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

[Sheldon]

On 07/19/2012 03:41 PM, Wen Congyang wrote:
> 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.
got it.
So if I want to get kdump, I can use  dump-guest-memory command.
And if I want to get a process coredump on guest OS , I should login the 
guest OS, and get the process coredump file.
> Thanks
> 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
> > >
> > > >