Re: [PATCH v2 00/21] hw/uefi: add uefi variable service

[Gerd Hoffmann]

  Hi,

> > Typically the kind of new code that I wish would be in Rust. But I
> > suppose it is too early yet, and you came to the same conclusion.
> > Probably a good candidate for rewrite though!
> 
> Perhaps too early for the device impl, but I would have thought
> the general var-service code could be done in rust today. It does
> not have all that much interaction with other parts of the QEMU
> codebase & thus wouldn't be building on the moving target of the
> QOM/Device abstractions. It would also be the prime part that
> could be shared with coconut-svsm too.

That remains to be seen.  The svsm code will indeed most likely be
written in rust.  There are a number of noteworthy differences though:

 * It's a totally different environment (no_std).
 * Persistent storage for the vars will be different.
 * Crypto code will be different (probably openssl because the vTPM
   needs that too, possibly native rust crypto).

So not fully sure the code sharing part will actually work out ...

I plan to keep this in mind when designing the svsm code though, and
then revisit things once I have some actual rust code for this and the
rust support in qemu is more mature.

take care,
  Gerd