[Qemu-devel] [PATCH v3 0/7] Introduce -display and make VNC optional

[Qemu-devel] [PATCH v3 0/7] Introduce -display and make VNC optional

[Jes.Sorensen]

From: Jes Sorensen <Jes.Sorensen@redhat.com>

Hi,

This is the third version of the -display patches and the option to
make VNC optional.

It introduces a new -display argument to consolidate the current
-sdl/-curses/-nographic/-vnc arguments and I included the patch I
posted last week to consolidate the DisplaySurface code.

New in v3 I removed -serial and changed the return of
qemu_alloc_display() to void as suggested by Anthony.

Cheers,
Jes

Jes Sorensen (7):
  Consolidate DisplaySurface allocation in qemu_alloc_display()
  Introduce -display argument
  Introduce -display none
  Add support for -display vnc
  error message if user specifies SDL cmd line option when SDL is
    disabled
  error message if user specifies curses on cmd line when curses is
    disabled
  Make VNC support optional

 Makefile.objs   |   19 ++++----
 configure       |   37 +++++++++++-----
 console.c       |   46 ++++++++++----------
 console.h       |   28 +++++++++++-
 monitor.c       |   22 ++++-----
 qemu-options.hx |   41 +++++++++++++-----
 qerror.h        |    3 +
 sysemu.h        |    1 +
 ui/sdl.c        |   20 ++++-----
 ui/vnc.c        |   14 ++++--
 vl.c            |  127 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
 11 files changed, 267 insertions(+), 91 deletions(-)

-- 
1.7.4

[Qemu-devel] [PATCH 1/7] Consolidate DisplaySurface allocation in qemu_alloc_display()

[Jes.Sorensen]

From: Jes Sorensen <Jes.Sorensen@redhat.com>

This removes various code duplication from console.e and sdl.c

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
 console.c |   46 ++++++++++++++++++++++++----------------------
 console.h |    2 ++
 ui/sdl.c  |   20 ++++++++------------
 3 files changed, 34 insertions(+), 34 deletions(-)

diff --git a/console.c b/console.c
index 57d6eb5..f86186f 100644
--- a/console.c
+++ b/console.c
@@ -1278,38 +1278,40 @@ static DisplaySurface* defaultallocator_create_displaysurface(int width, int hei
 {
     DisplaySurface *surface = (DisplaySurface*) qemu_mallocz(sizeof(DisplaySurface));
 
-    surface->width = width;
-    surface->height = height;
-    surface->linesize = width * 4;
-    surface->pf = qemu_default_pixelformat(32);
-#ifdef HOST_WORDS_BIGENDIAN
-    surface->flags = QEMU_ALLOCATED_FLAG | QEMU_BIG_ENDIAN_FLAG;
-#else
-    surface->flags = QEMU_ALLOCATED_FLAG;
-#endif
-    surface->data = (uint8_t*) qemu_mallocz(surface->linesize * surface->height);
-
+    int linesize = width * 4;
+    qemu_alloc_display(surface, width, height, linesize,
+                       qemu_default_pixelformat(32), 0);
     return surface;
 }
 
 static DisplaySurface* defaultallocator_resize_displaysurface(DisplaySurface *surface,
                                           int width, int height)
 {
+    int linesize = width * 4;
+    qemu_alloc_display(surface, width, height, linesize,
+                       qemu_default_pixelformat(32), 0);
+    return surface;
+}
+
+void qemu_alloc_display(DisplaySurface *surface, int width, int height,
+                        int linesize, PixelFormat pf, int newflags)
+{
+    void *data;
     surface->width = width;
     surface->height = height;
-    surface->linesize = width * 4;
-    surface->pf = qemu_default_pixelformat(32);
-    if (surface->flags & QEMU_ALLOCATED_FLAG)
-        surface->data = (uint8_t*) qemu_realloc(surface->data, surface->linesize * surface->height);
-    else
-        surface->data = (uint8_t*) qemu_malloc(surface->linesize * surface->height);
+    surface->linesize = linesize;
+    surface->pf = pf;
+    if (surface->flags & QEMU_ALLOCATED_FLAG) {
+        data = qemu_realloc(surface->data,
+                            surface->linesize * surface->height);
+    } else {
+        data = qemu_malloc(surface->linesize * surface->height);
+    }
+    surface->data = (uint8_t *)data;
+    surface->flags = newflags | QEMU_ALLOCATED_FLAG;
 #ifdef HOST_WORDS_BIGENDIAN
-    surface->flags = QEMU_ALLOCATED_FLAG | QEMU_BIG_ENDIAN_FLAG;
-#else
-    surface->flags = QEMU_ALLOCATED_FLAG;
+    surface->flags |= QEMU_BIG_ENDIAN_FLAG;
 #endif
-
-    return surface;
 }
 
 DisplaySurface* qemu_create_displaysurface_from(int width, int height, int bpp,
diff --git a/console.h b/console.h
index f4e4741..711895e 100644
--- a/console.h
+++ b/console.h
@@ -189,6 +189,8 @@ void register_displaystate(DisplayState *ds);
 DisplayState *get_displaystate(void);
 DisplaySurface* qemu_create_displaysurface_from(int width, int height, int bpp,
                                                 int linesize, uint8_t *data);
+void qemu_alloc_display(DisplaySurface *surface, int width, int height,
+                        int linesize, PixelFormat pf, int newflags);
 PixelFormat qemu_different_endianness_pixelformat(int bpp);
 PixelFormat qemu_default_pixelformat(int bpp);
 
diff --git a/ui/sdl.c b/ui/sdl.c
index 47ac49c..c5bb0a3 100644
--- a/ui/sdl.c
+++ b/ui/sdl.c
@@ -176,22 +176,18 @@ static DisplaySurface* sdl_create_displaysurface(int width, int height)
 
     surface->width = width;
     surface->height = height;
-    
+
     if (scaling_active) {
+        int linesize;
+        PixelFormat pf;
         if (host_format.BytesPerPixel != 2 && host_format.BytesPerPixel != 4) {
-            surface->linesize = width * 4;
-            surface->pf = qemu_default_pixelformat(32);
+            linesize = width * 4;
+            pf = qemu_default_pixelformat(32);
         } else {
-            surface->linesize = width * host_format.BytesPerPixel;
-            surface->pf = sdl_to_qemu_pixelformat(&host_format);
+            linesize = width * host_format.BytesPerPixel;
+            pf = sdl_to_qemu_pixelformat(&host_format);
         }
-#ifdef HOST_WORDS_BIGENDIAN
-        surface->flags = QEMU_ALLOCATED_FLAG | QEMU_BIG_ENDIAN_FLAG;
-#else
-        surface->flags = QEMU_ALLOCATED_FLAG;
-#endif
-        surface->data = (uint8_t*) qemu_mallocz(surface->linesize * surface->height);
-
+        qemu_alloc_display(surface, width, height, linesize, pf, 0);
         return surface;
     }
 
-- 
1.7.4

[Qemu-devel] [PATCH 2/7] Introduce -display argument

[Jes.Sorensen]

From: Jes Sorensen <Jes.Sorensen@redhat.com>

This patch introduces a -display argument which consolidates the
setting of the display mode. Valid options are:
sdl/curses/default/serial (serial is equivalent to -nographic)

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
 qemu-options.hx |   20 ++++++++++++++
 vl.c            |   75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 95 insertions(+), 0 deletions(-)

diff --git a/qemu-options.hx b/qemu-options.hx
index badb730..98db829 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -590,6 +590,26 @@ STEXI
 @table @option
 ETEXI
 
+DEF("display", HAS_ARG, QEMU_OPTION_display,
+    "-display sdl[,frame=on|off][,alt_grab=on|off][,ctrl_grab=on|off]\n"
+    "            [,window_close=on|off]|curses\n"
+    "                select display type\n", QEMU_ARCH_ALL)
+STEXI
+@item -display @var{type}
+@findex -display
+Select type of display to use. This option is a replacement for the
+old style -sdl/-curses/... options. Valid values for @var{type} are
+@table @option
+@item sdl
+Pick the SDL display option.
+@item curses
+Pick the curses display option. Normally, QEMU uses SDL to display the
+VGA output.  With this option, QEMU can display the VGA output when in
+text mode using a curses/ncurses interface.  Nothing is displayed in
+graphical mode.
+@end table
+ETEXI
+
 DEF("nographic", 0, QEMU_OPTION_nographic,
     "-nographic      disable graphical output and redirect serial I/Os to console\n",
     QEMU_ARCH_ALL)
diff --git a/vl.c b/vl.c
index 5e007a7..2a1ac3c 100644
--- a/vl.c
+++ b/vl.c
@@ -1554,6 +1554,78 @@ static void select_vgahw (const char *p)
     }
 }
 
+static DisplayType select_display(const char *p)
+{
+    const char *opts;
+    DisplayType display = DT_DEFAULT;
+
+    if (strstart(p, "sdl", &opts)) {
+#ifdef CONFIG_SDL
+        display = DT_SDL;
+        while (*opts) {
+            const char *nextopt;
+
+            if (strstart(opts, ",frame=", &nextopt)) {
+                opts = nextopt;
+                if (strstart(opts, "on", &nextopt)) {
+                    no_frame = 0;
+                } else if (strstart(opts, "off", &nextopt)) {
+                    no_frame = 1;
+                } else {
+                    goto invalid_display;
+                }
+            } else if (strstart(opts, ",alt_grab=", &nextopt)) {
+                opts = nextopt;
+                if (strstart(opts, "on", &nextopt)) {
+                    alt_grab = 1;
+                } else if (strstart(opts, "off", &nextopt)) {
+                    alt_grab = 0;
+                } else {
+                    goto invalid_display;
+                }
+            } else if (strstart(opts, ",ctrl_grab=", &nextopt)) {
+                opts = nextopt;
+                if (strstart(opts, "on", &nextopt)) {
+                    ctrl_grab = 1;
+                } else if (strstart(opts, "off", &nextopt)) {
+                    ctrl_grab = 0;
+                } else {
+                    goto invalid_display;
+                }
+            } else if (strstart(opts, ",window_close=", &nextopt)) {
+                opts = nextopt;
+                if (strstart(opts, "on", &nextopt)) {
+                    no_quit = 0;
+                } else if (strstart(opts, "off", &nextopt)) {
+                    no_quit = 1;
+                } else {
+                    goto invalid_display;
+                }
+            } else {
+                goto invalid_display;
+            }
+            opts = nextopt;
+        }
+#else
+        fprintf(stderr, "SDL support is disabled\n");
+        exit(1);
+#endif
+    } else if (strstart(p, "curses", &opts)) {
+#ifdef CONFIG_CURSES
+        display = DT_CURSES;
+#else
+        fprintf(stderr, "Curses support is disabled\n");
+        exit(1);
+#endif
+    } else {
+    invalid_display:
+        fprintf(stderr, "Unknown display type: %s\n", p);
+        exit(1);
+    }
+
+    return display;
+}
+
 static int balloon_parse(const char *arg)
 {
     QemuOpts *opts;
@@ -2152,6 +2224,9 @@ int main(int argc, char **argv, char **envp)
                 }
                 numa_add(optarg);
                 break;
+            case QEMU_OPTION_display:
+                display_type = select_display(optarg);
+                break;
             case QEMU_OPTION_nographic:
                 display_type = DT_NOGRAPHIC;
                 break;
-- 
1.7.4

[Qemu-devel] [PATCH 3/7] Introduce -display none

[Jes.Sorensen]

From: Jes Sorensen <Jes.Sorensen@redhat.com>

New option -display none. This option differs from -display nographic
by not trying to take control of stdio etc. but instead behaves as if
a graphics display is enabled, except that it doesn't show one.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
 qemu-options.hx |    8 +++++++-
 sysemu.h        |    1 +
 vl.c            |    2 ++
 3 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/qemu-options.hx b/qemu-options.hx
index 98db829..d4f365a 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -592,7 +592,7 @@ ETEXI
 
 DEF("display", HAS_ARG, QEMU_OPTION_display,
     "-display sdl[,frame=on|off][,alt_grab=on|off][,ctrl_grab=on|off]\n"
-    "            [,window_close=on|off]|curses\n"
+    "            [,window_close=on|off]|curses|none\n"
     "                select display type\n", QEMU_ARCH_ALL)
 STEXI
 @item -display @var{type}
@@ -607,6 +607,12 @@ Pick the curses display option. Normally, QEMU uses SDL to display the
 VGA output.  With this option, QEMU can display the VGA output when in
 text mode using a curses/ncurses interface.  Nothing is displayed in
 graphical mode.
+@item none
+Pick the none display option. This option will still run with an
+emulated graphics card, but none will be displayed to the QEMU
+user. This options differs from the -nographic option in that QEMU
+will behave like if one of the display options had been picked, it
+will not change the control on the command line.
 @end table
 ETEXI
 
diff --git a/sysemu.h b/sysemu.h
index 0a83ab9..c43c7af 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -110,6 +110,7 @@ typedef enum DisplayType
     DT_CURSES,
     DT_SDL,
     DT_NOGRAPHIC,
+    DT_NONE,
 } DisplayType;
 
 extern int autostart;
diff --git a/vl.c b/vl.c
index 2a1ac3c..aec088e 100644
--- a/vl.c
+++ b/vl.c
@@ -1617,6 +1617,8 @@ static DisplayType select_display(const char *p)
         fprintf(stderr, "Curses support is disabled\n");
         exit(1);
 #endif
+    } else if (strstart(p, "none", &opts)) {
+        display = DT_NONE;
     } else {
     invalid_display:
         fprintf(stderr, "Unknown display type: %s\n", p);
-- 
1.7.4

[Qemu-devel] [PATCH 4/7] Add support for -display vnc

[Jes.Sorensen]

From: Jes Sorensen <Jes.Sorensen@redhat.com>

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
 qemu-options.hx |    5 ++++-
 vl.c            |   14 ++++++++++++++
 2 files changed, 18 insertions(+), 1 deletions(-)

diff --git a/qemu-options.hx b/qemu-options.hx
index d4f365a..ac3c2e5 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -592,7 +592,8 @@ ETEXI
 
 DEF("display", HAS_ARG, QEMU_OPTION_display,
     "-display sdl[,frame=on|off][,alt_grab=on|off][,ctrl_grab=on|off]\n"
-    "            [,window_close=on|off]|curses|none\n"
+    "            [,window_close=on|off]|curses|none|\n"
+    "            vnc=<display>[,<optargs>]\n"
     "                select display type\n", QEMU_ARCH_ALL)
 STEXI
 @item -display @var{type}
@@ -613,6 +614,8 @@ emulated graphics card, but none will be displayed to the QEMU
 user. This options differs from the -nographic option in that QEMU
 will behave like if one of the display options had been picked, it
 will not change the control on the command line.
+@item vnc
+Start a VNC server on display <arg>
 @end table
 ETEXI
 
diff --git a/vl.c b/vl.c
index aec088e..371b1c6 100644
--- a/vl.c
+++ b/vl.c
@@ -1610,6 +1610,20 @@ static DisplayType select_display(const char *p)
         fprintf(stderr, "SDL support is disabled\n");
         exit(1);
 #endif
+    } else if (strstart(p, "vnc", &opts)) {
+        display_remote++;
+
+        if (*opts) {
+            const char *nextopt;
+
+            if (strstart(opts, "=", &nextopt)) {
+                vnc_display = nextopt;
+            }
+        }
+        if (!vnc_display) {
+            fprintf(stderr, "VNC requires a display argument vnc=<display>\n");
+            exit(1);
+        }
     } else if (strstart(p, "curses", &opts)) {
 #ifdef CONFIG_CURSES
         display = DT_CURSES;
-- 
1.7.4

[Qemu-devel] [PATCH 5/7] error message if user specifies SDL cmd line option when SDL is disabled

[Jes.Sorensen]

From: Jes Sorensen <Jes.Sorensen@redhat.com>

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
 qemu-options.hx |   10 ----------
 vl.c            |    8 ++++++++
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/qemu-options.hx b/qemu-options.hx
index ac3c2e5..3e9a274 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -645,11 +645,9 @@ QEMU can display the VGA output when in text mode using a
 curses/ncurses interface.  Nothing is displayed in graphical mode.
 ETEXI
 
-#ifdef CONFIG_SDL
 DEF("no-frame", 0, QEMU_OPTION_no_frame,
     "-no-frame       open SDL window without a frame and window decorations\n",
     QEMU_ARCH_ALL)
-#endif
 STEXI
 @item -no-frame
 @findex -no-frame
@@ -658,42 +656,34 @@ available screen space. This makes the using QEMU in a dedicated desktop
 workspace more convenient.
 ETEXI
 
-#ifdef CONFIG_SDL
 DEF("alt-grab", 0, QEMU_OPTION_alt_grab,
     "-alt-grab       use Ctrl-Alt-Shift to grab mouse (instead of Ctrl-Alt)\n",
     QEMU_ARCH_ALL)
-#endif
 STEXI
 @item -alt-grab
 @findex -alt-grab
 Use Ctrl-Alt-Shift to grab mouse (instead of Ctrl-Alt).
 ETEXI
 
-#ifdef CONFIG_SDL
 DEF("ctrl-grab", 0, QEMU_OPTION_ctrl_grab,
     "-ctrl-grab      use Right-Ctrl to grab mouse (instead of Ctrl-Alt)\n",
     QEMU_ARCH_ALL)
-#endif
 STEXI
 @item -ctrl-grab
 @findex -ctrl-grab
 Use Right-Ctrl to grab mouse (instead of Ctrl-Alt).
 ETEXI
 
-#ifdef CONFIG_SDL
 DEF("no-quit", 0, QEMU_OPTION_no_quit,
     "-no-quit        disable SDL window close capability\n", QEMU_ARCH_ALL)
-#endif
 STEXI
 @item -no-quit
 @findex -no-quit
 Disable SDL window close capability.
 ETEXI
 
-#ifdef CONFIG_SDL
 DEF("sdl", 0, QEMU_OPTION_sdl,
     "-sdl            enable SDL\n", QEMU_ARCH_ALL)
-#endif
 STEXI
 @item -sdl
 @findex -sdl
diff --git a/vl.c b/vl.c
index 371b1c6..fb4f734 100644
--- a/vl.c
+++ b/vl.c
@@ -2624,6 +2624,14 @@ int main(int argc, char **argv, char **envp)
             case QEMU_OPTION_sdl:
                 display_type = DT_SDL;
                 break;
+#else
+            case QEMU_OPTION_no_frame:
+            case QEMU_OPTION_alt_grab:
+            case QEMU_OPTION_ctrl_grab:
+            case QEMU_OPTION_no_quit:
+            case QEMU_OPTION_sdl:
+                fprintf(stderr, "SDL support is disabled\n");
+                exit(1);
 #endif
             case QEMU_OPTION_pidfile:
                 pid_file = optarg;
-- 
1.7.4

[Qemu-devel] [PATCH 6/7] error message if user specifies curses on cmd line when curses is disabled

[Jes.Sorensen]

From: Jes Sorensen <Jes.Sorensen@redhat.com>

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
 qemu-options.hx |    2 --
 vl.c            |    7 +++++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/qemu-options.hx b/qemu-options.hx
index 3e9a274..4220aad 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -632,11 +632,9 @@ the console. Therefore, you can still use QEMU to debug a Linux kernel
 with a serial console.
 ETEXI
 
-#ifdef CONFIG_CURSES
 DEF("curses", 0, QEMU_OPTION_curses,
     "-curses         use a curses/ncurses interface instead of SDL\n",
     QEMU_ARCH_ALL)
-#endif
 STEXI
 @item -curses
 @findex curses
diff --git a/vl.c b/vl.c
index fb4f734..96ee883 100644
--- a/vl.c
+++ b/vl.c
@@ -2246,11 +2246,14 @@ int main(int argc, char **argv, char **envp)
             case QEMU_OPTION_nographic:
                 display_type = DT_NOGRAPHIC;
                 break;
-#ifdef CONFIG_CURSES
             case QEMU_OPTION_curses:
+#ifdef CONFIG_CURSES
                 display_type = DT_CURSES;
-                break;
+#else
+                fprintf(stderr, "Curses support is disabled\n");
+                exit(1);
 #endif
+                break;
             case QEMU_OPTION_portrait:
                 graphic_rotate = 1;
                 break;
-- 
1.7.4

[Qemu-devel] [PATCH 7/7] Make VNC support optional

[Jes.Sorensen]

From: Jes Sorensen <Jes.Sorensen@redhat.com>

Per default VNC is enabled.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
 Makefile.objs |   19 ++++++++++---------
 configure     |   37 +++++++++++++++++++++++++------------
 console.h     |   26 ++++++++++++++++++++++++--
 monitor.c     |   22 ++++++++++------------
 qerror.h      |    3 +++
 ui/vnc.c      |   14 ++++++++++----
 vl.c          |   21 +++++++++++++++++----
 7 files changed, 99 insertions(+), 43 deletions(-)

diff --git a/Makefile.objs b/Makefile.objs
index a52f42f..9796d12 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -127,19 +127,20 @@ common-obj-y += $(addprefix audio/, $(audio-obj-y))
 ui-obj-y += keymaps.o
 ui-obj-$(CONFIG_SDL) += sdl.o sdl_zoom.o x_keymap.o
 ui-obj-$(CONFIG_CURSES) += curses.o
-ui-obj-y += vnc.o d3des.o
-ui-obj-y += vnc-enc-zlib.o vnc-enc-hextile.o
-ui-obj-y += vnc-enc-tight.o vnc-palette.o
-ui-obj-y += vnc-enc-zrle.o
-ui-obj-$(CONFIG_VNC_TLS) += vnc-tls.o vnc-auth-vencrypt.o
-ui-obj-$(CONFIG_VNC_SASL) += vnc-auth-sasl.o
-ui-obj-$(CONFIG_COCOA) += cocoa.o
+vnc-obj-y += vnc.o d3des.o
+vnc-obj-y += vnc-enc-zlib.o vnc-enc-hextile.o
+vnc-obj-y += vnc-enc-tight.o vnc-palette.o
+vnc-obj-y += vnc-enc-zrle.o
+vnc-obj-$(CONFIG_VNC_TLS) += vnc-tls.o vnc-auth-vencrypt.o
+vnc-obj-$(CONFIG_VNC_SASL) += vnc-auth-sasl.o
+vnc-obj-$(CONFIG_COCOA) += cocoa.o
 ifdef CONFIG_VNC_THREAD
-ui-obj-y += vnc-jobs-async.o
+vnc-obj-y += vnc-jobs-async.o
 else
-ui-obj-y += vnc-jobs-sync.o
+vnc-obj-y += vnc-jobs-sync.o
 endif
 common-obj-y += $(addprefix ui/, $(ui-obj-y))
+common-obj-$(CONFIG_VNC) += $(addprefix ui/, $(vnc-obj-y))
 
 common-obj-y += iov.o acl.o
 common-obj-$(CONFIG_POSIX) += qemu-thread-posix.o compatfd.o
diff --git a/configure b/configure
index a166de0..abd3317 100755
--- a/configure
+++ b/configure
@@ -117,6 +117,7 @@ kvm=""
 kvm_para=""
 nptl=""
 sdl=""
+vnc="yes"
 sparse="no"
 uuid=""
 vde=""
@@ -539,6 +540,10 @@ for opt do
   ;;
   --enable-sdl) sdl="yes"
   ;;
+  --disable-vnc) vnc="no"
+  ;;
+  --enable-vnc) vnc="yes"
+  ;;
   --fmod-lib=*) fmod_lib="$optarg"
   ;;
   --fmod-inc=*) fmod_inc="$optarg"
@@ -836,6 +841,8 @@ echo "  --disable-strip          disable stripping binaries"
 echo "  --disable-werror         disable compilation abort on warning"
 echo "  --disable-sdl            disable SDL"
 echo "  --enable-sdl             enable SDL"
+echo "  --disable-vnc            disable VNC"
+echo "  --enable-vnc             enable VNC"
 echo "  --enable-cocoa           enable COCOA (Mac OS X only)"
 echo "  --audio-drv-list=LIST    set audio drivers list:"
 echo "                           Available drivers: $audio_possible_drivers"
@@ -1273,7 +1280,7 @@ fi
 
 ##########################################
 # VNC TLS detection
-if test "$vnc_tls" != "no" ; then
+if test "$vnc" = "yes" -a "$vnc_tls" != "no" ; then
   cat > $TMPC <<EOF
 #include <gnutls/gnutls.h>
 int main(void) { gnutls_session_t s; gnutls_init(&s, GNUTLS_SERVER); return 0; }
@@ -1293,7 +1300,7 @@ fi
 
 ##########################################
 # VNC SASL detection
-if test "$vnc_sasl" != "no" ; then
+if test "$vnc" = "yes" -a "$vnc_sasl" != "no" ; then
   cat > $TMPC <<EOF
 #include <sasl/sasl.h>
 #include <stdio.h>
@@ -1315,7 +1322,7 @@ fi
 
 ##########################################
 # VNC JPEG detection
-if test "$vnc_jpeg" != "no" ; then
+if test "$vnc" = "yes" -a "$vnc_jpeg" != "no" ; then
 cat > $TMPC <<EOF
 #include <stdio.h>
 #include <jpeglib.h>
@@ -1336,7 +1343,7 @@ fi
 
 ##########################################
 # VNC PNG detection
-if test "$vnc_png" != "no" ; then
+if test "$vnc" = "yes" -a "$vnc_png" != "no" ; then
 cat > $TMPC <<EOF
 //#include <stdio.h>
 #include <png.h>
@@ -2495,11 +2502,14 @@ echo "Audio drivers     $audio_drv_list"
 echo "Extra audio cards $audio_card_list"
 echo "Block whitelist   $block_drv_whitelist"
 echo "Mixer emulation   $mixemu"
-echo "VNC TLS support   $vnc_tls"
-echo "VNC SASL support  $vnc_sasl"
-echo "VNC JPEG support  $vnc_jpeg"
-echo "VNC PNG support   $vnc_png"
-echo "VNC thread        $vnc_thread"
+echo "VNC support       $vnc"
+if test "$vnc" = "yes" ; then
+    echo "VNC TLS support   $vnc_tls"
+    echo "VNC SASL support  $vnc_sasl"
+    echo "VNC JPEG support  $vnc_jpeg"
+    echo "VNC PNG support   $vnc_png"
+    echo "VNC thread        $vnc_thread"
+fi
 if test -n "$sparc_cpu"; then
     echo "Target Sparc Arch $sparc_cpu"
 fi
@@ -2649,6 +2659,9 @@ echo "CONFIG_BDRV_WHITELIST=$block_drv_whitelist" >> $config_host_mak
 if test "$mixemu" = "yes" ; then
   echo "CONFIG_MIXEMU=y" >> $config_host_mak
 fi
+if test "$vnc" = "yes" ; then
+  echo "CONFIG_VNC=y" >> $config_host_mak
+fi
 if test "$vnc_tls" = "yes" ; then
   echo "CONFIG_VNC_TLS=y" >> $config_host_mak
   echo "VNC_TLS_CFLAGS=$vnc_tls_cflags" >> $config_host_mak
@@ -2657,15 +2670,15 @@ if test "$vnc_sasl" = "yes" ; then
   echo "CONFIG_VNC_SASL=y" >> $config_host_mak
   echo "VNC_SASL_CFLAGS=$vnc_sasl_cflags" >> $config_host_mak
 fi
-if test "$vnc_jpeg" != "no" ; then
+if test "$vnc_jpeg" = "yes" ; then
   echo "CONFIG_VNC_JPEG=y" >> $config_host_mak
   echo "VNC_JPEG_CFLAGS=$vnc_jpeg_cflags" >> $config_host_mak
 fi
-if test "$vnc_png" != "no" ; then
+if test "$vnc_png" = "yes" ; then
   echo "CONFIG_VNC_PNG=y" >> $config_host_mak
   echo "VNC_PNG_CFLAGS=$vnc_png_cflags" >> $config_host_mak
 fi
-if test "$vnc_thread" != "no" ; then
+if test "$vnc_thread" = "yes" ; then
   echo "CONFIG_VNC_THREAD=y" >> $config_host_mak
 fi
 if test "$fnmatch" = "yes" ; then
diff --git a/console.h b/console.h
index 711895e..64d1f09 100644
--- a/console.h
+++ b/console.h
@@ -4,6 +4,8 @@
 #include "qemu-char.h"
 #include "qdict.h"
 #include "notify.h"
+#include "qerror.h"
+#include "monitor.h"
 
 /* keyboard/mouse support */
 
@@ -370,12 +372,32 @@ void cocoa_display_init(DisplayState *ds, int full_screen);
 void vnc_display_init(DisplayState *ds);
 void vnc_display_close(DisplayState *ds);
 int vnc_display_open(DisplayState *ds, const char *display);
-int vnc_display_password(DisplayState *ds, const char *password);
 int vnc_display_disable_login(DisplayState *ds);
+char *vnc_display_local_addr(DisplayState *ds);
+#ifdef CONFIG_VNC
+int vnc_display_password(DisplayState *ds, const char *password);
 int vnc_display_pw_expire(DisplayState *ds, time_t expires);
 void do_info_vnc_print(Monitor *mon, const QObject *data);
 void do_info_vnc(Monitor *mon, QObject **ret_data);
-char *vnc_display_local_addr(DisplayState *ds);
+#else
+static inline int vnc_display_password(DisplayState *ds, const char *password)
+{
+    qerror_report(QERR_FEATURE_DISABLED, "vnc");
+    return -ENODEV;
+}
+static inline int vnc_display_pw_expire(DisplayState *ds, time_t expires)
+{
+    qerror_report(QERR_FEATURE_DISABLED, "vnc");
+    return -ENODEV;
+};
+static inline void do_info_vnc(Monitor *mon, QObject **ret_data)
+{
+};
+static inline void do_info_vnc_print(Monitor *mon, const QObject *data)
+{
+    monitor_printf(mon, "VNC support disabled\n");
+};
+#endif
 
 /* curses.c */
 void curses_display_init(DisplayState *ds, int full_screen);
diff --git a/monitor.c b/monitor.c
index 22ae3bb..4a54c55 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1016,6 +1016,7 @@ static int do_quit(Monitor *mon, const QDict *qdict, QObject **ret_data)
     return 0;
 }
 
+#ifdef CONFIG_VNC
 static int change_vnc_password(const char *password)
 {
     if (!password || !password[0]) {
@@ -1062,6 +1063,13 @@ static int do_change_vnc(Monitor *mon, const char *target, const char *arg)
 
     return 0;
 }
+#else
+static int do_change_vnc(Monitor *mon, const char *target, const char *arg)
+{
+    qerror_report(QERR_FEATURE_DISABLED, "vnc");
+    return -ENODEV;
+}
+#endif
 
 /**
  * do_change(): Change a removable medium, or VNC configuration
@@ -1127,12 +1135,7 @@ static int set_password(Monitor *mon, const QDict *qdict, QObject **ret_data)
         }
         /* Note that setting an empty password will not disable login through
          * this interface. */
-        rc = vnc_display_password(NULL, password);
-        if (rc != 0) {
-            qerror_report(QERR_SET_PASSWD_FAILED);
-            return -1;
-        }
-        return 0;
+        return vnc_display_password(NULL, password);
     }
 
     qerror_report(QERR_INVALID_PARAMETER, "protocol");
@@ -1171,12 +1174,7 @@ static int expire_password(Monitor *mon, const QDict *qdict, QObject **ret_data)
     }
 
     if (strcmp(protocol, "vnc") == 0) {
-        rc = vnc_display_pw_expire(NULL, when);
-        if (rc != 0) {
-            qerror_report(QERR_SET_PASSWD_FAILED);
-            return -1;
-        }
-        return 0;
+        return vnc_display_pw_expire(NULL, when);
     }
 
     qerror_report(QERR_INVALID_PARAMETER, "protocol");
diff --git a/qerror.h b/qerror.h
index f732d45..df61d2c 100644
--- a/qerror.h
+++ b/qerror.h
@@ -171,4 +171,7 @@ QError *qobject_to_qerror(const QObject *obj);
 #define QERR_VNC_SERVER_FAILED \
     "{ 'class': 'VNCServerFailed', 'data': { 'target': %s } }"
 
+#define QERR_FEATURE_DISABLED \
+    "{ 'class': 'FeatureDisabled', 'data': { 'name': %s } }"
+
 #endif /* QERROR_H */
diff --git a/ui/vnc.c b/ui/vnc.c
index 34dc0cd..dd7a44a 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -2638,16 +2638,19 @@ int vnc_display_disable_login(DisplayState *ds)
 
 int vnc_display_password(DisplayState *ds, const char *password)
 {
+    int ret = 0;
     VncDisplay *vs = ds ? (VncDisplay *)ds->opaque : vnc_display;
 
     if (!vs) {
-        return -1;
+        ret = -EINVAL;
+        goto out;
     }
 
     if (!password) {
         /* This is not the intention of this interface but err on the side
            of being safe */
-        return vnc_display_disable_login(ds);
+        ret = vnc_display_disable_login(ds);
+        goto out;
     }
 
     if (vs->password) {
@@ -2656,8 +2659,11 @@ int vnc_display_password(DisplayState *ds, const char *password)
     }
     vs->password = qemu_strdup(password);
     vs->auth = VNC_AUTH_VNC;
-
-    return 0;
+out:
+    if (ret != 0) {
+        qerror_report(QERR_SET_PASSWD_FAILED);
+    }
+    return ret;
 }
 
 int vnc_display_pw_expire(DisplayState *ds, time_t expires)
diff --git a/vl.c b/vl.c
index 96ee883..fb82c2c 100644
--- a/vl.c
+++ b/vl.c
@@ -206,7 +206,9 @@ int smp_cpus = 1;
 int max_cpus = 0;
 int smp_cores = 1;
 int smp_threads = 1;
+#ifdef CONFIG_VNC
 const char *vnc_display;
+#endif
 int acpi_enabled = 1;
 int no_hpet = 0;
 int fd_bootchk = 1;
@@ -2025,7 +2027,9 @@ int main(int argc, char **argv, char **envp)
     int tb_size;
     const char *pid_file = NULL;
     const char *incoming = NULL;
+#ifdef CONFIG_VNC
     int show_vnc_port = 0;
+#endif
     int defconfig = 1;
     const char *trace_file = NULL;
 
@@ -2683,9 +2687,14 @@ int main(int argc, char **argv, char **envp)
                 }
                 break;
 	    case QEMU_OPTION_vnc:
+#ifdef CONFIG_VNC
                 display_remote++;
-		vnc_display = optarg;
-		break;
+                vnc_display = optarg;
+#else
+                fprintf(stderr, "VNC support is disabled\n");
+                exit(1);
+#endif
+                break;
             case QEMU_OPTION_no_acpi:
                 acpi_enabled = 0;
                 break;
@@ -3139,12 +3148,14 @@ int main(int argc, char **argv, char **envp)
     if (display_type == DT_DEFAULT && !display_remote) {
 #if defined(CONFIG_SDL) || defined(CONFIG_COCOA)
         display_type = DT_SDL;
-#else
+#elif defined(CONFIG_VNC)
         vnc_display = "localhost:0,to=99";
         show_vnc_port = 1;
+#else
+        display_type = DT_NONE;
 #endif
     }
-        
+
 
     /* init local displays */
     switch (display_type) {
@@ -3168,6 +3179,7 @@ int main(int argc, char **argv, char **envp)
         break;
     }
 
+#ifdef CONFIG_VNC
     /* init remote displays */
     if (vnc_display) {
         vnc_display_init(ds);
@@ -3178,6 +3190,7 @@ int main(int argc, char **argv, char **envp)
             printf("VNC server running on `%s'\n", vnc_display_local_addr(ds));
         }
     }
+#endif
 #ifdef CONFIG_SPICE
     if (using_spice && !qxl_enabled) {
         qemu_spice_display_init(ds);
-- 
1.7.4