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

[Jan Kiszka]

On 2011-11-21 06:06, Wen Congyang wrote:
> 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?
> 

Dunno, but I'm trying to pull in some interested gdb folks.

Jan

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