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SubjectRe: [PATCH 4/6] iommu: Combine device strictness requests with the global default
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On 6/22/21 7:52 AM, Douglas Anderson wrote:
> @@ -1519,7 +1542,8 @@ static int iommu_get_def_domain_type(struct device *dev)
>
> static int iommu_group_alloc_default_domain(struct bus_type *bus,
> struct iommu_group *group,
> - unsigned int type)
> + unsigned int type,
> + struct device *dev)
> {
> struct iommu_domain *dom;
>
> @@ -1534,6 +1558,12 @@ static int iommu_group_alloc_default_domain(struct bus_type *bus,
> if (!dom)
> return -ENOMEM;
>
> + /* Save the strictness requests from the device */
> + if (dev && type == IOMMU_DOMAIN_DMA) {
> + dom->request_non_strict = dev->request_non_strict_iommu;
> + dom->force_strict = dev->force_strict_iommu;
> + }
> +

An iommu default domain might be used by multiple devices which might
have different "strict" attributions. Then who could override who?

Best regards,
baolu

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