Re: [Xen-devel] [RFC] [Draft Design v2] ACPI/IORT Support in Xen.

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 16/11/17 07:39, Manish Jaggi wrote:
> On 11/14/2017 6:53 PM, Julien Grall wrote:
> > > 3. IORT for Dom0
> > > -----------------
> > > IORT for Dom0 is based on host iort. Few nodes could be removed or 
> > > modified.
> > >   For instance
> > > - Host SMMU nodes should not be present as Xen should only touch it.
> > > - platform nodes (named components) may be controlled by xen command 
> > > line.
> > I am not sure where does this example come from? As I said, there are 
> > no plan to support Platform Device passthrough with ACPI. A better 
> > example here would removing PMCG.
> It came from review comments on my previous IORT SMMU hiding patch. 
> Andre suggested that Platform Nodes are needed.
> After some brainstorming with Julien we found two problems:
> 1) This only covers RC nodes, but not "named components" (platform
> devices), which we will need. ...
>
> From: https://www.mail-archive.com/xen-devel@xxxxxxxxxxxxx/msg123434.html
I think you misunderstood my comment here... What I call "device 
passthrough" is giving access to a device to a domain other than the 
Hardware Domain
There are no plan for supporting platform device-passthrough on ACPI and 
I don't understand why you would like to control that using the command 
line.
What Andre was saying is your series was not covering the "named 
components" for the Hardware Domain.
Cheers,

--
Julien Grall

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