Now that the 2.8 tree is open, I'd like to resurrect this earlier patch
to switch the macio controller over to the new byte-aligned DMA helpers:
https://lists.gnu.org/archive/html/qemu-devel/2016-05/msg04907.html.
The first patch in the series is a hack to work around the issue that
byte-aligned qiovs are being truncated with the existing code. git blame
shows that this code was introduced by this commit:
commit 58f423fbd5f7f435e8dc56dfa565b043d20d1e1b
Author: Kevin Wolf <kw...@redhat.com>
Date: Wed Jul 9 19:17:30 2014 +0200
dma-helpers: Fix too long qiov
If the size of the scatter/gather list isn't a multiple of 512, the
number of sectors for the block layer request is rounded down, resulting
in a qiov that doesn't match the request length. Truncate the qiov
to the
new length of the request.
This fixes the IDE qtest case /x86_64/ide/bmdma/short_prdt.
Signed-off-by: Kevin Wolf <kw...@redhat.com>
Reviewed-by: Eric Blake <ebl...@redhat.com>
Kevin/Paolo - what should be the correct behaviour here given that the
underlying APIs are now byte-aligned?
ATB,
Mark.
