D39150.id.diff
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	diff --git a/sys/dev/hyperv/vmbus/vmbus.c b/sys/dev/hyperv/vmbus/vmbus.c
	--- a/sys/dev/hyperv/vmbus/vmbus.c
	+++ b/sys/dev/hyperv/vmbus/vmbus.c
	@@ -1366,7 +1366,8 @@
	{

	if (device_get_unit(dev) != 0 \|\| vm_guest != VM_GUEST_HV \|\|
	- (hyperv_features & CPUID_HV_MSR_SYNIC) == 0)
	+ (hyperv_features & CPUID_HV_MSR_SYNIC) == 0 \|\|
	+ PAGE_SIZE != 4096)
	return (ENXIO);

	device_set_desc(dev, "Hyper-V Vmbus");
	diff --git a/sys/dev/hyperv/vmbus/vmbus_reg.h b/sys/dev/hyperv/vmbus/vmbus_reg.h
	--- a/sys/dev/hyperv/vmbus/vmbus_reg.h
	+++ b/sys/dev/hyperv/vmbus/vmbus_reg.h
	@@ -102,7 +102,7 @@
	mnf_param[VMBUS_MONTRIGS_MAX][VMBUS_MONTRIG_LEN];
	uint8_t mnf_rsvd4[1984];
	} __packed;
	-CTASSERT(sizeof(struct vmbus_mnf) == PAGE_SIZE);
	+CTASSERT(sizeof(struct vmbus_mnf) == 4096);

	/*
	* Buffer ring
	@@ -165,7 +165,7 @@
	uint32_t value;
	} br_feature_bits;

	- /* Padding to PAGE_SIZE */
	+ /* Padding to 4096 */
	uint8_t br_rsvd2[4020];

	/*
	@@ -180,7 +180,7 @@

	uint8_t br_data[];
	} __packed;
	-CTASSERT(sizeof(struct vmbus_bufring) == PAGE_SIZE);
	+CTASSERT(sizeof(struct vmbus_bufring) == 4096);

	/*
	* Channel