hv: pirq: rename related source files

To make the file structure clearer, change the file names:
 - rename arch/x86/interrupt.c to virq.c, for the virtual irq relavant code,
   such as irq injection etc;
 - merge arch/x86/intr_main.c into arch/x86/irq.c;
 - rename arch/x86/intr_lapic.c to lapic.c

Signed-off-by: Yan, Like <like.yan@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/Makefile

@@ -95,14 +95,13 @@ D_SRCS += $(wildcard debug/*.c)
 C_SRCS += boot/acpi.c
 C_SRCS += boot/dmar_parse.c
 C_SRCS += arch/x86/ioapic.c
-C_SRCS += arch/x86/intr_lapic.c
+C_SRCS += arch/x86/lapic.c
 S_SRCS += arch/x86/trampoline.S
 C_SRCS += arch/x86/cpu.c
 C_SRCS += arch/x86/softirq.c
 C_SRCS += arch/x86/cpuid.c
 C_SRCS += arch/x86/mmu.c
 C_SRCS += arch/x86/notify.c
-C_SRCS += arch/x86/intr_main.c
 C_SRCS += arch/x86/vtd.c
 C_SRCS += arch/x86/gdt.c
 S_SRCS += arch/x86/cpu_primary.S
@@ -112,7 +111,7 @@ C_SRCS += arch/x86/timer.c
 C_SRCS += arch/x86/ept.c
 S_SRCS += arch/x86/vmx_asm.S
 C_SRCS += arch/x86/io.c
-C_SRCS += arch/x86/interrupt.c
+C_SRCS += arch/x86/virq.c
 C_SRCS += arch/x86/vmexit.c
 C_SRCS += arch/x86/vmx.c
 C_SRCS += arch/x86/assign.c

hypervisor/arch/x86/irq.c

@@ -732,3 +732,27 @@ void get_cpu_interrupt_info(char *str, int str_max)
 	}
 	snprintf(str, size, "\r\n");
 }
+
+int interrupt_init(uint32_t cpu_id)
+{
+	struct host_idt_descriptor *idtd = &HOST_IDTR;
+	int status;
+
+	set_idt(idtd);
+
+	status = init_lapic(cpu_id);
+	ASSERT(status == 0, "lapic init failed");
+	if (status != 0)
+		return -ENODEV;
+
+	status = init_default_irqs(cpu_id);
+	ASSERT(status == 0, "irqs init failed");
+	if (status != 0)
+		return -ENODEV;
+
+#ifndef CONFIG_EFI_STUB
+	CPU_IRQ_ENABLE();
+#endif
+
+	return status;
+}