Re: [Qemu-devel] [PATCH] block: Introduce "null" driver

[Markus Armbruster]

Eric Blake <address@hidden> writes:

> On 08/27/2014 12:22 AM, Fam Zheng wrote:
>> This is an analogue to Linux null_blk. It can be used for testing block
>> device emulation and general block layer functionalities such as
>> coroutines and throttling, where disk IO is not necessary or wanted.
>> 
>> Signed-off-by: Fam Zheng <address@hidden>
>> ---
>>  block/Makefile.objs |   1 +
>>  block/null.c | 172
>> ++++++++++++++++++++++++++++++++++++++++++++++++++++
>>  2 files changed, 173 insertions(+)
>>  create mode 100644 block/null.c
>
> Worth also adding it to BlockdevOptions in qapi/block-core.json to allow
> hotplug of this driver?  (Not that libvirt will ever hotplug one, but I
> really want to move towards being feature-complete on letting QMP drive
> all block types)

I'd support a policy of "no new block drivers outside QAPI".