Re: [PATCH v2 13/15] iommu/amd: Use the generic iommu page table

On 05-05-2025 19:48, Jason Gunthorpe wrote:

• /*

• * AMD's IOMMU can flush as many pages as necessary in a single flush.
  

• * Unless we run in a virtual machine, which can be inferred according
  

• * to whether "non-present cache" is on, it is probably best to prefer
  

• * (potentially) too extensive TLB flushing (i.e., more misses) over
  

• * mutliple TLB flushes (i.e., more flushes). For virtual machines the
  

old typo mutliple -> multiple

• * hypervisor needs to synchronize the host IOMMU PTEs with those of
  

• * the guest, and the trade-off is different: unnecessary TLB flushes
  

• * should be avoided.
  

• */
  

Thanks, Alok