IOMMU Fixes for Linux v4.3-rc7
Two late fixes for the AMD IOMMU driver:
* One adds an additional check to the io page-fault handler to
avoid a BUG_ON being hit in handle_mm_fault()
* Second patch fixes a problem with devices writing to the
system management area and were blocked by the IOMMU because
the driver wrongly cleared out the DTE flags allowing that
access.
iommu/amd: Don't clear DTE flags when modifying it
During device assignment/deassignment the flags in the DTE
get lost, which might cause spurious faults, for example
when the device tries to access the system management range.
Fix this by not clearing the flags with the rest of the DTE.
Reported-by: G. Richard Bellamy <rbellamy@pteradigm.com>
Tested-by: G. Richard Bellamy <rbellamy@pteradigm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2 files changed
