Re: [Xen-devel] [PATCH v4 06/33] xen/arm: Introduce xen, passthrough property

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Thu, 2015-03-19 at 19:29 +0000, Julien Grall wrote:
> When a device is marked for passthrough (via the new property
> "xen,passthrough"), dom0 must not access to the device (i.e not
> loading a driver), but should be able to manage the MMIO/interrupt
> of the passthrough device.
> 
> The latter part will allow the toolstack to map MMIO/IRQ when a device
> is pass through to a guest.
> 
> The property "xen,passthrough" will be translated as 'status="disabled"'
> in the device tree to avoid DOM0 using the device. We assume that DOM0 is
> able to cope with this property (already the case for Linux, and
> required by ePAPR).
> 
> Rework the function map_device (renamed into handle_device) to:
> 
> * For a given device node:
>     - Give permission to manage IRQ/MMIO for this device
>     - Retrieve the IRQ configuration (i.e edge/level) from the device
>     tree
> * When the device is not marked for guest passthrough:
>     - Assign the device to the guest if it's protected by an IOMMU
>     - Map the IRQs and MMIOs regions to the guest
> 
> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
> Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>



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