IOMMU Fixes for Linux v5.17-rc2
Including:
- Warning fixes and a fix for a potential use-after-free in
IOMMU core code
- Another potential memory leak fix for the Intel VT-d driver
- Fix for an IO polling loop timeout issue in the AMD IOMMU
driver
iommu/amd: Fix loop timeout issue in iommu_ga_log_enable()
The polling loop for the register change in iommu_ga_log_enable() needs
to have a udelay() in it. Otherwise the CPU might be faster than the
IOMMU hardware and wrongly trigger the WARN_ON() further down the code
stream. Use a 10us for udelay(), has there is some hardware where
activation of the GA log can take more than a 100ms.
A future optimization should move the activation check of the GA log
to the point where it gets used for the first time. But that is a
bigger change and not suitable for a fix.
Fixes: 8bda0cfbdc1a ("iommu/amd: Detect and initialize guest vAPIC log")
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20220204115537.3894-1-joro@8bytes.org
1 file changed
