On Thu, Apr 17, 2025 at 01:39:16PM -0500, Eric Blake wrote: > QEMU's attempts to learn whether a destination file starts life with > all zero contents are just a heuristic. There may be cases where the > caller is aware of information that QEMU cannot learn quickly, in > which case telling QEMU what to assume about the destination can make > the mirror operation faster. Given our existing example of "qemu-img > convert --target-is-zero", it is time to expose this override in QMP > for blockdev-mirror as well. > > Signed-off-by: Eric Blake <ebl...@redhat.com> > --- > qapi/block-core.json | 8 +++++++- > include/block/block_int-global-state.h | 3 ++- > block/mirror.c | 23 +++++++++++++++-------- > blockdev.c | 18 +++++++++++------- > tests/unit/test-block-iothread.c | 2 +- > 5 files changed, 36 insertions(+), 18 deletions(-)
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
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