[PATCH] monitor/hmp: schedule qemu_chr_fe_accept_input() after read

["Volker Rümelin" <vr_qemu@t-online.de>]

Since commit 584af1f1d9 (ui/gtk: add a keyboard fifo to the VTE
consoles) a GTK VTE console chardev backend relies on the
connected chardev frontend to call qemu_chr_fe_accept_input()
whenever it can receive new characters. The HMP monitor doesn't
do this. It only schedules a call to qemu_chr_fe_accept_input()
after it handled a HMP command in monitor_command_cb().

This is a problem if you paste a few characters into the GTK
monitor console. Even entering a UTF-8 multibyte character leads
to the same problem.

Schedule a call to qemu_chr_fe_accept_input() after handling the
received bytes to fix the HMP monitor.

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
---
 monitor/hmp.c              |  1 +
 monitor/monitor-internal.h |  1 +
 monitor/monitor.c          | 19 +++++++++++++++++--
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/monitor/hmp.c b/monitor/hmp.c
index d50c3124e1..470f56a71d 100644
--- a/monitor/hmp.c
+++ b/monitor/hmp.c
@@ -1349,6 +1349,7 @@ static void monitor_read(void *opaque, const uint8_t *buf, int size)
         for (i = 0; i < size; i++) {
             readline_handle_byte(mon->rs, buf[i]);
         }
+        monitor_accept_input(&mon->common);
     } else {
         if (size == 0 || buf[size - 1] != 0) {
             monitor_printf(&mon->common, "corrupted command\n");
diff --git a/monitor/monitor-internal.h b/monitor/monitor-internal.h
index 9c3a09cb01..af33c3c617 100644
--- a/monitor/monitor-internal.h
+++ b/monitor/monitor-internal.h
@@ -170,6 +170,7 @@ int monitor_puts(Monitor *mon, const char *str);
 void monitor_data_init(Monitor *mon, bool is_qmp, bool skip_flush,
                        bool use_io_thread);
 void monitor_data_destroy(Monitor *mon);
+void monitor_accept_input(Monitor *mon);
 int monitor_can_read(void *opaque);
 void monitor_list_append(Monitor *mon);
 void monitor_fdsets_cleanup(void);
diff --git a/monitor/monitor.c b/monitor/monitor.c
index 46a171bca6..8e3cf4ad98 100644
--- a/monitor/monitor.c
+++ b/monitor/monitor.c
@@ -519,13 +519,28 @@ int monitor_suspend(Monitor *mon)
     return 0;
 }
 
-static void monitor_accept_input(void *opaque)
+static void monitor_accept_input_bh(void *opaque)
 {
     Monitor *mon = opaque;
 
     qemu_chr_fe_accept_input(&mon->chr);
 }
 
+void monitor_accept_input(Monitor *mon)
+{
+    if (!qatomic_mb_read(&mon->suspend_cnt)) {
+        AioContext *ctx;
+
+        if (mon->use_io_thread) {
+            ctx = iothread_get_aio_context(mon_iothread);
+        } else {
+            ctx = qemu_get_aio_context();
+        }
+
+        aio_bh_schedule_oneshot(ctx, monitor_accept_input_bh, mon);
+    }
+}
+
 void monitor_resume(Monitor *mon)
 {
     if (monitor_is_hmp_non_interactive(mon)) {
@@ -547,7 +562,7 @@ void monitor_resume(Monitor *mon)
             readline_show_prompt(hmp_mon->rs);
         }
 
-        aio_bh_schedule_oneshot(ctx, monitor_accept_input, mon);
+        aio_bh_schedule_oneshot(ctx, monitor_accept_input_bh, mon);
     }
 
     trace_monitor_suspend(mon, -1);
-- 
2.26.2