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

On Nov 29,  1:09pm, Pasi =?iso-8859-1?Q?K=E4rkk=E4inen?= wrote:
} Subject: Re: [Xen-devel] Q77 IGD instantly crashes on xen-pciback bind.

Good morning Pasi, thanks for taking the time to follow up.

> > > > 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.

I just fired up a pass-through session to check on this.  The driver
version and date are as follows:

        Driver Date:            09/26/2014
        Driver Version:

They were the most current version of the driver available on Intel's
website as of a week ago.

As soon as we sort out the details on whether or not we can get the
IGD device re-started we will put a patch up on our FTP server with
the changes needed to implement both ATI and IGD passthrough on 4.4.1
as a resource to the community.

> Thanks,
> -- Pasi

Have a good day.


}-- End of excerpt from Pasi =?iso-8859-1?Q?K=E4rkk=E4inen?=

As always,
Dr. G.W. Wettstein, Ph.D.   Enjellic Systems Development, LLC.
4206 N. 19th Ave.           Specializing in information infra-structure
Fargo, ND  58102            development.
PH: 701-281-1686
FAX: 701-281-3949           EMAIL: greg@xxxxxxxxxxxx
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