Re: [Xen-users] VGA passthrough with Xen 4.3 and xl toolstack - performance degradation resolved?

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 03/12/2014 08:12 PM, H. Sieger wrote:
> Now you really made me curious. I have two ATI cards (a Sapphire Radeon
> 7770 and a Sapphire Radeon 6450) in two different PCs and could use them
> for a test in my rig, running it from a Xen installation on an external
> USB drive so I won't have to compromise my regular system. Just need to
> find the time.
>
> Your experience is also in contradiction with the Xen wiki:
> http://wiki.xen.org/wiki/Xen_VGA_Passthrough_Tested_Adapters.
Not contradictory, my definition of "working" just happens to be more 
stringent.
> I have collected user reports of successful VGA passthrough - see here:
> http://www.overclock.net/t/1307834/xen-vga-passthrough-compatible-graphics-adapters.
> There aren't too many posts there, some do mention guest reboot issues,
> but it seems there are few. Each card that's been listed should have a
> link to a user report.
I suggest you just try it. I don't think there's a single person on this 
list that will tell you that ATI cards work just fine across domU 
reboots. This is also why it is imperative you blacklist your radeon and 
fglrx modules in dom0. If you don't, the driver will initialize the card 
before it is taken over by the pci-stub driver, and you'll have the same 
problem on the initial domU boot.
Gordan

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