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iommu: Add iommu_group_has_isolated_msi()

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Compute the isolated_msi over all the devices in the IOMMU group because
iommufd and vfio both need to know that the entire group is isolated
before granting access to it.

Link: https://lore.kernel.org/r/2-v3-3313bb5dd3a3+10f11-secure_msi_jgg@nvidia.com
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Jason Gunthorpe
2022-12-09 13:23:08 -04:00
parent 17cde5e601
commit efc30a8f15
2 changed files with 27 additions and 0 deletions
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include/linux/iommu.h
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@@ -455,6 +455,7 @@ static inline const struct iommu_ops *dev_iommu_ops(struct device *dev)
extern int bus_iommu_probe(struct bus_type *bus);
extern bool iommu_present(struct bus_type *bus);
extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap);
extern bool iommu_group_has_isolated_msi(struct iommu_group *group);
extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
extern struct iommu_group *iommu_group_get_by_id(int id);
extern void iommu_domain_free(struct iommu_domain *domain);