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Date: Thu, 14 Mar 2013 17:46:22 +0800
From: Hu Tao <hutao@cn.fujitsu.com>
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Subject: Re: [Qemu-devel] [PATCH v14 3/4] introduce pvevent device to deal
 with panicked event
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Maydell <peter.maydell@linaro.org>, Gleb Natapov <gleb@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, Jan Kiszka <jan.kiszka@siemens.com>, qemu-devel <qemu-devel@nongnu.org>, Markus Armbruster <armbru@redhat.com>, Blue Swirl <blauwirbel@gmail.com>, Orit Wasserman <owasserm@redhat.com>, Juan Quintela <quintela@redhat.com>, Alexander Graf <agraf@suse.de>, Christian Borntraeger <borntraeger@de.ibm.com>, Andrew Jones <drjones@redhat.com>, Alex Williamson <alex.williamson@redhat.com>, Sasha Levin <levinsasha928@gmail.com>, Stefan Hajnoczi <stefanha@redhat.com>, Luiz Capitulino <lcapitulino@redhat.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Kevin Wolf <kwolf@redhat.com>, Anthony Liguori <aliguori@us.ibm.com>, Marcelo Tosatti <mtosatti@redhat.com>

On Thu, Mar 14, 2013 at 10:14:12AM +0100, Paolo Bonzini wrote:
> Il 14/03/2013 09:15, Hu Tao ha scritto:
> > pvevent device is used to send guest panic event from guest to qemu.
> > 
> > When guest panic happens, pvevent device driver will write a event
> > number to IO port 0x505(which is the IO port occupied by pvevent device,
> > by default). On receiving the event, pvevent device will pause guest
> > cpu(s), and send a qmp event QEVENT_GUEST_PANICKED.  
> > 
> > TODO: make the IO port configurable
> 
> The port is already configurable as far as the device is concerned; when
> you add the port to the PC boards you will have to wind up fw-cfg.

Yes, by configurable, I mean to pass io port through fw-cfg to seabios
and patch it.