[Qemu-devel] [FOR 0.12 PATCH v4 22/22] Set default console to virtio on S390x

[Gerd Hoffmann <kraxel@redhat.com>]

All "normal" system emulation targets in qemu I'm aware of display
output on either VGA or serial output.

Our S390x virtio machine doesn't have such kind of legacy hardware. So
instead we need to default to a virtio console.

Add flags to QEMUMachine to indicate which kind of default devices make
sense for the machine in question.  Use it for S390x: enable virtcon,
disable serial, parallel and vga.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/boards.h      |    4 ++++
 hw/s390-virtio.c |    4 ++++
 vl.c             |   19 ++++++++++++++++++-
 3 files changed, 26 insertions(+), 1 deletions(-)

diff --git a/hw/boards.h b/hw/boards.h
index 7a0f20f..8fe0fbc 100644
--- a/hw/boards.h
+++ b/hw/boards.h
@@ -19,6 +19,10 @@ typedef struct QEMUMachine {
     QEMUMachineInitFunc *init;
     int use_scsi;
     int max_cpus;
+    int no_serial:1,
+        no_parallel:1,
+        use_virtcon:1,
+        no_vga:1;
     int is_default;
     GlobalProperty *compat_props;
     struct QEMUMachine *next;
diff --git a/hw/s390-virtio.c b/hw/s390-virtio.c
index cc21ee6..51c032a 100644
--- a/hw/s390-virtio.c
+++ b/hw/s390-virtio.c
@@ -243,6 +243,10 @@ static QEMUMachine s390_machine = {
     .alias = "s390",
     .desc = "VirtIO based S390 machine",
     .init = s390_init,
+    .no_serial = 1,
+    .no_parallel = 1,
+    .use_virtcon = 1.
+    .no_vga = 1,
     .max_cpus = 255,
     .is_default = 1,
 };
diff --git a/vl.c b/vl.c
index b4138be..d028931 100644
--- a/vl.c
+++ b/vl.c
@@ -270,7 +270,7 @@ static void *boot_set_opaque;
 
 static int default_serial = 1;
 static int default_parallel = 1;
-static int default_virtcon = 0;
+static int default_virtcon = 1;
 static int default_monitor = 1;
 static int default_vga = 1;
 static int default_drive = 1;
@@ -5629,14 +5629,31 @@ int main(int argc, char **argv, char **envp)
 
     qemu_opts_foreach(&qemu_device_opts, default_driver_check, NULL, 0);
 
+    if (machine->no_serial) {
+        default_serial = 0;
+    }
+    if (machine->no_parallel) {
+        default_parallel = 0;
+    }
+    if (!machine->use_virtcon) {
+        default_virtcon = 0;
+    }
+    if (machine->no_vga) {
+        default_vga = 0;
+    }
+
     if (display_type == DT_NOGRAPHIC) {
         if (default_parallel)
             add_device_config(DEV_PARALLEL, "null");
         if (default_serial && default_monitor) {
             add_device_config(DEV_SERIAL, "mon:stdio");
+        } else if (default_virtcon && default_monitor) {
+            add_device_config(DEV_VIRTCON, "mon:stdio");
         } else {
             if (default_serial)
                 add_device_config(DEV_SERIAL, "stdio");
+            if (default_virtcon)
+                add_device_config(DEV_VIRTCON, "stdio");
             if (default_monitor)
                 monitor_parse("stdio", "readline");
         }
-- 
1.6.5.2