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Re: [Qemu-devel] [RFC] dump memory when host pci device is used by guest
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [RFC] dump memory when host pci device is used by guest |
Date: |
Sat, 26 Nov 2011 08:27:14 -0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
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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[Qemu-devel] [RFC][PATCH] introduce a new monitor command 'dump' to dump guest's memory, Wen Congyang, 2011/11/29