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
> ---
> 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
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