From 6a8b1eb58304d3599b0ddcb57d8340deac56f139 Mon Sep 17 00:00:00 2001
From: neel <neel@FreeBSD.org>
Date: Sat, 27 Oct 2012 22:58:02 +0000
Subject: Present the bvm dbgport to the guest only when explicitly requested
 via the "-g" command line option.

Suggested by:	grehan
Obtained from:	NetApp
---
 usr.sbin/bhyve/dbgport.c | 67 +++++++++++++++++++++++++++++-------------------
 1 file changed, 40 insertions(+), 27 deletions(-)

diff --git a/usr.sbin/bhyve/dbgport.c b/usr.sbin/bhyve/dbgport.c
index 55efdad..034531c 100644
--- a/usr.sbin/bhyve/dbgport.c
+++ b/usr.sbin/bhyve/dbgport.c
@@ -44,37 +44,12 @@ __FBSDID("$FreeBSD$");
 #include "dbgport.h"
 
 #define	BVM_DBG_PORT	0x224
+#define	BVM_DBG_SIG	('B' << 8 | 'V')
 
 static int listen_fd, conn_fd;
 
 static struct sockaddr_in sin;
 
-void
-init_dbgport(int sport)
-{
-	conn_fd = -1;
-
-	if ((listen_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
-		perror("socket");
-		exit(1);
-	}
-
-	sin.sin_len = sizeof(sin);
-	sin.sin_family = AF_INET;
-	sin.sin_addr.s_addr = htonl(INADDR_ANY);
-	sin.sin_port = htons(sport);
-
-	if (bind(listen_fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
-		perror("bind");
-		exit(1);
-	}
-
-	if (listen(listen_fd, 1) < 0) {
-		perror("listen");
-		exit(1);
-	}
-}
-
 static int
 dbg_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
 	    uint32_t *eax, void *arg)
@@ -82,6 +57,11 @@ dbg_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
 	char ch;
 	int nwritten, nread, printonce;
 
+	if (bytes == 2 && in) {
+		*eax = BVM_DBG_SIG;
+		return (0);
+	}
+
 	if (bytes != 4)
 		return (-1);
 
@@ -122,4 +102,37 @@ again:
 	return (0);
 }
 
-INOUT_PORT(dbg, BVM_DBG_PORT, IOPORT_F_INOUT, dbg_handler);
+static struct inout_port dbgport = {
+	"bvmdbg",
+	BVM_DBG_PORT,
+	IOPORT_F_INOUT,
+	dbg_handler
+};
+
+void
+init_dbgport(int sport)
+{
+	conn_fd = -1;
+
+	if ((listen_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
+		perror("socket");
+		exit(1);
+	}
+
+	sin.sin_len = sizeof(sin);
+	sin.sin_family = AF_INET;
+	sin.sin_addr.s_addr = htonl(INADDR_ANY);
+	sin.sin_port = htons(sport);
+
+	if (bind(listen_fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
+		perror("bind");
+		exit(1);
+	}
+
+	if (listen(listen_fd, 1) < 0) {
+		perror("listen");
+		exit(1);
+	}
+
+	register_inout(&dbgport);
+}
-- 
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