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Subject: Re: [virtio] [PATCH] ccw: split descriptor/available/used rings
On Tue, Oct 08, 2013 at 02:16:06PM +0200, Cornelia Huck wrote: > On Tue, 8 Oct 2013 15:12:39 +0300 > "Michael S. Tsirkin" <mst@redhat.com> wrote: > > > This reminds me - our use of the SenseID format for device > > identification is not in the spec, is it? > > We should probably add it - want to do this? > > I don't think there's a need to do so, as it is a standard channel > command. Every control unit/device since 1973 supports it :) The format of the command is standard, yes. But I really meant which virtio field goes into which field and how does a driver match. Linux guest does: CCW_DEVICE(0x3832, 0) so it ignores device type and model, and matches controller model against virtio device ID. This really should be documented in spec - it's not good that people need to look at guest code to write hypervisors. -- MST
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