[PATCH] drm/amdgpu/gmc: use PCI BARs for APUs in passthrough

[Michel Dänzer]

On 2022-03-11 18:43, Michel Dänzer wrote:
> On 2022-03-11 11:32, Christian König wrote:
>> Am 11.03.22 um 11:24 schrieb Michel Dänzer:
>>> On 2022-03-10 19:06, Alex Deucher wrote:
>>>> If the GPU is passed through to a guest VM, use the PCI
>>>> BAR for CPU FB access rather than the physical address of
>>>> carve out.  The physical address is not valid in a guest.
>>> I think amdgpu_device_flush_hdp & amdgpu_device_invalidate_hdp need to be modified accordingly.
> 
> I'm surprised you gave your R-b despite this. Surely the HDP cache needs to be handled when going through the BAR?

I'm a bit confused why there's still been no response on this point from either of you. Are you guys checking internally whether or not this is needed?


-- 
Earthling Michel Dänzer            |                  https://redhat.com
Libre software enthusiast          |         Mesa and Xwayland developer