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authorLiu Yi L <yi.l.liu@intel.com>2021-08-18 21:48:52 +0800
committerJoerg Roedel <jroedel@suse.de>2021-08-19 10:41:08 +0200
commit423d39d8518c1bba12e0889a92beeddbb1502392 (patch)
treeef54fe6af710ec6ff82fc2f5da02c12e59b5c350 /drivers/iommu
parent8123b0b86855185357e4b12f29e327ba773fc58d (diff)
iommu/vt-d: Add present bit check in pasid entry setup helpers
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>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/intel/pasid.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c
index 02e10491184b..b1d0c2945c9a 100644
--- a/drivers/iommu/intel/pasid.c
+++ b/drivers/iommu/intel/pasid.c
@@ -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);