Re: [Xen-devel] Proposal to allow setting up shared memory areas between VMs from xl config file

[Wei Liu <wei.liu2@xxxxxxxxxx>]

Sorry for not replying earlier. I was on vacation.

On Wed, May 24, 2017 at 01:29:59AM +0800, Zhongze Liu wrote:
> Hi there,
> 
> Thanks for your comments. They are all very insightful.
> 
> Having read through the discussions so far, I can draw the
> following conclusions:
> 
> 0. The syntax and semantics of the new config option should be more clearlly
>     defined. And this actually depends on the following:
> 
> 1. If we're going to make this project arch-neutral, then the manifestation
>     of the frame numbers should also be arch-neutral;
> 
> 2. Attributes such as readability, writability (and maybe even
>     cacheability and shareability) should be able to be specified in the
>     config files
> 
> 3. We should allow users to specify the mfn of the shared pages as well. (but
>     I think maybe we could just specify a memory zone (if we're dealing
>     with NUMA) instead of a specific physical address).
> 
> 4. (maybe in the future) Set up a notification channel between domains
>     who are communicating through shared memory regions. The
>    channel could be built upon PPI or SGI.
> 
> 5. Clearify the ownership of shared pages, and thus the creation order.
>     I thinks I've already clearify this in my proposal -- we just
> treat the first domain
>     created with the shared memory range as the owner.
>     But specifying  this in the config file also makes sense. Then we'll have 
> to
>     enforced that the owner is created prior to all the "clients".
> 
> After talking to stefano, I'll try to first come out with a tiny but
> working prototype
> and do some evaluations on it. I'll not fully deny the possibility of using
> the grants api as the final implementation choice.
> 

I think this is a reasonable plan.

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