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Subject: Re: [virtio] Re: [virtio-comment] [PATCH RFC] virtio-pci: new configuration layout
On Mon, Sep 02, 2013 at 10:45:11AM +0930, Rusty Russell wrote: > > More concerns: > > > > We are using revision ID now exactly as was intended to disable old > > drivers - it served us well for 0.X-1.X and would be as useful if we > > ever have 1.X->2.0 transition. > > I think we'll use feature bit 64 for such a transition, now we don't > have a feature bit limit. Two issues: 1. Basically on windows this would interfere with the idea of using different drivers for legacy and non-legacy devices http://msdn.microsoft.com/en-us/library/windows/hardware/ff549553%28v=vs.85%29.aspx windows build up device identification 2. We'd have to declare this use for a feature bit right now, make current drivers check this bit and bail out if set.