Re: [Xen-devel] GFX Passthrough

[Tobias Geiger <tobias.geiger@xxxxxxxxx>]

Hi,

i don't know if FLR is necessary - my motherboard has it (Intel DX58SO, also 
explicitly enabled in the BIOS), but i don't know if its a strict requirement, 
sorry.

VGA output on the attached monitor starts with the guest OS (windows xp i.e.), 
meaning i dont see the qemu-bios output, no. First thing i see is the Windows-
Logo like this: 
http://www.simplehelp.net/images/boot_windows_faster/boot_faster00.png)

Greetings
Tobias

Am Montag 10 Mai 2010 17:39:56 schrieb listmail:
> When secondary vga pt is used, is FLR still required?  Do you have vga
> output as soon as the qemu bios comes up?  Or is it what some people
> report where output doesn't show up until later on in the kernel/windows
> boot process?   I have been hoping that maybe some experimental patches
> for FLR support crop up to test vga pt again on my 8800gts.
> 
> Tobias Geiger wrote:
> > Hi List,
> >
> > many People seem to be interested in the Graphic-Card Passthrough Feature
> > (for more or less obvious reasons).
> >
> > Official Support is still under development, and i hope not to interfere
> > with it in any (bad) way ...
> >
> > But i remember my own painfull and timeconsuming research when i wanted
> > this feature to work, so i thought perhaps this spares some time for the
> > unpatient users like me :)
> >
> > So here is what i did to enable Passthrough of my Secondary PCIE
> > Graphic-Card which is a NVIDIA GT200;
> >
> > Key thing seems to be the Patches 1 to 4
> > (Patch #5 is only so that i have alsa-backed sound emulation , for some
> > reason i have only oss-backed if not applied ?!)
> >
> > Before all that, you need to read out the VGA Bios of the
> > to-be-passthroughed- Graphiccard with a tool; i used nvflash.exe under
> > DOS for this task. The patches assume you saved this file as
> > "vgabios-pt.bin"
> >
> > 1. check out xen unstable:
> >     hg clone http://xenbits.xensource.com/xen-unstable.hg
> > 2. go into there and do an "initial build" so that qemu-dm gets
> > checked-out: cd  xen-unstable.hg; cd tools; make ; make clean
> > 3. apply the patches from within the "xen-unstable.hg" dir, with patch
> > -p0 4. move the vgabios-pt.bin to "tools/firmware/vgabios/"
> > 4. do a "make install"
> >
> > Thats it.
> >
> > Warning: a "make clean" deletes the "vgabios-pt.bin" file , so remember
> > to put it there again before your next "make" ...
> >
> > After that, and assuming your hardware/bios is VT-D ready and your
> > XEN-PCI Config is correct (kernel-cmdline, xen-configfile), the HVM guest
> > should be able to work with the passedthrough-Graphicscard.
> >
> > Greetings, Good luck, and THANK YOU XEN-GUYS!
> > Tobias
> >
> > P.S.: NONE of the patches are my origin. they were gathered from here
> > (xen- devel) and endless google-researches, representing the hard
> > brainwork of much smarter guys than me ;)
> >
> > ------------------------------------------------------------------------
> >
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> 
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