mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-08-31 15:22:21 -04:00
cee686775f
Commit12724ce3fe("iommu/vt-d: Optimize iotlb_sync_map for non-caching/non-RWBF modes") dynamically set iotlb_sync_map. This causes synchronization issues due to lack of locking on map and attach paths, racing iommufd userspace operations. Invalidation changes must precede device attachment to ensure all flushes complete before hardware walks page tables, preventing coherence issues. Make domain->iotlb_sync_map static, set once during domain allocation. If an IOMMU requires iotlb_sync_map but the domain lacks it, attach is rejected. This won't reduce domain sharing: RWBF and shadowing page table caching are legacy uses with legacy hardware. Mixed configs (some IOMMUs in caching mode, others not) are unlikely in real-world scenarios. Fixes:12724ce3fe("iommu/vt-d: Optimize iotlb_sync_map for non-caching/non-RWBF modes") Suggested-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/20250721051657.1695788-1-baolu.lu@linux.intel.com Signed-off-by: Will Deacon <will@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.