Re: [RFC PATCH] virtio_ring: Use DMA API if guest memory is encrypted

[Michael S. Tsirkin]

On Sun, Aug 11, 2019 at 07:56:07AM +0200, Christoph Hellwig wrote:
> So we need a flag on the virtio device, exposed by the
> hypervisor (or hardware for hw virtio devices) that says:  hey, I'm real,
> don't take a shortcut.

The point here is that it's actually still not real. So we would still
use a physical address. However Linux decides that it wants extra
security by moving all data through the bounce buffer.  The distinction
made is that one can actually give device a physical address of the
bounce buffer.

-- 
MST