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[Bug 1816106] Re: 4.15.0-1037 does not see all PCI devices on GPU VMs

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Marcelo Cerri <1816106@xxxxxxxxxxxxxxxxxx>
Date: Wed, 27 Feb 2019 20:06:30 -0000
Reply-to: Bug 1816106 <1816106@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Also affects: linux-azure (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

** Also affects: linux-azure (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** No longer affects: linux-azure (Ubuntu Bionic)

** Also affects: linux-azure (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux-azure (Ubuntu Xenial)
       Status: New => Fix Released

** Changed in: linux-azure (Ubuntu Cosmic)
       Status: New => Fix Released

** Changed in: linux-azure (Ubuntu Xenial)
     Assignee: (unassigned) => Marcelo Cerri (mhcerri)

** Changed in: linux-azure (Ubuntu Cosmic)
     Assignee: (unassigned) => Marcelo Cerri (mhcerri)

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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:
  Fix Released
Status in linux-azure source package in Xenial:
  Fix Released
Status in linux-azure source package in Cosmic:
  Fix Released

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

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