On Mon, Apr 18, 2016 at 11:29 AM, David Woodhouse <dw...@infradead.org> wrote: > For x86, you *can* enable virtio-behind-IOMMU if your DMAR tables tell > the truth, and even legacy kernels ought to cope with that. > FSVO 'ought to' where I suspect some of them will actually crash with a > NULL pointer dereference if there's no "catch-all" DMAR unit in the > tables, which puts it back into the same camp as ARM and Power.
I think x86 may get a bit of a free pass here. AFAIK the QEMU IOMMU implementation on x86 has always been "experimental", so it just might be okay to change it in a way that causes some older kernels to OOPS. --Andy
