Re: [PATCH v2 4/4] virtio-net: Add support for USO features

[Michael S. Tsirkin]

On Thu, Jul 25, 2024 at 06:18:20PM -0400, Peter Xu wrote:
> On Tue, Aug 01, 2023 at 01:31:48AM +0300, Yuri Benditovich wrote:
> > USO features of virtio-net device depend on kernel ability
> > to support them, for backward compatibility by default the
> > features are disabled on 8.0 and earlier.
> > 
> > Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
> > Signed-off-by: Andrew Melnychecnko <andrew@daynix.com>
> 
> Looks like this patch broke migration when the VM starts on a host that has
> USO supported, to another host that doesn't..

This was always the case with all offloads. The answer at the moment is,
don't do this. Long term, we need to start exposing management APIs
to discover this, and management has to disable unsupported features.

-- 
MST