From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@linaro.org>
Subject: Re: [RFC PATCH 3/3] tools,
 libxl: handle the iomem parameter with the memory_mapping hcall
Date: Fri, 07 Mar 2014 12:03:30 +0800
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To: Arianna Avanzini <avanzini.arianna@gmail.com>, Dario Faggioli <dario.faggioli@citrix.com>, Ian Campbell <ian.campbell@citrix.com>
Cc: paolo.valente@unimore.it, stefano.stabellini@eu.citrix.com, Ian Jackson <Ian.Jackson@eu.citrix.com>, xen-devel@lists.xen.org, julien.grall@citrix.com, etrudeau@broadcom.com, viktor.kleinik@globallogic.com
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Hello Arianna,

On 07/03/14 08:45, Arianna Avanzini wrote:
>>
>> I think Arianna solution's might not work if the 1:1 mapping clash with existing
>> layout. I might help Arianna on this subject because it will be useful to
>> passthrough a device to the guest.
>>
>
> Sorry for the delay and for bothering you with another question. In order to
> ensure that the 1:1 mapping of a new range of I/O memory does not clash with the
> existing layout, we should then check that nothing else has been mapped to that
> address range in the domU's address space?

I think checking is not the right solution, what will you do if the 
range is effectively clash to another one?

On a previous mail (see 
http://lists.xenproject.org/archives/html/xen-devel/2014-03/msg00036.html), 
Ian has proposed to exposed the layout of the host to the guest. That 
will allow you to map the memory in 1:1.

I will need this item for device passthrough soon. I can take care of 
this item if you want.

Regards,

-- 
Julien Grall