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Description of problem:

In the current qemu code, IBM's EEH (Enhanced Error Handling) functionality is only available for VFIO passthrough devices placed on the special spapr-pci-vfio-host-bridge.

That doesn't work well with current libvirt and RHEV, because they generally use use the plain spapr-pci-host-bridge device in the guest.

Version-Release number of selected component (if applicable):

qemu-kvm-rhev-2.3.0-24.el7.ppc64le

How reproducible:

100%

Steps to Reproduce:
1. Create a pseries VM with a VFIO device attached to an spapr-pci-host-bridge PHB.
2. Boot the guest
3. Attempt EEH actions on the passed through device

Actual results:

EEH actions will fail with RTAS errors

Expected results:

EEH operations complete successfully.

Additional info:

I'm not really sure if this meets the criteria for a blocker bug, but I'm filing it that way, because I think it should at least be assessed.

I have posted upstream patches to address this (though they're minimally tested and not merged).

I've made a preliminary downstream port at:
    git://git.engineering.redhat.com/~dgibson/qemu.git
    branch 'rhel7/bz1264728'

Test build of same at http://brewweb.devel.redhat.com/brew/taskinfo?taskID=9858641

Decision has been made not to try to rush to get EEH fully working in RHEL7.2.

Bumping to RHEL7.3.

Moving back to assigned state, since the posted patches will need a respin anyway.

I've now posted a reworked upstream series for this as RFC.

Hi David, is it possible that spapr-pci-vfio-host-bridge will be abandoned in future? and all the functions and devices will be implemented on  spapr-pci-host-bridge?

Zhengtong,

Yes, that is my intention.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2673.html