Bug 674663

Summary:	vlapic: Fix possible guest tick losing after save/restore
Product:	Red Hat Enterprise Linux 5	Reporter:	Paolo Bonzini <pbonzini>
Component:	kernel-xen	Assignee:	Paolo Bonzini <pbonzini>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	5.6	CC:	drjones, leiwang, lersek, qguan, qwan, xen-maint
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-02-21 03:30:16 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:	514490, 648852

Description Paolo Bonzini 2011-02-02 20:44:59 UTC

From http://permalink.gmane.org/gmane.comp.emulators.xen.devel/94955:

> Guest vcpu may totally lose all ticks if the vlapic->pt.irq was not restored 
> during save/restore process. Fix it.

This is upstream c/s 22470.

No testcase, but the bug is present in our version of vlapic too.

Comment 3 Laszlo Ersek 2011-07-13 17:21:17 UTC

Paolo posted
http://post-office.corp.redhat.com/archives/rhkernel-list/2011-July/msg00609.html

Comment 4 RHEL Program Management 2011-08-04 04:14:22 UTC

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.

Comment 7 Jarod Wilson 2011-08-23 13:59:29 UTC

Patch(es) available in kernel-2.6.18-282.el5
You can download this test kernel (or newer) from http://people.redhat.com/jwilson/el5
Detailed testing feedback is always welcomed.

Comment 9 Qin Guan 2012-01-18 07:54:29 UTC

Testing of this problem is covered by running acceptance/functional test with several Snapshot builds (from Snapshot1 to Snapshot4). 

No any problem found during the testing, marked it as Verified:SanityOnly.

Comment 11 errata-xmlrpc 2012-02-21 03:30:16 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2012-0150.html