Quick hint from investigating.
I installed the librust-virtiofsd-dev and virtiofsd as in 24.04 it is not
standard anymore via apt.
Still VMs are not working.
Problem: for the older VM which had posix=on and flock=on in the virtiofsd
section in the XML file I had to remove it --> Solved the issue
Problem: virtualfsd cannot write to /var/log/libvirt/qemu
Not working: rw right on the /var/log/libvirt/qemu
Disabling AppArmor for libvirtd -> reboot -> solved the problem but is only a
workaround
Still, reason unknown as in the apparmor profile: "libvirtd" the permissions
for virtiofsd are good:
/usr/{lib,lib64,lib/qemu,libexec}/virtiofsd PUx,
is in and should include the new /usr/libexec/virtiofsd as ok to run.
As I am not an AppArmor specalist, no glue why this was the issue.
I hope my short analysis is helping you as with this I got my machines running
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https://bugs.launchpad.net/bugs/2054222
Title:
virtiofsd is no longer installed by default in 24.04 when virt-
manager/qemu is installed.
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