Subject: Re: [virtio-comment] [PATCH RFC] virtio-pci: new configuration layout
On Wed, Sep 04, 2013 at 05:21:25PM +0930, Rusty Russell wrote: > "Michael S. Tsirkin" <email@example.com> writes: > > On Mon, Sep 02, 2013 at 10:45:11AM +0930, Rusty Russell wrote: > >> "Michael S. Tsirkin" <firstname.lastname@example.org> writes: > >> > Hmm I am not sure I agree - what does it buy us that feature bits don't already supply? > >> > >> AFAICT it's a PCI question more than a virtio question. The use of > >> revision IDs is left open in the PCI spec, but Microsoft's requirements > >> here seem reasonable: > >> > >> http://msdn.microsoft.com/en-us/library/windows/hardware/gg463287.aspx > > > > They are only reasonable if you consider a requirement that users > > load new drivers for new revision of devices reasonable. > > Well, I think it's reasonable for a driver to contain revision-specific > workarounds. That's kind of what the field is for. Right. And when talking about hardware, it's a safe bet there will be work-arounds for each new revision. It's hopefully not applicable for virtio.