Re: Rust in Qemu BoF followup: Rust vs. qemu platform support

[David Gibson]

On Fri, Sep 17, 2021 at 04:59:09PM +0100, Stefan Hajnoczi wrote:
65;6402;1c> On Fri, Sep 17, 2021 at 12:34:29PM +0100, Daniel P. Berrangé wrote:
> > On Fri, Sep 17, 2021 at 06:58:37PM +1000, David Gibson wrote:
> > > 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.
> > > 
> > > I've added the information to our wiki at:
> > >   https://wiki.qemu.org/RustInQemu
> > > 
> > > TBH, the coverage is not as good as I expected.  Linux, macOS and
> > > Windows are pretty much ok, with the exception of Linux on Sparc.
> > > There are a lot of gaps in *BSD support, however.
> > 
> > To me the coverage looks pretty much what I'd expect to need
> > for QEMU - almost all boxes that I'd want to see green are
> > green, except OpenBSD, possibly x86 32-bit for *BSD and
> > sparc(64) on Linux.
> > 
> > Mostly it highlights that we've never explicitly declared what
> > our architecture coverage is intended to be. We do check host
> > arches in configure, but we didn't distinguish this by OS and
> > I think that's a mistake.
> > 
> > In terms of our CI coverage, the only non-x86 testing we do
> > is for Linux based systems.
> > 
> > Although its possible people use non-x86 on non-Linux, I don't
> > recall any discussions/bugs/patches targetting this situation,
> > so if we do have users I doubt there's many.
> 
> macOS on Apple silicon is a non-x86 non-Linux host platform that is
> currently receiving some developer attention. Luckily
> aarch64-apple-darwin is in Tier 2 with host tools.

Yeah, I was figuring macOS on aarch64 would be important with macOS
moving to ARM.  But as you say, that is ok in rust.  Not so much
"luckily" as that being a consequence of it being a fairly active
platform in general.

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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