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qemu/softmmu/qdev-monitor.c
Damien Hedde 4a1d937796 softmmu/qdev-monitor: add error handling in qdev_set_id 
qdev_set_id() is mostly used when the user adds a device (using
-device cli option or device_add qmp command). This commit adds
an error parameter to handle the case where the given id is
already taken.

Also document the function and add a return value in order to
be able to capture success/failure: the function now returns the
id in case of success, or NULL in case of failure.

The commit modifies the 2 calling places (qdev-monitor and
xen-legacy-backend) to add the error object parameter.

Note that the id is, right now, guaranteed to be unique because
all ids came from the "device" QemuOptsList where the id is used
as key. This addition is a preparation for a future commit which
will relax the uniqueness.

Signed-off-by: Damien Hedde <damien.hedde@greensocs.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20211008133442.141332-10-kwolf@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2021-10-15 16:08:46 +02:00

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/*
* Dynamic device configuration and creation.
*
* Copyright (c) 2009 CodeSourcery
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "hw/sysbus.h"
#include "monitor/hmp.h"
#include "monitor/monitor.h"
#include "monitor/qdev.h"
#include "sysemu/arch_init.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-qdev.h"
#include "qapi/qmp/dispatch.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qerror.h"
#include "qapi/qmp/qstring.h"
#include "qapi/qobject-input-visitor.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#include "qemu/help_option.h"
#include "qemu/option.h"
#include "qemu/qemu-print.h"
#include "qemu/option_int.h"
#include "sysemu/block-backend.h"
#include "migration/misc.h"
#include "migration/migration.h"
#include "qemu/cutils.h"
#include "hw/qdev-properties.h"
#include "hw/clock.h"
/*
* Aliases were a bad idea from the start. Let's keep them
* from spreading further.
*/
typedef struct QDevAlias
{
const char *typename;
const char *alias;
uint32_t arch_mask;
} QDevAlias;
/* default virtio transport per architecture */
#define QEMU_ARCH_VIRTIO_PCI (QEMU_ARCH_ALPHA | QEMU_ARCH_ARM | \
QEMU_ARCH_HPPA | QEMU_ARCH_I386 | \
QEMU_ARCH_MIPS | QEMU_ARCH_PPC | \
QEMU_ARCH_RISCV | QEMU_ARCH_SH4 | \
QEMU_ARCH_SPARC | QEMU_ARCH_XTENSA)
#define QEMU_ARCH_VIRTIO_CCW (QEMU_ARCH_S390X)
#define QEMU_ARCH_VIRTIO_MMIO (QEMU_ARCH_M68K)
/* Please keep this table sorted by typename. */
static const QDevAlias qdev_alias_table[] = {
{ "AC97", "ac97" }, /* -soundhw name */
{ "e1000", "e1000-82540em" },
{ "ES1370", "es1370" }, /* -soundhw name */
{ "ich9-ahci", "ahci" },
{ "lsi53c895a", "lsi" },
{ "virtio-9p-device", "virtio-9p", QEMU_ARCH_VIRTIO_MMIO },
{ "virtio-9p-ccw", "virtio-9p", QEMU_ARCH_VIRTIO_CCW },
{ "virtio-9p-pci", "virtio-9p", QEMU_ARCH_VIRTIO_PCI },
{ "virtio-balloon-device", "virtio-balloon", QEMU_ARCH_VIRTIO_MMIO },
{ "virtio-balloon-ccw", "virtio-balloon", QEMU_ARCH_VIRTIO_CCW },
{ "virtio-balloon-pci", "virtio-balloon", QEMU_ARCH_VIRTIO_PCI },
{ "virtio-blk-device", "virtio-blk", QEMU_ARCH_VIRTIO_MMIO },
{ "virtio-blk-ccw", "virtio-blk", QEMU_ARCH_VIRTIO_CCW },
{ "virtio-blk-pci", "virtio-blk", QEMU_ARCH_VIRTIO_PCI },
{ "virtio-gpu-device", "virtio-gpu", QEMU_ARCH_VIRTIO_MMIO },
{ "virtio-gpu-ccw", "virtio-gpu", QEMU_ARCH_VIRTIO_CCW },
{ "virtio-gpu-pci", "virtio-gpu", QEMU_ARCH_VIRTIO_PCI },
{ "virtio-input-host-device", "virtio-input-host", QEMU_ARCH_VIRTIO_MMIO },
{ "virtio-input-host-ccw", "virtio-input-host", QEMU_ARCH_VIRTIO_CCW },
{ "virtio-input-host-pci", "virtio-input-host", QEMU_ARCH_VIRTIO_PCI },
{ "virtio-iommu-pci", "virtio-iommu", QEMU_ARCH_VIRTIO_PCI },
{ "virtio-keyboard-device", "virtio-keyboard", QEMU_ARCH_VIRTIO_MMIO },
{ "virtio-keyboard-ccw", "virtio-keyboard", QEMU_ARCH_VIRTIO_CCW },
{ "virtio-keyboard-pci", "virtio-keyboard", QEMU_ARCH_VIRTIO_PCI },
{ "virtio-mouse-device", "virtio-mouse", QEMU_ARCH_VIRTIO_MMIO },
{ "virtio-mouse-ccw", "virtio-mouse", QEMU_ARCH_VIRTIO_CCW },
{ "virtio-mouse-pci", "virtio-mouse", QEMU_ARCH_VIRTIO_PCI },
{ "virtio-net-device", "virtio-net", QEMU_ARCH_VIRTIO_MMIO },
{ "virtio-net-ccw", "virtio-net", QEMU_ARCH_VIRTIO_CCW },
{ "virtio-net-pci", "virtio-net", QEMU_ARCH_VIRTIO_PCI },
{ "virtio-rng-device", "virtio-rng", QEMU_ARCH_VIRTIO_MMIO },
{ "virtio-rng-ccw", "virtio-rng", QEMU_ARCH_VIRTIO_CCW },
{ "virtio-rng-pci", "virtio-rng", QEMU_ARCH_VIRTIO_PCI },
{ "virtio-scsi-device", "virtio-scsi", QEMU_ARCH_VIRTIO_MMIO },
{ "virtio-scsi-ccw", "virtio-scsi", QEMU_ARCH_VIRTIO_CCW },
{ "virtio-scsi-pci", "virtio-scsi", QEMU_ARCH_VIRTIO_PCI },
{ "virtio-serial-device", "virtio-serial", QEMU_ARCH_VIRTIO_MMIO },
{ "virtio-serial-ccw", "virtio-serial", QEMU_ARCH_VIRTIO_CCW },
{ "virtio-serial-pci", "virtio-serial", QEMU_ARCH_VIRTIO_PCI},
{ "virtio-tablet-device", "virtio-tablet", QEMU_ARCH_VIRTIO_MMIO },
{ "virtio-tablet-ccw", "virtio-tablet", QEMU_ARCH_VIRTIO_CCW },
{ "virtio-tablet-pci", "virtio-tablet", QEMU_ARCH_VIRTIO_PCI },
{ }
};
static const char *qdev_class_get_alias(DeviceClass *dc)
{
const char *typename = object_class_get_name(OBJECT_CLASS(dc));
int i;
for (i = 0; qdev_alias_table[i].typename; i++) {
if (qdev_alias_table[i].arch_mask &&
!(qdev_alias_table[i].arch_mask & arch_type)) {
continue;
}
if (strcmp(qdev_alias_table[i].typename, typename) == 0) {
return qdev_alias_table[i].alias;
}
}
return NULL;
}
static bool qdev_class_has_alias(DeviceClass *dc)
{
return (qdev_class_get_alias(dc) != NULL);
}
static void qdev_print_devinfo(DeviceClass *dc)
{
qemu_printf("name \"%s\"", object_class_get_name(OBJECT_CLASS(dc)));
if (dc->bus_type) {
qemu_printf(", bus %s", dc->bus_type);
}
if (qdev_class_has_alias(dc)) {
qemu_printf(", alias \"%s\"", qdev_class_get_alias(dc));
}
if (dc->desc) {
qemu_printf(", desc \"%s\"", dc->desc);
}
if (!dc->user_creatable) {
qemu_printf(", no-user");
}
qemu_printf("\n");
}
static void qdev_print_devinfos(bool show_no_user)
{
static const char *cat_name[DEVICE_CATEGORY_MAX + 1] = {
[DEVICE_CATEGORY_BRIDGE] = "Controller/Bridge/Hub",
[DEVICE_CATEGORY_USB] = "USB",
[DEVICE_CATEGORY_STORAGE] = "Storage",
[DEVICE_CATEGORY_NETWORK] = "Network",
[DEVICE_CATEGORY_INPUT] = "Input",
[DEVICE_CATEGORY_DISPLAY] = "Display",
[DEVICE_CATEGORY_SOUND] = "Sound",
[DEVICE_CATEGORY_MISC] = "Misc",
[DEVICE_CATEGORY_CPU] = "CPU",
[DEVICE_CATEGORY_MAX] = "Uncategorized",
};
GSList *list, *elt;
int i;
bool cat_printed;
module_load_qom_all();
list = object_class_get_list_sorted(TYPE_DEVICE, false);
for (i = 0; i <= DEVICE_CATEGORY_MAX; i++) {
cat_printed = false;
for (elt = list; elt; elt = elt->next) {
DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data,
TYPE_DEVICE);
if ((i < DEVICE_CATEGORY_MAX
? !test_bit(i, dc->categories)
: !bitmap_empty(dc->categories, DEVICE_CATEGORY_MAX))
|| (!show_no_user
&& !dc->user_creatable)) {
continue;
}
if (!cat_printed) {
qemu_printf("%s%s devices:\n", i ? "\n" : "", cat_name[i]);
cat_printed = true;
}
qdev_print_devinfo(dc);
}
}
g_slist_free(list);
}
static int set_property(void *opaque, const char *name, const char *value,
Error **errp)
{
Object *obj = opaque;
QString *val;
Visitor *v;
int ret;
if (strcmp(name, "driver") == 0)
return 0;
if (strcmp(name, "bus") == 0)
return 0;
val = qstring_from_str(value);
v = qobject_input_visitor_new_keyval(QOBJECT(val));
if (!object_property_set(obj, name, v, errp)) {
ret = -1;
goto out;
}
ret = 0;
out:
visit_free(v);
qobject_unref(val);
return ret;
}
static const char *find_typename_by_alias(const char *alias)
{
int i;
for (i = 0; qdev_alias_table[i].alias; i++) {
if (qdev_alias_table[i].arch_mask &&
!(qdev_alias_table[i].arch_mask & arch_type)) {
continue;
}
if (strcmp(qdev_alias_table[i].alias, alias) == 0) {
return qdev_alias_table[i].typename;
}
}
return NULL;
}
static DeviceClass *qdev_get_device_class(const char **driver, Error **errp)
{
ObjectClass *oc;
DeviceClass *dc;
const char *original_name = *driver;
oc = module_object_class_by_name(*driver);
if (!oc) {
const char *typename = find_typename_by_alias(*driver);
if (typename) {
*driver = typename;
oc = module_object_class_by_name(*driver);
}
}
if (!object_class_dynamic_cast(oc, TYPE_DEVICE)) {
if (*driver != original_name) {
error_setg(errp, "'%s' (alias '%s') is not a valid device model"
" name", original_name, *driver);
} else {
error_setg(errp, "'%s' is not a valid device model name", *driver);
}
return NULL;
}
if (object_class_is_abstract(oc)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
"a non-abstract device type");
return NULL;
}
dc = DEVICE_CLASS(oc);
if (!dc->user_creatable ||
(phase_check(PHASE_MACHINE_READY) && !dc->hotpluggable)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
"a pluggable device type");
return NULL;
}
return dc;
}
int qdev_device_help(QemuOpts *opts)
{
Error *local_err = NULL;
const char *driver;
ObjectPropertyInfoList *prop_list;
ObjectPropertyInfoList *prop;
GPtrArray *array;
int i;
driver = qemu_opt_get(opts, "driver");
if (driver && is_help_option(driver)) {
qdev_print_devinfos(false);
return 1;
}
if (!driver || !qemu_opt_has_help_opt(opts)) {
return 0;
}
if (!object_class_by_name(driver)) {
const char *typename = find_typename_by_alias(driver);
if (typename) {
driver = typename;
}
}
prop_list = qmp_device_list_properties(driver, &local_err);
if (local_err) {
goto error;
}
if (prop_list) {
qemu_printf("%s options:\n", driver);
} else {
qemu_printf("There are no options for %s.\n", driver);
}
array = g_ptr_array_new();
for (prop = prop_list; prop; prop = prop->next) {
g_ptr_array_add(array,
object_property_help(prop->value->name,
prop->value->type,
prop->value->default_value,
prop->value->description));
}
g_ptr_array_sort(array, (GCompareFunc)qemu_pstrcmp0);
for (i = 0; i < array->len; i++) {
qemu_printf("%s\n", (char *)array->pdata[i]);
}
g_ptr_array_set_free_func(array, g_free);
g_ptr_array_free(array, true);
qapi_free_ObjectPropertyInfoList(prop_list);
return 1;
error:
error_report_err(local_err);
return 1;
}
static Object *qdev_get_peripheral(void)
{
static Object *dev;
if (dev == NULL) {
dev = container_get(qdev_get_machine(), "/peripheral");
}
return dev;
}
static Object *qdev_get_peripheral_anon(void)
{
static Object *dev;
if (dev == NULL) {
dev = container_get(qdev_get_machine(), "/peripheral-anon");
}
return dev;
}
static void qbus_error_append_bus_list_hint(DeviceState *dev,
Error *const *errp)
{
BusState *child;
const char *sep = " ";
error_append_hint(errp, "child buses at \"%s\":",
dev->id ? dev->id : object_get_typename(OBJECT(dev)));
QLIST_FOREACH(child, &dev->child_bus, sibling) {
error_append_hint(errp, "%s\"%s\"", sep, child->name);
sep = ", ";
}
error_append_hint(errp, "\n");
}
static void qbus_error_append_dev_list_hint(BusState *bus,
Error *const *errp)
{
BusChild *kid;
const char *sep = " ";
error_append_hint(errp, "devices at \"%s\":", bus->name);
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
error_append_hint(errp, "%s\"%s\"", sep,
object_get_typename(OBJECT(dev)));
if (dev->id) {
error_append_hint(errp, "/\"%s\"", dev->id);
}
sep = ", ";
}
error_append_hint(errp, "\n");
}
static BusState *qbus_find_bus(DeviceState *dev, char *elem)
{
BusState *child;
QLIST_FOREACH(child, &dev->child_bus, sibling) {
if (strcmp(child->name, elem) == 0) {
return child;
}
}
return NULL;
}
static DeviceState *qbus_find_dev(BusState *bus, char *elem)
{
BusChild *kid;
/*
* try to match in order:
* (1) instance id, if present
* (2) driver name
* (3) driver alias, if present
*/
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
if (dev->id && strcmp(dev->id, elem) == 0) {
return dev;
}
}
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
if (strcmp(object_get_typename(OBJECT(dev)), elem) == 0) {
return dev;
}
}
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
DeviceClass *dc = DEVICE_GET_CLASS(dev);
if (qdev_class_has_alias(dc) &&
strcmp(qdev_class_get_alias(dc), elem) == 0) {
return dev;
}
}
return NULL;
}
static inline bool qbus_is_full(BusState *bus)
{
BusClass *bus_class;
if (bus->full) {
return true;
}
bus_class = BUS_GET_CLASS(bus);
return bus_class->max_dev && bus->num_children >= bus_class->max_dev;
}
/*
* Search the tree rooted at @bus for a bus.
* If @name, search for a bus with that name. Note that bus names
* need not be unique. Yes, that's screwed up.
* Else search for a bus that is a subtype of @bus_typename.
* If more than one exists, prefer one that can take another device.
* Return the bus if found, else %NULL.
*/
static BusState *qbus_find_recursive(BusState *bus, const char *name,
const char *bus_typename)
{
BusChild *kid;
BusState *pick, *child, *ret;
bool match;
assert(name || bus_typename);
if (name) {
match = !strcmp(bus->name, name);
} else {
match = !!object_dynamic_cast(OBJECT(bus), bus_typename);
}
if (match && !qbus_is_full(bus)) {
return bus; /* root matches and isn't full */
}
pick = match ? bus : NULL;
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
QLIST_FOREACH(child, &dev->child_bus, sibling) {
ret = qbus_find_recursive(child, name, bus_typename);
if (ret && !qbus_is_full(ret)) {
return ret; /* a descendant matches and isn't full */
}
if (ret && !pick) {
pick = ret;
}
}
}
/* root or a descendant matches, but is full */
return pick;
}
static BusState *qbus_find(const char *path, Error **errp)
{
DeviceState *dev;
BusState *bus;
char elem[128];
int pos, len;
/* find start element */
if (path[0] == '/') {
bus = sysbus_get_default();
pos = 0;
} else {
if (sscanf(path, "%127[^/]%n", elem, &len) != 1) {
assert(!path[0]);
elem[0] = len = 0;
}
bus = qbus_find_recursive(sysbus_get_default(), elem, NULL);
if (!bus) {
error_setg(errp, "Bus '%s' not found", elem);
return NULL;
}
pos = len;
}
for (;;) {
assert(path[pos] == '/' || !path[pos]);
while (path[pos] == '/') {
pos++;
}
if (path[pos] == '\0') {
break;
}
/* find device */
if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
g_assert_not_reached();
elem[0] = len = 0;
}
pos += len;
dev = qbus_find_dev(bus, elem);
if (!dev) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", elem);
qbus_error_append_dev_list_hint(bus, errp);
return NULL;
}
assert(path[pos] == '/' || !path[pos]);
while (path[pos] == '/') {
pos++;
}
if (path[pos] == '\0') {
/* last specified element is a device. If it has exactly
* one child bus accept it nevertheless */
if (dev->num_child_bus == 1) {
bus = QLIST_FIRST(&dev->child_bus);
break;
}
if (dev->num_child_bus) {
error_setg(errp, "Device '%s' has multiple child buses",
elem);
qbus_error_append_bus_list_hint(dev, errp);
} else {
error_setg(errp, "Device '%s' has no child bus", elem);
}
return NULL;
}
/* find bus */
if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
g_assert_not_reached();
elem[0] = len = 0;
}
pos += len;
bus = qbus_find_bus(dev, elem);
if (!bus) {
error_setg(errp, "Bus '%s' not found", elem);
qbus_error_append_bus_list_hint(dev, errp);
return NULL;
}
}
if (qbus_is_full(bus)) {
error_setg(errp, "Bus '%s' is full", path);
return NULL;
}
return bus;
}
/* Takes ownership of @id, will be freed when deleting the device */
const char *qdev_set_id(DeviceState *dev, char *id, Error **errp)
{
ObjectProperty *prop;
assert(!dev->id && !dev->realized);
/*
* object_property_[try_]add_child() below will assert the device
* has no parent
*/
if (id) {
prop = object_property_try_add_child(qdev_get_peripheral(), id,
OBJECT(dev), NULL);
if (prop) {
dev->id = id;
} else {
g_free(id);
error_setg(errp, "Duplicate device ID '%s'", id);
return NULL;
}
} else {
static int anon_count;
gchar *name = g_strdup_printf("device[%d]", anon_count++);
prop = object_property_add_child(qdev_get_peripheral_anon(), name,
OBJECT(dev));
g_free(name);
}
return prop->name;
}
DeviceState *qdev_device_add(QemuOpts *opts, Error **errp)
{
DeviceClass *dc;
const char *driver, *path;
DeviceState *dev = NULL;
BusState *bus = NULL;
driver = qemu_opt_get(opts, "driver");
if (!driver) {
error_setg(errp, QERR_MISSING_PARAMETER, "driver");
return NULL;
}
/* find driver */
dc = qdev_get_device_class(&driver, errp);
if (!dc) {
return NULL;
}
/* find bus */
path = qemu_opt_get(opts, "bus");
if (path != NULL) {
bus = qbus_find(path, errp);
if (!bus) {
return NULL;
}
if (!object_dynamic_cast(OBJECT(bus), dc->bus_type)) {
error_setg(errp, "Device '%s' can't go on %s bus",
driver, object_get_typename(OBJECT(bus)));
return NULL;
}
} else if (dc->bus_type != NULL) {
bus = qbus_find_recursive(sysbus_get_default(), NULL, dc->bus_type);
if (!bus || qbus_is_full(bus)) {
error_setg(errp, "No '%s' bus found for device '%s'",
dc->bus_type, driver);
return NULL;
}
}
if (qemu_opt_get(opts, "failover_pair_id")) {
if (!opts->id) {
error_setg(errp, "Device with failover_pair_id don't have id");
return NULL;
}
if (qdev_should_hide_device(opts)) {
if (bus && !qbus_is_hotpluggable(bus)) {
error_setg(errp, QERR_BUS_NO_HOTPLUG, bus->name);
}
return NULL;
}
}
if (phase_check(PHASE_MACHINE_READY) && bus && !qbus_is_hotpluggable(bus)) {
error_setg(errp, QERR_BUS_NO_HOTPLUG, bus->name);
return NULL;
}
if (!migration_is_idle()) {
error_setg(errp, "device_add not allowed while migrating");
return NULL;
}
/* create device */
dev = qdev_new(driver);
/* Check whether the hotplug is allowed by the machine */
if (phase_check(PHASE_MACHINE_READY)) {
if (!qdev_hotplug_allowed(dev, errp)) {
goto err_del_dev;
}
if (!bus && !qdev_get_machine_hotplug_handler(dev)) {
/* No bus, no machine hotplug handler --> device is not hotpluggable */
error_setg(errp, "Device '%s' can not be hotplugged on this machine",
driver);
goto err_del_dev;
}
}
/*
* set dev's parent and register its id.
* If it fails it means the id is already taken.
*/
if (!qdev_set_id(dev, g_strdup(qemu_opts_id(opts)), errp)) {
goto err_del_dev;
}
/* set properties */
if (qemu_opt_foreach(opts, set_property, dev, errp)) {
goto err_del_dev;
}
dev->opts = opts;
if (!qdev_realize(DEVICE(dev), bus, errp)) {
dev->opts = NULL;
goto err_del_dev;
}
return dev;
err_del_dev:
if (dev) {
object_unparent(OBJECT(dev));
object_unref(OBJECT(dev));
}
return NULL;
}
#define qdev_printf(fmt, ...) monitor_printf(mon, "%*s" fmt, indent, "", ## __VA_ARGS__)
static void qbus_print(Monitor *mon, BusState *bus, int indent);
static void qdev_print_props(Monitor *mon, DeviceState *dev, Property *props,
int indent)
{
if (!props)
return;
for (; props->name; props++) {
char *value;
char *legacy_name = g_strdup_printf("legacy-%s", props->name);
if (object_property_get_type(OBJECT(dev), legacy_name, NULL)) {
value = object_property_get_str(OBJECT(dev), legacy_name, NULL);
} else {
value = object_property_print(OBJECT(dev), props->name, true,
NULL);
}
g_free(legacy_name);
if (!value) {
continue;
}
qdev_printf("%s = %s\n", props->name,
*value ? value : "<null>");
g_free(value);
}
}
static void bus_print_dev(BusState *bus, Monitor *mon, DeviceState *dev, int indent)
{
BusClass *bc = BUS_GET_CLASS(bus);
if (bc->print_dev) {
bc->print_dev(mon, dev, indent);
}
}
static void qdev_print(Monitor *mon, DeviceState *dev, int indent)
{
ObjectClass *class;
BusState *child;
NamedGPIOList *ngl;
NamedClockList *ncl;
qdev_printf("dev: %s, id \"%s\"\n", object_get_typename(OBJECT(dev)),
dev->id ? dev->id : "");
indent += 2;
QLIST_FOREACH(ngl, &dev->gpios, node) {
if (ngl->num_in) {
qdev_printf("gpio-in \"%s\" %d\n", ngl->name ? ngl->name : "",
ngl->num_in);
}
if (ngl->num_out) {
qdev_printf("gpio-out \"%s\" %d\n", ngl->name ? ngl->name : "",
ngl->num_out);
}
}
QLIST_FOREACH(ncl, &dev->clocks, node) {
g_autofree char *freq_str = clock_display_freq(ncl->clock);
qdev_printf("clock-%s%s \"%s\" freq_hz=%s\n",
ncl->output ? "out" : "in",
ncl->alias ? " (alias)" : "",
ncl->name, freq_str);
}
class = object_get_class(OBJECT(dev));
do {
qdev_print_props(mon, dev, DEVICE_CLASS(class)->props_, indent);
class = object_class_get_parent(class);
} while (class != object_class_by_name(TYPE_DEVICE));
bus_print_dev(dev->parent_bus, mon, dev, indent);
QLIST_FOREACH(child, &dev->child_bus, sibling) {
qbus_print(mon, child, indent);
}
}
static void qbus_print(Monitor *mon, BusState *bus, int indent)
{
BusChild *kid;
qdev_printf("bus: %s\n", bus->name);
indent += 2;
qdev_printf("type %s\n", object_get_typename(OBJECT(bus)));
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
qdev_print(mon, dev, indent);
}
}
#undef qdev_printf
void hmp_info_qtree(Monitor *mon, const QDict *qdict)
{
if (sysbus_get_default())
qbus_print(mon, sysbus_get_default(), 0);
}
void hmp_info_qdm(Monitor *mon, const QDict *qdict)
{
qdev_print_devinfos(true);
}
void qmp_device_add(QDict *qdict, QObject **ret_data, Error **errp)
{
QemuOpts *opts;
DeviceState *dev;
opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, errp);
if (!opts) {
return;
}
if (!monitor_cur_is_qmp() && qdev_device_help(opts)) {
qemu_opts_del(opts);
return;
}
dev = qdev_device_add(opts, errp);
/*
* Drain all pending RCU callbacks. This is done because
* some bus related operations can delay a device removal
* (in this case this can happen if device is added and then
* removed due to a configuration error)
* to a RCU callback, but user might expect that this interface
* will finish its job completely once qmp command returns result
* to the user
*/
drain_call_rcu();
if (!dev) {
qemu_opts_del(opts);
return;
}
object_unref(OBJECT(dev));
}
static DeviceState *find_device_state(const char *id, Error **errp)
{
Object *obj;
DeviceState *dev;
if (id[0] == '/') {
obj = object_resolve_path(id, NULL);
} else {
obj = object_resolve_path_component(qdev_get_peripheral(), id);
}
if (!obj) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", id);
return NULL;
}
dev = (DeviceState *)object_dynamic_cast(obj, TYPE_DEVICE);
if (!dev) {
error_setg(errp, "%s is not a hotpluggable device", id);
return NULL;
}
return dev;
}
void qdev_unplug(DeviceState *dev, Error **errp)
{
DeviceClass *dc = DEVICE_GET_CLASS(dev);
HotplugHandler *hotplug_ctrl;
HotplugHandlerClass *hdc;
Error *local_err = NULL;
if (dev->parent_bus && !qbus_is_hotpluggable(dev->parent_bus)) {
error_setg(errp, QERR_BUS_NO_HOTPLUG, dev->parent_bus->name);
return;
}
if (!dc->hotpluggable) {
error_setg(errp, QERR_DEVICE_NO_HOTPLUG,
object_get_typename(OBJECT(dev)));
return;
}
if (!migration_is_idle() && !dev->allow_unplug_during_migration) {
error_setg(errp, "device_del not allowed while migrating");
return;
}
qdev_hot_removed = true;
hotplug_ctrl = qdev_get_hotplug_handler(dev);
/* hotpluggable device MUST have HotplugHandler, if it doesn't
* then something is very wrong with it */
g_assert(hotplug_ctrl);
/* If device supports async unplug just request it to be done,
* otherwise just remove it synchronously */
hdc = HOTPLUG_HANDLER_GET_CLASS(hotplug_ctrl);
if (hdc->unplug_request) {
hotplug_handler_unplug_request(hotplug_ctrl, dev, &local_err);
} else {
hotplug_handler_unplug(hotplug_ctrl, dev, &local_err);
if (!local_err) {
object_unparent(OBJECT(dev));
}
}
error_propagate(errp, local_err);
}
void qmp_device_del(const char *id, Error **errp)
{
DeviceState *dev = find_device_state(id, errp);
if (dev != NULL) {
if (dev->pending_deleted_event) {
error_setg(errp, "Device %s is already in the "
"process of unplug", id);
return;
}
qdev_unplug(dev, errp);
}
}
void hmp_device_add(Monitor *mon, const QDict *qdict)
{
Error *err = NULL;
qmp_device_add((QDict *)qdict, NULL, &err);
hmp_handle_error(mon, err);
}
void hmp_device_del(Monitor *mon, const QDict *qdict)
{
const char *id = qdict_get_str(qdict, "id");
Error *err = NULL;
qmp_device_del(id, &err);
hmp_handle_error(mon, err);
}
BlockBackend *blk_by_qdev_id(const char *id, Error **errp)
{
DeviceState *dev;
BlockBackend *blk;
dev = find_device_state(id, errp);
if (dev == NULL) {
return NULL;
}
blk = blk_by_dev(dev);
if (!blk) {
error_setg(errp, "Device does not have a block device backend");
}
return blk;
}
QemuOptsList qemu_device_opts = {
.name = "device",
.implied_opt_name = "driver",
.head = QTAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
.desc = {
/*
* no elements => accept any
* sanity checking will happen later
* when setting device properties
*/
{ /* end of list */ }
},
};
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 of list */ }
},
};
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] == '=') {
opts = qemu_opts_create(&qemu_global_opts, NULL, 0, &error_abort);
qemu_opt_set(opts, "driver", driver, &error_abort);
qemu_opt_set(opts, "property", property, &error_abort);
qemu_opt_set(opts, "value", str + offset + 1, &error_abort);
return 0;
}
opts = qemu_opts_parse_noisily(&qemu_global_opts, str, false);
if (!opts) {
return -1;
}
return 0;
}
bool qmp_command_available(const QmpCommand *cmd, Error **errp)
{
if (!phase_check(PHASE_MACHINE_READY) &&
!(cmd->options & QCO_ALLOW_PRECONFIG)) {
error_setg(errp, "The command '%s' is permitted only after machine initialization has completed",
cmd->name);
return false;
}
return true;
}
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