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Bug 1897710 - live attach of virtiofs file device fails
Summary: live attach of virtiofs file device fails
Keywords:
Status: CLOSED INSUFFICIENT_DATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: qemu-kvm
Version: ---
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: 8.0
Assignee: Virtualization Maintenance
QA Contact: menli@redhat.com
URL:
Whiteboard:
Depends On:
Blocks: 1887471 1897708
TreeView+ depends on / blocked
 
Reported: 2020-11-13 20:44 UTC by Tom Barron
Modified: 2021-12-07 22:45 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2020-11-17 21:34:45 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Tom Barron 2020-11-13 20:44:17 UTC 
Description of problem:

  # virsh attach-device --live <domain> filesystem.xml

yields:

  error: Failed to attach device from filesystem.xml
  error: Operation not supported: live attach of device 'filesystem' is not supported

whereas:

  # virsh attach-device --persistent <domain> filesystem.xml

works and with subsequent 'virsh start' of the domain and an accompanying virtiofsd process sharing between host and guest works fine.

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

[test@osp-storage-04 ~]$ virsh --version
6.0.0


How reproducible:

100%

Steps to Reproduce:
1.  Define a domain with shared memory backing and numa topology as at https://libvirt.org/kbase/virtiofs.html
2.  virsh start the guest VM
3.  attempt 'virsh attach-device --live <domain> filesystem.xml' with appropriate XML device configuration as described at the just-mentioned Kbase.

Actual results:

Error message as reported.

Expected results:  Successful hot-plug attach of the virtiofs files sytem to the running guest.

Would expect corresponding 'virsh detatch-device --live ...' commands to work as well.

Additional info:

We need this to work for OpenStack Nova to support virtiofs devices.

It could be that all the work for this fix is in libvirt and will be done in BZ1897708.  I will make that BZ depend on this one in case there is also work needed in qemu-kvm to enable hotplug support.
Comment 1 Ademar Reis 2020-11-17 21:34:45 UTC 
Let's start with the libvirt BZ you've already opened, then the team will identify if any and which work is needed in QEMU.

*** This bug has been marked as a duplicate of bug 1897708 ***
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