Index: usr.sbin/bhyve/block_if.c
===================================================================
--- usr.sbin/bhyve/block_if.c
+++ usr.sbin/bhyve/block_if.c
@@ -37,6 +37,7 @@
 #include <sys/disk.h>
 
 #include <assert.h>
+#include <err.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -447,12 +448,12 @@
 	}
 
 	if (fd < 0) {
-		perror("Could not open backing file");
+		warn("Could not open backing file: %s", nopt);
 		goto err;
 	}
 
         if (fstat(fd, &sbuf) < 0) {
-                perror("Could not stat backing file");
+		warn("Could not stat backing file %s", nopt);
 		goto err;
         }
 
Index: usr.sbin/bhyve/pci_virtio_block.c
===================================================================
--- usr.sbin/bhyve/pci_virtio_block.c
+++ usr.sbin/bhyve/pci_virtio_block.c
@@ -36,6 +36,7 @@
 #include <sys/ioctl.h>
 #include <sys/disk.h>
 
+#include <err.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
@@ -308,7 +309,7 @@
 	snprintf(bident, sizeof(bident), "%d:%d", pi->pi_slot, pi->pi_func);
 	bctxt = blockif_open(opts, bident);
 	if (bctxt == NULL) {       	
-		perror("Could not open backing file");
+		warn("Could not open backing file %s", opts);
 		return (1);
 	}