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Subject: Re: [virtio] [PATCH] virtio-ccw: add adapter interrupt support
On Wed, 16 Oct 2013 10:45:22 +1030 Rusty Russell <rusty@au1.ibm.com> wrote: > Cornelia Huck <cornelia.huck@de.ibm.com> writes: > > On Tue, 15 Oct 2013 14:13:58 +1030 > > Rusty Russell <rusty@au1.ibm.com> wrote: > > > >> Cornelia Huck <cornelia.huck@de.ibm.com> writes: > >> > Specify a new channel command to set up two-stage indicators as needed > >> > for adapter interrupts and describe how adapter interrupts are used > >> > for notifications. > >> > >> Since this presumably isn't in the current implementation, should there > >> be a legacy section talking about what happens if it's not supported? > >> Or is that implied and I missed it? > > > > As a device will reject any channel command it doesn't know, we should > > be fine. I'll add a legacy section though; a transitional driver should > > just fall back to classic indicators. > > To make sure I understand correctly: a non-legacy device MUST support > this, right? So a non-transitional driver can count on it? (I guess > the command might fail for other reasons, so it's still nice for the > driver to fall back, but not compulsory). I don't think we win anything if a device stops implementing classic indicators. Configuration-change indicators still use the same mechanism, after all. > > Cheers, > Rusty.
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