This patch adds infrastructure and command line option for setting
global defaults for device properties, i.e. you can for example use
-global virtio-blk-pci.vectors=0
to turn off msi by default for all virtio block devices. The config
file syntax is:
[global]
driver = "virtio-blk-pci"
property = "vectors"
value = "0"
This can also be used to set properties for devices which are not
created via -device but implicitly via machine init, i.e.
-global isa-fdc,driveA=<name>
This patch uses the mechanism which configures properties for the
compatibility machine types (pc-0.10 & friends). The command line
takes precedence over the machine type values.
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
qemu-config.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
qemu-config.h | 2 +
qemu-options.hx | 3 ++
vl.c | 6 +++++
4 files changed, 67 insertions(+), 0 deletions(-)
diff --git a/qemu-config.c b/qemu-config.c
index 590fc05..e12b66c 100644
--- a/qemu-config.c
+++ b/qemu-config.c
@@ -2,6 +2,7 @@
#include "qemu-option.h"
#include "qemu-config.h"
#include "sysemu.h"
+#include "hw/qdev.h"
QemuOptsList qemu_drive_opts = {
.name = "drive",
@@ -202,6 +203,24 @@ QemuOptsList qemu_rtc_opts = {
},
};
+QemuOptsList qemu_global_opts = {
+ .name = "global",
+ .head = QTAILQ_HEAD_INITIALIZER(qemu_global_opts.head),
+ .desc = {
+ {
+ .name = "driver",
+ .type = QEMU_OPT_STRING,
+ },{
+ .name = "property",
+ .type = QEMU_OPT_STRING,
+ },{
+ .name = "value",
+ .type = QEMU_OPT_STRING,
+ },
+ { /* end if list */ }
+ },
+};
+
static QemuOptsList *lists[] = {
&qemu_drive_opts,
&qemu_chardev_opts,
@@ -209,6 +228,7 @@ static QemuOptsList *lists[] = {
&qemu_netdev_opts,
&qemu_net_opts,
&qemu_rtc_opts,
+ &qemu_global_opts,
NULL,
};
@@ -257,6 +277,42 @@ int qemu_set_option(const char *str)
return 0;
}
+int qemu_global_option(const char *str)
+{
+ char driver[64], property[64];
+ QemuOpts *opts;
+ int rc, offset;
+
+ rc = sscanf(str, "%63[^.].%63[^=]%n", driver, property, &offset);
+ if (rc < 2 || str[offset] != '=') {
+ qemu_error("can't parse: \"%s\"\n", str);
+ return -1;
+ }
+
+ opts = qemu_opts_create(&qemu_global_opts, NULL, 0);
+ qemu_opt_set(opts, "driver", driver);
+ qemu_opt_set(opts, "property", property);
+ qemu_opt_set(opts, "value", str+offset+1);
+ return 0;
+}
+
+static int qemu_add_one_global(QemuOpts *opts, void *opaque)
+{
+ GlobalProperty *g;
+
+ g = qemu_mallocz(sizeof(*g));
+ g->driver = qemu_opt_get(opts, "driver");
+ g->property = qemu_opt_get(opts, "property");
+ g->value = qemu_opt_get(opts, "value");
+ qdev_prop_register_global(g);
+ return 0;
+}
+
+void qemu_add_globals(void)
+{
+ qemu_opts_foreach(&qemu_global_opts, qemu_add_one_global, NULL, 0);
+}
+
struct ConfigWriteData {
QemuOptsList *list;
FILE *fp;
diff --git a/qemu-config.h b/qemu-config.h
index b564851..6246e76 100644
--- a/qemu-config.h
+++ b/qemu-config.h
@@ -9,6 +9,8 @@ extern QemuOptsList qemu_net_opts;
extern QemuOptsList qemu_rtc_opts;
int qemu_set_option(const char *str);
+int qemu_global_option(const char *str);
+void qemu_add_globals(void);
void qemu_config_write(FILE *fp);
int qemu_config_parse(FILE *fp);
diff --git a/qemu-options.hx b/qemu-options.hx
index b65fd74..420b7d8 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -109,6 +109,9 @@ DEF("set", HAS_ARG, QEMU_OPTION_set,
"-set group.id.arg=value\n"
" set <arg> parameter for item <id> of type <group>\n"
" i.e. -set drive.$id.file=/path/to/image\n")
+DEF("global", HAS_ARG, QEMU_OPTION_global,
+ "-global driver.property=value\n"
+ " set a global default for a driver property\n")
STEXI
@item -drive @var{option}[,@var{option}[,@var{option}[,...]]]
diff --git a/vl.c b/vl.c
index d52b1cc..4911fe5 100644
--- a/vl.c
+++ b/vl.c
@@ -4786,6 +4786,10 @@ int main(int argc, char **argv, char **envp)
if (qemu_set_option(optarg) != 0)
exit(1);
break;
+ case QEMU_OPTION_global:
+ if (qemu_global_option(optarg) != 0)
+ exit(1);
+ break;
case QEMU_OPTION_mtdblock:
drive_add(optarg, MTD_ALIAS);
break;
@@ -5700,6 +5704,8 @@ int main(int argc, char **argv, char **envp)
if (machine->compat_props) {
qdev_prop_register_global_list(machine->compat_props);
}
+ qemu_add_globals();
+
machine->init(ram_size, boot_devices,
kernel_filename, kernel_cmdline, initrd_filename, cpu_model);
--
1.6.2.5
