[PATCH 0/4] Export offsets of VMCS fields as note information for kdump

[Avi Kivity]

On 04/19/2012 03:01 PM, HATAYAMA Daisuke wrote:
> >> It would be not helpful for the qemu crash case you are concerned
> >> about. We want to use the guest state data to look into guest
> >> machine's image in the crasshed qemu.
> > 
> > Why?
> > 
>
> It seems natural to check the situation from guest machine's side when
> qemu crashs. Suppose a service is running on the guest machine, and
> then the qemu crash. Then, we may need to know the details of the
> progress of the service if it's important. What has been successfully
> done, and what has not yet.

How can a service on the guest be related to a qemu crash?  And how
would guest registers help?

You can extract the list of running processes from a qemu crash dump
without looking at guest registers.  And most vcpus are running
asynchronously to qemu, so their register contents is irrelevant (if a
vcpu is running synchronously with qemu - it just exited to qemu and is
waiting for a response - then you'd see the details in qemu's call stack).

-- 
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