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

[Stefan Hajnoczi <stefanha@redhat.com>]

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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.

Stefan

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