Re: [Xen-devel] [PATCH v9 5/8] xen/arm: assign devices to boot domains

[Julien Grall <julien.grall@xxxxxxx>]

Hi Stefano,

On 04/10/2019 02:14, Stefano Stabellini wrote:
> Scan the user provided dtb fragment at boot. For each device node, map
> memory to guests, and route interrupts and setup the iommu.
>
> The memory region to remap is specified by the "xen,reg" property.
>
> The iommu is setup by passing the node of the device to assign on the
> host device tree. The path is specified in the device tree fragment as
> the "xen,path" string property.
>
> The interrupts are remapped based on the information from the
> corresponding node on the host device tree. Call
> handle_device_interrupts to remap interrupts. Interrupts related device
> tree properties are copied from the device tree fragment, same as all
> the other properties.
>
> Require both xen,reg and xen,path to be present, unless
> xen,force-assign-without-iommu is also set. In that case, tolerate a
> missing xen,path, also tolerate iommu setup failure for the passthrough
> device.
>
> Also set add the new flag XEN_DOMCTL_CDF_iommu so that dom0less domU
> can use the IOMMU if a partial dtb is specified.
>
> Signed-off-by: Stefano Stabellini <stefanos@xxxxxxxxxx>
Reviewed-by: Julien Grall <julien.gralL@xxxxxxx>

Cheers,

--
Julien Grall

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