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 10:40 AM, Ian Campbell wrote:

> We really need to be able to manage this transition in a compatible way,
> that means new kernels working on old hypervisors as well as old kernels
> working on new hypervisors (it's obviously fine for this case to bounce
> when it doesn't need to).

It's not possible because a same platform can have both protected and
non-protected devices. The Linux has to know in some way if the DMA has
to be program with IPA or PA.

The only way is to disable the IOMMU, or don't use partition disk for
guest, until the DOM0 will be able to disable swiotlb.

-- 
Julien Grall

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