Re: [PATCH v4 0/4] block: fix detect-zeroes= with BDRV_REQ_REGISTERED_BUF

[Stefan Hajnoczi <stefanha@redhat.com>]

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On Tue, Feb 07, 2023 at 03:37:15PM -0500, Stefan Hajnoczi wrote:
> v4:
> - Add 'r' to read_f() getopt() call [Hanna]
> - Fix qemu_io_alloc() and friends buf and len with qemuio_misalign [Hanna]
> - Fix qemu_iovec_destroy()/qemu_io_free() ordering in aio_write_done() [Hanna]
> - Add mutually exclusive -z -r option check in aio_write_f() [Hanna]
> v3:
> - Restore alphabetical order in getopt strings [Eric]
> v2:
> - Add comment explaining unbalanced error code path in
>   qemu_io_alloc_from_file() [Eric]
> - List options alphabetically in help output [Eric]
> - Add Tested-by/Reviewed-by
> - CC qemu-stable on the fix
> 
> The first patch fixes a regression in QEMU 7.2 where detect-zeroes breaks with
> virtio-blk devices due to a BDRV_REQ_REGISTERED_BUF bug. Details of the
> regression can be found here:
> https://gitlab.com/qemu-project/qemu/-/issues/1404
> 
> The remaining patches add a regression test that will protect this code path in
> the future. The qemu-io command is extended with the new -r option that calls
> blk_register_buf(). This allows a qemu-iotests test case to trigger the same
> bug as virtio-blk.
> 
> Stefan Hajnoczi (4):
>   block: fix detect-zeroes= with BDRV_REQ_REGISTERED_BUF
>   qemu-io: use BdrvRequestFlags instead of int
>   qemu-io: add -r option to register I/O buffer
>   iotests/detect-zeroes-registered-buf: add new test
> 
>  block/io.c                                    |   3 +
>  qemu-io-cmds.c                                | 215 +++++++++++-------
>  .../tests/detect-zeroes-registered-buf        |  58 +++++
>  .../tests/detect-zeroes-registered-buf.out    |   7 +
>  4 files changed, 203 insertions(+), 80 deletions(-)
>  create mode 100755 tests/qemu-iotests/tests/detect-zeroes-registered-buf
>  create mode 100644 tests/qemu-iotests/tests/detect-zeroes-registered-buf.out
> 
> -- 
> 2.39.1
> 

Thanks, applied to my block tree:
https://gitlab.com/stefanha/qemu/commits/block

Stefan

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