Re: [RFC v3 4/5] KVM: add ioregionfd context

Elena Afanasova
2021-03-10T13:21:22Z

On Tue, 2021-03-09 at 09:01 +0100, Paolo Bonzini wrote:
> On 09/03/21 08:54, Jason Wang wrote:
> > > + return;
> > > +
> > > + spin_lock(&ctx->wq.lock);
> > > + wait_event_interruptible_exclusive_locked(ctx->wq, !ctx-
> > > >busy);
> >
> > Any reason that a simple mutex_lock_interruptible() can't work
> > here?
>
> Or alternatively why can't the callers just take the spinlock.
>
I'm not sure I understand your question. Do you mean why locked version
of wait_event() is used?

> Paolo
>
> > Thanks
> >
> >
> > > + ctx->busy = true;
> > > + spin_unlock(&ctx->wq.lock);