Bug 1244347

Summary:	Quirk for Chelsio T5 MSI-X PBA
Product:	Red Hat Enterprise Linux 7	Reporter:	Alex Williamson <alex.williamson>
Component:	qemu-kvm	Assignee:	Alex Williamson <alex.williamson>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.2	CC:	alex.williamson, chayang, juzhang, michen, mrezanin, rbalakri, virt-maint, xfu
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	qemu-kvm-1.5.3-98.el7	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:
Clones:	1244348 (view as bug list)		Environment:
Last Closed:	2015-11-19 05:11:42 UTC	Type:	Bug
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:	1244348

Description Alex Williamson 2015-07-17 20:35:14 UTC

Description of problem:
Chelsio T5 adapters incorrectly list the MSI-X Pending Bit Array (PBA) table at an offset beyond the PCI BAR containing it.  The guest does not use the PBA, but vfio does as part of mapping device regions for the guest.  When attempting to assign one of these devices to a VM, the call to msix_init() will fail due to this inconsistency.  A quirk has been added to the QEMU vfio-pci driver correct this problem in the case of a Chelsio T5 adapter and error with a useful message indicating a hardware problem in the general case.


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


How reproducible:
100%

Steps to Reproduce:
1. Attempt to assign Chelsio T5 to a guest
2.
3.

Actual results:
Device fails to attach on hot plug, VM startup failure on cold plug (presumably, we don't have any)

Expected results:
Device attaches/VM starts

Additional info:
Upstream patch:
http://git.qemu.org/?p=qemu.git;a=commitdiff;h=43302969966bc3a95470bfc300289a83068ef5d9

Comment 7 Miroslav Rezanina 2015-07-24 18:16:18 UTC

Fix included in qemu-kvm-1.5.3-98.el7

Comment 10 juzhang 2015-08-03 03:47:02 UTC

According to comment9, set this issue as verified.

Comment 12 errata-xmlrpc 2015-11-19 05:11:42 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.

https://rhn.redhat.com/errata/RHBA-2015-2213.html