linux-kernel - Re: [PATCH] kvm: notify host when guest paniced

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20120229095557.GE24600@redhat.com>
Date:	Wed, 29 Feb 2012 11:55:57 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Wen Congyang <wency@...fujitsu.com>,
	kvm list <kvm@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	linux-kernel@...r.kernel.org, qemu-devel <qemu-devel@...gnu.org>
Subject: Re: [PATCH] kvm: notify host when guest paniced

On Wed, Feb 29, 2012 at 11:49:58AM +0200, Avi Kivity wrote:
> On 02/29/2012 03:29 AM, Wen Congyang wrote:
> > At 02/28/2012 07:23 PM, Avi Kivity Wrote:
> > > On 02/27/2012 05:01 AM, Wen Congyang wrote:
> > >> We can know the guest is paniced when the guest runs on xen.
> > >> But we do not have such feature on kvm. This patch implemnts
> > >> this feature, and the implementation is the same as xen:
> > >> register panic notifier, and call hypercall when the guest
> > >> is paniced.
> > > 
> > > What's the motivation for this?  "Xen does this" is insufficient.
> >
> > Another purpose is: management app(for example: libvirt) can do auto
> > dump when the guest is crashed. If management app does not do auto
> > dump, the guest's user can do dump by hand if he sees the guest is
> > paniced.
> >
> > I am thinking about another status: dumping. This status tells
> > the guest's user that the guest is paniced, and the OS's dump function
> > is working.
> >
> > These two status can tell the guest's user whether the guest is pancied,
> > and what should he do if the guest is paniced.
> >
> 
> How about using a virtio-serial channel for this?  You can transfer any
> amount of information (including the dump itself).
> 
Isn't it unreliable after the guest panicked? Having special kdump
kernel that transfers dump to a host via virtio-serial channel though
sounds interesting. May be that's what you mean.

--
			Gleb.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/