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

[Jan Kiszka]

On 2011-10-18 09:58, Wen Congyang wrote:
> At 10/18/2011 03:52 PM, Jan Kiszka Write:
>> On 2011-10-18 09:15, Wen Congyang wrote:
>>> Hi, Jan Kiszka
>>>
>>> At 10/10/2011 05:34 PM, Jan Kiszka Write:
>>>> On 2011-10-10 11:02, Daniel P. Berrange wrote:
>>>>> On Mon, Oct 10, 2011 at 08:52:08AM +0200, Jan Kiszka wrote:
>>>
>>>>
>>>> Run gdb with "set debug remote 1" and watch the communication, it is not
>>>> that complex. But a dump command is probably simpler for those
>>>> scenarios, I agree.
>>>
>>> I have implemented the command dump and reuse migration's code. But I meet 
>>> a problem
>>> when I test it.
>>
>> Using migration code for dump is most probably the wrong approach as you
>> saw through that conflict. All you need are the register states and the
>> RAM. Reuse gdbstub services for this.
> 
> Hmm, if the migration code can not be reused, I think we should define a new
> qemu's vmcore format, and add some codes into crash to support such format.

Please try to avoid defining something new. Unless there is a striking
reason, standard gdb core files should be generated so that you can load
the dump directly into gdb for analysis.

Jan

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