Re: [Xen-devel] [RFC][PATCH 0/5] Add V4V to Xen

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2012-05-31 at 16:07 +0100, Jean Guyader wrote:
> V4V is a copy based inter vm communication system.
> 
> Please have a look at this thread for more detail
> about V4V.
> http://lists.xen.org/archives/html/xen-devel/2012-05/msg01866.html
> 
> This patch series is work in progress but I wanted to
> post it early enough so I can get feedback from people.

The main thing which is missing here, which makes it rather hard to
review, is any kind of design documentation. It would also be great to
see the rationale for why things have to be done this way.

For example it seems that there is a bunch of stuff being added to the
hypervisor which could live in the context of some guest or service
domain -- putting stuff like that in the hypervisor needs strong
arguments and rationale why it has to be there rather than somewhere
else.

Likewise perhaps the v4v hypercall could effectively be implemented with
a multicall containing some grant copy ops and evtchn manipulations?

But in the absence of any descriptions of the whats, hows and whys of
v4v its rather hard to have these sorts of conversations. The above are
some concrete examples but I'm more interested in seeing the more
general descriptions before we get into those.

Ian.



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