009-10-21 19:12:23 UTC

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 13:14:21 UTC

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 2010-02-18 02:30:48 UTC

------- Comment From aliguori.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 07:41:50 UTC

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