Re: [Xen-devel] [RFC PATCH 3/3] tools, libxl: handle the iomem parameter with the memory_mapping hcall

[Julien Grall <julien.grall@xxxxxxxxxx>]

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

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