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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.
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 ***