[Bug 106111] [GPU Passthrough]GPU (Polaris) not reinitialized with Linux VM (Reset bug)

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=106111

--- Comment #4 from Alex Williamson <alex.williamson@redhat.com> ---
There is a difference, now we have:

[   84.997634] vfio_ecap_init: 0000:0a:00.0 hiding ecap 0x19@0x270
[   84.997645] vfio_ecap_init: 0000:0a:00.0 hiding ecap 0x1b@0x2d0
[   84.997653] vfio_ecap_init: 0000:0a:00.0 hiding ecap 0x1e@0x370
[  145.518307] vfio_ecap_init: 0000:0a:00.0 hiding ecap 0x19@0x270
[  145.518313] vfio_ecap_init: 0000:0a:00.0 hiding ecap 0x1b@0x2d0
[  145.518318] vfio_ecap_init: 0000:0a:00.0 hiding ecap 0x1e@0x370

So prior to time 145.5 the VM was shutdown and started again and we could still
read config space of the device.  Previously we were already getting IOMMU
faults before the second startup.  But shortly after:

[  193.328586] AMD-Vi: Completion-Wait loop timed out
[  193.488711] AMD-Vi: Completion-Wait loop timed out
[  194.169913] iommu ivhd0: AMD-Vi: Event logged [
[  194.169921] iommu ivhd0: IOTLB_INV_TIMEOUT device=0a:00.0
address=0x000000043e8aaca0]
[  194.169924] iommu ivhd0: AMD-Vi: Event logged [
[  194.169928] iommu ivhd0: IOTLB_INV_TIMEOUT device=0a:00.0
address=0x000000043e8aacc0]

And the stuck in D3 state is evidence that the device is no longer accessible
on the bus.  So that only delayed the issue, some interaction between the IOMMU
and GPU is still failing.

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