From: Liu Yi L yi.l.liu@intel.com
[ Upstream commit 423d39d8518c1bba12e0889a92beeddbb1502392 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iommu/intel/pasid.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c index fb911b6c418f..6db3400df484 100644 --- a/drivers/iommu/intel/pasid.c +++ b/drivers/iommu/intel/pasid.c @@ -523,6 +523,10 @@ 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) @@ -558,6 +562,10 @@ 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: */ @@ -654,6 +662,10 @@ 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); @@ -693,6 +705,10 @@ 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);