On Sun, Nov 08, 2015 at 12:37:47PM +0200, Michael S. Tsirkin wrote:
> I have no problem with that. For example, can we teach
> the DMA API on intel x86 to use PT for virtio by default?
> That would allow merging Andy's patches with
> full compatibility with old guests and hosts.

Well, the only incompatibility comes from an experimental qemu feature,
more explicitly from a bug in that features implementation. So why
should we work around that in the kernel? I think it is not too hard to
fix qemu to generate a correct DMAR table which excludes the virtio
devices from iommu translation.


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