Re: pci passthrough issue introduced between 4.14.1 and 4.15.0

[Jan Beulich <jbeulich@xxxxxxxx>]

On 01.06.2021 09:36, AL13N wrote:
> Not 100% it's a bug or something i did wrong, but,
> 
> with xl create i start a PV with 3 pci passthroughs
> 
> after wards, xl pci-list shows all 3 nicely
> 
> looking at the domU boot logs, pcifront is only creating one pci device 
> and lspci in the guest shows only 1 pci entry
> 
> in at least 4.14.1 it still works.

This reminds me of my report at
https://lists.xen.org/archives/html/xen-devel/2021-03/msg00956.html

Meanwhile the proposed pciback change has gone in upstream:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/xen/xen-pciback?id=c81d3d24602540f65256f98831d0a25599ea6b87

I wasn't, however, aware that this may have been an issue going
from 4.14.1 to 4.15.0, i.e. something that was presumably (as
George also has just said) a regression in the tools. Or else I
probably wouldn't have suggested taking care of this in Linux.
Nevertheless you may want to give that change a try.

Jan