linux-kernel - Re: [PATCH] x86: Limit E820 map when a user-defined memory map is specified

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Date:	Wed, 25 Jun 2008 12:59:15 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Bernhard Walle" <bwalle@...e.de>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	kexec@...ts.infradead.org, vgoyal@...hat.com
Subject: Re: [PATCH] x86: Limit E820 map when a user-defined memory map is specified

On Wed, Jun 25, 2008 at 12:39 PM, Bernhard Walle <bwalle@...e.de> wrote:
> This patch brings back limiting of the E820 map when a user-defined
> E820 map is specified. While the behaviour of i386 (32 bit) was to limit
> the E820 map (and /proc/iomem), the behaviour of x86-64 (64 bit) was not to
> limit.
>
> That patch limits the E820 map again for both x86 architectures.
>
> Code was tested for compilation and booting on a 32 bit and 64 bit system.
>
>
> Signed-off-by: Bernhard Walle <bwalle@...e.de>

Acked-by: Yinghai Lu <yhlu.kernel@...il.com>

> ---
>  arch/x86/kernel/e820.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
> index a1b0548..3771386 100644
> --- a/arch/x86/kernel/e820.c
> +++ b/arch/x86/kernel/e820.c
> @@ -988,6 +988,9 @@ static int __init parse_memopt(char *p)
>
>        mem_size = memparse(p, &p);
>        end_user_pfn = mem_size>>PAGE_SHIFT;
> +       e820_update_range(mem_size, ULLONG_MAX - mem_size,
> +               E820_RAM, E820_RESERVED);
> +
>        return 0;
>  }
>  early_param("mem", parse_memopt);
> @@ -1032,6 +1035,8 @@ static int __init parse_memmap_opt(char *p)
>                e820_add_region(start_at, mem_size, E820_RESERVED);
>        } else {
>                end_user_pfn = (mem_size >> PAGE_SHIFT);
> +               e820_update_range(mem_size, ULLONG_MAX - mem_size,
> +                       E820_RAM, E820_RESERVED);
>        }
>        return *p == '\0' ? 0 : -EINVAL;
>  }
> --
--
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