Xen users - May 2010 - Core Dump of a 64 bit domU from 32 bit dom0

Hi,

I have a setup in which the hypervisor and my domU are 64 bit but the
dom0 is 32 bit. Now when I try to core dump my domU from the dom0, the
".xen_prstatus" section of the elf file contains data based on 32 bit
struct sizes instead of 64 bit struct sizes (vcpu_guest_context *
noOfVcpus). That is the size of that section is 2800 * no of vcpus
(http://lxr.xensource.com/lxr/source/tools/include/xen-foreign/reference.size)
instead of 5168 * no of cpus.

Is there any way to get the right data in the core dump file?

--
Regards,
Puneet
http://www.cs.ucsb.edu/~puneet

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For anyone who stumbles on this, there is a patch that fixes the issue.

http://old.nabble.com/-xen-unstable--libxc:-Fix-32-vs-64-bitness-issue-in-saving-vcpu-contexts-in-core-dump-td26528092.html

On Tue, May 18, 2010 at 11:25, Puneet Lakhina <puneet.lakhina@gmail.com>
wrote:
> Hi,
>
> I have a setup in which the hypervisor and my domU are 64 bit but the
> dom0 is 32 bit. Now when I try to core dump my domU from the dom0, the
> ".xen_prstatus" section of the elf file contains data based on 32
bit
> struct sizes instead of 64 bit struct sizes (vcpu_guest_context *
> noOfVcpus). That is the size of that section is 2800 * no of vcpus
>
(http://lxr.xensource.com/lxr/source/tools/include/xen-foreign/reference.size)
> instead of 5168 * no of cpus.
>
> Is there any way to get the right data in the core dump file?
>
> --
> Regards,
> Puneet
> http://www.cs.ucsb.edu/~puneet
>


-- 
Regards,
Puneet
http://www.cs.ucsb.edu/~puneet

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