[PATCH v2 2/4] powerpc/spinlock: support vcpu preempted check

Peter Zijlstra
Wed, 06 Jul 2016 07:58:14 -0000

On Wed, Jul 06, 2016 at 02:46:34PM +0800, Wanpeng Li
wrote:
> > SO it's easy for ppc to implement such interface. Note that
yield_count is
> > set by powerVM/KVM.
> > and only pSeries can run a guest for now. :)
> >
> > I also review x86 related code, looks like we need add one hyer-call
to get
> > such vcpu preemption info?
>
> There is no such stuff to record lock holder in x86 kvm, maybe we
> don't need to depend on PLE handler algorithm to guess it if we can
> know lock holder vCPU directly.

x86/kvm has vcpu->preempted to indicate if a vcpu is currently preempted
or not. I'm just not sure if that is visible to the guest or how to make
it so.