** Also affects: linux-gcp (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: linux-gcp-5.19 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-gcp-5.19 (Ubuntu Kinetic)
Status: New => Invalid
** Changed in: linux-gcp (Ubuntu Jammy)
Status: New => Invalid
** Changed in: linux-gcp-5.19 (Ubuntu Jammy)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/2023313
Title:
gcp: backport "iommu/amd: Add map/unmap_pages() iommu_domain_ops
callback support"
Status in linux-gcp package in Ubuntu:
In Progress
Status in linux-gcp-5.19 package in Ubuntu:
New
Status in linux-gcp source package in Jammy:
Invalid
Status in linux-gcp-5.19 source package in Jammy:
Fix Committed
Status in linux-gcp source package in Kinetic:
In Progress
Status in linux-gcp-5.19 source package in Kinetic:
Invalid
Bug description:
GCP is requesting the backport of the patch "6b080c4e815ceba3c08f
iommu/amd: Add map/unmap_pages() iommu_domain_ops callback support"
from upstream 6.2 to the 5.19 gcp kernel
The following two patches are required for the backport:
6b080c4e815ceba3c08ffa980c858595c07e7 iommu/amd/io-pgtable: Implement
map_pages io_pgtable_ops callback
251c4db699ca7b966db7e59e8663a231c96ba iommu/amd/io-pgtable: Implement
unmap_pages io_pgtable_ops callback
More info at
https://canonical.lightning.force.com/lightning/r/Case/5008e00000CjJJCAA3/view
Impact:
- This allows the AMD iommu driver to map/unmap multiple pages in one call.
GCP states that these changes also have a security side-effect which they are
interested in.
Testing:
- Boot-tested the changes in SEV, SEV-SNP and non-SEV environments on AMD
hardware.
Regression potential:
- The changes are limited to the AMD iommu driver. Regression potential
could impact virtualization on AMD hardware. Risk is considered low as the
changes are limited and apply cleanly from upstream. The requested patch is
from 6.2 and there have been no follow-up fixes since.
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