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iommu/vt-d: Add present bit check in pasid entry setup helpers

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The helper functions should not modify the pasid entries which are still
in use. Add a check against present bit.

Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20210817042425.1784279-1-yi.l.liu@intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210818134852.1847070-10-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Liu Yi L
2021-08-18 21:48:52 +08:00
committed by Joerg Roedel
parent 8123b0b868
commit 423d39d851
1 changed files with 16 additions and 0 deletions
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16
drivers/iommu/intel/pasid.c
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@@ -534,6 +534,10 @@ void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev,
devtlb_invalidation_with_pasid(iommu, dev, pasid);
}
/*
* This function flushes cache for a newly setup pasid table entry.
* Caller of it should not modify the in-use pasid table entries.
*/
static void pasid_flush_caches(struct intel_iommu *iommu,
struct pasid_entry *pte,
u32 pasid, u16 did)
@@ -585,6 +589,10 @@ int intel_pasid_setup_first_level(struct intel_iommu *iommu,
if (WARN_ON(!pte))
return -EINVAL;
/* Caller must ensure PASID entry is not in use. */
if (pasid_pte_is_present(pte))
return -EBUSY;
pasid_clear_entry(pte);
/* Setup the first level page table pointer: */
@@ -684,6 +692,10 @@ int intel_pasid_setup_second_level(struct intel_iommu *iommu,
return -ENODEV;
}
/* Caller must ensure PASID entry is not in use. */
if (pasid_pte_is_present(pte))
return -EBUSY;
pasid_clear_entry(pte);
pasid_set_domain_id(pte, did);
pasid_set_slptr(pte, pgd_val);
@@ -723,6 +735,10 @@ int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
return -ENODEV;
}
/* Caller must ensure PASID entry is not in use. */
if (pasid_pte_is_present(pte))
return -EBUSY;
pasid_clear_entry(pte);
pasid_set_domain_id(pte, did);
pasid_set_address_width(pte, iommu->agaw);