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Re: [Qemu-devel] [RFC] dump memory when host pci device is used by guest
From: |
Wen Congyang |
Subject: |
Re: [Qemu-devel] [RFC] dump memory when host pci device is used by guest |
Date: |
Mon, 21 Nov 2011 16:06:46 +0800 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100413 Fedora/3.0.4-2.fc13 Thunderbird/3.0.4 |
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
>
[Qemu-devel] [RFC][PATCH] introduce a new monitor command 'dump' to dump guest's memory, Wen Congyang, 2011/11/29