Re: [Qemu-devel] [RFC] dump memory when host pci device is used by guest

[Wen Congyang <wency@cn.fujitsu.com>]

At 11/18/2011 08:46 PM, Jan Kiszka Write:
> On 2011-11-16 14:29, Dave Anderson wrote:
>>
>>
>> ----- Original Message -----
>>> Hi, all
>>>
>>> 'virsh dump' can not work when host pci device is used by guest. We have
>>> discussed this issue here:
>>> http://lists.nongnu.org/archive/html/qemu-devel/2011-10/msg00736.html
>>>
>>> We have determined to introduce a new command dump to dump memory.
>>> The core file's format can be elf.
>>>
>>> I created a kdump-elf vmcore, and found that it can be used by both
>>> crash and gdb:
>>>

>> From an enterprise/support point of view, the wholesale replacement
>> of the current use of the savevm dumpfile format by "virsh dump" with
>> this ELF style format would be a *huge* improvement. 
> 
> Yes, fully agree. Would be cool if that could actually work for both
> crash and gdb. Looking forward!

Because the memory size for x86 machine can greater than 4G, so we should
create elf64 format core file for 32bit OS.

I create a vmcore: the guest OS is 32-bit, and the vmcore is elf64 format.
I can use crash to anaylyze it, but gdb can not do the same thing.

I create a kdump-elf64 vmcore on 32-bit machine, and gdb still can not anaylyze
it.

Does gdb support elf64 format core file on x86 box?

Thanks
Wen Congyang

> 
> Jan
>