linux-kernel - Re: [PATCH] xen: Fix for xen guest with mem

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Date:	Sun, 14 Sep 2008 23:43:13 +0200
From:	Roberto De Ioris <roberto@...it.it>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Ingo Molnar <mingo@...e.hu>, jeremy@...source.com,
	linux-kernel@...r.kernel.org, Mirko Iannella <mirko@...it.it>,
	Alex Nixon <alex.nixon@...rix.com>
Subject: Re: [PATCH] xen: Fix for xen guest with mem > 3.7G

On Sun, 2008-09-14 at 07:42 -0700, Jeremy Fitzhardinge wrote:
> PFN_PHYS() can truncate large addresses unless its passed a suitable
> large type.  This is fixed more generally in the patch series
> introducing phys_addr_t, but we need a short-term fix to solve a
> regression.
> 
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> Cc: roberto@...it.it
> ---
>  arch/x86/xen/setup.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> ===================================================================
> --- a/arch/x86/xen/setup.c
> +++ b/arch/x86/xen/setup.c
> @@ -42,7 +42,7 @@
>  
>  	e820.nr_map = 0;
>  
> -	e820_add_region(0, PFN_PHYS(max_pfn), E820_RAM);
> +	e820_add_region(0, PFN_PHYS((u64)max_pfn), E820_RAM);
>  
>  	/*
>  	 * Even though this is normal, usable memory under Xen, reserve


In this way you pass a 64bit integer to the function, but max_pfn in
origin is still 32bit.

max_pfn need to be 64bit to supporto more than 4GB

> 
> 
-- 
Roberto De Ioris
http://unbit.it
JID: roberto@...ber.unbit.it

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