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Re: [Qemu-devel] [help]: how to use HMP command dump-guest-memory

From: Wen Congyang
Subject: Re: [Qemu-devel] [help]: how to use HMP command dump-guest-memory
Date: Thu, 19 Jul 2012 15:41:22 +0800
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At 07/19/2012 03:29 PM, Sheldon Wrote:
> thank you.
> can you tell me what's the difference between memsave and
> dump-guest-memory without -p option?

IIRC, memsave only contains memory. The core generated by
dump-guest-memory contains registers' value, and you can use
crash to deal with it.

> and what's the difference between *kernel coredump *and
> dump-guest-memory with -p option?

kernel coredump? Do you mean kdump?

They are almost the same. The core generated by dump-guest-memory
contains some registers' value which is not included in the core
generated by kdump.

The kdump runs in the guest, while dump-guest-memory runs in
the host. If you forget to start kdump, you can use dump-guest-memory
to get the core.

Wen Congyang

> On 07/19/2012 01:42 PM, Wen Congyang wrote:
>> At 07/19/2012 12:47 AM, Sheldon Wrote:
>>> I want to dump all guest's memory to file ./guestcore
>>> I execute this command as follow:
>>> (qemu) dump-guest-memory -p protocol file:./guestcore
>>> invalid char in expression
>> Please try this command:
>> dump-guest-memory -p file:./guestcore
>> Thanks
>> Wen Congyang

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