Bug 2162569

Summary:	[transitional device][virtio-rng-pci-transitional]Stable Guest ABI failed between RHEL 8.6 to RHEL 9.2
Product:	Red Hat Enterprise Linux 9	Reporter:	Min Deng <mdeng>
Component:	qemu-kvm	Assignee:	Virtualization Maintenance <virt-maint>
qemu-kvm sub component:	Live Migration	QA Contact:	Min Deng <mdeng>
Status:	CLOSED ERRATA	Docs Contact:
Severity:	medium
Priority:	medium	CC:	coli, jinzhao, juzhang, lijin, nilal, virt-maint
Version:	9.2	Keywords:	Regression, Triaged
Target Milestone:	rc
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	qemu-kvm-7.2.0-8.el9	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-05-09 07:23:43 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 Min Deng 2023-01-20 02:15:10 UTC

Description of problem:
[transitional device][virtio-rng-pci-transitional]Stable Guest ABI failed between RHEL 8.6 to RHEL 9.2 

Version-Release number of selected component (if applicable):
RHEL8.6
kernel-4.18.0-372.41.1.el8_6.x86_64
qemu-kvm-6.2.0-28.module+el8.8.0+17721+63bacee8.x86_64
RHEL9.2
kenrel-5.14.0-234.el9.x86_64
qemu-kvm-7.2.0-5.el9.x86_64


How reproducible:
5/5
Steps to Reproduce:
1.
On src,
/usr/libexec/qemu-kvm -device virtio-rng-pci-transitional,id=rng0 -monitor stdio -cpu Icelake-Server -machine pc-q35-rhel8.6.0
On dst
/usr/libexec/qemu-kvm -device virtio-rng-pci-transitional,id=rng0 -monitor stdio -cpu Icelake-Server -machine pc-q35-rhel8.6.0 -incoming defer
2. migration vm 

Actual results:
(qemu) qemu-kvm: get_pci_config_device: Bad config data: i=0x34 read: 84 device: 98 cmask: ff wmask: 0 w1cmask:0
qemu-kvm: Failed to load PCIDevice:config
qemu-kvm: Failed to load virtio-rng:virtio
qemu-kvm: error while loading state for instance 0x0 of device '0000:00:03.0/virtio-rng'
qemu-kvm: load of migration failed: Invalid argument


Expected results:
Migration successfully 


Additional info:
Notes
it's not reproducible with -device virtio-rng-pci because it has been fixed in bug Bug 2155749

Comment 1 Dr. David Alan Gilbert 2023-02-07 17:51:08 UTC

Posted upstream: [PATCH] virtio-rng-pci: fix transitional migration compat for vectors

Comment 2 Dr. David Alan Gilbert 2023-02-07 18:41:17 UTC

Please try this build:

https://kojihub.stream.centos.org/koji/taskinfo?taskID=1914745

(hopefully the right bug this time...)

Comment 3 Min Deng 2023-02-09 10:20:42 UTC

Tried above build from comment2
RHEL9.2
qemu-kvm-7.2.0-7.el9.root202302071825.x86_64
RHEL8.6
qemu-kvm-6.2.0-11.module+el8.6.0+17576+33ee06a8.7.x86_64
...
--> Running case(5/17): RHEL-289325-POST-COPY-[stable guest abi][x86_q35]do post-copy migration with "-M rhel8.6.0" machine type (6 min 28 sec)--- PASS.
--> Running case(6/17): RHEL-289325-[stable guest abi][x86_q35]do forward and backward migration with "-M rhel8.6.0" machine type (8 min 36 sec)--- PASS.
...

The patch works well, thanks.

Comment 4 Dr. David Alan Gilbert 2023-02-09 12:20:15 UTC

Thanks for testing!

Comment 6 Yanan Fu 2023-02-13 08:55:28 UTC

QE bot(pre verify): Set 'Verified:Tested,SanityOnly' as gating/tier1 test pass.

Comment 9 Min Deng 2023-02-14 14:16:23 UTC

Verified the bug on the following builds
RHEL8.6
qemu-kvm-6.2.0-11.module+el8.6.0+18167+43cf40f3.8.x86_64
kernel-4.18.0-372.45.1.el8_6.x86_64
RHEL9.2
kernel-5.14.0-265.el9.x86_64
qemu-kvm-7.2.0-8.el9.x86_64

--> Running case(5/17): RHEL-289325-POST-COPY-[stable guest abi][x86_q35]do post-copy migration with "-M rhel8.6.0" machine type (6 min 20 sec)--- PASS.
--> Running case(6/17): RHEL-289325-[stable guest abi][x86_q35]do forward and backward migration with "-M rhel8.6.0" machine type (8 min 36 sec)--- PASS.

Comment 13 errata-xmlrpc 2023-05-09 07:23:43 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 (Moderate: qemu-kvm security, bug fix, and enhancement update), 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://access.redhat.com/errata/RHSA-2023:2162