kernel mode for an event to occur (ex: a spinlock to become available) can
execute HLT instruction once it has busy-waited for more than a threshold
time-interval. Execution of HLT instruction would cause the hypervisor to put
-the vcpu to sleep until occurence of an appropriate event. Another vcpu of the
+the vcpu to sleep until occurrence of an appropriate event. Another vcpu of the
same guest can wakeup the sleeping vcpu by issuing KVM_HC_KICK_CPU hypercall,
specifying APIC ID (a1) of the vcpu to be woken up. An additional argument (a0)
is used in the hypercall for future use.