[Crash-utility] crash cannot work for the newest qemu's core

[Dave Anderson]

----- Original Message -----
> At 06/22/2012 09:06 PM, Dave Anderson Wrote:
> > 
> > 
> > ----- Original Message -----
> >>
> >>
> >> ----- Original Message -----
> >>> Hi, all
> >>>
> >>> When I use crash to deal with the vmcore generated by 'vrish dump',
> >>> I meet the following error:
> >>>
> >>> crash: seek error: kernel virtual address: ffffffff8180f1e0  type: "cpu_possible_mask".
> >>>
> >>> When I specify '-d 8' to get more information, I found the following message:
> >>>
> >>> NOTE: KVM/QEMU CPU_SAVE_VERSION 12 is greater than supported version 9
> >>>
> >>> So I guess crash does not support it now. Does anyone have plan to fix it?
> >>>
> >>> Thanks
> >>> Wen Congyang
> >>
> >> Hi Wen,
> >>
> >> Also, because of your familiarity with this area, I certainly invite you
> >> to take a look at this...  ;-)
> >>
> >> Thanks,
> >>   Dave
> > 
> > Hi Wen,
> > 
> > On a related note, what is the status with your "virsh dump-guest-memory"
> > replacement of "virsh dump"?  The last I saw, it seemed like the qemu guys
> > finally seemed willing to accept it?
> 
> dump-guest-memory is not a virsh's sub command. It is a qemu monitor command.
> The patches for qemu and libvirt have been merged into newest qemu/libvirt.

OK, but now I'm confused...  

I was presuming that you could run the new "dump-guest-memory" command from
the KVM host, specifying a particular guest, and it will create an ELF vmcore
that the crash utility can read.  But I don't know what the term "qemu monitor
command" means?  Is it a command that can be executed from a shell command line?

And will "virsh dump" still exist?  And if so, why?

Dave