On Fri, Sep 17, 2021 at 01:11:56PM +0200, Philippe Mathieu-Daudé wrote:
> Le ven. 17 sept. 2021 10:58, David Gibson <david@gibson.dropbear.id.au> a
> écrit :
> 
> > Hi all,
> >
> > At the qemu-in-rust BoF at KVM Forum, I volunteered to look into
> > whether Rust supported all the host/build platforms that qemu does,
> > which is obviously vital if we want to make Rust a non-optional
> > component of the build
> >
> 
> Could user mode emulation be impacted by this decision? What code used by
> user emulation could potentially be converted to Rust?

qemu-user does not have the same security requirements as qemu-system,
since the application is running under a given uid/gid on the host
system and can invoke system calls.

I think the benefits of Rust in qemu-user would be more around
expressiveness (language constructs like pattern matching, traits, etc)
and correctness (memory leaks, concurrency, etc). Both benefits might
motivate someone to write parts of qemu-user in Rust, so I guess the
answer is "all of it potentially could be converted". It's impossible to
know until someone contributes patches.

Stefan