From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [PATCH v7 08/18] tools/libxl: introduce
 libxl__domain_restore_device_model to load qemu state
Date: Fri, 29 Jan 2016 11:34:11 -0500
Message-ID: <20160129163411.GI22787@char.us.oracle.com>
References: <1454045254-3711-1-git-send-email-wency@cn.fujitsu.com>
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To: Wen Congyang <wency@cn.fujitsu.com>
Cc: Lars Kurth <lars.kurth@citrix.com>, Changlong Xie <xiecl.fnst@cn.fujitsu.com>, Wei Liu <wei.liu2@citrix.com>, Ian Campbell <ian.campbell@citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Jiang Yunhong <yunhong.jiang@intel.com>, Dong Eddie <eddie.dong@intel.com>, xen devel <xen-devel@lists.xen.org>, Anthony Perard <anthony.perard@citrix.com>, Gui Jianfeng <guijianfeng@cn.fujitsu.com>, Shriram Rajagopalan <rshriram@cs.ubc.ca>, Ian Jackson <ian.jackson@eu.citrix.com>, Yang Hongyang <hongyang.yang@easystack.cn>
List-Id: xen-devel@lists.xenproject.org

On Fri, Jan 29, 2016 at 01:27:24PM +0800, Wen Congyang wrote:
> In normal migration, the qemu state is passed to qemu as a parameter.
> With COLO, secondary vm is running. So we will do the following steps
> at every checkpoint:
> 1. suspend both primary vm and secondary vm
> 2. sync the state
> 3. resume both primary vm and secondary vm
> Primary will send qemu's state in step2, and secondary's qemu should
> read it and restore the state before it is resumed. We can not pass
> the state to qemu as a parameter because secondary QEMU already started
> at this point, so we introduce libxl__domain_restore_device_model() to
> do it. This API MUST be called before resuming secondary vm.
> 
> Signed-off-by: Yang Hongyang <hongyang.yang@easystack.cn>
> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
> Cc: Anthony Perard <anthony.perard@citrix.com>

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>