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Re: [RFC PATCH] configure: deprecate 32 bit build hosts

From: Thomas Huth
Subject: Re: [RFC PATCH] configure: deprecate 32 bit build hosts
Date: Thu, 26 Sep 2019 16:26:05 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0

On 26/09/2019 15.46, Christian Borntraeger wrote:
> On 26.09.19 14:58, Daniel P. Berrangé wrote:
>> On Thu, Sep 26, 2019 at 08:50:36AM +0100, Peter Maydell wrote:
>>> On Thu, 26 Sep 2019 at 00:31, Alex Bennée <address@hidden> 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.
>>>> 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.
>> What if the kernel is waiting for QEMU to drop support too ;-P
> For what its worth on kvm/s390 we never cared about implementing
> 32 bit. 

Looking at tcg/s390/tcg-target.inc.c :

/* We only support generating code for 64-bit mode.  */
#error "unsupported code generation mode"

... it seems to me that TCG does not support 32-bit on s390 either. I
think we can remove s390 (32-bit) from the list completely?


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