From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Vrabel <david.vrabel@citrix.com>
Subject: Re: [RFC Patch v3 03/18] don't zero out ioreq page
Date: Fri, 5 Sep 2014 11:45:43 +0100
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To: Wen Congyang <wency@cn.fujitsu.com>, xen devel <xen-devel@lists.xen.org>
Cc: Ian Campbell <Ian.Campbell@citrix.com>, Ian Jackson <Ian.Jackson@eu.citrix.com>, Jiang Yunhong <yunhong.jiang@intel.com>, Dong Eddie <eddie.dong@intel.com>, Paul Durrant <paul.durrant@citrix.com>, Yang Hongyang <yanghy@cn.fujitsu.com>, Lai Jiangshan <laijs@cn.fujitsu.com>
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On 05/09/14 10:10, Wen Congyang wrote:
> ioreq page may contain some pending I/O requests, and we need to
> handle the pending I/O req after migration.
> 
> TODO:
> 1. update qemu to handle the pending I/O req

Under what conditions can there be pending I/O?  A domain suspend should
not complete until any I/O accesses are complete.

Suspending a domain that's part-way through an instruction seems mad to
me -- how are you supposed to capture this sort of state?

David