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List:       linux-kernel
Subject:    Re: [PATCH] reserve end-of-conventional-memory to 1MB on 32-bit
From:       "Alexander van Heukelum" <heukelum () fastmail ! fm>
Date:       2008-02-29 22:26:50
Message-ID: 1204324010.2610.1239905639 () webmail ! messagingengine ! com
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On Fri, 29 Feb 2008 22:06:59 +0000, "Mark McLoughlin"
<markmc@redhat.com> said:
> On Fri, 2008-02-29 at 19:38 +0100, Alexander van Heukelum wrote:
> > My first guess is that the BIOS data area is completely non-existent for
> > Xen. Is it guaranteed that the memory is zeroed out on boot?
> 
> Yep, that seems to be the case
> 
> > In that case we can special-case it easily:
> > 
> > change:
> >         /* Paranoia: should never happen, but... */
> >         if (lowmem >= 0x100000)
> >                 lowmem = 0xa0000;
> > 
> > into:
> >         /* Strange case, like Xen ;) */
> >         if (lowmem == 0 || lowmem >= 0x100000)
> >                 lowmem = 0x9f000;
> > 
> > Can you test that?
> 
> Yes, that fixes boot for me.

Thanks for testing this.

I'ld rather not count on Xen providing zeroed memory, though. I'll
try to find a different solution. It's weekend anyhow ;).

Greetings,
    Alexander
-- 
  Alexander van Heukelum
  heukelum@fastmail.fm

-- 
http://www.fastmail.fm - Or how I learned to stop worrying and
                          love email again

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