-drive id=drv,if=none,file="$TEST_IMG",driver=raw,file.driver=$IMGFMT \
| _filter_qmp | _filter_qemu_io
$QEMU_IO -c 'read -P 42 0 64k' "$TEST_IMG" | _filter_qemu_io
-drive id=drv,if=none,file="$TEST_IMG",driver=raw,file.driver=$IMGFMT \
| _filter_qmp | _filter_qemu_io
$QEMU_IO -c 'read -P 42 0 64k' "$TEST_IMG" | _filter_qemu_io