From mboxrd@z Thu Jan  1 00:00:00 1970
From: Shannon Zhao <shannon.zhao@linaro.org>
Subject: Re: Design doc of adding ACPI support for arm64 on Xen
 - version 5
Date: Sat, 29 Aug 2015 09:00:28 +0800
Message-ID: <55E1042C.6000308@linaro.org>
References: <55E02DC5.4090202@huawei.com> <55E05A2F.1090305@citrix.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <55E05A2F.1090305@citrix.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Julien Grall <julien.grall@citrix.com>, Shannon Zhao <zhaoshenglong@huawei.com>, xen-devel <xen-devel@lists.xen.org>, Christoffer Dall <christoffer.dall@linaro.org>, Ian Campbell <ian.campbell@citrix.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Stefano Stabellini <stefano.stabellini@citrix.com>, Jan Beulich <jbeulich@suse.com>, Parth Dixit <parth.dixit@linaro.org>, andrew@fubar.geek.nz, Boris Ostrovsky <boris.ostrovsky@oracle.com>, David Vrabel <david.vrabel@citrix.com>, Roger Pau Monne <roger.pau@citrix.com>
Cc: Hangaohuai <hangaohuai@huawei.com>, "Huangpeng (Peter)" <peter.huangpeng@huawei.com>
List-Id: xen-devel@lists.xenproject.org

Hi Julien,

On 2015/8/28 20:55, Julien Grall wrote:
> Hi Shannon,
> 
> On 28/08/15 10:45, Shannon Zhao wrote:
>> 2. Copy and change some EFI and ACPI tables
>> -------------------------------------------
> 
> [..]
> 
>> All above tables will be mapped to Dom0 non-RAM space(e.g. the space
>> after Dom0 RAM).
> 
> If I understand correctly what you are saying, you plan to put the
> tables just after the Dom0 RAM bank. Although, there can be multiple
> banks and how can you be so sure that there will be no MMIO at this place?
> 
> 

Currently I use the last RAM bank(kinfo->mem.bank[nr_banks - 1]) to
calculate the start address of non-RAM place. I'm not sure there will be
no MMIO at that place. Do you have any good idea to find such sure and
safe non-ram place?

Thanks,
-- 
Shannon