Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755302Ab2JaBdD (ORCPT ); Tue, 30 Oct 2012 21:33:03 -0400 Received: from mx1.redhat.com ([209.132.183.28]:2751 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752534Ab2JaBdA (ORCPT ); Tue, 30 Oct 2012 21:33:00 -0400 Date: Tue, 30 Oct 2012 23:12:56 -0200 From: Marcelo Tosatti To: Hu Tao Cc: kvm list , qemu-devel , "linux-kernel@vger.kernel.org" , Avi Kivity , "Daniel P. Berrange" , KAMEZAWA Hiroyuki , Jan Kiszka , Gleb Natapov , Blue Swirl , Eric Blake , Andrew Jones , Sasha Levin , Luiz Capitulino , Wen Congyang Subject: Re: [PATCH v11] kvm: notify host when the guest is panicked Message-ID: <20121031011256.GC12325@amt.cnet> References: <0a2274eccf1b1dd420f16359f7e1de74fa2f9fbe.1351131144.git.hutao@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0a2274eccf1b1dd420f16359f7e1de74fa2f9fbe.1351131144.git.hutao@cn.fujitsu.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1202 Lines: 31 On Thu, Oct 25, 2012 at 11:42:32AM +0800, Hu Tao wrote: > We can know the guest is panicked 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 panicked. If management > app does not do auto dump, the guest's user can do dump by hand if > he sees the guest is panicked. > > We have three solutions to implement this feature: > 1. use vmcall > 2. use I/O port > 3. use virtio-serial. > > We have decided to avoid touching hypervisor. The reason why I choose > choose the I/O port is: > 1. it is easier to implememt > 2. it does not depend any virtual device > 3. it can work when starting the kernel It has been asked earlier why a simple virtio device is not usable for this (with no response IIRC). Also, there is no high level documentation: purpose of the interface, how a management application should use it, etc. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/