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Re: [Qemu-devel] [PATCH] virtio-pci: Don't force Subsystem Vendor ID = V

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [PATCH] virtio-pci: Don't force Subsystem Vendor ID = Vendor ID
Date: Mon, 06 Nov 2017 10:18:07 +0100


> > So in my humble opinion the right thing for people to do is simply
> > to
> > avoid legacy devices. Is something preventing that?
> The same reasons why the concept of transitional devices exists at
> all?

We discussing future driver versions running on future qemu versions,
so we should have virtio 1.0 support on both ends.  So IMO the question
 isn't that silly ...

But by default qemu uses transitional by default for non-express
devices, i.e. for all i440fx machines types.  Which implies virtio-
legacy compatible pci ids.

If we want change this we need a transitional/modern virtio config
switch.  Not only in qemu, but for the whole management stack too.
I don't think it is a good idea to go that route.


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