[Pkg-libvirt-maintainers] Bug#1107536: Bug#1107536: PPC64LE: Device hotplug/unplug requires guest reboot

[Andrea Bolognani]

On Wed, Jun 18, 2025 at 01:58:39AM +0530, Trupti wrote:
> On 2025-06-10 12:29, Trupti wrote:
> > On 2025-06-09 23:38, Andrea Bolognani wrote:
> > > Honestly this sounds like a guest OS issue rather than a bug in
> > > libvirt. Is any message produced in dmesg/journal as a consequence of
> > > the hotplug operation?
> > 
> > The guest dmesg shows the RTAS hot-plug signal, but no further messages
> > appear.
> 
> Hello,
> 
> I have a key update from further testing.
> 
> Libvirt appears to be working correctly, as the VM's live XML is updated
> immediately after an attach-interface command.
> 
> The main finding comes from the guest kernel log. It reveals that both
> attach-interface and detach-interface cause the guest to receive the exact
> same signal: RTAS Hotplug Event (229).
> 
> Receiving the same signal for both adding and removing a device is the
> probable cause of the hotplug failure.

More evidence that the issue is on the guest OS side, not the libvirt
side. I'm strongly inclined to close this bug at this point. Let me
know if you disagree, otherwise I'll go ahead.

Did you try using the virtio model? You didn't clarify whether this
additional testing is still happening with rtl8139, which I wouldn't
necessarily expect to work correctly for ppc64le.

-- 
Andrea Bolognani <eof at kiyuko.org>
Resistance is futile, you will be garbage collected.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <http://alioth-lists.debian.net/pipermail/pkg-libvirt-maintainers/attachments/20250620/cde0a53a/attachment.sig>