[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: pci passthrough issue introduced between 4.14.1 and 4.15.0

Jan Beulich schreef op 2021-06-01 16:33:
On 01.06.2021 16:06, AL13N wrote:
Jan Beulich schreef op 2021-06-01 12:08:
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
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

Meanwhile the proposed pciback change has gone in upstream:

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.

Well, both tests have only different tools en hypervisor, no kernel was
changed between both tests, neither in dom0 or domU , so, it might not
be pciback?

Well, if the problem was introduced in the tools and this having been
the reason for me running into the same or a similar issue, the patch
may still address the issue, even if - in case it's a regression in
the tools - it would have been better to also address the issue there.
As said, when analyzing the issue I didn't have indications of changed
tool stack behavior, i.e. I assumed the problem would have always been

Yeah after rereading the thread, i got this impression.

though after looking at a quick grep:

[alien@localhost xen]$ git log RELEASE-4.14.1..RELEASE-4.15.0 --oneline --decorate -- tools/xl/ | grep -i pci
bdc0799fe2 libxlu: introduce xlu_pci_parse_spec_string()
96ed6ff297 libxlu: introduce xlu_pci_parse_spec_string()
929f231140 libxl: introduce 'libxl_pci_bdf' in the idl...
c00da82355 libxl: add libxl_device_pci_assignable_list_free()...
7499b22ba1 libxl: make sure callers of libxl_device_pci_list() free the list after use
6c2590967f xl: s/pcidev/pci where possible

it doesn't seem like one of these? (well, i've not familiar with any of the xen code)

This mailing list is the correct place for the toolstack too? right?





Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.