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

[Andreas Kinzler <ml-ak@xxxxxxxxx>]

Hello Jan, Pasi, all

> > I noticed that PCI passthrough for an LSI SAS HBA 9211 did not longer work (at 
> > least under Windows) when using Xen 4.8.1.
> > I then bisected through various released versions and finally I narrowed it 
> > down to
> > 4.5.5 (with qemu from Xen 4.6.5) -> working
> > 4.6.0-rc1 (with qemu from Xen 4.6.5) -> no longer working
> So can you please bisect which exact commit between Xen 4.5 and 4.6 causes the 
> problem?
Initially I did not bisect through unstable code as I expected to hit broken 
intermediate snapshots. But finally it worked.

I found that commit 
http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=ad28e42bd1d28d746988ed71654e8aa670629753
 is causing the problem (x86/MSI: track host and guest masking separately) 
which appeared on the mailing list already:

https://lists.xenproject.org/archives/html/xen-devel/2015-06/msg03923.html
https://lists.xenproject.org/archives/html/xen-devel/2016-04/msg00028.html

Commit 
http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=84d6add5593d865736831d150da7c38588f669f6
 does not fix it.

Attached is some first debug info.

Jan, I still have access to the hardware so perhaps we can finally solve this 
problem.

Regards Andreas

Attachment: debug.zip
Description: Zip compressed data

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