36 строки
1.5 KiB
Plaintext
36 строки
1.5 KiB
Plaintext
What: /sys/kernel/iommu_groups/
|
|
Date: May 2012
|
|
KernelVersion: v3.5
|
|
Contact: Alex Williamson <alex.williamson@redhat.com>
|
|
Description: /sys/kernel/iommu_groups/ contains a number of sub-
|
|
directories, each representing an IOMMU group. The
|
|
name of the sub-directory matches the iommu_group_id()
|
|
for the group, which is an integer value. Within each
|
|
subdirectory is another directory named "devices" with
|
|
links to the sysfs devices contained in this group.
|
|
The group directory also optionally contains a "name"
|
|
file if the IOMMU driver has chosen to register a more
|
|
common name for the group.
|
|
Users:
|
|
|
|
What: /sys/kernel/iommu_groups/reserved_regions
|
|
Date: January 2017
|
|
KernelVersion: v4.11
|
|
Contact: Eric Auger <eric.auger@redhat.com>
|
|
Description: /sys/kernel/iommu_groups/reserved_regions list IOVA
|
|
regions that are reserved. Not necessarily all
|
|
reserved regions are listed. This is typically used to
|
|
output direct-mapped, MSI, non mappable regions. Each
|
|
region is described on a single line: the 1st field is
|
|
the base IOVA, the second is the end IOVA and the third
|
|
field describes the type of the region.
|
|
|
|
What: /sys/kernel/iommu_groups/reserved_regions
|
|
Date: June 2019
|
|
KernelVersion: v5.3
|
|
Contact: Eric Auger <eric.auger@redhat.com>
|
|
Description: In case an RMRR is used only by graphics or USB devices
|
|
it is now exposed as "direct-relaxable" instead of "direct".
|
|
In device assignment use case, for instance, those RMRR
|
|
are considered to be relaxable and safe.
|