[virtio-dev] Re: [PATCH] content: Replace guest OS with driver

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, May 16, 2023 at 08:59:32PM +0000, Parav Pandit wrote:
> 
> > From: Michael S. Tsirkin <mst@redhat.com>
> > Sent: Tuesday, May 16, 2023 4:48 PM
> > 
> > On Tue, May 16, 2023 at 07:50:48PM +0000, Parav Pandit wrote:
> > >
> > > > From: Michael S. Tsirkin <mst@redhat.com>
> > > > Sent: Tuesday, May 16, 2023 6:05 AM
> > >
> > > >
> > > > SO I propose:
> > > >
> > > > \item[ACKNOWLEDGE (1)] Indicates that a transport driver has found the
> > > >     device and recognized it as a valid virtio device transport.
> > > >
> > > > \item[DRIVER (2)] Indicates that a device type specific driver was found
> > > >     and will attempt to attach to the device.
> > > >
> > > Above bisection is a implementation specific example of Linux (though valid
> > and widely used one).
> > >
> > > The UEFI virtio driver doesn't even have such two drivers.
> > > In some OS variant drivers are merged to single kernel binary.
> > 
> > which one?
> > 
> Flavor of a RHEL has inbuilt.

What does this mean exactly? That virtio core is compiled into kernel?
That does not matter at all.

> > > Does driver only matter with device_driver structure or module binary?...
> > 
> > Can't parse your question.
> > 
> > > Driver is largely the software entity that drives the device.
> > > I think we can keep the spec simple enough to not mix these details and just
> > call it a "driver".
> > 
> > Not just linux there are lots of drivers like this.  the two bits pass useful
> > information the way you changed it this distinction is lots.
> > I agree it is worth thinking what exactly does it mean.
> > Since you researched it - what exactly do drivers such as uefi and the unnamed
> > "some OS variant" do exactly?
> There is just one "driver" virtio_net_pci that has sets the required bits.
> 
> > when do they set ACKNOWLEDGE and when DRIVER?
> > 
> Not any different flow.
> Entity is one.

question is, what happens
- before ACKNOWLEDGE
- after ACKNOWLEDGE before DRIVER 
?


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