D4258.id10441.diff
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	Index: sys/dev/hyperv/utilities/hv_kvp.c
	===================================================================
	--- sys/dev/hyperv/utilities/hv_kvp.c
	+++ sys/dev/hyperv/utilities/hv_kvp.c
	@@ -44,6 +44,7 @@
	#include <sys/reboot.h>
	#include <sys/lock.h>
	#include <sys/taskqueue.h>
	+#include <sys/selinfo.h>
	#include <sys/sysctl.h>
	#include <sys/poll.h>
	#include <sys/proc.h>
	@@ -114,6 +115,8 @@
	static struct hv_kvp_msg *hv_kvp_dev_buf;
	struct proc *daemon_task;

	+static struct selinfo hv_kvp_selinfo;
	+
	/*
	* Global state to track and synchronize multiple
	* KVP transaction requests from the host.
	@@ -628,6 +631,9 @@

	/* Send the msg to user via function deamon_read - setting sema */
	sema_post(&kvp_globals.dev_sema);
	+
	+ /* We should wake up the daemon, in case it's doing poll() */
	+ selwakeup(&hv_kvp_selinfo);
	}


	@@ -940,7 +946,7 @@
	* for daemon to read.
	*/
	static int
	-hv_kvp_dev_daemon_poll(struct cdev dev __unused, int events, struct thread td __unused)
	+hv_kvp_dev_daemon_poll(struct cdev dev __unused, int events, struct thread td)
	{
	int revents = 0;

	@@ -953,6 +959,9 @@
	*/
	if (kvp_globals.daemon_busy == true)
	revents = POLLIN;
	+ else
	+ selrecord(td, &hv_kvp_selinfo);
	+
	mtx_unlock(&kvp_globals.pending_mutex);

	return (revents);