On Thu, Dec 03, 2020 at 05:01:32PM +0100, David Hildenbrand wrote: > The real question is: do we even *need* DMA from vfio devices to > virtio-fs regions? If not (do guests rely on it? what does the spec > state?), just don't care about vfio at all and don't map anything. Can DMA to/from the virtio-fs DAX Window happen? Yes, the guest could do it although it's rare. Is it a great idea to combine VFIO and virtio-fs DAX? Maybe not. It involves pinning host page cache pages O_o. Stefan
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