Re: [PATCH v3] KVM: SEV: Mark nested locking of vcpu->lock

[Paolo Bonzini]

On 4/20/22 22:14, Peter Gonda wrote:
> > > > svm_vm_migrate_from() uses sev_lock_vcpus_for_migration() to lock all
> > > > source and target vcpu->locks. Mark the nested subclasses to avoid false
> > > > positives from lockdep.
> > Nope. Good catch, I didn't realize there was a limit 8 subclasses:
> Does anyone have thoughts on how we can resolve this vCPU locking with
> the 8 subclass max?

The documentation does not have anything.  Maybe you can call 
mutex_release manually (and mutex_acquire before unlocking).

Paolo