On Tue, Jul 22, 2025 at 3:37 PM Paolo Abeni <pab...@redhat.com> wrote: > > On 7/22/25 5:28 AM, Jason Wang wrote: > > On Fri, Jul 18, 2025 at 4:53 PM Paolo Abeni <pab...@redhat.com> wrote: > >> > >> Extend the features configuration space to 128 bits, and allow the > >> common read/write operation to access all of it. > >> > >> On migration, save the 128 bit version of the features only if the > >> upper bits are non zero. Relay reset to clear all the feature > >> space before load. > >> > >> Signed-off-by: Paolo Abeni <pab...@redhat.com> > > > > This is a guest noticeable behaviour change. I wonder if we need a > > command line option to enable and disable this feature for migration > > compatibility. > > This point is not clear to me, could you please elaborate a bit more? do > you mean we need i.e. a DEFINE_PROP_BOOL() or the like to enable the 128 > bit space usage?
Yes, or maybe have a way to let the device to enable it automatically E.g when UDP GSO is enabled for virtio-net. Thanks > > Thanks, > > Paolo >
