Re: [Xen-devel] [PATCH 0/2] Dangling fixes for ARM iommu

[Andrii Anisov <andrii.anisov@xxxxxxxxx>]

On 23.01.19 20:14, Julien Grall wrote:
> I can queue the first hunk for Xen 4.13.
For 4.13? Well I hope we will manage to upstream the whole series until then.

> This statement is only correct if the IOMMU has been actively blacklisted by 
> Xen. In the case of the SMMU driver, this is done by arm_smmu_dt_init(). The 
> function is only called when the IOMMU has been enabled.
>
> So if you pass "iommu=disabled" to Xen commandline, the SMMU will be accessible 
> by Dom0.
>
> When there are no drivers for the IOMMU used, then you end up to assign the 
> IOMMU to Dom0. This means that Dom0 can use them.
>
> It does not make sense to remove the properties "iommus", "iommu-map", 
> "iommu-map-mask" if Dom0 is already touching the IOMMU. It is either everything or nothing.
So that patch should be totally rewritten. At least to support iommu=disabled.

--
Sincerely,
Andrii Anisov.

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