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linux/drivers/iommu/intel
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Lu Baolu 89bd620798 iommu/vt-d: Remove WO permissions on second-level paging entries 
commit eea53c5816 upstream.

When the first level page table is used for IOVA translation, it only
supports Read-Only and Read-Write permissions. The Write-Only permission
is not supported as the PRESENT bit (implying Read permission) should
always set. When using second level, we still give separate permissions
that allows WriteOnly which seems inconsistent and awkward. We want to
have consistent behavior. After moving to 1st level, we don't want things
to work sometimes, and break if we use 2nd level for the same mappings.
Hence remove this configuration.

Suggested-by: Ashok Raj <ashok.raj@intel.com>
Fixes: b802d070a5 ("iommu/vt-d: Use iova over first level")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210320025415.641201-3-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2021-05-19 10:13:17 +02:00
..
debugfs.c iommu/vt-d: Rename intel-pasid.h to pasid.h 2020-07-24 10:51:21 +02:00
dmar.c iommu/vt-d: Correctly check addr alignment in qi_flush_dev_iotlb_pasid() 2021-02-03 23:28:50 +01:00
iommu.c iommu/vt-d: Remove WO permissions on second-level paging entries 2021-05-19 10:13:17 +02:00
irq_remapping.c iommu/intel: Fix memleak in intel_irq_remapping_alloc 2021-01-17 14:17:03 +01:00
Kconfig IOMMU Updates for Linux v5.9 2020-08-11 14:13:24 -07:00
Makefile iommu/vt-d: Move Kconfig and Makefile bits down into intel directory 2020-07-29 14:14:55 +02:00
pasid.c iommu/vt-d: Report right snoop capability when using FL for IOVA 2021-05-14 09:50:32 +02:00
pasid.h iommu/vt-d: Report right snoop capability when using FL for IOVA 2021-05-14 09:50:32 +02:00
svm.c iommu/vt-d: Report the right page fault address 2021-05-14 09:50:33 +02:00
trace.c iommu/vt-d: Move Intel IOMMU driver into subdirectory 2020-06-10 17:46:43 +02:00