linux-kernel - Re: [PATCH 0/4] Export offsets of VMCS fields as note information for kdump

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Message-ID: <4F8FF7AC.1060309@redhat.com>
Date:	Thu, 19 Apr 2012 14:31:56 +0300
From:	Avi Kivity <avi@...hat.com>
To:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
CC:	zhangyanfei@...fujitsu.com, mtosatti@...hat.com,
	ebiederm@...ssion.com, luto@....edu, joerg.roedel@....com,
	dzickus@...hat.com, paul.gortmaker@...driver.com, gregkh@...e.de,
	ludwig.nussel@...e.de, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, kexec@...ts.infradead.org
Subject: Re: [PATCH 0/4] Export offsets of VMCS fields as note information
 for kdump

On 04/19/2012 02:27 PM, HATAYAMA Daisuke wrote:
> >> The reason why we want to retrieve guest machine's memory image as
> >> crash dump is that then we can debug guest machine's status using
> >> symbolic debugger such as gdb and crash utility.
> >>
> >> This is very useful. Please consider the situation where engineers are
> >> forced to look into guest machine's memory image through qemu-kvm's
> >> process core dump using gdb without any symbolic information. It's
> >> very inefficient.
> > 
> > I still don't follow.  If qemu crashed, the values in guest registers
> > are irrelevant.  In what way can the help debug the qemu crash?
> > 
>
> 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?

-- 
error compiling committee.c: too many arguments to function

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