Public bug reported: Host changes have altered how the PCI GUID is presented to the guest and the patches for PCI IDs in 4.15.0-1037 do not properly handle the new condition.
Impact: Instances with multiple GPUs are only seeing one. Workaround: 4.15.0-1036 does not have this behavior. Additional info: The commit in 4.15.0-1037 responsible is " - PCI: hv: Make sure the bus domain is really unique" The immediate action requested is to back out this patch on 4.15.0 (azure): https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-azure/commit/?h=master-next&id=b9ae54076a78d01659c4d0f0a558cdb4056f0d13 The same thing on 4.18: https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-azure/commit/?h=azure-edge-next&id=29927dfb7f69bcf2ae7fd1cda10997e646a5189c ** Affects: linux-azure (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-azure in Ubuntu. https://bugs.launchpad.net/bugs/1816106 Title: 4.15.0-1037 does not see all PCI devices on GPU VMs Status in linux-azure package in Ubuntu: New Bug description: Host changes have altered how the PCI GUID is presented to the guest and the patches for PCI IDs in 4.15.0-1037 do not properly handle the new condition. Impact: Instances with multiple GPUs are only seeing one. Workaround: 4.15.0-1036 does not have this behavior. Additional info: The commit in 4.15.0-1037 responsible is " - PCI: hv: Make sure the bus domain is really unique" The immediate action requested is to back out this patch on 4.15.0 (azure): https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-azure/commit/?h=master-next&id=b9ae54076a78d01659c4d0f0a558cdb4056f0d13 The same thing on 4.18: https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-azure/commit/?h=azure-edge-next&id=29927dfb7f69bcf2ae7fd1cda10997e646a5189c To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1816106/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp