Re: [RFC] Virtualizing tagged disaggregated memory capacity (app specific, multi host shared)

Hannes Reinecke
2024-08-16T07:05:50Z

On 8/15/24 18:22, Jonathan Cameron wrote:
> Introduction
> ============
>
> If we think application specific memory (including inter-host shared memory) is
> a thing, it will also be a thing people want to use with virtual machines,
> potentially nested. So how do we present it at the Host to VM boundary?
>
> This RFC is perhaps premature given we haven't yet merged upstream support for
> the bare metal case. However I'd like to get the discussion going given we've
> touched briefly on this in a number of CXL sync calls and it is clear no one is
> entirely sure what direction make sense. We may briefly touch on this in the
> LPC CXL uconf, but time will be very limited.
>
Thanks for the detailed write-up.

Can't we have an ad-hoc meeting at OSS/LPC to gather interested/relevant
people to explore ideas around this?

In particular I'd be interested on how to _get_ the application specific
memory to the application in question. It's easy if you have your own
application and design it to work on DAX devices. Obviously this
approach won't work for unmodified applications; however, they really
might want to use this, too.

And, of course, the other mentioned problems are worth discussing, and I
do agree that the uconf will probably not providing sufficient time for
this.

Cheers,

Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
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