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-rw-r--r--Documentation/admin-guide/kernel-parameters.txt9
1 files changed, 5 insertions, 4 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 0a1731a0f0ef..14f56c448edc 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2220,7 +2220,7 @@
forcing Dual Address Cycle for PCI cards supporting
greater than 32-bit addressing.
- iommu.strict= [ARM64, X86] Configure TLB invalidation behaviour
+ iommu.strict= [ARM64, X86, S390] Configure TLB invalidation behaviour
Format: { "0" | "1" }
0 - Lazy mode.
Request that DMA unmap operations use deferred
@@ -5611,9 +5611,10 @@
s390_iommu= [HW,S390]
Set s390 IOTLB flushing mode
strict
- With strict flushing every unmap operation will result in
- an IOTLB flush. Default is lazy flushing before reuse,
- which is faster.
+ With strict flushing every unmap operation will result
+ in an IOTLB flush. Default is lazy flushing before
+ reuse, which is faster. Deprecated, equivalent to
+ iommu.strict=1.
s390_iommu_aperture= [KNL,S390]
Specifies the size of the per device DMA address space