On Wed, 2014-10-22 at 16:17 +0200, Jan Kiszka wrote: > I thought about this again, and I'm not sure anymore if we can use > ACPI > to "black-list" the incompatible virtio devices. Reason: hotplug. To > my > understanding, the ACPI DRHD tables won't change during runtime when a > device shows up or disappears. We would have to isolate virtio devices > from the rest of the system by using separate buses for it (and avoid > listing those in any DRHD table) and enforce that they only get > plugged > into those buses. I suppose that is not desirable. > > Maybe it's better to fix virtio /wrt IOMMUs.
I always go back to my initial proposal which is to define that current virtio always bypass any iommu (which is what it does really) and have it expose via a new capability if that isn't the case. That means fixing that Xen thingy to allow qemu to know what to expose I assume but that seems to be the less bad approach. Cheers, Ben. _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
