On Thu, 21 Dec 2017 13:26:45 +0100
Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote:
> On 12/21/2017 01:12 PM, Christian Borntraeger wrote:
> > If there is a bug in a piece of code it is certainly a good idea to look deeper....
> > I think we can prevent both bugs by something like
> >
> > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> > index 8951ad4d33be..6ee12afced5a 100644
> > --- a/arch/s390/kvm/kvm-s390.c
> > +++ b/arch/s390/kvm/kvm-s390.c
> > @@ -841,6 +841,7 @@ static int kvm_s390_vm_stop_migration(struct kvm *kvm)
> >
> > if (kvm->arch.use_cmma) {
> > kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
> > + synchronize_srcu(&kvm->srcu);
> > vfree(mgs->pgste_bitmap);
> > }
> > kfree(mgs);
> >
> >
> > Need to have a look.
>
> It needs a bit more changes for the get_cmma case.
Given that Christmas is approaching quickly: Get out the two fixes we
have now, worry about the rest later?
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