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linux-stable/drivers/iommu/intel
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Lu Baolu da8669ff41 iommu/vt-d: Drop stop marker messages 
The page fault handling framework in the IOMMU core explicitly states
that it doesn't handle PCI PASID Stop Marker and the IOMMU drivers must
discard them before reporting faults. This handles Stop Marker messages
in prq_event_thread() before reporting events to the core.

The VT-d driver explicitly drains the pending page requests when a CPU
page table (represented by a mm struct) is unbound from a PASID according
to the procedures defined in the VT-d spec. The Stop Marker messages do
not need a response. Hence, it is safe to drop the Stop Marker messages
silently if any of them is found in the page request queue.

Fixes: d5b9e4bfe0 ("iommu/vt-d: Report prq to io-pgfault framework")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20220421113558.3504874-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20220423082330.3897867-2-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2022-04-28 11:01:53 +02:00
..
cap_audit.c iommu/vt-d: Fix an unbalanced rcu_read_lock/rcu_read_unlock() 2021-11-26 22:54:47 +01:00
cap_audit.h iommu/vt-d: Check FL and SL capability sanity in scalable mode 2021-10-18 12:31:48 +02:00
debugfs.c iommu/vt-d: Remove DEFER_DEVICE_DOMAIN_INFO 2022-03-04 16:46:30 +01:00
dmar.c iommu/vt-d: Move intel_iommu_ops to header file 2022-03-04 16:46:31 +01:00
iommu.c iommu/vt-d: Calculate mask for non-aligned flushes 2022-04-28 11:01:06 +02:00
irq_remapping.c iommu/vt-d: Fix potential memory leak in intel_setup_irq_remapping() 2022-01-31 16:53:09 +01:00
Kconfig iommu/sva: Rename CONFIG_IOMMU_SVA_LIB to CONFIG_IOMMU_SVA 2022-02-14 19:17:46 +01:00
Makefile iommu/vt-d: Add common code for dmar latency performance monitors 2021-06-10 09:06:13 +02:00
pasid.c iommu/vt-d: Remove DEFER_DEVICE_DOMAIN_INFO 2022-03-04 16:46:30 +01:00
pasid.h iommu/vt-d: Remove guest pasid related callbacks 2022-02-28 13:25:48 +01:00
perf.c iommu/vt-d: Drop the kernel doc annotation 2021-08-19 10:41:08 +02:00
perf.h iommu/vt-d: Add common code for dmar latency performance monitors 2021-06-10 09:06:13 +02:00
svm.c iommu/vt-d: Drop stop marker messages 2022-04-28 11:01:53 +02:00
trace.c