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iommu/vt-d: Clear Present bit before tearing down PASID entry

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The Intel VT-d Scalable Mode PASID table entry consists of 512 bits (64
bytes). When tearing down an entry, the current implementation zeros the
entire 64-byte structure immediately using multiple 64-bit writes.

Since the IOMMU hardware may fetch these 64 bytes using multiple
internal transactions (e.g., four 128-bit bursts), updating or zeroing
the entire entry while it is active (P=1) risks a "torn" read. If a
hardware fetch occurs simultaneously with the CPU zeroing the entry, the
hardware could observe an inconsistent state, leading to unpredictable
behavior or spurious faults.

Follow the "Guidance to Software for Invalidations" in the VT-d spec
(Section 6.5.3.3) by implementing the recommended ownership handshake:

1. Clear only the 'Present' (P) bit of the PASID entry.
2. Use a dma_wmb() to ensure the cleared bit is visible to hardware
   before proceeding.
3. Execute the required invalidation sequence (PASID cache, IOTLB, and
   Device-TLB flush) to ensure the hardware has released all cached
   references.
4. Only after the flushes are complete, zero out the remaining fields
   of the PASID entry.

Also, add a dma_wmb() in pasid_set_present() to ensure that all other
fields of the PASID entry are visible to the hardware before the Present
bit is set.

Fixes: 0bbeb01a4f ("iommu/vt-d: Manage scalalble mode PASID tables")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Dmytro Maluka <dmaluka@chromium.org>
Reviewed-by: Samiullah Khawaja <skhawaja@google.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20260120061816.2132558-2-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Lu Baolu 2026-01-22 09:48:54 +08:00 • committed by Joerg Roedel
parent 04b1b069f1
commit 75ed00055c
2 changed files with 19 additions and 1 deletions
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6
drivers/iommu/intel/pasid.c
View file

@ -273,7 +273,7 @@ void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev,
did = pasid_get_domain_id(pte);
pgtt = pasid_pte_get_pgtt(pte);
intel_pasid_clear_entry(dev, pasid, fault_ignore);
pasid_clear_present(pte);
spin_unlock(&iommu->lock);
if (!ecap_coherent(iommu->ecap))
@ -287,6 +287,10 @@ void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev,
iommu->flush.flush_iotlb(iommu, did, 0, 0, DMA_TLB_DSI_FLUSH);
devtlb_invalidation_with_pasid(iommu, dev, pasid);
intel_pasid_clear_entry(dev, pasid, fault_ignore);
if (!ecap_coherent(iommu->ecap))
clflush_cache_range(pte, sizeof(*pte));
if (!fault_ignore)
intel_iommu_drain_pasid_prq(dev, pasid);
}

14
drivers/iommu/intel/pasid.h
View file

@ -234,9 +234,23 @@ static inline void pasid_set_wpe(struct pasid_entry *pe)
*/
static inline void pasid_set_present(struct pasid_entry *pe)
{
dma_wmb();
pasid_set_bits(&pe->val[0], 1 << 0, 1);
}
/*
* Clear the Present (P) bit (bit 0) of a scalable-mode PASID table entry.
* This initiates the transition of the entry's ownership from hardware
* to software. The caller is responsible for fulfilling the invalidation
* handshake recommended by the VT-d spec, Section 6.5.3.3 (Guidance to
* Software for Invalidations).
*/
static inline void pasid_clear_present(struct pasid_entry *pe)
{
pasid_set_bits(&pe->val[0], 1 << 0, 0);
dma_wmb();
}
/*
* Setup Page Walk Snoop bit (Bit 87) of a scalable mode PASID
* entry.