Re: [Qemu-devel] [RFC for 2.8 1/3] configure: check CPU width and disable larger guests

From: Richard Henderson <rth@twiddle.net>
To: "Alex Bennée" <alex.bennee@linaro.org>, qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org
Subject: Re: [Qemu-devel] [RFC for 2.8 1/3] configure: check CPU width and disable larger guests
Date: Tue, 9 Aug 2016 23:36:35 +0530	[thread overview]
Message-ID: <779486c3-29cf-46fd-37be-2d358b6fcdd2@twiddle.net> (raw)
In-Reply-To: <1470758127-17769-2-git-send-email-alex.bennee@linaro.org>

On 08/09/2016 09:25 PM, Alex Bennée wrote:
> -  ia64|ppc|ppc64|s390|s390x|sparc64|x32)
> +  ppc|s390|x32)
>      cpu="$cpu"
> +    cpu_width=32
> +  ;;
> +  ia64|ppc64|s390x|sparc64)
> +    cpu="$cpu"
> +    cpu_width=64
>    ;;
>    i386|i486|i586|i686|i86pc|BePC)
>      cpu="i386"
> +    cpu_width=32
>    ;;
>    x86_64|amd64)
>      cpu="x86_64"
> +    cpu_width=64
>    ;;
>    armv*b|armv*l|arm)
>      cpu="arm"
> +    cpu_width=32
>    ;;
>    aarch64)
>      cpu="aarch64"
> +    cpu_width=32
>    ;;
>    mips*)
>      cpu="mips"
>    ;;
>    sparc|sun4[cdmuv])
>      cpu="sparc"
> +    cpu_width=32

Note that x32 and sparc are both 64-bit hosts with 32-bit pointers (we don't 
support sparcv8 as a host anymore, just sparcv8+, aka sparcv9 in a 32-bit context).

Not that I believe these to be interesting hosts, since VMA space is half the 
battle when it comes to emulation.

r~