From mboxrd@z Thu Jan  1 00:00:00 1970
From: George Dunlap <george.dunlap@eu.citrix.com>
Subject: Re: GPU passthrough issue when VM is configured with 4G
 memory
Date: Mon, 20 May 2013 12:29:32 +0100
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To: Hanweidong <hanweidong@huawei.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>, "xudong.hao@intel.com" <xudong.hao@intel.com>, Yanqiangjun <yanqiangjun@huawei.com>, Luonengjun <luonengjun@huawei.com>, Wangzhenguo <wangzhenguo@huawei.com>, Yangxiaowei <xiaowei.yang@huawei.com>, "Gonglei (Arei)" <arei.gonglei@huawei.com>, Anthony Perard <anthony.perard@citrix.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>, "xiantao.zhang@intel.com" <xiantao.zhang@intel.com>
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On 17/05/13 08:10, Hanweidong wrote:
> Actually, it's not really related to GPU passthrough. You can reproduce it when a VM has a big pci hole size (such as 512MB), e.g. create a VM with a virtual device which has a 512MB pci BAR.

It seems like this is probably an artchitectural thing that will require 
someone familiar with qemu to sort out.  Anthony and Stefano, could one 
of you two step up to getting it sorted by 4.3?

  -George