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

[Andreas Kinzler <ml-ak@xxxxxxxxx>]

Hello,

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
4.6.4, 4.7.2, 4.8.1 -> no longer working

dom0 kernel is 4.8.17 but that should not matter.

PCI passthrough is still working when initializing the controller BIOS in 
Seabios, but when Windows starts
it is stuck in an endless loop of spinning dots (see first seconds of 
https://www.youtube.com/watch?v=3za5fsfYftQ).
My guess is that is has something to do with PCI enumeration.

Any ideas? Help?

Regards Andreas

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