Index: head/sys/dev/hyperv/utilities/hv_heartbeat.c
===================================================================
--- head/sys/dev/hyperv/utilities/hv_heartbeat.c
+++ head/sys/dev/hyperv/utilities/hv_heartbeat.c
@@ -64,7 +64,7 @@
 	softc = (hv_util_sc*)context;
 	buf = softc->receive_buffer;
 
-	recvlen = PAGE_SIZE;
+	recvlen = softc->ic_buflen;
 	ret = vmbus_chan_recv(channel, buf, &recvlen, &requestid);
 	KASSERT(ret != ENOBUFS, ("hvheartbeat recvbuf is not large enough"));
 	/* XXX check recvlen to make sure that it contains enough data */
Index: head/sys/dev/hyperv/utilities/hv_kvp.c
===================================================================
--- head/sys/dev/hyperv/utilities/hv_kvp.c
+++ head/sys/dev/hyperv/utilities/hv_kvp.c
@@ -629,7 +629,7 @@
 	kvp_buf = sc->util_sc.receive_buffer;
 	channel = vmbus_get_channel(sc->dev);
 
-	recvlen = 2 * PAGE_SIZE;
+	recvlen = sc->util_sc.ic_buflen;
 	ret = vmbus_chan_recv(channel, kvp_buf, &recvlen, &requestid);
 	KASSERT(ret != ENOBUFS, ("hvkvp recvbuf is not large enough"));
 	/* XXX check recvlen to make sure that it contains enough data */
@@ -696,7 +696,7 @@
 		/*
 		 * Try reading next buffer
 		 */
-		recvlen = 2 * PAGE_SIZE;
+		recvlen = sc->util_sc.ic_buflen;
 		ret = vmbus_chan_recv(channel, kvp_buf, &recvlen, &requestid);
 		KASSERT(ret != ENOBUFS, ("hvkvp recvbuf is not large enough"));
 		/* XXX check recvlen to make sure that it contains enough data */
Index: head/sys/dev/hyperv/utilities/hv_shutdown.c
===================================================================
--- head/sys/dev/hyperv/utilities/hv_shutdown.c
+++ head/sys/dev/hyperv/utilities/hv_shutdown.c
@@ -68,7 +68,7 @@
 	softc = (hv_util_sc*)context;
 	buf = softc->receive_buffer;
 
-	recv_len = PAGE_SIZE;
+	recv_len = softc->ic_buflen;
 	ret = vmbus_chan_recv(channel, buf, &recv_len, &request_id);
 	KASSERT(ret != ENOBUFS, ("hvshutdown recvbuf is not large enough"));
 	/* XXX check recv_len to make sure that it contains enough data */
Index: head/sys/dev/hyperv/utilities/hv_timesync.c
===================================================================
--- head/sys/dev/hyperv/utilities/hv_timesync.c
+++ head/sys/dev/hyperv/utilities/hv_timesync.c
@@ -145,7 +145,7 @@
 	softc = (hv_timesync_sc*)context;
 	time_buf = softc->util_sc.receive_buffer;
 
-	recvlen = PAGE_SIZE;
+	recvlen = softc->util_sc.ic_buflen;
 	ret = vmbus_chan_recv(channel, time_buf, &recvlen, &requestId);
 	KASSERT(ret != ENOBUFS, ("hvtimesync recvbuf is not large enough"));
 	/* XXX check recvlen to make sure that it contains enough data */
Index: head/sys/dev/hyperv/utilities/hv_util.h
===================================================================
--- head/sys/dev/hyperv/utilities/hv_util.h
+++ head/sys/dev/hyperv/utilities/hv_util.h
@@ -41,6 +41,7 @@
 	 */
 	void (*callback)(struct vmbus_channel *, void *);
 	uint8_t			*receive_buffer;
+	int			ic_buflen;
 } hv_util_sc;
 
 void hv_negotiate_version(struct hv_vmbus_icmsg_hdr *icmsghdrp, uint8_t *buf);
Index: head/sys/dev/hyperv/utilities/hv_util.c
===================================================================
--- head/sys/dev/hyperv/utilities/hv_util.c
+++ head/sys/dev/hyperv/utilities/hv_util.c
@@ -44,6 +44,8 @@
 #include <dev/hyperv/utilities/hv_utilreg.h>
 #include "hv_util.h"
 
+#define VMBUS_IC_BRSIZE		(4 * PAGE_SIZE)
+
 void
 hv_negotiate_version(struct hv_vmbus_icmsg_hdr *icmsghdrp, uint8_t *buf)
 {
@@ -75,14 +77,13 @@
 int
 hv_util_attach(device_t dev)
 {
-	struct hv_util_sc*	softc;
-	struct vmbus_channel *chan;
-	int			ret;
-
-	softc = device_get_softc(dev);
-	softc->receive_buffer =
-		malloc(4 * PAGE_SIZE, M_DEVBUF, M_WAITOK | M_ZERO);
-	chan = vmbus_get_channel(dev);
+	struct hv_util_sc *sc = device_get_softc(dev);
+	struct vmbus_channel *chan = vmbus_get_channel(dev);
+	int error;
+
+	sc->ic_buflen = VMBUS_IC_BRSIZE;
+	sc->receive_buffer = malloc(VMBUS_IC_BRSIZE, M_DEVBUF,
+	    M_WAITOK | M_ZERO);
 
 	/*
 	 * These services are not performance critical and do not need
@@ -93,17 +94,13 @@
 	 */
 	vmbus_chan_set_readbatch(chan, false);
 
-	ret = vmbus_chan_open(chan, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
-	    softc->callback, softc);
-
-	if (ret)
-		goto error0;
-
+	error = vmbus_chan_open(chan, VMBUS_IC_BRSIZE, VMBUS_IC_BRSIZE, NULL, 0,
+	    sc->callback, sc);
+	if (error) {
+		free(sc->receive_buffer, M_DEVBUF);
+		return (error);
+	}
 	return (0);
-
-error0:
-	free(softc->receive_buffer, M_DEVBUF);
-	return (ret);
 }
 
 int