Re: [Qemu-devel] [PATCH 00/13 v7] Make 'dump-guest-memory' dump in kdump-compressed format

[Christian Borntraeger <borntraeger@de.ibm.com>]

On 17/01/14 08:46, qiaonuohan wrote:
> Hi, all
> 
> The last version is here:
> http://lists.nongnu.org/archive/html/qemu-devel/2014-01/msg00209.html
> 
> Command 'dump-guest-memory' was introduced to dump guest's memory. But the
> vmcore's format is only elf32 or elf64. The message is here:
> http://lists.gnu.org/archive/html/qemu-devel/2012-04/msg03379.html
> 
> Compared with migration, the missing of compression feature means regression
> to 'dump-guest-memory'. So we post these patches to make 'dump-guest-memory' be
> able to dump guest's in kdump-compressed format. Then vmcore can be much
> smaller, and easily to be delivered.

Nice, we certainly want that.
> 
> The kdump-compressed format is *linux specific* *linux standard* crash dump
> format used in kdump framework. The kdump-compressed format is readable only
> with the crash utility, and it can be smaller than the ELF format because of
> the compression support. To get more detailed information about
> kdump-compressed format, please refer to the following URL:
> http://sourceforge.net/projects/makedumpfile/
> 
> Note, similar to 'dump-guest-memory':
> 1. The guest should be x86 or x86_64. The other arch is not supported now.

What is the reason for that? Looking over the patch set, there seem to
be no architecture folder involved and others like s390x also have the
dump-guest-memory support. 
[...]