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Date: Sat, 26 Apr 2008 15:40:22 +0200
From: Gabriel C <nix.or.die@googlemail.com>
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To: Ingo Molnar <mingo@elte.hu>
CC: Linus Torvalds <torvalds@linux-foundation.org>,
       linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>,
       "H. Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [git pull] x86 PAT changes
References: <20080424225625.GB8717@elte.hu>
In-Reply-To: <20080424225625.GB8717@elte.hu>
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Ingo Molnar wrote:
> Linus, please pull the x86-pat git tree from:
> 
>    git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86-pat.git for-linus
> 
> this adds the second (and final) phase of the x86 PAT changes. Due to 
> generic impact (the drivers/char/mem.c and include/asm-generic/iomap.h 
> changes) this is offered as a separate tree.
> 
> The new CONFIG_NONPROMISC_DEVMEM defaults to disabled so PAT will be 
> disabled, to stay compatible and to be a bit cautious/gradual.
> 

Hi Ingo,

When using an 64bit ( didn't got time to test 32bit now ) kernel[1] with PAT enabled , kvm-intel
does not work anymore. 

When modprobing kvm-intel , kvm is saying VT extension is disable by BIOS which isn't true.
When disabling PAT again ( no changes to BIOS ) kvm-intel works again here.

Is that an known problem ?

If you need more infos just let me know.

Gabriel

[1]  2.6.25-05096-gb1721d0-dirty
     with following patches :
     http://lkml.org/lkml/2008/4/26/37
     http://lkml.org/lkml/2008/4/26/24
     http://lkml.org/lkml/2008/4/25/107