[Bug 101946] Rebinding AMDGPU causes initialization errors [R9 290]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101946

--- Comment #25 from Luke A. Guest <laguest at archeia.com> ---
> Hi Luke, few questions. When booting the host, do you boot with amdgpu or vfio-pci bound to the GPU? After you've started a VM, did you bind back to amdgpu or did you stay on vfio-pci?

I have 2 AMD GPU's, R9 390 (host) and R9 380 (guest). I boot with the 380 being
passed over to vfio-pci. On exit the VM sets the 380 back to vfio-pci.

> Is it during vfio or amdgpu control that your system hangs on the second boot?

It was during a boot of the VM, the devices were attached to the vfio-pci
driver.

> If it's during amdgpu, have you tried my patch from comment 20?

I haven't tried it, I don't think it would apply to my card as it's VI not CIK.
Although, if I were using the 390 (CIK) it likely would. The issues are similar
though and I believe I've just proved that the so called hw reset bug, in may
case anyway, is sw not hw.

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