Re: [Xen-devel] [PATCH v4 20/21] drivers/passthrough: arm: Add support for SMMU drivers

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2014-04-22 at 14:14 +0100, Julien Grall wrote:
> This patch add support for ARM architected SMMU driver. It's based on the
> linux drivers (drivers/iommu/arm-smmu) commit 89ac23cd.
> 
> The major differences with the Linux driver are:
>     - Fault by default if the SMMU is enabled to translate an
>     address (Linux is bypassing the SMMU)
>     - Using P2M page table instead of creating new one
>     - Dropped stage-1 support
>     - Dropped chained SMMUs support for now
>     - Reworking device assignment and the different structures
> 
> Xen is programming each IOMMU by:
>     - Using stage-2 mode translation
>     - Sharing the page table with the processor
>     - Injecting a fault if the device has made a wrong translation
> 
> Signed-off-by: Julien Grall<julien.grall@xxxxxxxxxx>
> Cc: Xiantao Zhang <xiantao.zhang@xxxxxxxxx>
> Cc: Jan Beulich <jbeulich@xxxxxxxx>

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



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