[Lguest] Communication between host and guest

[Rusty Russell]

Earlence Fernandes <earlenceferns at gmail.com> writes:

> Yep. I was grepping thru the sources.
>
> I think the best way would be to create a virtio device coupled with a
> hypercall to return data (which is typically one value).
>
> Of course, I was thinking, what if I simply did a write() to lguest_fd and
> pull that in the read loop in the guest...

That's going to be less efficient than just using a virtio ring
with a writable part in the descriptor for the reply (this is what
virtio-blk does for a write, for example).

Cheers,
Rusty.