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Re: [Qemu-devel] [PATCH RFC v6 18/20] virtio: support revision-specific


From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] [PATCH RFC v6 18/20] virtio: support revision-specific features
Date: Wed, 7 Jan 2015 21:10:07 +0200

On Wed, Jan 07, 2015 at 05:22:32PM +0100, Cornelia Huck wrote:
> On Sun, 28 Dec 2014 10:32:06 +0200
> "Michael S. Tsirkin" <address@hidden> wrote:
> 
> > On Thu, Dec 11, 2014 at 02:25:20PM +0100, Cornelia Huck wrote:
> > > Devices may support different sets of feature bits depending on which
> > > revision they're operating at. Let's give the transport a way to
> > > re-query the device about its features when the revision has been
> > > changed.
> > > 
> > > Signed-off-by: Cornelia Huck <address@hidden>
> > 
> > So now we have both get_features and get_features_rev, and
> > it's never clear which revision does host_features refer to.
> > IMHO that's just too messy.
> > Let's add get_legacy_features and host_legacy_features instead?
> 
> I wanted to avoid touching anything that does not support version 1.
> And this interface might still work for later revisions, no?

We can add _modern_ then, or rename host_features to host_legacy_features
everywhere as preparation.

-- 
MST



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