[Qemu-devel] [PATCH v19 0/2] EEH Support for VFIO Devices

[Gavin Shan <gwshan@linux.vnet.ibm.com>]

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 callback is defined, it is called.
* sPAPRPHBClass EEH callbacks are 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
=========
v18 -> v19:
    * Check the validity of PCI device address in sPAPRPHBClass::eeh_set_option()
      when enabling EEH functionality.
v17 -> v18:
    * Check options in sPAPRPHBClass callbacks for RTAS call "ibm,set-eeh-option"
      and "ibm,set-slot-reset".
    * Return RTAS_OUT_PARAM_ERROR on errors and RTAS_OUT_NO_ERRORS_FOUND on success
      as we don't have error log yet.
v16 -> v17:
    * Split sPAPRPHBClass::eeh_handler() to multiple callbacks according to David
      Gibson's suggestion
    * Make comments for the form of PE address more precise and merge the condition
      checking on the option in rtas_ibm_get_config_addr_info2() to improve code
      readability
    * Return RTAS_OUT_PARAM_ERROR for invalid number of arguments to function
      rtas_ibm_slot_error_detail(), which is inconsistent with 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"
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.
v13 -> v14:
    * Check if sPAPRPHBState instance is valid before converting it to the
      corresponding class as pointed by Alex Graf.
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.

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

 hw/ppc/spapr_pci.c          | 271 ++++++++++++++++++++++++++++++++++++++++++++
 hw/ppc/spapr_pci_vfio.c     | 115 +++++++++++++++++++
 hw/vfio/common.c            |   1 +
 include/hw/pci-host/spapr.h |   4 +
 include/hw/ppc/spapr.h      |  43 ++++++-
 5 files changed, 432 insertions(+), 2 deletions(-)

-- 
1.8.3.2