[0/2] hw/pflash: implement update buffer for block writes

Message

Gerd Hoffmann Jan. 5, 2024, 1:58 p.m. UTC

When running qemu with edk2 efi firmware on aarch64 the efi
variable store in pflash can get corrupted.  qemu not doing
proper block writes -- flush all or nothing to storage -- is
a hot candidate for being the root cause.

This little series tries to fix that with an update buffer
where block writes are staged, so we can commit or discard
the changes when the block write is completed or canceled.

Gerd Hoffmann (2):
  hw/pflash: refactor pflash_data_write()
  hw/pflash: implement update buffer for block writes

 hw/block/pflash_cfi01.c | 132 ++++++++++++++++++++++++++++------------
 1 file changed, 93 insertions(+), 39 deletions(-)