linux-kernel - Re: [PATCH 0/2 v3] kvm: notify host when guest panicked

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Date:	Mon, 19 Mar 2012 15:33:35 +0800
From:	Wen Congyang <wency@...fujitsu.com>
To:	kvm list <kvm@...r.kernel.org>, qemu-devel <qemu-devel@...gnu.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Avi Kivity <avi@...hat.com>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Gleb Natapov <gleb@...hat.com>
Subject: Re: [PATCH 0/2 v3] kvm: notify host when guest panicked

At 03/08/2012 03:57 PM, 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.
> 
> Another purpose of this feature 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 touch the hypervisor instead of using virtio-serial, because
> 1. it is simple
> 2. the virtio-serial is an optional device, and the guest may
>    not have such device.
> 
> Changes from v2 to v3:
> 1. correct spelling
> 
> Changes from v1 to v2:
> 1. split up host and guest-side changes
> 2. introduce new request flag to avoid changing return values.
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Hi all:

we neet this feature, but we don't decide how to implement it.
We have two solution:
1. use vmcall
2. use virtio-serial.

I will not change this patch set before we decide how to do it.
Can we make a decision recent days?

Thanks
Wen Congyang
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