Re: [Qemu-devel] If Qemu support NVMe over Fabrics ?y

[Paolo Bonzini]

On 11/01/19 06:46, Yang Zhong wrote:
> On Thu, Jan 10, 2019 at 10:36:37AM +0000, Stefan Hajnoczi wrote:
>> On Thu, Jan 10, 2019 at 04:37:53PM +0800, Yang Zhong wrote:
>>> Do you know if Qemu support NVMe over Fabrics(NVMe-oF)?
>>> https://nvmexpress.org/wp-content/uploads/NVMe_Over_Fabrics.pdf
>>>
>>> The Qemu has enabled RDMA in last year, and i am not sure if Qemu 
>>> should support NVME-oF. If Qemu support it, would you please share
>>> me the qemu related command or guides? thanks a lot!
>>
>> QEMU supports many different storage configurations.  Can you be more
>> specific?
>>
>> For example, if your host has NVMe-oF set up then you can give the NVMe
>> block devices to QEMU just like any other host block device (-drive
>> file=/dev/sdc,...).
>>
>> But maybe you are thinking about other configurations, like exposing
>> NVMe-oF to the guest?
>>
>   Thanks Stefan's comments. We only want Qemu as NVMe-oF initiator to
>   access remote target's resource.
> 
>   I checked the block/nvme.c and hw/block/nvme.c code, which seems do
>   not support NVMe-oF . If i am wrong please correct me.
> 
>   If Qemu support NVMe-oF initiator, please share me how to use it. 
>   If Qemu does not support it, please tell me if community has plan 
>   to implement it. thanks a lot!

QEMU's native NVMe driver only supports NVMe over PCI, but it should be
possible to extract common code if you want to add a native NVMe over
RDMA driver to QEMU.  There are currently no plans to add such a driver,
but it would certainly be a welcome addition.

Paolo