Re: trustGuestRxFilters broken after upgrade to Debian 12

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On 1/23/24 16:17, Michal Prívozník wrote:
> On 1/20/24 09:03, Paul B. Henson wrote:
>> We've been running Debian 11 for a while, using sr-iov:
>> <network>
>>   <name>sr-iov-intel-10G-1</name>
>>   <uuid>6bdaa4c8-e720-4ea0-9a50-91cb7f2c83b1</uuid>
>>   <forward mode='hostdev' managed='yes'>
>>     <pf dev='eth2'/>
>>   </forward>
>> </network>
>> and allocating vf's from the pool:
>>     <interface type='network' trustGuestRxFilters='yes'>
>>       <mac address='52:54:00:08:da:5b'/>
>>       <source network='sr-iov-intel-10G-1'/>
>>       <vlan>
>>         <tag id='50'/>
>>       </vlan>
>>       <model type='virtio'/>
>>       <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
>>     </interface>
>> After upgrading to Debian 12, when I try to start any vm which uses the
>> trustGuestRxFilters option, it fails to start with the message:
>> error: internal error: unable to execute QEMU command 'query-rx-filter':
>> invalid net client name: hostdev0
> I think it may be a regression caused by the following commit:
> (contained in libvirt-8.9.0)
> In two functions (qemuProcessRefreshState() and qemuProcessReconnect())
> there's a call to qemuProcessRefreshRxFilters() added. And since you
> have trustGuestRxFilters='yes' it then proceeds and queries QEMU on the
> monitor for MAC address.
> Let me see if I can cook up a patch, since I'm the one who broke it.

In fact, there's an easy reproducer without any SRIOV involved: just try
to start a domain with <interface type='direct' trustGuestRxFilters='yes'/>
and !virtio model (say rtl8139).

Patch posted here:

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