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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.
--
dwmw2
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- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, (continued)
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Michael S. Tsirkin, 2016/04/18
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, David Woodhouse, 2016/04/18
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Michael S. Tsirkin, 2016/04/18
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, David Woodhouse, 2016/04/18
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Andy Lutomirski, 2016/04/18
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Michael S. Tsirkin, 2016/04/19
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Andy Lutomirski, 2016/04/19
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Michael S. Tsirkin, 2016/04/19
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Andy Lutomirski, 2016/04/19
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Michael S. Tsirkin, 2016/04/19
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api,
David Woodhouse <=
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Michael S. Tsirkin, 2016/04/19
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Andy Lutomirski, 2016/04/19
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Michael S. Tsirkin, 2016/04/19
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Andy Lutomirski, 2016/04/19
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Michael S. Tsirkin, 2016/04/19
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Andy Lutomirski, 2016/04/19
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Michael S. Tsirkin, 2016/04/20
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Andy Lutomirski, 2016/04/20
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Michael S. Tsirkin, 2016/04/19
- Re: [Qemu-devel] [PATCH RFC] fixup! virtio: convert to use DMA api, Alex Williamson, 2016/04/19