[Qemu-devel] [PATCH 0/7] s390x/pci: Improve zPCI to cover more cases

[Pierre Morel <pmorel@linux.vnet.ibm.com>]

Right now the PCI support is very limited (e.g. pass through of a
host vfio device)
To enable features like virtio-pci several modifications needs to be
done.

Virtio-PCI uses subregions, which may eventually be discontinuous
inside bars instead of a single flat region.
The address offset being formerly calculated from the BAR base address
must be adapted to the subregions instead of to the single region.

This patch provides the new calculation for the three kind of BAR
access, zPCI STORE, zPCI LOAD and zPCI STORE BLOCK.

We use the opportunity to
 - enhance the fault detection for zPCI STORE and LOAD,
 - enhance the fault detection and to provide the maximum STORE BLOCK
   block size, maxstbl, for zPCI STORE BLOCK
 - factor out part of the code used to calculate the offset and
   access the BARs,
 - factor out the code for endianess conversion.


Pierre Morel (7):
  s390x/pci: factor out endianess conversion
  s390x/pci: rework PCI STORE
  s390x/pci: rework PCI LOAD
  s390x/pci: rework PCI STORE BLOCK
  s390x/pci: move the memory region read from pcilg
  s390x/pci: move the memory region write from pcistg
  s390x/pci: search for subregion inside the BARs

 hw/s390x/s390-pci-bus.h  |   1 +
 hw/s390x/s390-pci-inst.c | 250 ++++++++++++++++++++++++++++-------------------
 hw/s390x/s390-pci-inst.h |   2 +-
 3 files changed, 153 insertions(+), 100 deletions(-)

-- 
2.7.4