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Bug 1973642 - [RHEL9]PF fails to be hot-unplugged in RT VM
Summary: [RHEL9]PF fails to be hot-unplugged in RT VM
Keywords:
Status: CLOSED WORKSFORME
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: qemu-kvm
Version: 9.0
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: beta
: ---
Assignee: Michael S. Tsirkin
QA Contact: Yanghang Liu
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-06-18 11:41 UTC by Pei Zhang
Modified: 2023-04-27 03:37 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2022-12-02 14:35:46 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
VM XML (4.31 KB, application/xml)
2021-06-18 11:41 UTC, Pei Zhang 		no flags Details
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Description Pei Zhang 2021-06-18 11:41:19 UTC 
Created attachment 1792034 [details]
VM XML

This bug was initially created as a copy of Bug #1887895

I am copying this bug because: 

Description of problem:
Boot RT VM in RT host, then hot plug/unplug PF devices, unplug will fail.

Version-Release number of selected component (if applicable):
5.13.0-0.rc4.33.rt3.4.el9.x86_64
qemu-kvm-6.0.0-5.el9.x86_64
libvirt-7.4.0-1.el9.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Boot RT VM, full xml is attached.

2. Hot plug PFs (XL710, i40e NIC), successfully.

# cat nic1.xml 
<hostdev mode='subsystem' type='pci' managed='yes'>
  <driver name='vfio'/>
  <source>
    <address domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
  </source>
  <address type='pci' domain='0x0000' bus='0x06' slot='0x00' function='0x0'/>
</hostdev>

# cat nic2.xml 
<hostdev mode='subsystem' type='pci' managed='yes'>
  <driver name='vfio'/>
  <source>
    <address domain='0x0000' bus='0x04' slot='0x00' function='0x1'/>
  </source>
  <address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>
</hostdev>

In host: 
# virsh attach-device rhel9.0_rt_8vcpu nic1.xml
Device attached successfully

# virsh attach-device rhel9.0_rt_8vcpu nic2.xml
Device attached successfully

In VM, the PF is plugged well:
# lspci | grep Eth
01:00.0 Ethernet controller: Red Hat, Inc. Virtio network device (rev 01)
06:00.0 Ethernet controller: Intel Corporation Ethernet Controller XL710 for 40GbE QSFP+ (rev 02)
07:00.0 Ethernet controller: Intel Corporation Ethernet Controller XL710 for 40GbE QSFP+ (rev 02)


3. Hot unplug PFs, fails. In VM, the PFs still exist in VM and not be unplugged successfully.

# virsh detach-device rhel9.0_rt_8vcpu nic1.xml
Device detached successfully

# virsh detach-device rhel9.0_rt_8vcpu nic2.xml
Device detached successfully

# lspci | grep Eth
01:00.0 Ethernet controller: Red Hat, Inc. Virtio network device (rev 01)
06:00.0 Ethernet controller: Intel Corporation Ethernet Controller XL710 for 40GbE QSFP+ (rev 02)
07:00.0 Ethernet controller: Intel Corporation Ethernet Controller XL710 for 40GbE QSFP+ (rev 02)


Additional info:
1. In RHEL(non-RT) setup, this issue cannot be triggered.

RHEL versions which work as expected:
5.13.0-0.rc4.33.el9.x86_64
qemu-kvm-6.0.0-5.el9.x86_64
libvirt-7.4.0-1.el9.x86_64
Comment 1 John Ferlan 2021-07-08 15:09:14 UTC 
Updating assignment to match the cloned from bug 1887895 in order to ensure both bugs are addressed in both releases.
Comment 4 John Ferlan 2022-11-23 17:20:33 UTC 
Marcelo - the automatic close date is approaching on this RHEL9 version of a bug you took over from mst last year. 

Since QE used "copy" from and not "cloned" from the linkage to bug 1887895 got lost.

In any case, in your estimation/opinion - could this also be closed as current release?  Or should we look to extend the stale date and resolve?
Comment 5 Marcelo Tosatti 2022-12-02 14:35:46 UTC 
The original bug could not be reproduced:
https://bugzilla.redhat.com/show_bug.cgi?id=1887895#c55

So will close this BZ one similar reasoning.

Please reopen BZ if issue can be reproduced.
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