Re: [Xen-devel] [PATCH V1 18/29] xen/arm: Don't map disabled device in DOM0

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2013-09-09 at 22:59 +0100, Julien Grall wrote:
> On 09/09/2013 12:40 PM, Ian Campbell wrote:
> > On Wed, 2013-08-28 at 15:47 +0100, Julien Grall wrote:
> >> Linux should cope with 'status = "disabled"' in the Device Tree.
> >
> > This is devices which were disabled in the DT passed to Xen, rather than
> > ones which we have disabled ourselves (e.g. the previous patch)?
> 
> Yes.
> 
> 
> >> This solution can be used later to pass-through device to a specific guest.
> >
> > How? I thought disabled meant "not present/wired-up on this variant of
> > the platform"? A user cannot be expected to edit the host DTB to enable
> > passthrough. We might want a dtb_hide cmdline option, or to do it
> > dynamically like pciback is capable of.
> 
> Disabled also means "the device is not presently operational, but it 
> might become operational in the future".
> 
> > Or maybe I'm wrong above and this is indeed devices we have disabled
> > ourselves?
> 
> I'm not sure it's usefull. But I don't see any reason to map disabled 
> device in dom0.

Agreed, I just think the reference to passthrough in the changelog is
not relevant to this and might not be accurate.

Ian.


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