Re: [libvirt] [Qemu-devel] clean/simple Q35 support in libvirt+QEMU for guest OSes that don't support virtio-1.0

On Tue, 2018-08-21 at 14:21 -0400, Laine Stump wrote: > On 08/17/2018 06:35 AM, Andrea Bolognani wrote: > > If we decide we want to explicitly spell out the options instead > > of relying on QEMU changing behavior based on the slot type, which > > is probably a good idea anyway, I think we should have > > > > virtio-0.9 => disable-legacy=no,disable-modern=no > > virtio-1.0 => disable-legacy=yes,disable-modern=no > > > > There's basically no reason to have a device legacy-only rather > > than transitional, and spelling out both options instead of only > > one of them just seems more robust. > > I agree with both of those, but the counter-argument is that "virtio" > already describes a transitional device like your proposal for > virtio-0.9 (at least today), and it makes the versioned models less > orthogonal. In the end, I could go either way... Yeah, Dan already made that argument and convinced me that we should use virtio-0.9 for legacy only, virtio-1.0 for modern only and plain virtio for no enforced behavior / transitional.