No. This mode was introduced specifically for virtualization so that the IOMMU will only restrict access to a guest machine's memory, such as when KVM is in use

No. This mode was introduced specifically for virtualization so that the IOMMU will only restrict access to a guest machine's memory, such as when KVM is in use: http://lwn.net/Articles/329174/ http://lwn.net/Articles/329174/ The only case in which this would help is when ZFS is on the host and a device passed through to a guest malfunctions.