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Re: [Qemu-devel] [RFC] dump memory when host pci device is used by guest
From: |
Sergio Durigan Junior |
Subject: |
Re: [Qemu-devel] [RFC] dump memory when host pci device is used by guest |
Date: |
Sat, 26 Nov 2011 19:45:08 -0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux) |
Jan Kiszka <address@hidden> writes:
> 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.
Hello,
IIRC, GDB supports ELF64 corefiles on x86 boxes, but only when
configured with `--enable-64-bit-bfd'. Otherwise, it won't be able to
properly understand the format.
[Qemu-devel] [RFC][PATCH] introduce a new monitor command 'dump' to dump guest's memory, Wen Congyang, 2011/11/29