[Qemu-devel] [PATCH 0/4] Fix the lazy CFI mode switch

[Jan Kiszka <jan.kiszka@web.de>]

This series addresses the major problem lazy mode switching of the
pflash_cfi02 currently has: code execution from this ROM can fail.

The reason for this was a conceptual issue that was papered over by a
bug in the original implementation. Both are addressed here by
 - allowing code execution from marked I/O memory regions (specifically
   ROM devices)
 - performing the lazy switch back of cfi02 from reprogramming to ROM
   mode via a timer

To recall why this effort is needed: Programming 7 MB of an 8 MB flash
that does not support the unlock bypass command takes 5:40 minutes with
this optimization and about 3 h (estimated, it became boring to wait for
completion) without it.

Jan Kiszka (4):
  cfi02: Fix a debug print
  Add support for execution from ROMs in IO device mode
  cfi: Mark flash memory executable
  cfi02: Use timer-based ROM mode switch

 cpu-common.h      |    2 ++
 exec-all.h        |    2 +-
 exec.c            |    2 +-
 hw/pflash_cfi01.c |    9 +++++----
 hw/pflash_cfi02.c |   46 ++++++++++++++++++++++++++++++++++------------
 5 files changed, 43 insertions(+), 18 deletions(-)