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Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api

From: David Woodhouse
Subject: Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api
Date: Tue, 19 Apr 2016 12:26:44 -0400

On Tue, 2016-04-19 at 19:20 +0300, Michael S. Tsirkin wrote:
> > I thought that PLATFORM served that purpose.  Woudn't the host
> > advertise PLATFORM support and, if the guest doesn't ack it, the host
> > device would skip translation?  Or is that problematic for vfio?
> Exactly that's problematic for security.
> You can't allow guest driver to decide whether device skips security.

Right. Because fundamentally, this *isn't* a property of the endpoint
device, and doesn't live in virtio itself.

It's a property of the platform IOMMU, and lives there.


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