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linux/drivers/iommu/intel
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Lu Baolu fb5873b779 iommu/vt-d: Restore context entry setup order for aliased devices 
commit 320302baed upstream.

Commit 2031c469f8 ("iommu/vt-d: Add support for static identity domain")
changed the context entry setup during domain attachment from a
set-and-check policy to a clear-and-reset approach. This inadvertently
introduced a regression affecting PCI aliased devices behind PCIe-to-PCI
bridges.

Specifically, keyboard and touchpad stopped working on several Apple
Macbooks with below messages:

 kernel: platform pxa2xx-spi.3: Adding to iommu group 20
 kernel: input: Apple SPI Keyboard as
 /devices/pci0000:00/0000:00:1e.3/pxa2xx-spi.3/spi_master/spi2/spi-APP000D:00/input/input0
 kernel: DMAR: DRHD: handling fault status reg 3
 kernel: DMAR: [DMA Read NO_PASID] Request device [00:1e.3] fault addr
 0xffffa000 [fault reason 0x06] PTE Read access is not set
 kernel: DMAR: DRHD: handling fault status reg 3
 kernel: DMAR: [DMA Read NO_PASID] Request device [00:1e.3] fault addr
 0xffffa000 [fault reason 0x06] PTE Read access is not set
 kernel: applespi spi-APP000D:00: Error writing to device: 01 0e 00 00
 kernel: DMAR: DRHD: handling fault status reg 3
 kernel: DMAR: [DMA Read NO_PASID] Request device [00:1e.3] fault addr
 0xffffa000 [fault reason 0x06] PTE Read access is not set
 kernel: DMAR: DRHD: handling fault status reg 3
 kernel: applespi spi-APP000D:00: Error writing to device: 01 0e 00 00

Fix this by restoring the previous context setup order.

Fixes: 2031c469f8 ("iommu/vt-d: Add support for static identity domain")
Closes: https://lore.kernel.org/all/4dada48a-c5dd-4c30-9c85-5b03b0aa01f0@bfh.ch/
Cc: stable@vger.kernel.org
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20250514060523.2862195-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20250520075849.755012-2-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-06-27 11:11:21 +01:00
..
cache.c iommu/vt-d: Fix qi_batch NULL pointer with nested parent domain 2024-12-19 18:13:06 +01:00
cap_audit.c iommu/vt-d: Remove virtual command interface 2023-03-31 10:03:21 +02:00
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 debugfs use of private data field 2024-04-26 11:57:38 +02:00
dmar.c iommu/vt-d: Fix suspicious RCU usage 2025-03-07 18:25:42 +01:00
iommu.c iommu/vt-d: Restore context entry setup order for aliased devices 2025-06-27 11:11:21 +01:00
iommu.h iommu/vt-d: Restore context entry setup order for aliased devices 2025-06-27 11:11:21 +01:00
irq_remapping.c iommu/vt-d: Wire up irq_ack() to irq_move_irq() for posted MSIs 2025-04-20 10:15:48 +02:00
Kconfig dma-mapping: direct calls for dma-iommu 2024-08-22 06:18:11 +02:00
Makefile iommu/vt-d: Add cache tag assignment interface 2024-04-26 11:57:40 +02:00
nested.c iommu/vt-d: Restore context entry setup order for aliased devices 2025-06-27 11:11:21 +01:00
pasid.c Merge branches 'fixes', 'arm/smmu', 'intel/vt-d', 'amd/amd-vi' and 'core' into next 2024-09-13 12:53:05 +02:00
pasid.h iommu/vt-d: Remove control over Execute-Requested requests 2024-07-03 16:39:26 +01:00
perf.c iommu/vt-d: Use kcalloc() instead of kzalloc() 2024-03-01 13:51:18 +01:00
perf.h iommu/vt-d: Remove debugfs use of private data field 2024-04-26 11:57:38 +02:00
perfmon.c iommu/vt-d: Clean up cpumask and hotplug for perfmon 2024-09-10 11:44:13 +02:00
perfmon.h iommu/vt-d: Add IOMMU perfmon support 2023-02-03 11:06:06 +01:00
svm.c iommu/vt-d: Add qi_batch for dmar_domain 2024-09-02 18:15:02 +02:00
trace.c iommu/vt-d: Move trace/events/intel_iommu.h under iommu 2022-07-15 10:21:28 +02:00
trace.h tracing/treewide: Remove second parameter of __assign_str() 2024-05-22 20:14:47 -04:00