From: Eric Johnson <ericj@mips.com>
To: Richard Henderson <rth@twiddle.net>
Cc: Peter Maydell <peter.maydell@linaro.org>,
Riku Voipio <riku.voipio@linaro.org>,
Michael Tokarev <mjt@tls.msk.ru>, Alexander Graf <agraf@suse.de>,
qemu-devel qemu-devel <qemu-devel@nongnu.org>,
Aurelien Jarno <aurelien@aurel32.net>
Subject: Re: [Qemu-devel] [PATCH] linux-user: fix mips 32-on-64 prealloc case
Date: Thu, 3 Jan 2013 11:09:11 -0800 [thread overview]
Message-ID: <50E5D757.4000209@mips.com> (raw)
In-Reply-To: <50E5D30D.1090308@twiddle.net>
On 01/03/2013 10:50 AM, Richard Henderson wrote:
> On 01/03/2013 10:39 AM, Eric Johnson wrote:
>> While making this change please keep in mind that newer MIPS32
>> processors allow more than 31 bits of user address space (up to 3.5
>> GiB) if they have Enhanced Virtual Address support.
> Interesting.
>
> Well, would you be able to help figure out exactly what's going on in:
>
> http://lists.gnu.org/archive/html/qemu-devel/2012-12/msg03233.html
>
> and the thread leading up to it?
>
> Now, I don't *know* that this is an emulation failure -- the linux-user-test
> binary certainly isn't aware of enhanced virtual addresses. So it's
> possible that (older?) binaries can't cope with more than 2GB.
>
> Alternately, it really is a translation problem somewhere...
>
>
> r~
That is correct. The current test and MIPS32 processors supported by
QEMU do not support more than 2 GiB of user space. I didn't mean to
imply otherwise.
Looking at the MIPS32 processor linux-user on a 64-bit host issue is
already on my long list of tasks. Sorry I have not been able to look at
it yet.
On second thought ignore my EVA comment for now. We'll worry about that
when implementing EVA.
Eric
next prev parent reply other threads:[~2013-01-03 19:09 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-03 13:17 [Qemu-devel] [PATCH] linux-user: fix mips 32-on-64 prealloc case Alexander Graf
2013-01-03 17:19 ` Peter Maydell
2013-01-03 17:24 ` Alexander Graf
2013-01-03 18:39 ` Eric Johnson
2013-01-03 18:50 ` Richard Henderson
2013-01-03 19:09 ` Eric Johnson [this message]
2013-01-08 15:45 ` Aurelien Jarno
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