From a71dc724e4e5be75f8d56f225a6f3c2062fa2307 Mon Sep 17 00:00:00 2001
From: Marcelo Araujo <araujo@FreeBSD.org>
Date: Tue, 17 Dec 2019 01:33:26 +0000
Subject: [PATCH] Attempt to load vmm(4) module before creating a guest using
 vm_create() wrapper in libvmmapi.

Submitted by:	Rob Fairbanks <rob.fx907_gmail.com>
Reviewed by:	jhb
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D19400
---
 lib/libvmmapi/vmmapi.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/libvmmapi/vmmapi.c b/lib/libvmmapi/vmmapi.c
index 6cfba69e23c..6f5062545e4 100644
--- a/lib/libvmmapi/vmmapi.c
+++ b/lib/libvmmapi/vmmapi.c
@@ -34,7 +34,9 @@ __FBSDID("$FreeBSD$");
 #include <sys/param.h>
 #include <sys/sysctl.h>
 #include <sys/ioctl.h>
+#include <sys/linker.h>
 #include <sys/mman.h>
+#include <sys/module.h>
 #include <sys/_iovec.h>
 #include <sys/cpuset.h>
 
@@ -103,7 +105,11 @@ vm_device_open(const char *name)
 int
 vm_create(const char *name)
 {
-
+	/* Try to load vmm(4) module before creating a guest. */
+	if (modfind("vmm") < 0) {
+		if (modfind("vmm") < 0)
+			kldload("vmm");
+	}
 	return (CREATE((char *)name));
 }