[Xen-devel] [PATCH 1/2] xen: Improve calculation of beginning of virtual address space

[Konrad Rzeszutek Wilk]

On Fri, Mar 15, 2013 at 04:09:21PM +0100, Daniel Kiper wrote:
> Xen changeset 26447 (x86: re-introduce map_domain_page() et al) once again
> altered virtual address space. Current algorithm calculating its start could
> not cope with that change. New version establishes this value on the base of
> image start address and is more generic.

And it works with the older (3.4) hypervisors binary image?
> 
> Signed-off-by: Daniel Kiper <daniel.kiper at oracle.com>
> 
> diff -Npru crash-6.1.4.orig/xen_hyper.c crash-6.1.4/xen_hyper.c
> --- crash-6.1.4.orig/xen_hyper.c	2013-02-14 21:38:54.000000000 +0100
> +++ crash-6.1.4/xen_hyper.c	2013-03-15 13:11:16.595713662 +0100
> @@ -43,10 +43,14 @@ xen_hyper_init(void)
>  #endif
>  
>  #ifdef X86_64
> -	if (xen_major_version() >= 4)
> -		xht->xen_virt_start = 0xffff82c480000000;
> -	else
> -		xht->xen_virt_start = 0xffff828c80000000;
> +	xht->xen_virt_start = symbol_value("start");
> +
> +	/*
> +	 * Xen virtual mapping is aligned to 1 GiB boundary.
> +	 * Image starts no more than 1 GiB below
> +	 * beginning of virtual address space.
> +	 */
> +	xht->xen_virt_start &= 0xffffffffc0000000;
>  #endif
>  
>  	if (machine_type("X86_64") &&
> 
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