iommu: Validate that devices match domains

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Before we can allow drivers to coexist, we need to make sure that one
driver's domain ops can't misinterpret another driver's dev_iommu_priv
data. To that end, add a token to the domain so we can remember how it
was allocated - for now this may as well be the device ops, since they
still correlate 1:1 with drivers. We can trust ourselves for internal
default domain attachment, so add checks to cover all the public attach
interfaces.

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/097c6f30480e4efe12195d00ba0e84ea4837fb4c.1700589539.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Robin Murphy 2023-11-21 18:03:59 +00:00 • committed by Joerg Roedel

parent 1d8d43bb98

commit a9c362db39

3 changed files with 13 additions and 1 deletions

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10

drivers/iommu/iommu.c

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2

drivers/iommu/iommufd/hw_pagetable.c

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2

include/linux/iommu.h

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