Re: [PATCH v6 03/11] xen/arm: Allow device-passthrough even the IOMMU is off

[Julien Grall <julien@xxxxxxx>]

Hi,

On 14/02/2022 03:19, Penny Zheng wrote:
> From: Stefano Stabellini <sstabellini@xxxxxxxxxx>
>
> At the moment, we are only supporting device-passthrough when Xen has
> enabled the IOMMU. There are some use cases where it is not possible to
> use the IOMMU (e.g. doesn't exist, hardware limitation, performance) yet
> it would be OK to assign a device to trusted domain so long they are
> direct-mapped or the device doesn't do DMA.
>
> Note that when the IOMMU is disabled, it will be necessary to add
> xen,force-assign-without-iommu for every device that needs to be assigned.
>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
> Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx>
> Tested-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Acked-by: Julien Grall <jgrall@xxxxxxxxxx>

Cheers,

--
Julien Grall