Rename 'vm_interrupt_hostcpu()' to 'vcpu_notify_event()' because the function

has outgrown its original name. Originally this function simply sent an IPI
to the host cpu that a vcpu was executing on but now it does a lot more than
just that.

Reviewed by:	grehan@

3 files changed, 11 insertions, 4 deletions

diff --git a/sys/amd64/include/vmm.h b/sys/amd64/include/vmm.h
index b6bb309..15dabdc 100644
--- a/sys/amd64/include/vmm.h
+++ b/sys/amd64/include/vmm.h
@@ -156,7 +156,7 @@ vcpu_is_running(struct vm *vm, int vcpu, int *hostcpu)
 }
 
 void *vcpu_stats(struct vm *vm, int vcpu);
-void vm_interrupt_hostcpu(struct vm *vm, int vcpu);
+void vcpu_notify_event(struct vm *vm, int vcpuid);
 struct vmspace *vm_get_vmspace(struct vm *vm);
 int vm_assign_pptdev(struct vm *vm, int bus, int slot, int func);
 int vm_unassign_pptdev(struct vm *vm, int bus, int slot, int func);
diff --git a/sys/amd64/vmm/vmm.c b/sys/amd64/vmm/vmm.c
index 3e52a8e..d2df5b1 100644
--- a/sys/amd64/vmm/vmm.c
+++ b/sys/amd64/vmm/vmm.c
@@ -1099,7 +1099,7 @@ vm_inject_nmi(struct vm *vm, int vcpuid)
 	vcpu = &vm->vcpu[vcpuid];
 
 	vcpu->nmi_pending = 1;
-	vm_interrupt_hostcpu(vm, vcpuid);
+	vcpu_notify_event(vm, vcpuid);
 	return (0);
 }
 
@@ -1319,8 +1319,15 @@ vm_set_x2apic_state(struct vm *vm, int vcpuid, enum x2apic_state state)
 	return (0);
 }
 
+/*
+ * This function is called to ensure that a vcpu "sees" a pending event
+ * as soon as possible:
+ * - If the vcpu thread is sleeping then it is woken up.
+ * - If the vcpu is running on a different host_cpu then an IPI will be directed
+ *   to the host_cpu to cause the vcpu to trap into the hypervisor.
+ */
 void
-vm_interrupt_hostcpu(struct vm *vm, int vcpuid)
+vcpu_notify_event(struct vm *vm, int vcpuid)
 {
 	int hostcpu;
 	struct vcpu *vcpu;
diff --git a/sys/amd64/vmm/vmm_lapic.c b/sys/amd64/vmm/vmm_lapic.c
index 465ce6c..5217529 100644
--- a/sys/amd64/vmm/vmm_lapic.c
+++ b/sys/amd64/vmm/vmm_lapic.c
@@ -75,7 +75,7 @@ lapic_set_intr(struct vm *vm, int cpu, int vector, bool level)
 	vlapic = vm_lapic(vm, cpu);
 	vlapic_set_intr_ready(vlapic, vector, level);
 
-	vm_interrupt_hostcpu(vm, cpu);
+	vcpu_notify_event(vm, cpu);
 
 	return (0);
 }