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=-0.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 E2887C432C2 for ; Thu, 26 Sep 2019 07:54:50 +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 B2D0A2146E for ; Thu, 26 Sep 2019 07:54:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="UnbxwicJ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B2D0A2146E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:60532 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iDObx-00029z-Dj for qemu-devel@archiver.kernel.org; Thu, 26 Sep 2019 03:54:49 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:35978) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iDOZ8-0007qg-UA for qemu-devel@nongnu.org; Thu, 26 Sep 2019 03:51:55 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iDOZ5-00075M-KP for qemu-devel@nongnu.org; Thu, 26 Sep 2019 03:51:52 -0400 Received: from mail-oi1-f196.google.com ([209.85.167.196]:41805) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1iDOZ4-00071E-Lr for qemu-devel@nongnu.org; Thu, 26 Sep 2019 03:51:51 -0400 Received: by mail-oi1-f196.google.com with SMTP id w17so1262659oiw.8 for ; Thu, 26 Sep 2019 00:51:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=piBZm6c0B9OHu39h13g/t4GeewKYhac1BqjPaJCknOw=; b=UnbxwicJoCt+RX4tEOGBppHUBGSAJRNXpyj3gWj0oaK7EJcKfTSgqmlfn8uLsLbNgq jRORyjsOZBBG0kxWeg17GL/0CfiWml7dh6C6mwpwaYH4TvD/SOvnNqBpz1RkGZTwZBBm ZskEap5x9+crxkENXwueR/hsNRKZyQ9pCRaqzgtAJwGEyazYf4JWU+H2yLOTxbIUaUrF dZFg7hcRd2/8WuULWy7WORvj58P1O47BFxoMt7IeRx1S8hhQEd0x5q+Nz5Ww/H5vID/7 Am7bdhL11kJCunGI2jduLzBnuiT8o1pE1bgxvapi/jNUZsbgKvW/ACtquUKlQT3GQKjg k/dQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=piBZm6c0B9OHu39h13g/t4GeewKYhac1BqjPaJCknOw=; b=QVd7TzgP96o3RzCylfagplpJ57tlr02qzVP46VB3UNVNt8av3+HOQ5xylEfHmg9ccg J/++jIp1e8YMS4me6sY7cGLfikMBHCiHNJIkbtAaT4yOJ/Op4yS7Bf3oywmJWex0O2az EZTC8mBprKNWXhCnlJC7Wz/FxVNhP11eFBvSXcYJCOKYY1Q36RyXZdj39oSdaJGxCq/R G03K4U87wlmyMHH3NAxjy5+63mbVp2oBYAd23UmOjBixkn9d5djoabGt7MyOn2+OrmXd ayx9ax1PGcMGVqSzrY1iswo0HJiBnCNwAdy/iFMXUMg3znAXR1zl8oykUncx1MNU9NOy SR0Q== X-Gm-Message-State: APjAAAUIYrv7LeKxQ+aeMJIGKzMZh9twilcPw9xiekxuzq8pbllwL0H7 GZzV9pM61glJpJp0ZxSAbjKs1YF0mUDpGhXieSJnsg== X-Google-Smtp-Source: APXvYqxbWijizyJrPpz2AKFW3LQQpjXFZqprBuEWlwQub8z9oY8l3hkBkTX0AgQnhmMosvxD2itTGADbuVM6MWGJ00k= X-Received: by 2002:aca:50d8:: with SMTP id e207mr1517628oib.48.1569484248796; Thu, 26 Sep 2019 00:50:48 -0700 (PDT) MIME-Version: 1.0 References: <20190925233013.6449-1-alex.bennee@linaro.org> In-Reply-To: <20190925233013.6449-1-alex.bennee@linaro.org> From: Peter Maydell Date: Thu, 26 Sep 2019 08:50:36 +0100 Message-ID: Subject: Re: [RFC PATCH] configure: deprecate 32 bit build hosts To: =?UTF-8?B?QWxleCBCZW5uw6ll?= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.85.167.196 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: "open list:RISC-V" , Richard Henderson , QEMU Developers , qemu-discuss , qemu-s390x , qemu-arm , qemu-ppc@nongnnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Thu, 26 Sep 2019 at 00:31, Alex Benn=C3=A9e wro= te: > > The 32 bit hosts are already a second class citizen especially with > support for running 64 bit guests under TCG. We are also limited by > testing as actual working 32 bit machines are getting quite rare in > developers personal menageries. For TCG supporting newer types like > Int128 is a lot harder with 32 bit calling conventions compared to > their larger bit sized cousins. Fundamentally address space is the > most useful thing for the translator to have even for a 32 bit guest a > 32 bit host is quite constrained. > > As far as I'm aware 32 bit KVM users are even less numerous. Even > ILP32 doesn't make much sense given the address space QEMU needs to > manage. For KVM we should wait until the kernel chooses to drop support, I think. > @@ -745,19 +744,22 @@ case "$cpu" in > ;; > armv*b|armv*l|arm) > cpu=3D"arm" > - supported_cpu=3D"yes" > ;; I'll leave others to voice opinions about their architectures, but I still have 32-bit arm in my test set for builds, and I'm pretty sure we have users (raspi users, for a start). thanks -- PMM