** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Cosmic)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Disco)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1823037
Title:
amd_iommu possible data corruption
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
Fix Committed
Status in linux source package in Cosmic:
Fix Committed
Status in linux source package in Disco:
Fix Committed
Bug description:
[Impact]
If a device has an exclusion range specified in the IVRS
table, this region needs to be reserved in the iova-domain
of that device. This hasn't happened until now and can cause
data corruption on data transfered with these devices.
The exlcusion range limit register needs to contain the
base-address of the last page that is part of the range, as
bits 0-11 of this register are treated as 0xfff by the
hardware for comparisons.
So correctly set the exclusion range in the hardware to the
last page which is _in_ the range.
[Fixes]
Cherry pick the following from Mainline
fd3b3448cf5adc2a2f09b70eaad03c27fe79e7a6 iommu/amd: Reserve exclusion range
in iova-domain
3c677d206210f53a4be972211066c0f1cd47fe12 iommu/amd: Set exclusion range
correctly
These can be picked from my branches here:
Bionic:
https://code.launchpad.net/~bladernr/ubuntu/+source/linux/+git/bionic
1823037-amd_iommu-cherrypick
b7abdb585d0ae4193add1f7038476cd8d6dd7f41 iommu/amd: Reserve exclusion range
in iova-domain
ee4a87e6b7fe7e039c1f02c50c53da63e4270732 iommu/amd: Set exclusion range
correctly
Cosmic: https://code.launchpad.net/~bladernr/ubuntu/+source/linux/+git/cosmic
1823037-amd_iommu-cherrypick
0acc8c0e862b46b12c233abd76593420f4a20e0c iommu/amd: Reserve exclusion range
in iova-domain
fbead5d71bfc2a49ffca8d181e2708fd616e9a7f iommu/amd: Set exclusion range
correctly
Disco:
https://code.launchpad.net/~bladernr/ubuntu/+source/linux/+git/disco
1823037-amd_iommu-cherrypick
6ddc207ca0d442b413ea7f059937ba90e5139753 iommu/amd: Set exclusion range
correctly
Note Disco only required f1cd47fe12 as the first patch was already
picked in LP: #1830934
Not necessary for Eoan as these are already upstream in 5.2-rc1
[Regression Risk]
Low,this adds memory protection to the driver and has already been applied
upstream and tested by Dell for 24 hours with no failures noted.
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