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Re: [RFC PATCH 15/21] xen/arm: vsmmuv3: Emulated SMMUv3 device tree node for dom0less
- To: Rahul Singh <rahul.singh@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Michal Orzel <michal.orzel@xxxxxxx>
- Date: Fri, 2 Dec 2022 15:19:13 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Fri, 02 Dec 2022 14:19:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi Rahul,
On 01/12/2022 17:02, Rahul Singh wrote:
>
>
> XEN will create an Emulated SMMUv3 device tree node in the device tree
> to enable the dom0less domains to discover the virtual SMMUv3 during
> boot. Emulated SMMUv3 device tree node will only be created when cmdline
> option vsmmuv3 is enabled.
I think you meant viommu option.
In any case, I think that you want to introduce a device-tree property for
dom0less domU
e.g. string property viommu = "smmuv3" to control whether to add a virtual
IOMMU node or not for a given domU.
You did exactly the same for xl created domUs so you should do the same for
dom0less domUs.
Otherwise the behavior will be inconsistent and we will lack per-domain control
over virtual IOMMU.
~Michal
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