[PATCH] Don't use /sys/firmware/memmap for Xen

[Simon Horman]

On Wed, Nov 26, 2008 at 10:00:39AM +0100, Bernhard Walle wrote:
> On Xen, we have to use /proc/iomem to retrieve the memory area for the kexec'd
> kernel, not /sys/firmware/memmap. Dom0 kernel gets a E820 map that contains
> only one region:
> 
>     0000000000000000-0000000018e5e000 (System RAM)
> 
> Compared to the /proc/iomem:
> 
>     00000000-0009cbff : System RAM
>     0009cc00-0009ffff : reserved
>     000ce000-000d3fff : reserved
>     000e0000-000fffff : reserved
>     00100000-1fd6ffff : System RAM
>       01000000-04ffffff : Crash kernel
>       1ec00000-1fbfffff : Hypervisor code and data
>         1f0b4680-1f0b4873 : Crash note
>         1f0b4900-1f0b4a93 : Crash note
>         1f0b4b80-1f0b4d13 : Crash note
>         1f0b4e00-1f0b4f93 : Crash note
>     ...
> 
> Without that patch, /proc/vmcore is empty in the kexec'd kernel and I'm unable
> to copy the crashdump.

Thanks Bernhard, applied.

-- 
Simon Horman
  VA Linux Systems Japan K.K., Sydney, Australia Satellite Office
  H: www.vergenet.net/~horms/             W: www.valinux.co.jp/en