GPU passthrough support for Stoney [Radeon R2/R3/R4/R5 Graphics]?

[Micah Morton]

Hi folks,

I'm interested in running a VM on a system with an integrated Stoney
[Radeon R2/R3/R4/R5 Graphics] card and passing through the graphics card to
the VM using the IOMMU. I'm wondering whether this is feasible and supposed
to be doable with the right setup (as opposed to passing a discrete GPU to
the VM, which I think is definitely doable?).

So far, I can do all the qemu/kvm/vfio/iommu stuff to run the VM and pass
the integrated GPU to it, but the drm driver in the VM fails during
amdgpu_device_init(). Specifically, the logs show the SMU being
unresponsive, which leads to a 'SMU firmware load failed' error message and
kernel panic. I can share VM logs and the invocation of qemu and such if
helpful, but first wanted to know at a high level if this should be
feasible?

P.S.: I'm not initializing the GPU in the host bios or host kernel at all,
so I should be passing a fresh GPU to the VM. Also, I'm pretty sure I'm
running the correct VGA bios for this GPU in the guest VM bios before guest
boot.

Any comments/suggestions would be appreciated!

Micah
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