Comment # 2
on bug 106111
from Alex Williamson
The IOMMU looks to be unhappy first: [ 40.201258] vfio_ecap_init: 0000:0a:00.0 hiding ecap 0x19@0x270 [ 40.201271] vfio_ecap_init: 0000:0a:00.0 hiding ecap 0x1b@0x2d0 [ 40.201279] vfio_ecap_init: 0000:0a:00.0 hiding ecap 0x1e@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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