** Also affects: linux-nvidia-6.14 (Ubuntu Noble)
Importance: Undecided
Status: New
** Changed in: linux-nvidia-6.14 (Ubuntu)
Status: New => Invalid
** Changed in: linux-nvidia-6.14 (Ubuntu Noble)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/2121415
Title:
Backport: iommu/arm-smmu-v3: Fix smmu_domain->nr_ats_masters decrement
Status in linux-nvidia-6.14 package in Ubuntu:
Invalid
Status in linux-nvidia-6.14 source package in Noble:
Fix Committed
Bug description:
This upstream (v6.17-rc3) fix addresses an issue where the ats master
tracking can become corrupted during a SMMU attachment when the state
changes. This can lead to odd side effects as the count does not
represent the actual state of the hardware. Backport fix to 6.14-HWE.
Lore discussion:
https://lore.kernel.org/r/[email protected]
Upstream SHA: 685ca577b408 iommu/arm-smmu-v3: Fix smmu_domain->nr_ats_masters
decrement
Tested with host and guest kernels using GPU passthrough. This commit
picked cleanly to 24.04_linux-nvidia-6.14-next.
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