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

[Christian König]

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.
>
>
> Also, I wonder if BAR resizing could work with APUs?

At least trivial to implement.

The host had to resize the BAR for the client or otherwise the client 
could easily bring down the system.

Christian.