On Mon, Nov 25, 2024 at 01:16:17PM +0100, Claudio Imbrenda wrote: > On Mon, 25 Nov 2024 12:50:38 +0100 > Heiko Carstens <hca@xxxxxxxxxxxxx> wrote: > > @@ -128,23 +126,16 @@ static void sca_clear_ext_call(struct kvm_vcpu *vcpu) > > struct esca_block *sca = vcpu->kvm->arch.sca; > > union esca_sigp_ctrl *sigp_ctrl = > > &(sca->cpu[vcpu->vcpu_id].sigp_ctrl); > > - union esca_sigp_ctrl old; > > > > - old = READ_ONCE(*sigp_ctrl); > > - expect = old.value; > > - rc = cmpxchg(&sigp_ctrl->value, old.value, 0); > > + WRITE_ONCE(sigp_ctrl->value, 9); > > that's supposed to be a 0, right? Duh... yes, of course. I added the "9" to better find the corresponding code in assembly, and obviously forgot to replace it with 0 again. Thanks for pointing this out! Strange enough this still worked. Hmm.
