Re: [Xen-devel] [Qemu-devel] [PATCH] Add Xen platform PCI device version 2.

[Matt Wilson <msw@xxxxxxxxxx>]

On Wed, Jun 19, 2013 at 11:42:06AM +0100, Alex Bligh wrote:
>
> --On 19 June 2013 10:13:17 +0000 Paul Durrant
> <Paul.Durrant@xxxxxxxxxx> wrote:
> 
> >>We obviously can't say to users "Are you running Windows and are you
> >>running PV drivers >= X.Y, if so set lever A to position B, otherwise if
> >>you are running some other OS or an earlier version of the Windows PV
> >>driver set it to position A".
> >
> >Why not? The device can be chosen on a per-VM basis.
> 
> Not everyone knows what guest some random user will be running
> (consider cloud platforms).

I agree. If this is really the only solution, we would need to have
both versions presented to the guest so that old drivers continue to
work without any intervention.

Matt

> Expecting an admin to introspect the guest is not a good plan.
> Having the same set of levers that work at least reasonably with
> everything is the way to go.
> 

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