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Re: [PATCH v3 1/2] dt-bindings: arm: xen: document Xen iommu device
- To: "sstabellini@xxxxxxxxxx" <sstabellini@xxxxxxxxxx>
- From: Oleksii Moisieiev <Oleksii_Moisieiev@xxxxxxxx>
- Date: Thu, 4 May 2023 09:33:10 +0000
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- Cc: Sergiy Kibrik <Sergiy_Kibrik@xxxxxxxx>, "devicetree@xxxxxxxxxxxxxxx" <devicetree@xxxxxxxxxxxxxxx>, "julien@xxxxxxx" <julien@xxxxxxx>, "linux-arm-kernel@xxxxxxxxxxxxxxxxxxx" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, "olekstysh@xxxxxxxxx" <olekstysh@xxxxxxxxx>, "robh@xxxxxxxxxx" <robh@xxxxxxxxxx>, "robin.murphy@xxxxxxx" <robin.murphy@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 04 May 2023 09:33:43 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH v3 1/2] dt-bindings: arm: xen: document Xen iommu device
Hi Stefano,
> The tiny "xen,iommu-el2-v1" driver could be backported to the stable
> trees, I would imagine. Otherwise, do you have another suggestion?
There is stub IOMMU driver already merged to the Linux Kernel:
Commit 1ca55d50e50c74747a7b8846dac306fbe5ac4cf5 ("xen/grant-dma-iommu:
Introduce stub IOMMU driver" added by Oleksandr Tyshchenko.
I was able to use it as an empty IOMMU driver on my test setup:
Made the following device-tree changes:
xen_iommu: xen-iommu {
compatible = "xen,grant-dma";
iommu-cells = <0>;
};
i2c@e60b0000 {
iommus = <&xen_iommu 0x0>;
};
Maybe this driver can be used to solve the deferred problem with some
modifications?
What is your opinion?
Best regards,
Oleksii.
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