Public bug reported:

== Comment: #0 - Leonardo Augusto Guimaraes Garcia <lagar...@br.ibm.com> - 
2017-07-27 13:24:28 ==
Power servers can have multiple PCI Host Bridges (PHBs), different from x86, 
where it is rare to have multiple PHBs.

Multiple PHBs are important on Power virtual machines because it allows
EEH to work correctly for multiple devices. If a virtual machine has
only one vPHB and an EEH occurs to an adapter passed through to the
virtual machine and attached to that vPHB, all other adapters connected
to the same vPHB will be reset because of the EEH recovery routine.

With multiple vPHBs we can attach one device per PHB and EEH will work
independently without problems for each adapter.

This feature has already been integrated upstream and will be available
with libvirt 3.6.0.

QEMU already allows multiple PHBs. This feature is to add this support
into libvirt.

** Affects: ubuntu-power-systems
     Importance: High
     Assignee: Canonical Kernel Team (canonical-kernel-team)
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New


** Tags: architecture-ppc64le bugnameltc-157038 severity-high 
targetmilestone-inin1710

** Tags added: architecture-ppc64le bugnameltc-157038 severity-high
targetmilestone-inin1710

** Changed in: ubuntu
     Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage 
(ubuntu-power-triage)

** Package changed: ubuntu => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1709894

Title:
  Support for multiple PHBs in pseries virtual machines

Status in The Ubuntu-power-systems project:
  New
Status in linux package in Ubuntu:
  New

Bug description:
  == Comment: #0 - Leonardo Augusto Guimaraes Garcia <lagar...@br.ibm.com> - 
2017-07-27 13:24:28 ==
  Power servers can have multiple PCI Host Bridges (PHBs), different from x86, 
where it is rare to have multiple PHBs.

  Multiple PHBs are important on Power virtual machines because it
  allows EEH to work correctly for multiple devices. If a virtual
  machine has only one vPHB and an EEH occurs to an adapter passed
  through to the virtual machine and attached to that vPHB, all other
  adapters connected to the same vPHB will be reset because of the EEH
  recovery routine.

  With multiple vPHBs we can attach one device per PHB and EEH will work
  independently without problems for each adapter.

  This feature has already been integrated upstream and will be
  available with libvirt 3.6.0.

  QEMU already allows multiple PHBs. This feature is to add this support
  into libvirt.

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https://bugs.launchpad.net/ubuntu-power-systems/+bug/1709894/+subscriptions

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