default devices: core code & serial lines.
Qemu creates a default serial line for you in case you didn't specify
one on the command line. Right now this is tied to the '-serial
<chardev>' command line switch, which in turn causes trouble if you are
creating your serial line via '-device isa-serial,<props>'.
This patch adds a variable default_serial which says whenever a default
serial line should be added. It is enabled by default. It is cleared
when qemu finds '-serial' or '-device isa-serial' on the command line.
Part of the patch is some infrastructure for the '-device $driver'
checking (default_driver_check function) which will also be used by the
other patches of this series.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/vl.c b/vl.c
index 333780f..ef9e480 100644
--- a/vl.c
+++ b/vl.c
@@ -271,6 +271,30 @@
static QEMUBootSetHandler *boot_set_handler;
static void *boot_set_opaque;
+static int default_serial = 1;
+
+static struct {
+ const char *driver;
+ int *flag;
+} default_list[] = {
+ { .driver = "isa-serial", .flag = &default_serial },
+};
+
+static int default_driver_check(QemuOpts *opts, void *opaque)
+{
+ const char *driver = qemu_opt_get(opts, "driver");
+ int i;
+
+ if (!driver)
+ return 0;
+ for (i = 0; i < ARRAY_SIZE(default_list); i++) {
+ if (strcmp(default_list[i].driver, driver) != 0)
+ continue;
+ *(default_list[i].flag) = 0;
+ }
+ return 0;
+}
+
/***********************************************************/
/* x86 ISA bus support */
@@ -4600,6 +4624,7 @@
enum {
DEV_USB, /* -usbdevice */
DEV_BT, /* -bt */
+ DEV_SERIAL, /* -serial */
} type;
const char *cmdline;
QTAILQ_ENTRY(device_config) next;
@@ -4631,6 +4656,50 @@
return 0;
}
+static void serial_monitor_mux(const char *monitor_devices[])
+{
+ struct device_config *serial;
+ const char *devname;
+
+ if (strcmp(monitor_devices[0],"stdio") != 0)
+ return;
+ QTAILQ_FOREACH(serial, &device_configs, next) {
+ if (serial->type != DEV_SERIAL)
+ continue;
+ devname = serial->cmdline;
+ if (devname && !strcmp(devname,"mon:stdio")) {
+ monitor_devices[0] = NULL;
+ break;
+ } else if (devname && !strcmp(devname,"stdio")) {
+ monitor_devices[0] = NULL;
+ serial->cmdline = "mon:stdio";
+ break;
+ }
+ }
+}
+
+static int serial_parse(const char *devname)
+{
+ static int index = 0;
+ char label[32];
+
+ if (strcmp(devname, "none") == 0)
+ return 0;
+ if (index == MAX_SERIAL_PORTS) {
+ fprintf(stderr, "qemu: too many serial ports\n");
+ exit(1);
+ }
+ snprintf(label, sizeof(label), "serial%d", index);
+ serial_hds[index] = qemu_chr_open(label, devname, NULL);
+ if (!serial_hds[index]) {
+ fprintf(stderr, "qemu: could not open serial device '%s': %s\n",
+ devname, strerror(errno));
+ return -1;
+ }
+ index++;
+ return 0;
+}
+
int main(int argc, char **argv, char **envp)
{
const char *gdbstub_dev = NULL;
@@ -4649,8 +4718,6 @@
CharDriverState *monitor_hds[MAX_MONITOR_DEVICES];
const char *monitor_devices[MAX_MONITOR_DEVICES];
int monitor_device_index;
- const char *serial_devices[MAX_SERIAL_PORTS];
- int serial_device_index;
const char *parallel_devices[MAX_PARALLEL_PORTS];
int parallel_device_index;
const char *virtio_consoles[MAX_VIRTIO_CONSOLES];
@@ -4720,11 +4787,6 @@
cyls = heads = secs = 0;
translation = BIOS_ATA_TRANSLATION_AUTO;
- serial_devices[0] = "vc:80Cx24C";
- for(i = 1; i < MAX_SERIAL_PORTS; i++)
- serial_devices[i] = NULL;
- serial_device_index = 0;
-
parallel_devices[0] = "vc:80Cx24C";
for(i = 1; i < MAX_PARALLEL_PORTS; i++)
parallel_devices[i] = NULL;
@@ -5172,12 +5234,8 @@
}
break;
case QEMU_OPTION_serial:
- if (serial_device_index >= MAX_SERIAL_PORTS) {
- fprintf(stderr, "qemu: too many serial ports\n");
- exit(1);
- }
- serial_devices[serial_device_index] = optarg;
- serial_device_index++;
+ add_device_config(DEV_SERIAL, optarg);
+ default_serial = 0;
break;
case QEMU_OPTION_watchdog:
if (watchdog) {
@@ -5478,14 +5536,19 @@
exit(1);
}
+ qemu_opts_foreach(&qemu_device_opts, default_driver_check, NULL, 0);
+
if (display_type == DT_NOGRAPHIC) {
- if (serial_device_index == 0)
- serial_devices[0] = "stdio";
+ if (default_serial)
+ add_device_config(DEV_SERIAL, "stdio");
if (parallel_device_index == 0)
parallel_devices[0] = "null";
if (strncmp(monitor_devices[0], "vc", 2) == 0) {
monitor_devices[0] = "stdio";
}
+ } else {
+ if (default_serial)
+ add_device_config(DEV_SERIAL, "vc:80Cx24C");
}
if (qemu_opts_foreach(&qemu_chardev_opts, chardev_init_func, NULL, 1) != 0)
@@ -5637,19 +5700,7 @@
ram_load, NULL);
/* Maintain compatibility with multiple stdio monitors */
- if (!strcmp(monitor_devices[0],"stdio")) {
- for (i = 0; i < MAX_SERIAL_PORTS; i++) {
- const char *devname = serial_devices[i];
- if (devname && !strcmp(devname,"mon:stdio")) {
- monitor_devices[0] = NULL;
- break;
- } else if (devname && !strcmp(devname,"stdio")) {
- monitor_devices[0] = NULL;
- serial_devices[i] = "mon:stdio";
- break;
- }
- }
- }
+ serial_monitor_mux(monitor_devices);
if (nb_numa_nodes > 0) {
int i;
@@ -5711,19 +5762,8 @@
}
}
- for(i = 0; i < MAX_SERIAL_PORTS; i++) {
- const char *devname = serial_devices[i];
- if (devname && strcmp(devname, "none")) {
- char label[32];
- snprintf(label, sizeof(label), "serial%d", i);
- serial_hds[i] = qemu_chr_open(label, devname, NULL);
- if (!serial_hds[i]) {
- fprintf(stderr, "qemu: could not open serial device '%s': %s\n",
- devname, strerror(errno));
- exit(1);
- }
- }
- }
+ if (foreach_device_config(DEV_SERIAL, serial_parse) < 0)
+ exit(1);
for(i = 0; i < MAX_PARALLEL_PORTS; i++) {
const char *devname = parallel_devices[i];
