[Qemu-devel] [PATCH v16 0/2] EEH Support for VFIO Devices

[Gavin Shan]

The series of patches adds support EEH for VFIO PCI devices on sPAPR platform.
It requires corresponding host kernel support, which was merged during 3.17
merge window. This patchset has been rebased to Alex Graf's QEMU repository:

   git://github.com/agraf/qemu.git (branch: ppc-next)

The implementations notes are below. Please consider for merging!

* RTAS calls are received in spapr_pci.c, sanity check is done there. RTAS
  handlers handle what they can. If there is something it cannot handle and
  sPAPRPHBClass::eeh_handler callback is defined, it is called.
* sPAPRPHBClass::eeh_handler is only implemented for VFIO now. It does ioctl()
  to the IOMMU container fd to complete the call. Error codes from that ioctl()
  are transferred back to the guest.

Changelog
=========
v12 -> v13:
    * Rebase to Alex Graf's QEMU repository ("ppc-next" branch).
    * Drop the patch for header file (vfio.h) changes, which was merged
      to QEMU repository by commit a9fd1654 ("linux-headers: update to 
3.17-rc7").
    * Retested on Emulex adapter and EEH errors are recovered successfully.
v13 -> v14:
    * Check if sPAPRPHBState instance is valid before converting it to the
      corresponding class as pointed by Alex Graf.
v14 -> v15:
    * Dropped unrelated patch making find_phb()/find_dev() public.
    * Checking RTAS parameter number before accessing RTAS parameter buffer for
      more safety.
    * Return hardware error from RTAS call "ibm,set-eeh-option" and 
"ibm,set-slot-reset"
      for some cases according to PAPR spec.
v15 -> v16:
    * Drop rtas_handle_eeh_request() and merge the logic to its callers so that
      more accurate return values can be returned for RTAS calls in the callers
    * Always return 1 ("No error log") for RTAS call "ibm,slot-error-detail" and
      correct wrong return values for other RTAS calls according to David 
Gibson's
      suggestions.
    * Make fall-through more obvious for case of negative return value from
      sPAPRPHBClass::eeh_handler()
    * Clear the argument buffer passed to ioctl()
    * Rename sPAPRPHBClass variable from "info" to "spc"

Gavin Shan (2):
  sPAPR: Implement EEH RTAS calls
  sPAPR: Implement sPAPRPHBClass::eeh_handler

 hw/ppc/spapr_pci.c          | 310 ++++++++++++++++++++++++++++++++++++++++++++
 hw/ppc/spapr_pci_vfio.c     |  58 +++++++++
 hw/vfio/common.c            |   1 +
 include/hw/pci-host/spapr.h |   7 +
 include/hw/ppc/spapr.h      |  43 +++++-
 5 files changed, 417 insertions(+), 2 deletions(-)

-- 
1.8.3.2