Re: Re : Re : Re : Re : Re : Re : Re : Re: Patches for VGA-Passthrough XEN 4.2 unstable

[Tobias Geiger <tobias.geiger@vido.info>]

Hi James,

ah ok - somehow my client didnt display anything in bold, therefore my 
irritation :)

But i'm nearly equally irritated by your Problem(description)...

1st, for reference, here is my xl dmesg output regarding iommu:

(XEN) Intel VT-d Snoop Control not enabled.
(XEN) Intel VT-d Dom0 DMA Passthrough not enabled.
(XEN) Intel VT-d Queued Invalidation enabled.
(XEN) Intel VT-d Interrupt Remapping enabled.
(XEN) Intel VT-d Shared EPT tables not enabled.
(XEN) I/O virtualisation enabled

Yours indicates a few more "not enabled" features, but iirc the only 
important one here is the last "I/O virtualisation enabled", but dont 
nail me down on that;
Is "01:00.0" the output of "xl pci-list-assignable-devices" ? if not, 
you have a config/hardware problem you need to solve first.

lets assume your hardware is capable and your xen is conf'ed correct 
(xen cmdline and dom0-kernel cmdline regarding pcipassthrough and iommu) 
then:

after you installed your domu os (i assume here its windows), with 
gfx_passthrough=0 (so that the cirrus-card gets used as primary within 
domu), you should see within the qemu-vnc on localhost:5900 (or 
whereever it listens according to your domu-config), 2 Graphics-devices: 
one cirrus, working "normaly" and one representing your passed-through 
card, which is disabled because no device driver is loaded for it.
 From here on you should be able to normaly install the driver for the 
card (nvidia/ati-catalyst installer...), and after a reboot, the card 
should get initialized and bring a picture to the physically connected 
monitor of the passedtrough card.
After all that you can set gfx_passthrough=1 for the pure cosmetic 
reason that the cirrus card gets removed from the devicemanager (and you 
therefore only see the qemu-command-console when you vnc to 
localhost:5900) - but its not necessary at all.

Good luck!
Greetings
Tobias

Am 17.02.2012 12:32, schrieb Jamesffs:
> Hi Tobias, thank you for the answer.
>
> The * on my cfg appear because I used bold letter there.(They dont exists on
> my real cfg)
>
> In order to install the driver I need to see the graphic card in my Windows
> DomU, so I must passed through the card first right?
> So I used the options 'pci =  [ '01:00.0' ]' and 'gfx_passthru=1' to
> passthru the card, but when I do this (after bind the device with pci-stub)
> I just can see (through VNC) a screen with qemu console and after a while
> the DomU crash. When u said before that it is not possible to see the DomU
> with VNC I thought that I should use a monitor attached to the graphic card
> but Im not sure how to do that.
>
> Anyway Im start thinking that the DomU crash is due to VT-d is not enabled
> properly, after using the parameter iommu=1 i have the following output in
> xl dmesg:
>
> (XEN) I/O virtualisation enabled
> .
> .
> (XEN) Intel VT-d Snoop Control not enabled.
> (XEN) Intel VT-d Dom0 DMA Passthrough not enabled.
> (XEN) Intel VT-d Queued Invalidation not enabled.
> (XEN) Intel VT-d Interrupt Remapping not enabled.
> (XEN) Intel VT-d Shared EPT table not enabled.
>
> So maybe the problem is there...
>
> Well thank you for your help
>
>
> --
> View this message in context: http://xen.1045712.n5.nabble.com/Patches-for-VGA-Passthrough-XEN-4-2-unstable-tp4406265p5492208.html
> Sent from the Xen - Dev mailing list archive at Nabble.com.
>
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