4.15.0-1037 does not see all PCI devices on GPU VMs

[David Coronel]

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

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-azure - 4.18.0-1011.11

---------------
linux-azure (4.18.0-1011.11) cosmic; urgency=medium

  * linux-azure: 4.18.0-1011.11 -proposed tracker (LP: #1816081)

  * 4.15.0-1037 does not see all PCI devices on GPU VMs (LP: #1816106)
    - Revert "PCI: hv: Make sure the bus domain is really unique"

linux-azure (4.18.0-1009.9) cosmic; urgency=medium

  * Allow I/O schedulers to be loaded with modprobe in linux-azure
    (LP: #1813211)
    - [Config] linux-azure: Enable all IO schedulers as modules

  * [Hyper-V] srcu: Lock srcu_data structure in srcu_gp_start() (LP: #1802021)
    - srcu: Lock srcu_data structure in srcu_gp_start()

  * CONFIG_SECURITY_SELINUX_DISABLE should be disabled on 4.15/4.18 Azure
    (LP: #1813866)
    - [Config]: disable CONFIG_SECURITY_SELINUX_DISABLE

  [ Ubuntu: 4.18.0-15.16 ]

  * Ubuntu boot failure. 4.18.0-14 boot stalls. (does not boot) (LP: #1814555)
    - Revert "drm/i915/ringbuffer: Delay after EMIT_INVALIDATE for gen4/gen5"
  * Userspace break as a result of missing patch backport (LP: #1813873)
    - tty: Don't hold ldisc lock in tty_reopen() if ldisc present

 -- Stefan Bader <email address hidden> Fri, 15 Feb 2019 17:16:24 +0100

[Marcelo Cerri (mhcerri)]

4.18 also needs the fix for http://bugs.launchpad.net/bugs/1684971