Messages in this thread | | | Subject | Re: [PATCH V2 RFC] fixup! virtio: convert to use DMA api | From | Paolo Bonzini <> | Date | Mon, 9 May 2016 13:09:24 +0200 |
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On 28/04/2016 17:37, Michael S. Tsirkin wrote: > > All the internally-emulated devices *can* be either translated or > > untranslated. That's just a matter of software. Surely, you currently > > *can't* have translated assigned devices (until someone implements the > > whole VT-d page table shadowing or whatever), so you'll be barred from > > assigning a device to a slot which *previously* had an untranslated > > device. But so what? Put it in a different slot instead. > > Unfortunately people got used to be able to put any device > in any slot, and built external tools around that ability. > It's rather painful to break this assumption.
Once you move to PCIe, a lot of things become more complicated. This is just one of them; instead of needing half a dozen PCI bridges, you'll need half a dozen plus one.
Paolo
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