From: Avi Kivity <avi@redhat.com>
To: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: dzickus@redhat.com, luto@mit.edu, gregkh@suse.de,
kvm@vger.kernel.org, joerg.roedel@amd.com, mtosatti@redhat.com,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
paul.gortmaker@windriver.com, zhangyanfei@cn.fujitsu.com,
ebiederm@xmission.com, ludwig.nussel@suse.de
Subject: Re: [PATCH 0/4] Export offsets of VMCS fields as note information for kdump
Date: Thu, 19 Apr 2012 14:31:56 +0300 [thread overview]
Message-ID: <4F8FF7AC.1060309@redhat.com> (raw)
In-Reply-To: <20120419.202707.276752866.d.hatayama@jp.fujitsu.com>
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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WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: HATAYAMA Daisuke <d.hatayama-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
Cc: dzickus-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
luto-3s7WtUTddSA@public.gmane.org,
gregkh-l3A5Bk7waGM@public.gmane.org,
kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
joerg.roedel-5C7GfCeVMHo@public.gmane.org,
mtosatti-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
paul.gortmaker-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org,
zhangyanfei-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org,
ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org,
ludwig.nussel-l3A5Bk7waGM@public.gmane.org
Subject: Re: [PATCH 0/4] Export offsets of VMCS fields as note information for kdump
Date: Thu, 19 Apr 2012 14:31:56 +0300 [thread overview]
Message-ID: <4F8FF7AC.1060309@redhat.com> (raw)
In-Reply-To: <20120419.202707.276752866.d.hatayama-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
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
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: zhangyanfei@cn.fujitsu.com, mtosatti@redhat.com,
ebiederm@xmission.com, luto@mit.edu, joerg.roedel@amd.com,
dzickus@redhat.com, paul.gortmaker@windriver.com, gregkh@suse.de,
ludwig.nussel@suse.de, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, kexec@lists.infradead.org
Subject: Re: [PATCH 0/4] Export offsets of VMCS fields as note information for kdump
Date: Thu, 19 Apr 2012 14:31:56 +0300 [thread overview]
Message-ID: <4F8FF7AC.1060309@redhat.com> (raw)
In-Reply-To: <20120419.202707.276752866.d.hatayama@jp.fujitsu.com>
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
next prev parent reply other threads:[~2012-04-19 11:32 UTC|newest]
Thread overview: 109+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-11 1:39 [PATCH 0/4] Export offsets of VMCS fields as note information for kdump zhangyanfei
2012-04-11 1:39 ` zhangyanfei
2012-04-11 1:49 ` [PATCH 1/4] x86: Add helper variables and functions to hold VMCSINFO zhangyanfei
2012-04-11 1:49 ` zhangyanfei
2012-04-11 1:50 ` [PATCH 2/4] KVM: VMX: Add functions to fill VMCSINFO zhangyanfei
2012-04-11 1:50 ` zhangyanfei
2012-04-11 8:48 ` Avi Kivity
2012-04-11 8:48 ` Avi Kivity
2012-04-11 8:48 ` Avi Kivity
2012-04-11 10:34 ` zhangyanfei
2012-04-11 10:34 ` zhangyanfei
2012-04-11 10:34 ` zhangyanfei
2012-04-11 11:41 ` Avi Kivity
2012-04-11 11:41 ` Avi Kivity
2012-04-11 11:41 ` Avi Kivity
2012-04-11 1:57 ` [PATCH 3/4] ksysfs: export VMCSINFO via sysfs zhangyanfei
2012-04-11 1:57 ` zhangyanfei
2012-04-11 1:57 ` zhangyanfei
2012-04-12 23:00 ` Greg KH
2012-04-12 23:00 ` Greg KH
2012-04-12 23:00 ` Greg KH
2012-04-17 1:52 ` zhangyanfei
2012-04-17 1:52 ` zhangyanfei
2012-04-17 2:30 ` Greg KH
2012-04-17 2:30 ` Greg KH
2012-04-11 1:58 ` [PATCH 4/4] kexec: Add crash_save_vmcsinfo to update VMCSINFO zhangyanfei
2012-04-11 1:58 ` zhangyanfei
2012-04-11 1:58 ` zhangyanfei
2012-04-11 8:56 ` [PATCH 0/4] Export offsets of VMCS fields as note information for kdump Avi Kivity
2012-04-11 8:56 ` Avi Kivity
2012-04-11 10:12 ` zhangyanfei
2012-04-11 10:12 ` zhangyanfei
2012-04-11 10:12 ` zhangyanfei
2012-04-11 11:15 ` Avi Kivity
2012-04-11 11:15 ` Avi Kivity
2012-04-11 10:21 ` Joerg Roedel
2012-04-11 10:21 ` Joerg Roedel
2012-04-11 10:21 ` Joerg Roedel
2012-04-11 10:49 ` Avi Kivity
2012-04-11 10:49 ` Avi Kivity
2012-04-11 10:49 ` Avi Kivity
2012-04-11 10:59 ` zhangyanfei
2012-04-11 10:59 ` zhangyanfei
2012-04-11 10:59 ` zhangyanfei
2012-04-17 7:44 ` Avi Kivity
2012-04-17 7:44 ` Avi Kivity
2012-04-17 7:44 ` Avi Kivity
2012-04-17 10:51 ` zhangyanfei
2012-04-17 10:51 ` zhangyanfei
2012-04-17 10:51 ` zhangyanfei
2012-04-17 10:59 ` Avi Kivity
2012-04-17 10:59 ` Avi Kivity
2012-04-17 10:59 ` Avi Kivity
2012-04-17 11:25 ` Wen Congyang
2012-04-17 11:25 ` Wen Congyang
2012-04-17 11:25 ` Wen Congyang
2012-04-17 13:04 ` Avi Kivity
2012-04-17 13:04 ` Avi Kivity
2012-04-17 13:04 ` Avi Kivity
2012-04-18 7:30 ` zhangyanfei
2012-04-18 7:30 ` zhangyanfei
2012-04-18 7:30 ` zhangyanfei
2012-04-18 8:24 ` Avi Kivity
2012-04-18 8:24 ` Avi Kivity
2012-04-18 8:24 ` Avi Kivity
2012-04-18 9:49 ` zhangyanfei
2012-04-18 9:49 ` zhangyanfei
2012-04-18 9:49 ` zhangyanfei
2012-04-18 11:56 ` Avi Kivity
2012-04-18 11:56 ` Avi Kivity
2012-04-18 11:56 ` Avi Kivity
2012-04-19 10:36 ` HATAYAMA Daisuke
2012-04-19 10:36 ` HATAYAMA Daisuke
2012-04-19 10:36 ` HATAYAMA Daisuke
2012-04-19 10:42 ` Avi Kivity
2012-04-19 10:42 ` Avi Kivity
2012-04-19 10:42 ` Avi Kivity
2012-04-19 11:27 ` HATAYAMA Daisuke
2012-04-19 11:27 ` HATAYAMA Daisuke
2012-04-19 11:27 ` HATAYAMA Daisuke
2012-04-19 11:31 ` Avi Kivity [this message]
2012-04-19 11:31 ` Avi Kivity
2012-04-19 11:31 ` Avi Kivity
2012-04-19 12:01 ` HATAYAMA Daisuke
2012-04-19 12:01 ` HATAYAMA Daisuke
2012-04-19 12:01 ` HATAYAMA Daisuke
2012-04-19 12:08 ` Avi Kivity
2012-04-19 12:08 ` Avi Kivity
2012-04-19 12:08 ` Avi Kivity
2012-04-20 10:11 ` HATAYAMA Daisuke
2012-04-20 10:11 ` HATAYAMA Daisuke
2012-04-20 10:11 ` HATAYAMA Daisuke
2012-04-22 9:58 ` Avi Kivity
2012-04-22 9:58 ` Avi Kivity
2012-04-22 10:33 ` Gleb Natapov
2012-04-22 10:33 ` Gleb Natapov
2012-04-22 10:33 ` Gleb Natapov
2012-04-22 10:57 ` Avi Kivity
2012-04-22 10:57 ` Avi Kivity
2012-04-22 10:57 ` Avi Kivity
2012-04-17 16:49 ` Anthony Liguori
2012-04-18 12:13 ` Avi Kivity
2012-04-18 12:13 ` Avi Kivity
2012-04-18 12:13 ` Avi Kivity
2012-04-18 13:47 ` Nadav Har'El
2012-04-18 13:47 ` Nadav Har'El
2012-04-18 14:06 ` Avi Kivity
2012-04-18 14:06 ` Avi Kivity
2012-04-18 14:06 ` Avi Kivity
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