linux-kernel - Re: [PATCH 2/3] x86: Add UV memory protection bios call

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Date:	Wed, 22 Oct 2008 08:22:35 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Russ Anderson <rja@....com>
Cc:	tglx@...utronix.de, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/3] x86: Add UV memory protection bios call


* Russ Anderson <rja@....com> wrote:

> Add UV bios call to change memory protections.
> 
> Signed-off-by: Russ Anderson <rja@....com>
> 
> ---
>  arch/x86/kernel/bios_uv.c |    8 ++++++++
>  include/asm-x86/uv/bios.h |   10 +++++++++-
>  2 files changed, 17 insertions(+), 1 deletion(-)

> -	UV_BIOS_WATCHLIST_FREE
> +	UV_BIOS_WATCHLIST_FREE,
> +	UV_BIOS_MEMPROTECT

> +enum uv_memprotect {
> +	UV_MEMPROT_RESTRICT_ACCESS,
> +	UV_MEMPROT_ALLOW_AMO,
> +	UV_MEMPROT_ALLOW_RW

hm, what does this do? Does it twiddle the southbridge to protect given 
physical RAM rages from the CPU altogether?

	Ingo
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