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== Comment: #0 - Leonardo Augusto Guimaraes Garcia <> - 
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: linux (Ubuntu)
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New

** Tags: architecture-ppc64le bugnameltc-157038 severity-high 
Support for multiple PHBs in pseries virtual machines
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