Re: [Xen-users] Video Passthrough

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 2015-03-23 19:56, CACook@xxxxxxxxxxxxxxx wrote:
> Has anyone been able to actually get video passthrough working in 4.5?
I haven't tried 4.5 - I last used 4.3 and that worked for me.
I have now switched to KVM (as of last weekend) due to Nvidia's
abandonment of Xen dom0 support. It means one fewer VM/console
on my setup.

> I've followed all the (unwritten) rules, like having pciback compiled
> in to the kernel,
I never had it compiled in, and it worked fine. You just have to
make sure you blacklist all the drivers that could pre-emptively
claim the device, and write a script in /etc/sysconfig/modules/
to load and bind pcibacl to all the devices you want to pass
through, and only then load the drivers for any other similar
hardware you have.

> and setting device_model_version =
> "qemu-xen-traditional". And I've set gfx_passthru=1 and
> pci=['00:02.0'].
I never used gfx_passthru=1, either. It's only for
primary passthrough, and AFAIK that generally only
works for passing through the primary GPU on the host
(otherwise you have to side-load the BIOS and get
SeaBIOS or OVMF to POST it).

> But I get a blank screen. Using VNC to get into the VM, the PCI video
> card is clearly there and has the right driver. (i915) And the console
> goes blank as it should, but stays blank even after the VM is started.
> Video passthrough doesn't work.
So you are trying to use Intel GPU for passthrough? I cannot
say I ever tried. The only passthrough GPUs I used with complete
success are Nvidia's.



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