title: KVM - DMA with a passthrough device
body: <p>I have several assumptions in mind please correct me if I'm wrong:</p>
  
  <ol>
  <li>Without a real IOMMU a DMA-Transfer would be a security risk, because a guest could transfer garbage in Host Memory.</li>
  <li>A valid DMA-Transfer between guest memory and passthrough device without a real IOMMU is not possible.</li>
  <li>The Host-OS is not aware of any DMA-related things related to the passthrough device</li>
  </ol>
  
  <hr>
  
  <p>An now some questions:</p>
  
  <ul>
  <li>related to Point 3: Is there a way to get any information about a DMA-Transfer with a passthrough device?</li>
  <li>If I don't have DMA-Remapping on, would KVM complain about it?</li>
  <li>Is there a possibillity to deny any DMA-related stuff for the guest with the passthrough device? </li>
  </ul>