Re: 9p file system for xen

[Linda <lindaj@jma3.com>]

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On 11/17/2015 11:35 AM, Neil Sikka wrote:
> How does Linda's work relate to Wei's patches available here (I didnt 
> see them in Xen-4.6.0):
>
> http://downloads.xen.org/Wiki/VirtioOnXen/qemu-01-xenpv-exec.patch
> http://downloads.xen.org/Wiki/VirtioOnXen/qemu-02-virtio-for-pv.patch
I'll let Wei answer this.
>
> Also, since 9p is being worked on, which is a filesystem that should 
> be implemented in a kernel rather than a hypervisor, are you looking 
> to contribute this driver to the Linux kernel?
What I did was write new kernel routines and new Qemu routines, as well 
as modifying a few existing Qemu files.  The initialization is currently 
done manually by modifying xenstore.  This is the only code that 
properly belongs in the hypervisor.

I hope this clarifies things.

Linda
>
> On Mon, Nov 16, 2015 at 10:02 PM, Linda <lindaj@jma3.com 
> <mailto:lindaj@jma3.com>> wrote:
>
>     Hi Wei,
>
>     On 11/16/2015 10:35 AM, Wei Liu wrote:
>
>         On Mon, Nov 16, 2015 at 10:22:41AM -0700, Linda wrote:
>
>     ...
>
>
>             The bug is a timing issue:  During virtio's probe step, on
>             the front end, it
>             initialized the mount path.  Since at that time, the front
>             end doesn't have
>             access to the back end's entries in xenstore (AFIACT), I
>             either need to put
>             it in xenstore prior to starting, or move the access to
>             this information to
>             later in the initialization.
>
>             Note, I used the past tense on what virtio did, as of last
>             summer: when I
>             looked at it last week, it appears to have changed since I
>             first used it as
>             a template.    I need to investigate this further.
>
>         OK.
>
>             Finally, I've made no provision for how to mount more than
>             one file system
>             for the same guest.  This is a feature that virtio
>             provides for in the
>             front-end code (as do I), but I am unclear about how this
>             works in the
>             back-end or at the user level.  This is what I suspect
>             will be different in
>             xen, and I'd like some input on what it should look like.
>
>         I think this comes down to how your design the xenstore
>         protocol to
>         represent different mount points.
>
>     And just reading this gave me the answer I need.
>
>
>                 The code freeze for next release is going to be end of
>                 March next year.
>                 As software engineer often overestimates the progress
>                 he or she can
>                 make, I would say we shall aim for getting something
>                 working as soon as
>                 possible. Get the design straight and something clean
>                 by the end of this
>                 year would be good.
>
>             Sounds good to me.  I'm happy to keep working on this.  I
>             just didn't want
>             to find myself in a position where I needed to pass this
>             on to someone else,
>             but I didn't give that person enough time to finish what
>             I'd done.
>
>         Depending on the situation, I can take over the code. You've
>         done enough
>         for this project and we don't really want you to work on it
>         for free --
>         we don't have provision for more funding at the moment.
>
>     Understood.
>
>         If we end up taking over the project, we will still attribute the
>         initial implementation to you.
>
>         Thanks.  Julien said essentially the same thing.  Right now,
>     I'm working on average, less than 10 hours/week, so it's enough to
>     keep my mind engaged, but it doesn't interfere with anything else.
>         I will be working for pay, in some capacity (TBD), after the
>     first of the year.   Right now, I'm working to line things up.
>         Unless something changes drastically, I'll continue to work on
>     this until the end of the year.  I'll start by cleaning things up,
>     and keep it that way, so no matter what happens, you, or Julien,
>     can take it over.
>
>     Linda
>
>
>         Wei.
>
>
>
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>
>
>
>
> -- 
> My Blog: http://www.neilscomputerblog.blogspot.com/
> Twitter: @neilsikka


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