Re: [Qemu-devel] [PATCH] ivshmem: Store file descriptor for vhost-user negotiation

[Markus Armbruster]

Marc-André Lureau <address@hidden> writes:

> Hi
>
> On Fri, Dec 4, 2015 at 3:55 PM, Tetsuya Mukawa <address@hidden> wrote:
>>> What's the use case or test case?
>>
>> One of example is userspace device driver like DPDK PMD.
>> Actually, I've found this fd related behavior using DPDK virtio-net PMD.
>> Could you please check below to know my use case more?
>> http://thread.gmane.org/gmane.comp.networking.dpdk.devel/28467/focus=28493
>
> Thanks. Why not use memory-backend-file with share=on ? I think I
> understand you want to use the same BAR address as the host shared
> memory location to avoid extra offset computation. I don't know about
> the limitations here. Is this extra offset really worth saving?
> Finally, I wonder what qemu is really doing in the end ;)

Tetsuya, I still don't understand what you're trying to accomplish.

I concur with Marc-André that -object memory-backend-FOO is how we
allocate a memory object for something else to use.

> Michael, could you comment about this vhost-user use case? (see above
> linked thread)