Re: [Xen-devel] [PATCH v3 12/13] xen/arm: Add the property "protected-devices" in the hypervisor node

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 04/04/2014 12:13 PM, Ian Campbell wrote:
> We could enable both of those things only at the point where vm_assist
> was called.

[..]

> I think we can reasonably require that vm_assist be called super early,
> i.e. before any DMA operations occur, in Linux terms I think
> early_initcall(xen_guest_init) is likely early enough, or we could move
> xen_guestr_init even sooner.

IHMO, this solution is far too complicate and we will have to fork from
the current IOMMU framework.

> We also have the option of a build time feature flag in the image itself
> like on x86. It is likely that going forward we will have other cases
> where we wished we had such a thing so getting it in place now would be
> useful.

I definitely prefer this solution which seems more cleaner than the others.

Is it possible to embedded notes in a zImage? How x86 handle other
format than ELF?

> 
>> It's not possible in Xen to know if the decide is used or not.
> 
> "the decide"?

The device, I mixed multiple sentences together, sorry.

-- 
Julien Grall

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