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Logical and physical block sizes in QEMU are limited to 32 KiB. This appears unnecessarily tight, and we've seen bigger block sizes handy at times. Lift the limitation up to 2 MiB which appears to be good enough for everybody, and matches the qcow2 cluster size limit. Signed-off-by: Roman Kagan <rvkagan@yandex-team.ru> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20200528225516.1676602-9-rvkagan@yandex-team.ru> Signed-off-by: Kevin Wolf <kwolf@redhat.com>