Public bug reported:
SRU Justification
[Impact]
Upstream commit 0b7cfa4082fbf550595bc0e40f05614bd83bf0cd is a fix to the
Mellanox mlx5 driver that we would like to have you pick up. It fixes a
bug that was introduced in the 4.7 kernel, so it should be applicable to
pretty much every Linux distribution.
The bug causes a Linux panic when a Mellanox CX-4 VF is present in the
VM (for AccelNet) and swiotlb=force used on the kernel boot line.
swiotlb=force would not normally be used, which is why we haven’t seen
the problem reported previously, but it cropped up during some internal
testing. We are trying to head off a potential problem in a future
scenario for Confidential VMs.
Primarily we want to ensure that any CVMs images have this fix, as we don’t
want CVM images to exist in the wild that would fail in the future when CVMs
with AccelNet are offered.
Business Impact
This scenario could also exist in non-Azure instances.
[Test Case]
Microsoft tested.
[Where problems could appear]
Weird DMA and data corruption issues might crop up.
[Other Info]
SF: #00328938
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Fix Released
** Affects: linux (Ubuntu Focal)
Importance: Medium
Assignee: Tim Gardner (timg-tpi)
Status: In Progress
** Affects: linux (Ubuntu Impish)
Importance: Undecided
Status: Fix Released
** Affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: Fix Released
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Focal)
Status: New => In Progress
** Changed in: linux (Ubuntu Focal)
Assignee: (unassigned) => Tim Gardner (timg-tpi)
** Changed in: linux (Ubuntu Focal)
Importance: Undecided => Medium
** Also affects: linux (Ubuntu Impish)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Impish)
Status: New => Fix Released
** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Jammy)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1967292
Title:
net/mlx5e: Fix page DMA map/unmap attributes
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Focal:
In Progress
Status in linux source package in Impish:
Fix Released
Status in linux source package in Jammy:
Fix Released
Bug description:
SRU Justification
[Impact]
Upstream commit 0b7cfa4082fbf550595bc0e40f05614bd83bf0cd is a fix to
the Mellanox mlx5 driver that we would like to have you pick up. It
fixes a bug that was introduced in the 4.7 kernel, so it should be
applicable to pretty much every Linux distribution.
The bug causes a Linux panic when a Mellanox CX-4 VF is present in the
VM (for AccelNet) and swiotlb=force used on the kernel boot line.
swiotlb=force would not normally be used, which is why we haven’t seen
the problem reported previously, but it cropped up during some
internal testing. We are trying to head off a potential problem in a
future scenario for Confidential VMs.
Primarily we want to ensure that any CVMs images have this fix, as we don’t
want CVM images to exist in the wild that would fail in the future when CVMs
with AccelNet are offered.
Business Impact
This scenario could also exist in non-Azure instances.
[Test Case]
Microsoft tested.
[Where problems could appear]
Weird DMA and data corruption issues might crop up.
[Other Info]
SF: #00328938
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1967292/+subscriptions
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