[Qemu-devel] [block PATCH v2 0/3] AHCI device fixes

[John Snow <jsnow@redhat.com>]

This is a v2 patch series that collects patches 3, 4 and 5
from the v1 series that was only partially merged.

This series, as a subset, generally cleans up the usage and
handling of the scatter-gather list implementation in QEMU
that interacts with the PRDT (Physical Region Descriptor Table)
in AHCI.

We also repair a small oversight with PIO transfers.

This series currently applies cleanly to stefanha's block staging
tree, but can be trivially merged to master.

v2:
- Reset io_buffer_offset to 0 at the beginning of ide_exec_cmd,
  which will reset it for PIO I/O and all ATAPI commands.
  There was an oversight in V1 where we would use junk values for
  PACKET IDENTIFY if it was not the first command.

- Adjust the prepare_buf() callback to return, simply, the number
  of bytes it was able to prepare, or -1 on error. This resolves
  an ambiguity around the nature of its return code meaning
  "no sectors" or "no bytes" which led to bad error pathways.

John Snow (3):
  ide: repair PIO transfers for cases where nsector > 1
  ahci: unify sglist preparation
  ide: Correct handling of malformed/short PRDTs

 hw/ide/ahci.c     | 33 ++++++++++++++++++++++++++-------
 hw/ide/core.c     | 14 ++++++++++++--
 hw/ide/internal.h | 13 +++++++------
 hw/ide/macio.c    |  7 ++++++-
 hw/ide/pci.c      | 27 +++++++++++++++++++++------
 5 files changed, 72 insertions(+), 22 deletions(-)

-- 
1.9.3