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Re: RFC: New device for zero-copy VM memory access


From: geoff
Subject: Re: RFC: New device for zero-copy VM memory access
Date: Sun, 03 Nov 2019 21:10:10 +1100
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On 2019-11-01 02:52, Dr. David Alan Gilbert wrote:
* address@hidden (address@hidden) wrote:


On 2019-11-01 01:52, Peter Maydell wrote:
> On Thu, 31 Oct 2019 at 14:26, <address@hidden> wrote:
> > As the author of Looking Glass, I also have to consider the
> > maintenance
> > and the complexity of implementing the vhost protocol into the
> > project.
> > At this time a complete Porthole client can be implemented in 150
> > lines
> > of C without external dependencies, and most of that is boilerplate
> > socket code. This IMO is a major factor in deciding to avoid
> > vhost-user.
>
> This is essentially a proposal that we should make our project and
> code more complicated so that your project and code can be simpler.
> I hope you can see why this isn't necessarily an argument that will hold
> very much weight for us :-)

Certainly, I do which is why I am still going to see about using vhost, however, a device that uses vhost is likely more complex then the device as it stands right now and as such more maintenance would be involved on your end also. Or have I missed something in that vhost-user can be used
directly as a device?

The basic vhost-user stuff isn't actually that hard;  if you aren't
actually shuffling commands over the queues you should find it pretty
simple - so I think your assumption about it being simpler if you avoid
it might be wrong.  It might be easier if you use it!

I have been looking into this and I am yet to find some decent
documentation or a simple device example I can use to understand how to
create such a device. Do you know of any reading or examples I can obtain
on how to get an initial do nothing device up and running?

-Geoff


Dave

>
> thanks
> -- PMM
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK



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