Re: [PATCH 0/2] i386: Fix interrupt based Async PF enablement

[Dr. David Alan Gilbert]

* Paolo Bonzini (pbonzini@redhat.com) wrote:
> On 06/04/21 13:42, Vitaly Kuznetsov wrote:
> > older machine types are still available (I disable it for <= 5.1 but we
> > can consider disabling it for 5.2 too). The feature is upstream since
> > Linux 5.8, I know that QEMU supports much older kernels but this doesn't
> > probably mean that we can't enable new KVM PV features unless all
> > supported kernels have it, we'd have to wait many years otherwise.
> 
> Yes, this is a known problem in fact. :(  In 6.0 we even support RHEL 7,
> though that will go away in 6.1.
> 
> We should take the occasion of dropping RHEL7 to be clearer about which
> kernels are supported.

It would be nice to be able to define sets of KVM functonality that we
can either start given machine types with, or provide a separate switch
to limit kvm functionality back to some defined point.  We do trip over
the same things pretty regularly when accidentally turning on new
features.

Dave

> Paolo
> 
-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK