[Qemu-devel] Re: A new direction for vmchannel?

[Anthony Liguori]

Gleb Natapov wrote:
> On Fri, Jan 23, 2009 at 08:45:33AM -0600, Anthony Liguori wrote:
>   
> > Thoughts?
> >
> >     
> Looks good, but I am not to much familiar with p9. Will it provide us
> with stream semantics?

Sure.  It has read and write operations.  You just have to implement 
them in the same sort of way you'd implement them for a character device.

>  How much work is needed to support this in
> Windows (what is your estimation)?

If you structure your guest applications to use a library, sort of like 
libsysfs, then on Windows, you could implement a 9P client in 
userspace.  I have a 9P client that can be used for this.  You just need 
some way to get the stream to userspace.  You could write a virtio 
windows driver that exposed the stream down to userspace.  You could 
also use an alternative transport for Windows (like a serial port).

>  Will migration be transparent to
> in guest users?
>   

There's no better migration story for vmchannel backends implemented 
outside of QEMU.  For the ones in QEMU, migration should be transparent.

Regards,

Anthony Liguori

> --
>                         Gleb.
>