linux-kernel - Re: [PATCH 4/4] xen: do not create the extra e820 region at an addr lower than 4G

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Date:	Tue, 12 Apr 2011 12:48:06 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	stefano.stabellini@...citrix.com
Cc:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	jeremy@...p.org, yinghai@...nel.org, hpa@...ux.intel.com,
	mingo@...e.hu
Subject: Re: [PATCH 4/4] xen: do not create the extra e820 region at an
 addr lower than 4G

On Tue, Apr 12, 2011 at 12:19:52PM +0100, stefano.stabellini@...citrix.com wrote:
> From: Stefano Stabellini <stefano.stabellini@...citrix.com>
> 
> Do not add the extra e820 region at a physical address lower than 4G
> because it breaks e820_end_of_low_ram_pfn().
> 
> It is OK for us to move the xen_extra_mem_start up and down because this
> is the index of the memory that can be ballooned in/out - it is memory
> not available to the kernel during bootup.

OK. Stuck it on rc3 queue.

> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> ---
>  arch/x86/xen/setup.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
> index 9c38bd1..a51e010 100644
> --- a/arch/x86/xen/setup.c
> +++ b/arch/x86/xen/setup.c
> @@ -229,7 +229,7 @@ char * __init xen_memory_setup(void)
>  
>  	memcpy(map_raw, map, sizeof(map));
>  	e820.nr_map = 0;
> -	xen_extra_mem_start = mem_end;
> +	xen_extra_mem_start = max((1ULL << 32), mem_end);
>  	for (i = 0; i < memmap.nr_entries; i++) {
>  		unsigned long long end;
>  
> -- 
> 1.7.2.3
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