Currently the virt-fs device does not support VIRTIO_F_ACCESS_PLATFORM feature (i.e. IOMMU/DMAR compatibility)

Goal

• Add support for the feature to the virt-fs device

Motivation:

• Currently Windows driver for virtio-fs device declares that the device/driver is not compatible with DMAR (DMA address translation)
• This feature is automatically supported by all the non-virtio PCI devices and by all the virtio devices except of virtio-fs
• Although this feature (DMAR) support is currently not defined as a mandatory by Windows compatibility requirements it is possible that in light of common accent on security  features (as virtualization based security) this feature might become mandatory for future Windows releases and SVVP program.

For more information, see:

Windows Kernel DMA protection

Kernel DMA protection 

Windows Device Guard