Re: [Xen-devel] Broken PCI device passthrough, after XSA-302 fix?

[Jan Beulich <jbeulich@xxxxxxxx>]

On 19.01.2020 11:39, Pasi Kärkkäinen wrote:
> On Mon, Jan 06, 2020 at 02:06:14PM +0100, Jan Beulich wrote:
>> On 04.01.2020 02:07, Marek Marczykowski-Górecki  wrote:
>>> I have a multi-function PCI device, behind a PCI bridge, that normally
>>> I assign to a single domain. But now it fails with:
>>>
>>> (XEN) [VT-D]d14: 0000:04:00.0 owned by d0!<G><0>assign 0000:05:00.0 to 
>>> dom14 failed (-22)
>>
>> I've tried this out in as close a setup as I could arrange for, but
>> not one matching your scenario. I didn't find a system with a
>> suitably placed (in the topology) multi-function device (had to use
>> a single-function one), and of course I did this on (close to)
>> master. No anomalies. Hence I wonder whether either of the two
>> differences mentioned matters, and - if, as I suspect, it's the
>> multi-function aspect that is relevant here - how things would have
>> worked at all before those recent changes. This is because I think
>> you should have hit the same error path even before, and it would
>> seem to me that the patch below might be (and have been) needed.
>>
> 
> I think Marek confirmed in the other mail that this patch fixes the issue.
> 
> Are you planning to merge this patch?

Well, it is still pending a maintainer ack. Kevin has requested a
(mechanical) change just over the weekend.

Jan

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