linux-kernel - Re: [PATCH v11] kvm: notify host when the guest is panicked

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Message-ID: <CA+1xoqd60YihExEuSU2qzsyFRXLS=XaeeX9AaMLhPHggfM6V3A@mail.gmail.com>
Date:	Fri, 9 Nov 2012 15:17:39 -0500
From:	Sasha Levin <levinsasha928@...il.com>
To:	Hu Tao <hutao@...fujitsu.com>
Cc:	Wen Congyang <wency@...fujitsu.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	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>,
	Blue Swirl <blauwirbel@...il.com>,
	Eric Blake <eblake@...hat.com>,
	Andrew Jones <drjones@...hat.com>,
	Luiz Capitulino <lcapitulino@...hat.com>
Subject: Re: [PATCH v11] kvm: notify host when the guest is panicked

On Mon, Nov 5, 2012 at 8:58 PM, Hu Tao <hutao@...fujitsu.com> wrote:
> But in the case of panic notification, more dependency means more
> chances of failure of panic notification. Say, if we use a virtio device
> to do panic notification, then we will fail if: virtio itself has
> problems, virtio for some reason can't be deployed(neither built-in or
> as a module), or guest doesn't support virtio, etc.

Add polling to your virtio device. If it didn't notify of a panic but
taking more than 20 sec to answer your poll request you can assume
it's dead.

Actually, just use virtio-serial and something in userspace on the guest.

> We choose IO because compared to virtio device, it is not that heavy and
> less problematic.

Less problematic? Heavy? Are there any known issues with virtio that
should be fixed? You make virtio sound like an old IDE drive or
something.


Thanks,
Sasha
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