From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5ACD5C433F5 for ; Mon, 20 Sep 2021 05:10:03 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6C7B160E94 for ; Mon, 20 Sep 2021 05:10:02 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 6C7B160E94 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=gibson.dropbear.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:34198 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mSBZ2-0003lP-Id for qemu-devel@archiver.kernel.org; Mon, 20 Sep 2021 01:10:00 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:47676) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mSBWg-0002NF-G0 for qemu-devel@nongnu.org; Mon, 20 Sep 2021 01:07:35 -0400 Received: from ozlabs.org ([2401:3900:2:1::2]:36489) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mSBWa-0008Gx-8B for qemu-devel@nongnu.org; Mon, 20 Sep 2021 01:07:33 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gibson.dropbear.id.au; s=201602; t=1632114436; bh=CD+8NZcYY6GaHF66BPWX5mfulSkLUnto73wqly56k1Q=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=moMmcdO0E/Gt3EnuMS59aI983uUGP2OEvvRMXsdAK/ATIYYJ+TyBYnAwn7KoL1oPA eiA3MYn4ST0H88ok+0WAKW9PCKyhaKmbYzI/adzL09+wrBKuLWX41lichJidwXhzf5 Nu+SFCaxpmfwuyXGC+Ns6stBaH/4AAN7hrrylxMU= Received: by ozlabs.org (Postfix, from userid 1007) id 4HCXc45wgWz9ssP; Mon, 20 Sep 2021 15:07:16 +1000 (AEST) Date: Mon, 20 Sep 2021 13:43:49 +1000 From: David Gibson To: Daniel =?iso-8859-1?Q?P=2E_Berrang=E9?= Subject: Re: Rust in Qemu BoF followup: Rust vs. qemu platform support Message-ID: References: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="HGLFj1CArKLNkYhW" Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=2401:3900:2:1::2; envelope-from=dgibson@ozlabs.org; helo=ozlabs.org X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, slp@redhat.com, cohuck@redhat.com, qemu-devel@nongnu.org, f4bug@amsat.org, hreitz@redhat.com, stefanha@redhat.com, marcandre.lureau@redhat.com, pbonzini@redhat.com, alex.bennee@linaro.org, sgarzare@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" --HGLFj1CArKLNkYhW Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Sep 17, 2021 at 12:34:29PM +0100, Daniel P. Berrang=E9 wrote: > On Fri, Sep 17, 2021 at 06:58:37PM +1000, David Gibson wrote: > > Hi all, > >=20 > > 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. > >=20 > > I've added the information to our wiki at: > > https://wiki.qemu.org/RustInQemu > >=20 > > 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. >=20 > 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. >=20 > 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. >=20 > In terms of our CI coverage, the only non-x86 testing we do > is for Linux based systems. >=20 > 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. >=20 > Would be interesting to hear input from anyone representing > interests of the various *BSD platforms about their thoughts > wrt non-x86 coverage. >=20 > I think our first step is probably to make our architecture > support explicit, regardless of our use of Rust. I agree. Currently https://qemu-project.gitlab.io/qemu/about/build-platforms.html lists build OSes and build architectures separately, which kind of implies the full matrix - but I don't think we really want to support that, so I think we should pin this down more precisely. > If we assume QEMU followed a similar 3 tier policy, on the QEMU > side my interpretation of what we're implicitly targetting would > be: >=20 > Linux: all arches with a TCG target > macOS: x86_64 + aarch64, since that's on the way. > Windows: i686, x86_64 > FreeBSD: x86_64 (maybe +i686 too) > NetBSD: x86_64 (maybe +i686 too) > OpenBSD: x86_64 (maybe +i686 too) >=20 > with tier 1 vs 2 for the above depending on whether we run > 'make check' in gating CI) >=20 > That isn't to say that other combinations don't work, but if they > did work, they would be at most Tier 3 from QEMU's POV. Makes sense to me. --=20 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 --HGLFj1CArKLNkYhW Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEdfRlhq5hpmzETofcbDjKyiDZs5IFAmFIA3UACgkQbDjKyiDZ s5IMtxAAvc7OBtgsLtXhLu6cTeJ3dVxH+Wq5z5GOTG4AwUuc1GM2SI4Kge1dfJCO 3OqKIbr8QqR5cDZbejd+HYgXjUv6YeetNGSEYaFde3QJmg6mdPXV13QA5V368aT1 yhDyyR+OX4MRZGHUY09i060Q24ZtMCB8lZX65kEZSwduvaAmeDCV3+PdYnbHW/O2 3IsORs7jy1KhCvoMHcv/PUDtZiDjJGStv2jvYVlRZCfwz5O/SI9xq4Q4/pJTXnVR LNN2q7AYhiC25JB6fedZsZdsTVjk7+mqmKZ4n7qoGsDmyMq2rWYkRKhTJVIUNN6G xD4Dr5HFoqqE3OYQ4OSLViNJFY7gMF7i7PedWYiVgDFGjsJmj5EGdxJ2FSi+GqpI URTAbdtiy1hJ/kCHOAX7DcwFrP6VY7OpsHk564n2h1nEMtzMEJIJyEnh4v7saK10 0cGR61kItDXFnJnfoddtzygEWog5eqdx4gLti6nwnei376xWTpiiJryfTdKAaQKX 0SQazVyMnCOLb5MzA6Ozqfu+Ki3gPzl7iJ76JiPzVMzF4b73vH92GV5jssXYNlhZ DK5Qr0snYlwHqaUViQlnrmnBf0Kk2lNR52g+tNbaT3WfsaHPEkmZjhAjNnHwJ89T Ykw0nR06RL4tKVa7waTr0IsuOWCrhIiZ4KbYm3BUHep2aVawt6c= =9LEK -----END PGP SIGNATURE----- --HGLFj1CArKLNkYhW--