Bug 742836

Summary:	Setting multifunction=on breaks SPICE/QXL multihead support in Windows
Product:	[Fedora] Fedora	Reporter:	Laine Stump <laine>
Component:	libvirt	Assignee:	Laine Stump <laine>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	16	CC:	berrange, clalancette, crobinso, dougsland, itamar, jforbes, laine, veillard, virt-maint
Target Milestone:	---	Keywords:	Regression
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	libvirt-0.9.6-2.fc16	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-10-09 19:50:53 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:

Description Laine Stump 2011-10-03 03:44:32 UTC

Description of problem:
Since libvirt started adding multifunction=on to PCI devices, SPICE/QXL multihead support in Windows no longer works.

Version-Release number of selected component (if applicable):

libvirt-0.9.3-1.el6

Steps to Reproduce:
1. Create a Windows XP guest with SPICE graphics + QXL display adapter
2. Install QXL graphics device driver in Windows
3. Stop the guest
4. Add a second <video> element to the guest for QXL display adapter
5. Start the guest again
6. Configure the QXL device driver for the second display

Actual results:
Windows fails to start the QXL device driver with an error 'Code 10'

Expected results:
The second device is initialized.

---

In response to a suggestion by Dan Berrange on libvir-list:

  https://www.redhat.com/archives/libvir-list/2011-September/msg01036.html

I pushed the following patch to upstream libvirt, which removes the automatic setting of the multifunction bit, in favor of an XML attribute to turn it on as desired:

commit c329db7180d77c8077b9f9cd167a71d7f347227a
Author: Laine Stump <laine>
Date:   Thu Sep 29 13:00:32 2011 -0400

    qemu: make PCI multifunction support more manual
    
This allows exact control of when the multifunction bit should be turned on/off for each slot/function on the guest's PCI bus, eliminating the issue with the QXL driver's (and possibly/probably other drivers') lack of multifunction support.

Comment 1 Fedora Update System 2011-10-03 16:06:55 UTC

libvirt-0.9.6-2.fc16 has been submitted as an update for Fedora 16.
https://admin.fedoraproject.org/updates/libvirt-0.9.6-2.fc16

Comment 2 Fedora Update System 2011-10-03 17:45:17 UTC

Package libvirt-0.9.6-2.fc16:
* should fix your issue,
* was pushed to the Fedora 16 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing libvirt-0.9.6-2.fc16'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/libvirt-0.9.6-2.fc16
then log in and leave karma (feedback).

Comment 3 Fedora Update System 2011-10-09 19:50:53 UTC

libvirt-0.9.6-2.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.