[Qemu-devel] [PATCH v2] qemu-char: don't issue CHR_EVENT_OPEN in a BH

[Qemu-devel] [PATCH v2] qemu-char: don't issue CHR_EVENT_OPEN in a BH

[Michael Roth]

When CHR_EVENT_OPEN was initially added, it was CHR_EVENT_RESET,
and it was issued as a bottom-half:

86e94dea5b740dad65446c857f6959eae43e0ba6

Which we basically used to print out a greeting/prompt for the
monitor.

AFAICT the only reason this was ever done in a BH was because in
some cases we'd modify the chr_write handler for a new chardev
backend *after* the site where we issued the reset (see:
86e94d:qemu_chr_open_stdio())

At some point this event was renamed to CHR_EVENT_OPEN, and we've
maintained the use of this BH ever since.

However, due to 9f939df955a4152aad69a19a77e0898631bb2c18, we schedule
the BH via g_idle_add(), which is causing events to sometimes be
delivered after we've already begun processing data from backends,
leading to:

 known bugs:

  QMP:
    session negotation resets with OPEN event, in some cases this
    is causing new sessions to get sporadically reset

 potential bugs:

  hw/usb/redirect.c:
    can_read handler checks for dev->parser != NULL, which may be
    true if CLOSED BH has not been executed yet. In the past, OPENED
    quiesced outstanding CLOSED events prior to us reading client
    data. If it's delayed, our check may allow reads to occur even
    though we haven't processed the OPENED event yet, and when we
    do finally get the OPENED event, our state may get reset.

  qtest.c:
    can begin session before OPENED event is processed, leading to
    a spurious reset of the system and irq_levels

  gdbstub.c:
    may start a gdb session prior to the machine being paused

To fix these, let's just drop the BH.

Since the initial reasoning for using it still applies to an extent,
work around that be deferring the delivery of CHR_EVENT_OPENED until
after the chardevs have been fully initialized, toward the end of
qmp_chardev_add() (or some cases, qemu_chr_new_from_opts()). This
defers delivery long enough that we can be assured a CharDriverState
is fully initialized before CHR_EVENT_OPENED is sent.

Also, rather than requiring each chardev to do an explicit open, do it
automatically, and allow the small few who don't desire such behavior to
suppress the OPENED on init behavior by setting a
'supress_be_open_on_init' flag.

We additionally add missing OPENED events for stdio backends on w32,
which were previously not being issued, causing us to not recieve the
banner and initial prompts for qmp/hmp.

Reported-by: Stefan Priebe <s.priebe@profihost.ag>
Cc: qemu-stable@nongnu.org
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
v1->v2:
 * default to sending OPENED on backend init, add flag to suppress
   it (Anthony)
 * fix missing OPENED for stdio backends on w32
 * fix missing OPENED when qemu_chr_new_from_opts() doesn't use
   qmp_chardev_add()
 * clean up/update commit message

 backends/baum.c       |    2 +-
 include/sysemu/char.h |    2 +-
 qemu-char.c           |   38 ++++++++++++++++++--------------------
 ui/console.c          |    1 -
 ui/gtk.c              |    1 -
 5 files changed, 20 insertions(+), 24 deletions(-)

diff --git a/backends/baum.c b/backends/baum.c
index 4cba79f..8384ef2 100644
--- a/backends/baum.c
+++ b/backends/baum.c
@@ -611,7 +611,7 @@ CharDriverState *chr_baum_init(void)
 
     qemu_set_fd_handler(baum->brlapi_fd, baum_chr_read, NULL, baum);
 
-    qemu_chr_be_generic_open(chr);
+    chr->be_open_on_init = true;
 
     return chr;
 
diff --git a/include/sysemu/char.h b/include/sysemu/char.h
index 5e42c90..b0ae749 100644
--- a/include/sysemu/char.h
+++ b/include/sysemu/char.h
@@ -70,13 +70,13 @@ struct CharDriverState {
     void (*chr_set_echo)(struct CharDriverState *chr, bool echo);
     void (*chr_set_fe_open)(struct CharDriverState *chr, int fe_open);
     void *opaque;
-    int idle_tag;
     char *label;
     char *filename;
     int be_open;
     int fe_open;
     int explicit_fe_open;
     int avail_connections;
+    bool suppress_be_open_on_init;
     QemuOpts *opts;
     QTAILQ_ENTRY(CharDriverState) next;
 };
diff --git a/qemu-char.c b/qemu-char.c
index 4f8382e..3071ca1 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -110,19 +110,9 @@ void qemu_chr_be_event(CharDriverState *s, int event)
     s->chr_event(s->handler_opaque, event);
 }
 
-static gboolean qemu_chr_be_generic_open_bh(gpointer opaque)
-{
-    CharDriverState *s = opaque;
-    qemu_chr_be_event(s, CHR_EVENT_OPENED);
-    s->idle_tag = 0;
-    return FALSE;
-}
-
 void qemu_chr_be_generic_open(CharDriverState *s)
 {
-    if (s->idle_tag == 0) {
-        s->idle_tag = g_idle_add(qemu_chr_be_generic_open_bh, s);
-    }
+    qemu_chr_be_event(s, CHR_EVENT_OPENED);
 }
 
 int qemu_chr_fe_write(CharDriverState *s, const uint8_t *buf, int len)
@@ -247,6 +237,7 @@ static CharDriverState *qemu_chr_open_null(void)
 
     chr = g_malloc0(sizeof(CharDriverState));
     chr->chr_write = null_chr_write;
+    chr->suppress_be_open_on_init = true;
     return chr;
 }
 
@@ -504,8 +495,6 @@ static CharDriverState *qemu_chr_open_mux(CharDriverState *drv)
     /* Frontend guest-open / -close notification is not support with muxes */
     chr->chr_set_fe_open = NULL;
 
-    /* Muxes are always open on creation */
-    qemu_chr_be_generic_open(chr);
 
     return chr;
 }
@@ -883,8 +872,6 @@ static CharDriverState *qemu_chr_open_fd(int fd_in, int fd_out)
     chr->chr_update_read_handler = fd_chr_update_read_handler;
     chr->chr_close = fd_chr_close;
 
-    qemu_chr_be_generic_open(chr);
-
     return chr;
 }
 
@@ -1243,6 +1230,7 @@ static CharDriverState *qemu_chr_open_pty(const char *id,
     chr->chr_update_read_handler = pty_chr_update_read_handler;
     chr->chr_close = pty_chr_close;
     chr->chr_add_watch = pty_chr_add_watch;
+    chr->suppress_be_open_on_init = true;
 
     s->fd = io_channel_from_fd(master_fd);
     s->timer_tag = 0;
@@ -1594,8 +1582,7 @@ static CharDriverState *qemu_chr_open_pp_fd(int fd)
     chr->chr_ioctl = pp_ioctl;
     chr->chr_close = pp_close;
     chr->opaque = drv;
-
-    qemu_chr_be_generic_open(chr);
+    chr->suppress_be_open_on_init = true;
 
     return chr;
 }
@@ -1650,6 +1637,7 @@ static CharDriverState *qemu_chr_open_pp_fd(int fd)
     chr->opaque = (void *)(intptr_t)fd;
     chr->chr_write = null_chr_write;
     chr->chr_ioctl = pp_ioctl;
+    chr->suppress_be_open_on_init = true;
     return chr;
 }
 #endif
@@ -1880,7 +1868,6 @@ static CharDriverState *qemu_chr_open_win_path(const char *filename)
         g_free(chr);
         return NULL;
     }
-    qemu_chr_be_generic_open(chr);
     return chr;
 }
 
@@ -1980,7 +1967,6 @@ static CharDriverState *qemu_chr_open_pipe(ChardevHostdev *opts)
         g_free(chr);
         return NULL;
     }
-    qemu_chr_be_generic_open(chr);
     return chr;
 }
 
@@ -1994,7 +1980,6 @@ static CharDriverState *qemu_chr_open_win_file(HANDLE fd_out)
     s->hcom = fd_out;
     chr->opaque = s;
     chr->chr_write = win_chr_write;
-    qemu_chr_be_generic_open(chr);
     return chr;
 }
 
@@ -2329,6 +2314,8 @@ static CharDriverState *qemu_chr_open_udp_fd(int fd)
     chr->chr_write = udp_chr_write;
     chr->chr_update_read_handler = udp_chr_update_read_handler;
     chr->chr_close = udp_chr_close;
+    /* be isn't opened until we get a connection */
+    chr->suppress_be_open_on_init = true;
     return chr;
 }
 
@@ -2731,6 +2718,8 @@ static CharDriverState *qemu_chr_open_socket_fd(int fd, bool do_nodelay,
     chr->get_msgfd = tcp_get_msgfd;
     chr->chr_add_client = tcp_chr_add_client;
     chr->chr_add_watch = tcp_chr_add_watch;
+    /* be isn't opened until we get a connection */
+    chr->suppress_be_open_on_init = true;
 
     if (is_listen) {
         s->listen_fd = fd;
@@ -3327,6 +3316,12 @@ CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
     if (!chr->filename)
         chr->filename = g_strdup(qemu_opt_get(opts, "backend"));
     chr->init = init;
+    /* if we didn't create the chardev via qmp_chardev_add, we
+     * need to send the OPENED event here
+     */
+    if (!chr->suppress_be_open_on_init) {
+        qemu_chr_be_event(chr, CHR_EVENT_OPENED);
+    }
     QTAILQ_INSERT_TAIL(&chardevs, chr, next);
 
     if (qemu_opt_get_bool(opts, "mux", 0)) {
@@ -3803,6 +3798,9 @@ ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend,
         chr->label = g_strdup(id);
         chr->avail_connections =
             (backend->kind == CHARDEV_BACKEND_KIND_MUX) ? MAX_MUX : 1;
+        if (!chr->suppress_be_open_on_init) {
+            qemu_chr_be_event(chr, CHR_EVENT_OPENED);
+        }
         QTAILQ_INSERT_TAIL(&chardevs, chr, next);
         return ret;
     } else {
diff --git a/ui/console.c b/ui/console.c
index b30853f..54b192d 100644
--- a/ui/console.c
+++ b/ui/console.c
@@ -1746,7 +1746,6 @@ static void text_console_do_init(CharDriverState *chr, DisplayState *ds)
         s->t_attrib = s->t_attrib_default;
     }
 
-    qemu_chr_be_generic_open(chr);
     if (chr->init)
         chr->init(chr);
 }
diff --git a/ui/gtk.c b/ui/gtk.c
index 52c3f95..71b2497 100644
--- a/ui/gtk.c
+++ b/ui/gtk.c
@@ -1214,7 +1214,6 @@ static GSList *gd_vc_init(GtkDisplayState *s, VirtualConsole *vc, int index, GSL
 
     gtk_menu_shell_append(GTK_MENU_SHELL(view_menu), vc->menu_item);
 
-    qemu_chr_be_generic_open(vc->chr);
     if (vc->chr->init) {
         vc->chr->init(vc->chr);
     }
-- 
1.7.9.5

Re: [Qemu-devel] [PATCH v2] qemu-char: don't issue CHR_EVENT_OPEN in a BH

[Anthony Liguori]

Michael Roth <mdroth@linux.vnet.ibm.com> writes:

> When CHR_EVENT_OPEN was initially added, it was CHR_EVENT_RESET,
> and it was issued as a bottom-half:
>
> 86e94dea5b740dad65446c857f6959eae43e0ba6
>
> Which we basically used to print out a greeting/prompt for the
> monitor.
>
> AFAICT the only reason this was ever done in a BH was because in
> some cases we'd modify the chr_write handler for a new chardev
> backend *after* the site where we issued the reset (see:
> 86e94d:qemu_chr_open_stdio())
>
> At some point this event was renamed to CHR_EVENT_OPEN, and we've
> maintained the use of this BH ever since.
>
> However, due to 9f939df955a4152aad69a19a77e0898631bb2c18, we schedule
> the BH via g_idle_add(), which is causing events to sometimes be
> delivered after we've already begun processing data from backends,
> leading to:
>
>  known bugs:
>
>   QMP:
>     session negotation resets with OPEN event, in some cases this
>     is causing new sessions to get sporadically reset
>
>  potential bugs:
>
>   hw/usb/redirect.c:
>     can_read handler checks for dev->parser != NULL, which may be
>     true if CLOSED BH has not been executed yet. In the past, OPENED
>     quiesced outstanding CLOSED events prior to us reading client
>     data. If it's delayed, our check may allow reads to occur even
>     though we haven't processed the OPENED event yet, and when we
>     do finally get the OPENED event, our state may get reset.
>
>   qtest.c:
>     can begin session before OPENED event is processed, leading to
>     a spurious reset of the system and irq_levels
>
>   gdbstub.c:
>     may start a gdb session prior to the machine being paused
>
> To fix these, let's just drop the BH.
>
> Since the initial reasoning for using it still applies to an extent,
> work around that be deferring the delivery of CHR_EVENT_OPENED until
> after the chardevs have been fully initialized, toward the end of
> qmp_chardev_add() (or some cases, qemu_chr_new_from_opts()). This
> defers delivery long enough that we can be assured a CharDriverState
> is fully initialized before CHR_EVENT_OPENED is sent.
>
> Also, rather than requiring each chardev to do an explicit open, do it
> automatically, and allow the small few who don't desire such behavior to
> suppress the OPENED on init behavior by setting a
> 'supress_be_open_on_init' flag.
>
> We additionally add missing OPENED events for stdio backends on w32,
> which were previously not being issued, causing us to not recieve the
> banner and initial prompts for qmp/hmp.
>
> Reported-by: Stefan Priebe <s.priebe@profihost.ag>
> Cc: qemu-stable@nongnu.org
> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
> ---
> v1->v2:
>  * default to sending OPENED on backend init, add flag to suppress
>    it (Anthony)
>  * fix missing OPENED for stdio backends on w32
>  * fix missing OPENED when qemu_chr_new_from_opts() doesn't use
>    qmp_chardev_add()
>  * clean up/update commit message
>
>  backends/baum.c       |    2 +-
>  include/sysemu/char.h |    2 +-
>  qemu-char.c           |   38 ++++++++++++++++++--------------------
>  ui/console.c          |    1 -
>  ui/gtk.c              |    1 -
>  5 files changed, 20 insertions(+), 24 deletions(-)
>
> diff --git a/backends/baum.c b/backends/baum.c
> index 4cba79f..8384ef2 100644
> --- a/backends/baum.c
> +++ b/backends/baum.c
> @@ -611,7 +611,7 @@ CharDriverState *chr_baum_init(void)
>  
>      qemu_set_fd_handler(baum->brlapi_fd, baum_chr_read, NULL, baum);
>  
> -    qemu_chr_be_generic_open(chr);
> +    chr->be_open_on_init = true;

A carry over from the last patch...  baum is installed on ccnode4 if you
want to test the patch there to make sure you have everything.

I like this very a lot more.  Will give my Reviewed-by on v3.

Regards,

Anthony Liguori

>      return chr;
>  
> diff --git a/include/sysemu/char.h b/include/sysemu/char.h
> index 5e42c90..b0ae749 100644
> --- a/include/sysemu/char.h
> +++ b/include/sysemu/char.h
> @@ -70,13 +70,13 @@ struct CharDriverState {
>      void (*chr_set_echo)(struct CharDriverState *chr, bool echo);
>      void (*chr_set_fe_open)(struct CharDriverState *chr, int fe_open);
>      void *opaque;
> -    int idle_tag;
>      char *label;
>      char *filename;
>      int be_open;
>      int fe_open;
>      int explicit_fe_open;
>      int avail_connections;
> +    bool suppress_be_open_on_init;
>      QemuOpts *opts;
>      QTAILQ_ENTRY(CharDriverState) next;
>  };
> diff --git a/qemu-char.c b/qemu-char.c
> index 4f8382e..3071ca1 100644
> --- a/qemu-char.c
> +++ b/qemu-char.c
> @@ -110,19 +110,9 @@ void qemu_chr_be_event(CharDriverState *s, int event)
>      s->chr_event(s->handler_opaque, event);
>  }
>  
> -static gboolean qemu_chr_be_generic_open_bh(gpointer opaque)
> -{
> -    CharDriverState *s = opaque;
> -    qemu_chr_be_event(s, CHR_EVENT_OPENED);
> -    s->idle_tag = 0;
> -    return FALSE;
> -}
> -
>  void qemu_chr_be_generic_open(CharDriverState *s)
>  {
> -    if (s->idle_tag == 0) {
> -        s->idle_tag = g_idle_add(qemu_chr_be_generic_open_bh, s);
> -    }
> +    qemu_chr_be_event(s, CHR_EVENT_OPENED);
>  }
>  
>  int qemu_chr_fe_write(CharDriverState *s, const uint8_t *buf, int len)
> @@ -247,6 +237,7 @@ static CharDriverState *qemu_chr_open_null(void)
>  
>      chr = g_malloc0(sizeof(CharDriverState));
>      chr->chr_write = null_chr_write;
> +    chr->suppress_be_open_on_init = true;
>      return chr;
>  }
>  
> @@ -504,8 +495,6 @@ static CharDriverState *qemu_chr_open_mux(CharDriverState *drv)
>      /* Frontend guest-open / -close notification is not support with muxes */
>      chr->chr_set_fe_open = NULL;
>  
> -    /* Muxes are always open on creation */
> -    qemu_chr_be_generic_open(chr);
>  
>      return chr;
>  }
> @@ -883,8 +872,6 @@ static CharDriverState *qemu_chr_open_fd(int fd_in, int fd_out)
>      chr->chr_update_read_handler = fd_chr_update_read_handler;
>      chr->chr_close = fd_chr_close;
>  
> -    qemu_chr_be_generic_open(chr);
> -
>      return chr;
>  }
>  
> @@ -1243,6 +1230,7 @@ static CharDriverState *qemu_chr_open_pty(const char *id,
>      chr->chr_update_read_handler = pty_chr_update_read_handler;
>      chr->chr_close = pty_chr_close;
>      chr->chr_add_watch = pty_chr_add_watch;
> +    chr->suppress_be_open_on_init = true;
>  
>      s->fd = io_channel_from_fd(master_fd);
>      s->timer_tag = 0;
> @@ -1594,8 +1582,7 @@ static CharDriverState *qemu_chr_open_pp_fd(int fd)
>      chr->chr_ioctl = pp_ioctl;
>      chr->chr_close = pp_close;
>      chr->opaque = drv;
> -
> -    qemu_chr_be_generic_open(chr);
> +    chr->suppress_be_open_on_init = true;
>  
>      return chr;
>  }
> @@ -1650,6 +1637,7 @@ static CharDriverState *qemu_chr_open_pp_fd(int fd)
>      chr->opaque = (void *)(intptr_t)fd;
>      chr->chr_write = null_chr_write;
>      chr->chr_ioctl = pp_ioctl;
> +    chr->suppress_be_open_on_init = true;
>      return chr;
>  }
>  #endif
> @@ -1880,7 +1868,6 @@ static CharDriverState *qemu_chr_open_win_path(const char *filename)
>          g_free(chr);
>          return NULL;
>      }
> -    qemu_chr_be_generic_open(chr);
>      return chr;
>  }
>  
> @@ -1980,7 +1967,6 @@ static CharDriverState *qemu_chr_open_pipe(ChardevHostdev *opts)
>          g_free(chr);
>          return NULL;
>      }
> -    qemu_chr_be_generic_open(chr);
>      return chr;
>  }
>  
> @@ -1994,7 +1980,6 @@ static CharDriverState *qemu_chr_open_win_file(HANDLE fd_out)
>      s->hcom = fd_out;
>      chr->opaque = s;
>      chr->chr_write = win_chr_write;
> -    qemu_chr_be_generic_open(chr);
>      return chr;
>  }
>  
> @@ -2329,6 +2314,8 @@ static CharDriverState *qemu_chr_open_udp_fd(int fd)
>      chr->chr_write = udp_chr_write;
>      chr->chr_update_read_handler = udp_chr_update_read_handler;
>      chr->chr_close = udp_chr_close;
> +    /* be isn't opened until we get a connection */
> +    chr->suppress_be_open_on_init = true;
>      return chr;
>  }
>  
> @@ -2731,6 +2718,8 @@ static CharDriverState *qemu_chr_open_socket_fd(int fd, bool do_nodelay,
>      chr->get_msgfd = tcp_get_msgfd;
>      chr->chr_add_client = tcp_chr_add_client;
>      chr->chr_add_watch = tcp_chr_add_watch;
> +    /* be isn't opened until we get a connection */
> +    chr->suppress_be_open_on_init = true;
>  
>      if (is_listen) {
>          s->listen_fd = fd;
> @@ -3327,6 +3316,12 @@ CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
>      if (!chr->filename)
>          chr->filename = g_strdup(qemu_opt_get(opts, "backend"));
>      chr->init = init;
> +    /* if we didn't create the chardev via qmp_chardev_add, we
> +     * need to send the OPENED event here
> +     */
> +    if (!chr->suppress_be_open_on_init) {
> +        qemu_chr_be_event(chr, CHR_EVENT_OPENED);
> +    }
>      QTAILQ_INSERT_TAIL(&chardevs, chr, next);
>  
>      if (qemu_opt_get_bool(opts, "mux", 0)) {
> @@ -3803,6 +3798,9 @@ ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend,
>          chr->label = g_strdup(id);
>          chr->avail_connections =
>              (backend->kind == CHARDEV_BACKEND_KIND_MUX) ? MAX_MUX : 1;
> +        if (!chr->suppress_be_open_on_init) {
> +            qemu_chr_be_event(chr, CHR_EVENT_OPENED);
> +        }
>          QTAILQ_INSERT_TAIL(&chardevs, chr, next);
>          return ret;
>      } else {
> diff --git a/ui/console.c b/ui/console.c
> index b30853f..54b192d 100644
> --- a/ui/console.c
> +++ b/ui/console.c
> @@ -1746,7 +1746,6 @@ static void text_console_do_init(CharDriverState *chr, DisplayState *ds)
>          s->t_attrib = s->t_attrib_default;
>      }
>  
> -    qemu_chr_be_generic_open(chr);
>      if (chr->init)
>          chr->init(chr);
>  }
> diff --git a/ui/gtk.c b/ui/gtk.c
> index 52c3f95..71b2497 100644
> --- a/ui/gtk.c
> +++ b/ui/gtk.c
> @@ -1214,7 +1214,6 @@ static GSList *gd_vc_init(GtkDisplayState *s, VirtualConsole *vc, int index, GSL
>  
>      gtk_menu_shell_append(GTK_MENU_SHELL(view_menu), vc->menu_item);
>  
> -    qemu_chr_be_generic_open(vc->chr);
>      if (vc->chr->init) {
>          vc->chr->init(vc->chr);
>      }
> -- 
> 1.7.9.5

Re: [Qemu-devel] [PATCH v2] qemu-char: don't issue CHR_EVENT_OPEN in a BH

[mdroth]

On Mon, Jun 03, 2013 at 12:17:00PM -0500, Anthony Liguori wrote:
> Michael Roth <mdroth@linux.vnet.ibm.com> writes:
> 
> > When CHR_EVENT_OPEN was initially added, it was CHR_EVENT_RESET,
> > and it was issued as a bottom-half:
> >
> > 86e94dea5b740dad65446c857f6959eae43e0ba6
> >
> > Which we basically used to print out a greeting/prompt for the
> > monitor.
> >
> > AFAICT the only reason this was ever done in a BH was because in
> > some cases we'd modify the chr_write handler for a new chardev
> > backend *after* the site where we issued the reset (see:
> > 86e94d:qemu_chr_open_stdio())
> >
> > At some point this event was renamed to CHR_EVENT_OPEN, and we've
> > maintained the use of this BH ever since.
> >
> > However, due to 9f939df955a4152aad69a19a77e0898631bb2c18, we schedule
> > the BH via g_idle_add(), which is causing events to sometimes be
> > delivered after we've already begun processing data from backends,
> > leading to:
> >
> >  known bugs:
> >
> >   QMP:
> >     session negotation resets with OPEN event, in some cases this
> >     is causing new sessions to get sporadically reset
> >
> >  potential bugs:
> >
> >   hw/usb/redirect.c:
> >     can_read handler checks for dev->parser != NULL, which may be
> >     true if CLOSED BH has not been executed yet. In the past, OPENED
> >     quiesced outstanding CLOSED events prior to us reading client
> >     data. If it's delayed, our check may allow reads to occur even
> >     though we haven't processed the OPENED event yet, and when we
> >     do finally get the OPENED event, our state may get reset.
> >
> >   qtest.c:
> >     can begin session before OPENED event is processed, leading to
> >     a spurious reset of the system and irq_levels
> >
> >   gdbstub.c:
> >     may start a gdb session prior to the machine being paused
> >
> > To fix these, let's just drop the BH.
> >
> > Since the initial reasoning for using it still applies to an extent,
> > work around that be deferring the delivery of CHR_EVENT_OPENED until
> > after the chardevs have been fully initialized, toward the end of
> > qmp_chardev_add() (or some cases, qemu_chr_new_from_opts()). This
> > defers delivery long enough that we can be assured a CharDriverState
> > is fully initialized before CHR_EVENT_OPENED is sent.
> >
> > Also, rather than requiring each chardev to do an explicit open, do it
> > automatically, and allow the small few who don't desire such behavior to
> > suppress the OPENED on init behavior by setting a
> > 'supress_be_open_on_init' flag.
> >
> > We additionally add missing OPENED events for stdio backends on w32,
> > which were previously not being issued, causing us to not recieve the
> > banner and initial prompts for qmp/hmp.
> >
> > Reported-by: Stefan Priebe <s.priebe@profihost.ag>
> > Cc: qemu-stable@nongnu.org
> > Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
> > ---
> > v1->v2:
> >  * default to sending OPENED on backend init, add flag to suppress
> >    it (Anthony)
> >  * fix missing OPENED for stdio backends on w32
> >  * fix missing OPENED when qemu_chr_new_from_opts() doesn't use
> >    qmp_chardev_add()
> >  * clean up/update commit message
> >
> >  backends/baum.c       |    2 +-
> >  include/sysemu/char.h |    2 +-
> >  qemu-char.c           |   38 ++++++++++++++++++--------------------
> >  ui/console.c          |    1 -
> >  ui/gtk.c              |    1 -
> >  5 files changed, 20 insertions(+), 24 deletions(-)
> >
> > diff --git a/backends/baum.c b/backends/baum.c
> > index 4cba79f..8384ef2 100644
> > --- a/backends/baum.c
> > +++ b/backends/baum.c
> > @@ -611,7 +611,7 @@ CharDriverState *chr_baum_init(void)
> >  
> >      qemu_set_fd_handler(baum->brlapi_fd, baum_chr_read, NULL, baum);
> >  
> > -    qemu_chr_be_generic_open(chr);
> > +    chr->be_open_on_init = true;
> 
> A carry over from the last patch...  baum is installed on ccnode4 if you
> want to test the patch there to make sure you have everything.

Shoot, thanks, I'll give it a whirl on ccnode4

> 
> I like this very a lot more.  Will give my Reviewed-by on v3.
> 
> Regards,
> 
> Anthony Liguori
> 
> >      return chr;
> >  
> > diff --git a/include/sysemu/char.h b/include/sysemu/char.h
> > index 5e42c90..b0ae749 100644
> > --- a/include/sysemu/char.h
> > +++ b/include/sysemu/char.h
> > @@ -70,13 +70,13 @@ struct CharDriverState {
> >      void (*chr_set_echo)(struct CharDriverState *chr, bool echo);
> >      void (*chr_set_fe_open)(struct CharDriverState *chr, int fe_open);
> >      void *opaque;
> > -    int idle_tag;
> >      char *label;
> >      char *filename;
> >      int be_open;
> >      int fe_open;
> >      int explicit_fe_open;
> >      int avail_connections;
> > +    bool suppress_be_open_on_init;
> >      QemuOpts *opts;
> >      QTAILQ_ENTRY(CharDriverState) next;
> >  };
> > diff --git a/qemu-char.c b/qemu-char.c
> > index 4f8382e..3071ca1 100644
> > --- a/qemu-char.c
> > +++ b/qemu-char.c
> > @@ -110,19 +110,9 @@ void qemu_chr_be_event(CharDriverState *s, int event)
> >      s->chr_event(s->handler_opaque, event);
> >  }
> >  
> > -static gboolean qemu_chr_be_generic_open_bh(gpointer opaque)
> > -{
> > -    CharDriverState *s = opaque;
> > -    qemu_chr_be_event(s, CHR_EVENT_OPENED);
> > -    s->idle_tag = 0;
> > -    return FALSE;
> > -}
> > -
> >  void qemu_chr_be_generic_open(CharDriverState *s)
> >  {
> > -    if (s->idle_tag == 0) {
> > -        s->idle_tag = g_idle_add(qemu_chr_be_generic_open_bh, s);
> > -    }
> > +    qemu_chr_be_event(s, CHR_EVENT_OPENED);
> >  }
> >  
> >  int qemu_chr_fe_write(CharDriverState *s, const uint8_t *buf, int len)
> > @@ -247,6 +237,7 @@ static CharDriverState *qemu_chr_open_null(void)
> >  
> >      chr = g_malloc0(sizeof(CharDriverState));
> >      chr->chr_write = null_chr_write;
> > +    chr->suppress_be_open_on_init = true;
> >      return chr;
> >  }
> >  
> > @@ -504,8 +495,6 @@ static CharDriverState *qemu_chr_open_mux(CharDriverState *drv)
> >      /* Frontend guest-open / -close notification is not support with muxes */
> >      chr->chr_set_fe_open = NULL;
> >  
> > -    /* Muxes are always open on creation */
> > -    qemu_chr_be_generic_open(chr);
> >  
> >      return chr;
> >  }
> > @@ -883,8 +872,6 @@ static CharDriverState *qemu_chr_open_fd(int fd_in, int fd_out)
> >      chr->chr_update_read_handler = fd_chr_update_read_handler;
> >      chr->chr_close = fd_chr_close;
> >  
> > -    qemu_chr_be_generic_open(chr);
> > -
> >      return chr;
> >  }
> >  
> > @@ -1243,6 +1230,7 @@ static CharDriverState *qemu_chr_open_pty(const char *id,
> >      chr->chr_update_read_handler = pty_chr_update_read_handler;
> >      chr->chr_close = pty_chr_close;
> >      chr->chr_add_watch = pty_chr_add_watch;
> > +    chr->suppress_be_open_on_init = true;
> >  
> >      s->fd = io_channel_from_fd(master_fd);
> >      s->timer_tag = 0;
> > @@ -1594,8 +1582,7 @@ static CharDriverState *qemu_chr_open_pp_fd(int fd)
> >      chr->chr_ioctl = pp_ioctl;
> >      chr->chr_close = pp_close;
> >      chr->opaque = drv;
> > -
> > -    qemu_chr_be_generic_open(chr);
> > +    chr->suppress_be_open_on_init = true;
> >  
> >      return chr;
> >  }
> > @@ -1650,6 +1637,7 @@ static CharDriverState *qemu_chr_open_pp_fd(int fd)
> >      chr->opaque = (void *)(intptr_t)fd;
> >      chr->chr_write = null_chr_write;
> >      chr->chr_ioctl = pp_ioctl;
> > +    chr->suppress_be_open_on_init = true;
> >      return chr;
> >  }
> >  #endif
> > @@ -1880,7 +1868,6 @@ static CharDriverState *qemu_chr_open_win_path(const char *filename)
> >          g_free(chr);
> >          return NULL;
> >      }
> > -    qemu_chr_be_generic_open(chr);
> >      return chr;
> >  }
> >  
> > @@ -1980,7 +1967,6 @@ static CharDriverState *qemu_chr_open_pipe(ChardevHostdev *opts)
> >          g_free(chr);
> >          return NULL;
> >      }
> > -    qemu_chr_be_generic_open(chr);
> >      return chr;
> >  }
> >  
> > @@ -1994,7 +1980,6 @@ static CharDriverState *qemu_chr_open_win_file(HANDLE fd_out)
> >      s->hcom = fd_out;
> >      chr->opaque = s;
> >      chr->chr_write = win_chr_write;
> > -    qemu_chr_be_generic_open(chr);
> >      return chr;
> >  }
> >  
> > @@ -2329,6 +2314,8 @@ static CharDriverState *qemu_chr_open_udp_fd(int fd)
> >      chr->chr_write = udp_chr_write;
> >      chr->chr_update_read_handler = udp_chr_update_read_handler;
> >      chr->chr_close = udp_chr_close;
> > +    /* be isn't opened until we get a connection */
> > +    chr->suppress_be_open_on_init = true;
> >      return chr;
> >  }
> >  
> > @@ -2731,6 +2718,8 @@ static CharDriverState *qemu_chr_open_socket_fd(int fd, bool do_nodelay,
> >      chr->get_msgfd = tcp_get_msgfd;
> >      chr->chr_add_client = tcp_chr_add_client;
> >      chr->chr_add_watch = tcp_chr_add_watch;
> > +    /* be isn't opened until we get a connection */
> > +    chr->suppress_be_open_on_init = true;
> >  
> >      if (is_listen) {
> >          s->listen_fd = fd;
> > @@ -3327,6 +3316,12 @@ CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
> >      if (!chr->filename)
> >          chr->filename = g_strdup(qemu_opt_get(opts, "backend"));
> >      chr->init = init;
> > +    /* if we didn't create the chardev via qmp_chardev_add, we
> > +     * need to send the OPENED event here
> > +     */
> > +    if (!chr->suppress_be_open_on_init) {
> > +        qemu_chr_be_event(chr, CHR_EVENT_OPENED);
> > +    }
> >      QTAILQ_INSERT_TAIL(&chardevs, chr, next);
> >  
> >      if (qemu_opt_get_bool(opts, "mux", 0)) {
> > @@ -3803,6 +3798,9 @@ ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend,
> >          chr->label = g_strdup(id);
> >          chr->avail_connections =
> >              (backend->kind == CHARDEV_BACKEND_KIND_MUX) ? MAX_MUX : 1;
> > +        if (!chr->suppress_be_open_on_init) {
> > +            qemu_chr_be_event(chr, CHR_EVENT_OPENED);
> > +        }
> >          QTAILQ_INSERT_TAIL(&chardevs, chr, next);
> >          return ret;
> >      } else {
> > diff --git a/ui/console.c b/ui/console.c
> > index b30853f..54b192d 100644
> > --- a/ui/console.c
> > +++ b/ui/console.c
> > @@ -1746,7 +1746,6 @@ static void text_console_do_init(CharDriverState *chr, DisplayState *ds)
> >          s->t_attrib = s->t_attrib_default;
> >      }
> >  
> > -    qemu_chr_be_generic_open(chr);
> >      if (chr->init)
> >          chr->init(chr);
> >  }
> > diff --git a/ui/gtk.c b/ui/gtk.c
> > index 52c3f95..71b2497 100644
> > --- a/ui/gtk.c
> > +++ b/ui/gtk.c
> > @@ -1214,7 +1214,6 @@ static GSList *gd_vc_init(GtkDisplayState *s, VirtualConsole *vc, int index, GSL
> >  
> >      gtk_menu_shell_append(GTK_MENU_SHELL(view_menu), vc->menu_item);
> >  
> > -    qemu_chr_be_generic_open(vc->chr);
> >      if (vc->chr->init) {
> >          vc->chr->init(vc->chr);
> >      }
> > -- 
> > 1.7.9.5
>