GEM allocation for para-virtualized DRM driver

[Rob Clark]

On Sat, Mar 18, 2017 at 10:44 AM, Oleksandr Andrushchenko
<andr2000 at gmail.com> wrote:
>>>>    then TTM might be useful.
>>>
>>> I was looking into it, but it seems to be an overkill in my case
>>> And isn't it that GEM should be used for new drivers, not TTM?
>>
>> Not really, it's just that (other than amdgpu which uses TTM) all of
>> the newer drivers have been unified memory.
>
> Good to know, thank you
>>
>>    A driver for a new GPU
>> that had vram of some sort should still use TTM.
>
> our virtual GPU support is done on hypervisor level, so no changes to
> existing GPU drivers. So, the only thing to care about is that the
> buffers our DRM driver provides can be imported and used by that GPU
> (there are other issues related to memory, e.g. if real GPU/firware can
> see the memory of the guest, but this is another story)


jfwiw, it might be useful to have a look at the intel GVT stuff.. they
have recently (4.10) added para-virt support to i915

BR,
-R