Re: [Xen-devel] Q77 IGD instantly crashes on xen-pciback bind.

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Nov 28, 2014 at 08:00:40PM -0600, Dr. Greg Wettstein wrote:
> On Nov 27, 12:11pm, Sander Eikelenboom wrote:
> } Subject: Re: [Xen-devel] Q77 IGD instantly crashes on xen-pciback bind.
> 
> Hi, hope the week has gone well for everyone.
>

Hello, hopefully your weekend is going well.

 
> > > So we are obviously working with qemu-dm-traditional and with the
> > > IGD/LVDS BIOS configuration issue fixed the adapater passthrough is
> > > working and Windows7 is coming up and detecting the IGD as a standard
> > > VGA display adapter.  Additional invocations of the VM after the first
> > > one result in failed passthrough with a garbled display.
> 
> > This is probably due to the current lack of slot/bus reset in
> > xen-pciback, Konrad has a preliminary kernel patch for xen-pciback
> > that does this.  I have attached the patch, though it has some rough
> > edges in the design :-)
> >
> > I'm currently running with his 3.19 xen-pciback patches series + the
> > preliminary patch for slot/bus reset and rebooting a guest with
> > vga/pci passthrough now works. (i'm running with a radeon card,
> > passed through as a secondary card to the emulated qemu one, in a
> > linux guest using qemu-xen, so i can't help you with your other
> > questions and problems).
> 
> Thanks for taking the time for respond and forward along the patch.
> 
> I back ported the do_flr patch into the 3.14.x kernel and spent some
> time working with it.  I thought it might be useful to others to
> document what we ran into.
> 
> First of all the issue with the unsuccessful boot of Windows after the
> first invocation doesn't appear to have anything to do with resetting
> the card.  This was fixed by installing the most recent version of the
> Intel HD drivers in the Windows guest.
> 
> If IGD passthrough is done without the HD drivers Windows 7 appears to
> use its standard VGA driver which seems to be able to initialize and
> run the IGD device but does not appear to shutdown the device in a
> manner in which it can be re-started.  After the first invocation of
> the guest is shutdown the screen goes to a solid color.  Subsequent
> invocations result in the flashing multi-color screens which others
> have documented.
> 
> With the HD drivers installed IGD passthrough works fine through
> multiple invocations of a guest with the stock xen-pciback in 3.14.x.
> We ran 40-50 repetitive Windows guest invocations and every one was
> completely deterministic.
>

It would be nice if you could let us know the exact Intel IGD Windows driver 
version
that worked well for you? It might be a good reference for others aswell.


Thanks,
 
-- Pasi


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