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iommu/vt-d: Prepare for set_dev_pasid callback

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The domain_flush_pasid_iotlb() helper function is used to flush the IOTLB
entries for a given PASID. Previously, this function assumed that
RID2PASID was only used for the first-level DMA translation. However, with
the introduction of the set_dev_pasid callback, this assumption is no
longer valid.

Add a check before using the RID2PASID for PASID invalidation. This check
ensures that the domain has been attached to a physical device before
using RID2PASID.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20230802212427.1497170-7-jacob.jun.pan@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2023-08-09 20:47:59 +08:00 committed by Joerg Roedel
parent 154786235d
commit 37f900e718
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/intel/iommu.c
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@ -1475,7 +1475,8 @@ static void domain_flush_pasid_iotlb(struct intel_iommu *iommu,
unsigned long flags;
spin_lock_irqsave(&domain->lock, flags);
qi_flush_piotlb(iommu, did, IOMMU_NO_PASID, addr, npages, ih);
if (!list_empty(&domain->devices))
qi_flush_piotlb(iommu, did, IOMMU_NO_PASID, addr, npages, ih);
spin_unlock_irqrestore(&domain->lock, flags);
}