Messages in this thread | | | Subject | Re: [PATCH 4/6] iommu: Combine device strictness requests with the global default | From | Lu Baolu <> | Date | Tue, 22 Jun 2021 10:03:45 +0800 |
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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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