Re: [Xen-devel] Regression PCI passthrough from 4.5.5 to 4.6.0-rc1

["Andreas Kinzler" <hfp@xxxxxxxxx>]

On Mon, 14 Aug 2017 13:56:58 +0200, Roger Pau Monné <roger.pau@xxxxxxxxxx>  
wrote:
> > > I defined XEN_PT_LOGGING_ENABLED in xen_pt.h as requested without the
> > > "hack" patch. Log is attached. Does it help?
> > It tells me that there's nothing unexpected on that side. As I think I
> > had indicated before, we really need to see both sides (qemu and
> > hypervisor), as part of the MSI-X handling lives in Xen. And for the
> > hypervisor side it is unlikely that we'll be able to get away without
> > a debugging patch. I am intending to make such available to you in
> > case you can't do so yourself, but I can't currently predict when I'll
> > get to it.
> I think the problem is that pci_msi_conf_write_intercept is failing to
> unmask the entries when MSI-X is enabled with entries already
> configured, but this will require some debugging patch as Jan said.
> Following the MSI-X code is quite complicated, this split brain
> between Xen and QEMU makes it quite hard. I can try to come up with a
> patch later.
I can try some debug patches although my workload is very high at the  
moment. It would help me quite a bit if the debug patches were suitable  
for the stable 4.8 tree.
Regards Andreas

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