Messages in this thread | | | From | Andy Lutomirski <> | Date | Thu, 19 Nov 2015 13:59:05 -0800 | Subject | Re: [PATCH v3 0/3] virtio DMA API core stuff |
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On Nov 19, 2015 5:45 AM, "Michael S. Tsirkin" <mst@redhat.com> wrote: > > On Tue, Oct 27, 2015 at 11:38:57PM -0700, Andy Lutomirski wrote: > > This switches virtio to use the DMA API unconditionally. I'm sure > > it breaks things, but it seems to work on x86 using virtio-pci, with > > and without Xen, and using both the modern 1.0 variant and the > > legacy variant. > > So thinking hard about it, I don't see any real drawbacks to making this > conditional on a new feature bit, that Xen can then set..
Can you elaborate? If I run QEMU, hosting Xen, hosting Linux, and the virtio device is provided by QEMU, then how does Xen set the bit? Similarly, how would Xen set the bit for a real physical device?
--Andy
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