Re: [GSoC 2026] vhost-user memory isolation proposal feedback request

[Hanna Czenczek <hreitz@redhat.com>]

Hi Han,

I’ve taken a look at your proposal, thanks for submitting it!

It clearly shows you looked into the code and the vhost-user spec and 
made yourself familiar with both, that’s very good. I find it a solid 
concept. I also like your clear separation in fundamental work and later 
optimization.

I have one question: In the optimization section, you suggest using a 
memory pool. I fully agree that’s a good optimization, but it makes me 
wonder what model you have in mind for the original implementation. Do 
you plan on allocating a new buffer for each request? (To be clear: I’m 
not saying that would be a bad idea for the initial proof-of-concept, 
I’m just asking for clarification.)

To help make these detail questions clearer, could you lay out how an 
example request from the guest to the vhost-user back-end would go 
through all the layers, and the response back?


Hanna