On Mon, May 17, 2021 at 11:49:13AM +0800, Lu Baolu wrote:
[ Upstream commit a8ce9ebbecdfda3322bbcece6b3b25888217f8e3 ]
The Access/Dirty bits in the first level page table entry will be set whenever a page table entry was used for address translation or write permission was successfully translated. This is always true when using the first-level page table for kernel IOVA. Instead of wasting hardware cycles to update the certain bits, it's better to set them up at the beginning.
Suggested-by: Ashok Raj ashok.raj@intel.com Signed-off-by: Lu Baolu baolu.lu@linux.intel.com Link: https://lore.kernel.org/r/20210115004202.953965-1-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel jroedel@suse.de Signed-off-by: Sasha Levin sashal@kernel.org
drivers/iommu/intel/iommu.c | 14 ++++++++++++-- include/linux/intel-iommu.h | 2 ++ 2 files changed, 14 insertions(+), 2 deletions(-)
[Note:
- This is a reworked patch of https://lore.kernel.org/stable/20210512144819.664462530@linuxfoundation.org/....
- It aims to fix a reported issue of https://bugzilla.kernel.org/show_bug.cgi?id=213077.
- Please help to review and test.]
What stable tree(s) is this supposed to be for?
thanks,
greg k-h