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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #2 from Alex Williamson <alex.williamson at redhat.com> ---
The IOMMU looks to be unhappy first:

[   40.201258] vfio_ecap_init: 0000:0a:00.0 hiding ecap 0x19 at 0x270
[   40.201271] vfio_ecap_init: 0000:0a:00.0 hiding ecap 0x1b at 0x2d0
[   40.201279] vfio_ecap_init: 0000:0a:00.0 hiding ecap 0x1e at 0x370
[  159.958402] AMD-Vi: Completion-Wait loop timed out
[  160.118777] AMD-Vi: Completion-Wait loop timed out
[  160.799864] AMD-Vi: Event logged [
[  160.799868] IOTLB_INV_TIMEOUT device=0a:00.0 address=0x000000043e8e8550]
[  160.799872] AMD-Vi: Event logged [
[  160.799874] IOTLB_INV_TIMEOUT device=0a:00.0 address=0x000000043e8e8570]
[  160.799876] AMD-Vi: Event logged [
[  160.799878] IOTLB_INV_TIMEOUT device=0a:00.0 address=0x000000043e8e8590]
[  161.801729] AMD-Vi: Event logged [
[  161.801732] IOTLB_INV_TIMEOUT device=0a:00.0 address=0x000000043e8e85e0]
[  180.096365] AMD-Vi: Completion-Wait loop timed out
[  180.256758] AMD-Vi: Completion-Wait loop timed out
[  180.417182] AMD-Vi: Completion-Wait loop timed out
[  180.577636] AMD-Vi: Completion-Wait loop timed out

Can you try a v4.17-rc1 kernel?  Specifically, these two updates:

6bd06f5a486c vfio/type1: Adopt fast IOTLB flush interface when unmap IOVAs
eb5ecd1a40e2 iommu/amd: Add support for fast IOTLB flushing

Something about AMD GPUs get unhappy if the IOMMU sends out too many
invalidations and the above two patches can reduce the number of those
invalidations by up to a factor of 512.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6bd06f5a486c06023a618a86e8153b91d26f75f4
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eb5ecd1a40e2098f805fb63cb07817ac48826e40

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