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authorMichael Roth <mdroth@linux.vnet.ibm.com>2013-07-30 13:04:22 -0500
committerAnthony Liguori <aliguori@us.ibm.com>2013-07-30 18:48:21 -0500
commit7b7ab18d0b9769b5f39e663fa55caed461b1202e (patch)
tree74ae15cdfacae193d2006a580d4f67dccb4666d7 /qemu-char.c
parent5fe0d351b3a7caf77f899db804d09e4553329c84 (diff)
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chardev: fix CHR_EVENT_OPENED events for mux chardevs
As of bd5c51ee6c4f1c79cae5ad2516d711a27b4ea8ec, chardevs no longer use bottom-halves to issue CHR_EVENT_OPENED events. To maintain past semantics, we instead defer the CHR_EVENT_OPENED events toward the end of chardev initialization. For muxes, this isn't good enough, since a range of FEs must be able to attach to the mux prior to any CHR_EVENT_OPENED being issued, else each FE will immediately print it's initial output (prompts, banners, etc.) just prior to us switching to the next FE as part of initialization. The is new and confusing behavior for users, as they'll see output for things like the HMP monitor, even though their the current mux focus may be a guest serial port with potentially no output. We fix this by further deferring CHR_EVENT_OPENED events for FEs associated with muxes until after machine init by flagging mux chardevs with 'explicit_be_open', which suppresses emission of CHR_EVENT_OPENED events until we explicitly set the mux as opened later. Currently, we must defer till after machine init since we potentially associate FEs with muxes as part of realize (for instance, serial_isa_realizefn). Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Message-id: 1375207462-8141-1-git-send-email-mdroth@linux.vnet.ibm.com Cc: qemu-stable@nongnu.org Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'qemu-char.c')
-rw-r--r--qemu-char.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/qemu-char.c b/qemu-char.c
index 3f606c9..16f3ad7 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -476,6 +476,46 @@ static void mux_chr_update_read_handler(CharDriverState *chr)
mux_chr_send_event(d, d->focus, CHR_EVENT_MUX_IN);
}
+static bool muxes_realized;
+
+/**
+ * Called after processing of default and command-line-specified
+ * chardevs to deliver CHR_EVENT_OPENED events to any FEs attached
+ * to a mux chardev. This is done here to ensure that
+ * output/prompts/banners are only displayed for the FE that has
+ * focus when initial command-line processing/machine init is
+ * completed.
+ *
+ * After this point, any new FE attached to any new or existing
+ * mux will receive CHR_EVENT_OPENED notifications for the BE
+ * immediately.
+ */
+static void muxes_realize_done(Notifier *notifier, void *unused)
+{
+ CharDriverState *chr;
+
+ QTAILQ_FOREACH(chr, &chardevs, next) {
+ if (chr->is_mux) {
+ MuxDriver *d = chr->opaque;
+ int i;
+
+ /* send OPENED to all already-attached FEs */
+ for (i = 0; i < d->mux_cnt; i++) {
+ mux_chr_send_event(d, i, CHR_EVENT_OPENED);
+ }
+ /* mark mux as OPENED so any new FEs will immediately receive
+ * OPENED event
+ */
+ qemu_chr_be_generic_open(chr);
+ }
+ }
+ muxes_realized = true;
+}
+
+static Notifier muxes_realize_notify = {
+ .notify = muxes_realize_done,
+};
+
static CharDriverState *qemu_chr_open_mux(CharDriverState *drv)
{
CharDriverState *chr;
@@ -492,6 +532,11 @@ static CharDriverState *qemu_chr_open_mux(CharDriverState *drv)
chr->chr_accept_input = mux_chr_accept_input;
/* Frontend guest-open / -close notification is not support with muxes */
chr->chr_set_fe_open = NULL;
+ /* only default to opened state if we've realized the initial
+ * set of muxes
+ */
+ chr->explicit_be_open = muxes_realized ? 0 : 1;
+ chr->is_mux = 1;
return chr;
}
@@ -3798,6 +3843,11 @@ static void register_types(void)
/* Bug-compatibility: */
register_char_driver_qapi("memory", CHARDEV_BACKEND_KIND_MEMORY,
qemu_chr_parse_ringbuf);
+ /* this must be done after machine init, since we register FEs with muxes
+ * as part of realize functions like serial_isa_realizefn when -nographic
+ * is specified
+ */
+ qemu_add_machine_init_done_notifier(&muxes_realize_notify);
}
type_init(register_types);