[Xen-users] Dom0 freeze on HVM DomU Windows reboot with VGA passthrough

[Howell Tam <pigeon@xxxxxxxxxxx>]

Hi,


        I'm doing VGA passthrough for an ATI (HD 6770) graphics card to
a DomU Windows. The passthrough itself is working. However, everytime
when I reboot the DomU Windows, the whole machine freezes.


        I see no error messages from Dom0 kernel or the xen qemu log
(or perhaps I haven't got the most verbose debugging turned on?).
Though from what I can tell, the the freeze happens when DomU
starts again, not the shutdown.


        Is there any pointers on how I could debug this?


        Xen 4.2.1, Dom0 is Linux 3.2.36, with xl passthrough. I have
tried both WinXP and Win7 and both shows the same result.


        Thanks!

-- 
Regards,
Howell.


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