Re: Supporting Nvidia and ATI

[Dor Laor <dor.laor-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Caleb Moore wrote:
> On Sun, 2007-11-11 at 18:46 +0200, Ghiora Drori wrote:
>   
>> Hi,
>> I am interested in supporting NVDIA, ATI, Intel and presumably other 
>> display cards when running a windows guest KVM. The idea is to get 
>> Windows XP games to work properly under kvm when being hosted by
>> Linux. 
>> The screen on Linux can have more then one X windows server running on
>> different TTYs and it looks (I have not checked the code) like each is
>> running separately (aka there is a store and initialize when switching
>> between them) so when a kvm guest would get such a screen it would
>> have direct access to the display hardware. 
>> I searched Google but did not find anything significant. 
>> Any ideas where to start?
>>     
>
> For that it would probably be simplest to allow the VMM to write to the
> AGP/PCIe device.
>
> An graphics card hardware interface consists of two parts, a normal PCI
> device and a GART. The PCI interface is pretty simple, it's just a table
> containing useful information about memory regions, IRQs and IOports
> that the device will read/write to. You'll need to make an emulated PCI
> device that will map in real regions of the physical address space into
> the virtual machine. The GART is a little bit more complex, it will
> require a virtualised GART driver for your guest kernel that requests
> memory regions from the host kernel's GART interface, puts them in the
> guests address space and returns their addresses to the guest kernel.
>
> I hope that helps.
>
>
>   
Some of the work was released already by us and some will be released soon:
If you have 1-1 mapping between the guest addresses and the host you 
solve the gart mapping:
http://lkml.org/lkml/2007/10/21/125.
We also released pci passthrough and irq forwarding for qemu/kvm.
http://news.gmane.org/gmane.comp.emulators.kvm.devel/cutoff=9470
Together you can make it work (we have a passthrough NIC working).
Dor.

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