}
if (spapr->fwnmi_machine_check_interlock != cpu->vcpu_id) {
- /* The vCPU that hit the NMI should invoke "ibm,nmi-interlock" */
- rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
+ /*
+ * The vCPU that hit the NMI should invoke "ibm,nmi-interlock"
+ * This should be PARAM_ERROR, but Linux calls "ibm,nmi-interlock"
+ * for system reset interrupts, despite them not being interlocked.
+ * PowerVM silently ignores this and returns success here. Returning
+ * failure causes Linux to print the error "FWNMI: nmi-interlock
+ * failed: -3", although no other apparent ill effects, this is a
+ * regression for the user when enabling FWNMI. So for now, match
+ * PowerVM. When most Linux clients are fixed, this could be
+ * changed.
+ */
+ rtas_st(rets, 0, RTAS_OUT_SUCCESS);
return;
}