Public bug reported:
I have a network configured like this (/etc/libvirt/qemu/networks/en4.xml):
<network>
<name>en4</name>
<uuid>163f7064-5a07-4fff-8510-63ac4868ab24</uuid>
<forward mode='hostdev' managed='yes'>
<pf dev='eno4'/>
</forward>
</network>
If I use this network in a qemu VM like this:
<interface type='network'>
<mac address='52:54:00:11:22:33'/>
<source network='en4'/>
<model type='rtl8139'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x09'
function='0x0'/>
</interface>
I get an error like this when trying to start it using virsh:
qemu-system-x86_64: -device
vfio-pci,host=05:01.0,id=hostdev0,bus=pci.0,addr=0x9: vfio error: 0000:05:01.0:
failed to open /dev/vfio/34: Permission denied
However, as soon as I pass any device through (e.g. a <hostdev> instead
of <interface>), the permission error goes away.
So to me, it looks like when <interface> is using a network that uses a
hostdev, libvirt does not set the proper permissions to allow qemu to
access the vfio.
---
Description: Ubuntu 18.04.3 LTS
Release: 18.04
libvirt-daemon:
Installed: 4.0.0-1ubuntu8.12
Candidate: 4.0.0-1ubuntu8.12
** Affects: libvirt (Ubuntu)
Importance: Undecided
Status: New
** Tags: interface vfio
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https://bugs.launchpad.net/bugs/1840552
Title:
Permission denied when using vfio with interface pools
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