Re: [Xen-users] Xen second VGA passthrough

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sun, Mar 20, 2011 at 11:41:32PM +0100, Marek Kaszycki wrote:
> To answer the question, Xen >= 4.0.0 supports secondary VGA passthrough:
> Xen 4.0.0 supports VGA passthrough of the primary graphics adapter (the  
> one that gets initialized and is used when you power-on the computer)  
> only. VGA passthrough of secondary graphics adapters currently requires  
> additional extra patches to Xen.
>
> So far I've been unable to find those extra patches (mainly because I 
> have just one graphics board in the PC), but it's possible.
>
> This does raise one question for me, though... I know this seems rather  
> far-fetched, but is it possible to pass a secondary output port to DomU,  
> while using a primary output port in Dom0? My 5850 has four outputs,  
> 2×DVI, 1 HDMI and 1 DP.

Xen VGA passthru is based on PCI passthru, so you can dedicate (passthru)
single PCI device to (only) single VM. 

Your display adapter is probably just a single device, so no, 
you can't have different output to different VM using VGA passthru.

Unless you have some kind of multiplexing going on,
like in Citrix XenClient, where V4V is used for virtual graphics in VMs.

-- Pasi

> This goes further -- would it be possible to use a KVM switch to route 
> the keyboard, mouse and DVI to separate I/O ports? I know the idea sounds 
> wild, but it would enable live switching between domains -- map two USB  
> ports and one video output to Dom0 and two other USB ports and another  
> video output to DomU?
>



> Regards,
> Marek
>
>
> Dnia 20-03-2011 o 19:41:48 Baoning He <amyd99@xxxxxxxxx> napisa?(a):
>
>> Hi Guys,
>>
>> Sorry to disturb you, I'm a newbie of xen lists.
>>
>> Does anybody can tell me whether Xen >= 4.0.1 support second vga
>> passthrough or not.
>> I had searched in lists and google, no explicit answer found.
>>
>> Thanks
>> Bob
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