** Also affects: ubuntu-power-systems
   Importance: Undecided
       Status: New

** Changed in: ubuntu-power-systems
     Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)

** Changed in: ubuntu-power-systems
   Importance: Undecided => High

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  Support for multiple PHBs in pseries virtual machines

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

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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