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smmu-related clarification

To: "'xen-devel@xxxxxxxxxxxxxxxxxxxx'" <xen-devel@xxxxxxxxxxxxxxxxxxxx>

From: Jorge Pereira <jorge.pereira@xxxxxxx>

Date: Thu, 19 Nov 2020 13:16:53 +0000

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Delivery-date: Thu, 19 Nov 2020 13:17:23 +0000

List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

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Thread-topic: smmu-related clarification

Hi All,

I’m having some smmu-related issues, I need help.

So, in my use-case scenario I have two linux guests running in parallel – dom0 and domU-. I have to enable the smmu because I want to passthough devices to domU.

Would be great if you help me to clarify the following questions:

if I enable SMMU, it will applies not only to domU but also to dma-capable devices assigned to dom0?
Do I have to add all smmu-masters of dom0 in device tree as well? Or since dom0 has 1:1 mapping I don’t have to do anything?

Thanks,

Jorge

Follow-Ups:

Re: smmu-related clarification
- From: Bertrand Marquis