kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-11-08 18:57:22 +00:00
Code Issues Releases Packages Activity
linux/drivers/iommu/intel
History
Lu Baolu dc46e9ca38 iommu/vt-d: PRS isn't usable if PDS isn't supported 
commit 5ef7e24c74 upstream.

The specification, Section 7.10, "Software Steps to Drain Page Requests &
Responses," requires software to submit an Invalidation Wait Descriptor
(inv_wait_dsc) with the Page-request Drain (PD=1) flag set, along with
the Invalidation Wait Completion Status Write flag (SW=1). It then waits
for the Invalidation Wait Descriptor's completion.

However, the PD field in the Invalidation Wait Descriptor is optional, as
stated in Section 6.5.2.9, "Invalidation Wait Descriptor":

"Page-request Drain (PD): Remapping hardware implementations reporting
 Page-request draining as not supported (PDS = 0 in ECAP_REG) treat this
 field as reserved."

This implies that if the IOMMU doesn't support the PDS capability, software
can't drain page requests and group responses as expected.

Do not enable PCI/PRI if the IOMMU doesn't support PDS.

Reported-by: Joel Granados <joel.granados@kernel.org>
Closes: https://lore.kernel.org/r/20250909-jag-pds-v1-1-ad8cba0e494e@kernel.org
Fixes: 66ac4db36f ("iommu/vt-d: Add page request draining support")
Cc: stable@vger.kernel.org
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20250915062946.120196-1-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-10-19 16:37:27 +02:00
..
cache.c IOMMU Updates for Linux v6.17: 2025-07-30 10:42:00 -07:00
debugfs.c iommu/vt-d: debugfs: Fix legacy mode page table dump logic 2025-10-15 12:04:03 +02:00
dmar.c iommu/vt-d: Remove the CONFIG_X86 wrapping from iommu init hook 2025-07-14 11:18:03 +01:00
iommu.c iommu/vt-d: PRS isn't usable if PDS isn't supported 2025-10-19 16:37:27 +02:00
iommu.h iommu/vt-d: Disallow dirty tracking if incoherent page walk 2025-10-15 12:04:09 +02:00
irq_remapping.c ARM: 2025-07-30 17:14:01 -07:00
Kconfig iommu/vt-d: Move IOMMU_IOPF into INTEL_IOMMU 2024-11-05 13:32:26 +01:00
Makefile iommu: make inclusion of intel directory conditional 2025-05-16 08:46:46 +02:00
nested.c iommu/vt-d: Create unique domain ops for each stage 2025-07-14 11:18:03 +01:00
pasid.c iommu/vt-d: Lift the __pa to domain_setup_first_level/intel_svm_set_dev_pasid() 2025-07-14 11:18:03 +01:00
pasid.h iommu/vt-d: Lift the __pa to domain_setup_first_level/intel_svm_set_dev_pasid() 2025-07-14 11:18:03 +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
prq.c iommu/vtd: Remove iommu_alloc_pages_node() 2025-04-17 16:22:54 +02:00
svm.c iommu/vt-d: Create unique domain ops for each stage 2025-07-14 11:18:03 +01:00
trace.c iommu/vt-d: Move trace/events/intel_iommu.h under iommu 2022-07-15 10:21:28 +02:00
trace.h iommu/vt-d: Deduplicate cache_tag_flush_all by reusing flush_range 2025-07-14 11:18:04 +01:00