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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1911205
and then change the status of the bug to 'Confirmed'.
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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1911205
Title:
Revert or drop obsolete patches for PCI
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Focal:
In Progress
Status in linux source package in Groovy:
In Progress
Bug description:
[Impact]
In both 5.4 and 5.8 kernel, there are two patches in PCI to workaround
an issue with GPU and Infiniband at the time. Those two patches are no
longer necessary in today's Azure environment. Those two patches
introduces bugs to the latest Azure HPC VM SKU.
4.15 kernel is not affected.
Microsoft has regression tested and verified that the following two
patches can be dropped or reverted in 5.4 and 5.8.
5.4 kernel:
Patch 1: Revert "PCI: hv: Make sure the bus domain is really unique"
https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-azure/+git/bionic/commit/drivers/pci/controller/pci-hyperv.c?h=azure-5.4&id=faf2750396d60001046333bd46eee757bb4cac7b
Patch 2: UBUNTU: SAUCE: pci-hyperv: Use only 16 bit integer for PCI domain
https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-azure/+git/bionic/commit/drivers/pci/controller/pci-hyperv.c?h=azure-5.4&id=04ac3e06ab708131c1c18cb7db10ca5dd6feedce
5.8 kernel:
Patch 1: Revert "PCI: hv: Make sure the bus domain is really unique"
https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-azure/+git/groovy/commit/drivers/pci/controller/pci-hyperv.c?h=Ubuntu-azure-5.8.0-1016.17&id=7c85402203e26d4d0474f69b99b5a06ffb765630
Patch 2: UBUNTU: SAUCE: pci-hyperv: Use only 16 bit integer for PCI domain
https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-azure/+git/groovy/commit/drivers/pci/controller/pci-hyperv.c?h=Ubuntu-azure-5.8.0-1016.17&id=b72f314d15ab0ad7b80b761d8167962300c1bd35
[Test Case]
As per #1816106, instances with multiple GPUs should still be able to
see all of them.
[Where problems could occur]
Issues or oops in instances types with multiple GPUs.
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