[PATCH v3 00/10] q800: migration fixes

[Mark Cave-Ayland]

This patchset contains fixes for the macfb and esp devices which enable
migration of the q800 machine to succeed here in local testing.

Patches 1-5 contain fixes and improvements for migrating the macfb device
whilst patches 6-9 change the ESPState pdma_cb field from being a
function pointer to an integer index that can be included in the migration
stream.

Finally patch 10 ensures that any in-flight SCSI requests active during
migration are resumed correctly post-migration. This is required because
PDMA requires the guest to read/write DMA data and hence an active
SCSI request cannot run to completion before migration starts.

NOTE: this patchset is based upon my previous mos6522 patchset posted at
https://lists.gnu.org/archive/html/qemu-devel/2022-03/msg01641.html.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Based-on: <20220305150957.5053-1-mark.cave-ayland@ilande.co.uk>

v3:
- Add R-B tags from Peter
- Add paragraph to commit messages in patches 3 and 4 indicating why we don't
  care about the migration break
- Add comment in patch 9 explaining the logic around esp_pdma_is_needed()
- Add R-B tags from Laurent

v2:
- Rebase onto master
- Add R-B tags from Phil
- Update patch 8 to use an unsigned type for pdma_cb along with an enum
- Squash fixes into patch 3 (missing default in switch)


Mark Cave-Ayland (10):
  macfb: add VMStateDescription for MacfbNubusState and MacfbSysBusState
  macfb: don't use special irq_state and irq_mask variables in
    MacfbState
  macfb: increase number of registers saved in MacfbState
  macfb: add VMStateDescription fields for display type and VBL timer
  macfb: set initial value of mode control registers in
    macfb_common_realize()
  esp: introduce esp_set_pdma_cb() function
  esp: introduce esp_pdma_cb() function
  esp: convert ESPState pdma_cb from a function pointer to an integer
  esp: include the current PDMA callback in the migration stream
  esp: recreate ESPState current_req after migration

 hw/display/macfb.c         | 57 ++++++++++++++++++++-----
 hw/scsi/esp.c              | 87 ++++++++++++++++++++++++++++++++++----
 include/hw/display/macfb.h |  5 +--
 include/hw/scsi/esp.h      | 11 ++++-
 4 files changed, 137 insertions(+), 23 deletions(-)

-- 
2.20.1