iommu/vt-d: Check domain force_snooping against attached devices

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As domain->force_snooping only impacts the devices attached with the
domain, there's no need to check against all IOMMU units. On the other
hand, force_snooping could be set on a domain no matter whether it has
been attached or not, and once set it is an immutable flag. If no
device attached, the operation always succeeds. Then this empty domain
can be only attached to a device of which the IOMMU supports snoop
control.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20220508123525.1973626-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20220510023407.2759143-7-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Lu Baolu 2022-05-10 10:34:05 +08:00 • committed by Joerg Roedel

parent 9d6ab26a75

commit fc0051cb95

4 changed files with 95 additions and 3 deletions

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53

drivers/iommu/intel/iommu.c

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42

drivers/iommu/intel/pasid.c

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2

drivers/iommu/intel/pasid.h

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1

include/linux/intel-iommu.h

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