forcing Dual Address Cycle for PCI cards supporting
greater than 32-bit addressing.
- iommu.strict= [ARM64] Configure TLB invalidation behaviour
+ iommu.strict= [ARM64, X86] Configure TLB invalidation behaviour
Format: { "0" | "1" }
0 - Lazy mode.
Request that DMA unmap operations use deferred
1 - Strict mode (default).
DMA unmap operations invalidate IOMMU hardware TLBs
synchronously.
+ Note: on x86, the default behaviour depends on the
+ equivalent driver-specific parameters, but a strict
+ mode explicitly specified by either method takes
+ precedence.
iommu.passthrough=
[ARM64, X86] Configure DMA to bypass the IOMMU by default.