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[88.21.68.240]) by smtp.gmail.com with ESMTPSA id o188sm2839780wma.14.2019.09.26.00.29.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 26 Sep 2019 00:29:12 -0700 (PDT) Subject: Re: [RFC PATCH] configure: deprecate 32 bit build hosts To: =?UTF-8?Q?Alex_Benn=c3=a9e?= , qemu-devel@nongnu.org References: <20190925233013.6449-1-alex.bennee@linaro.org> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Openpgp: id=89C1E78F601EE86C867495CBA2A3FD6EDEADC0DE; url=http://pgp.mit.edu/pks/lookup?op=get&search=0xA2A3FD6EDEADC0DE Message-ID: Date: Thu, 26 Sep 2019 09:29:11 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190925233013.6449-1-alex.bennee@linaro.org> Content-Language: en-US X-MC-Unique: O_VeUjffOv-fvvgwIicZ0g-1 X-Mimecast-Spam-Score: 0 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] X-Received-From: 205.139.110.120 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: qemu-riscv@nongnu.org, Richard Henderson , qemu-discuss@nongnu.org, qemu-s390x@nongnu.org, qemu-arm@nongnu.org, qemu-ppc@nongnnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 9/26/19 1:30 AM, Alex Benn=C3=A9e wrote: > 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. >=20 > 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. >=20 > Lets mark these machines as deprecated so we can have the wailing and > gnashing of teeth now and look to actually dropping the support in a > couple of cycles. >=20 > Signed-off-by: Alex Benn=C3=A9e > Cc: Richard Henderson > --- > configure | 24 +++++++++++++----------- > 1 file changed, 13 insertions(+), 11 deletions(-) >=20 > diff --git a/configure b/configure > index 542f6aea3f..776fd460b5 100755 > --- a/configure > +++ b/configure > @@ -728,7 +728,7 @@ ARCH=3D > # Normalise host CPU name and set ARCH. > # Note that this case should only have supported host CPUs, not guests. > case "$cpu" in > - ppc|ppc64|s390|s390x|sparc64|x32|riscv32|riscv64) > + ppc64|s390|s390x|sparc64|riscv64) > supported_cpu=3D"yes" > ;; > ppc64le) > @@ -737,7 +737,6 @@ case "$cpu" in > ;; > i386|i486|i586|i686|i86pc|BePC) > cpu=3D"i386" > - supported_cpu=3D"yes" > ;; > x86_64|amd64) > cpu=3D"x86_64" > @@ -745,19 +744,22 @@ case "$cpu" in > ;; > armv*b|armv*l|arm) > cpu=3D"arm" > - supported_cpu=3D"yes" I think linux-user is quite used in embedded stuff such NAS. Eventually this public don't need edge QEMU, it might keep using QEMU v5.0.stable until all NAS/embedded devices are 64-bit... > ;; > aarch64) > cpu=3D"aarch64" > supported_cpu=3D"yes" > ;; > - mips*) > + mips64*) > cpu=3D"mips" > supported_cpu=3D"yes" > ;; > + mips*) > + cpu=3D"mips" Similarly I can imagine linux-user being used on some routers. > + ;; > sparc|sun4[cdmuv]) > cpu=3D"sparc" > - supported_cpu=3D"yes" > + ;; > + x32|riscv32) x32 is borderline :) but yes, pointers are 32-bit. > ;; > *) > # This will result in either an error or falling back to TCI later > @@ -6438,12 +6440,12 @@ if test "$supported_cpu" =3D "no"; then > echo "WARNING: SUPPORT FOR THIS HOST CPU WILL GO AWAY IN FUTURE RELE= ASES!" > echo > echo "CPU host architecture $cpu support is not currently maintained= ." > - echo "The QEMU project intends to remove support for this host CPU i= n" > - echo "a future release if nobody volunteers to maintain it and to" > - echo "provide a build host for our continuous integration setup." > - echo "configure has succeeded and you can continue to build, but" > - echo "if you care about QEMU on this platform you should contact" > - echo "us upstream at qemu-devel@nongnu.org." > + echo "The QEMU project intends to remove support for all 32 bit host= " > + echo "CPUs in a future release. 64 bit hosts will need a volunteer" > + echo "to maintain it and to provide a build host for our continuous" > + echo "integration setup. configure has succeeded and you can continu= e" > + echo "to build, but if you care about QEMU on this platform you" > + echo "should contact us upstream at qemu-devel@nongnu.org." > fi > =20 > if test "$supported_os" =3D "no"; then >=20