D5291.diff
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	Index: sys/dev/hyperv/vmbus/hv_vmbus_drv_freebsd.c
	===================================================================
	--- sys/dev/hyperv/vmbus/hv_vmbus_drv_freebsd.c
	+++ sys/dev/hyperv/vmbus/hv_vmbus_drv_freebsd.c
	@@ -382,8 +382,12 @@
	#ifdef HYPERV
	extern inthand_t IDTVEC(rsvd), IDTVEC(hv_vmbus_callback);

	+#define VMBUS_IDT_START IDT_DTRACE_RET
	+#define VMBUS_IDT_END APIC_TIMER_INT
	+
	/**
	* @brief Find a free IDT slot and setup the interrupt handler.
	+ * range: (VMBUS_IDT_START, VMBUS_IDT_END)
	*/
	static int
	vmbus_vector_alloc(void)
	@@ -397,8 +401,8 @@
	* as vmbus channel callback vector. We install 'hv_vmbus_callback'
	* handler at that vector and use it to interrupt vcpus.
	*/
	- vector = APIC_SPURIOUS_INT;
	- while (--vector >= APIC_IPI_INTS) {
	+ vector = VMBUS_IDT_END;
	+ while (--vector > VMBUS_IDT_START) {
	ip = &idt[vector];
	func = ((long)ip->gd_hioffset << 16 \| ip->gd_looffset);
	if (func == (uintptr_t)&IDTVEC(rsvd)) {
	@@ -428,7 +432,7 @@
	if (vector == 0)
	return;

	- KASSERT(vector >= APIC_IPI_INTS && vector < APIC_SPURIOUS_INT,
	+ KASSERT(vector > VMBUS_IDT_START && vector < VMBUS_IDT_END,
	("invalid vector %d", vector));

	ip = &idt[vector];