qemu/hw/core/qdev-properties-system.c

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/*
* qdev property parsing and global properties
* (parts specific for qemu-system-*)
*
* This file is based on code from hw/qdev-properties.c from
* commit 074a86fccd185616469dfcdc0e157f438aebba18,
* Copyright (c) Gerd Hoffmann <kraxel@redhat.com> and other contributors.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "net/net.h"
#include "hw/qdev.h"
#include "qapi/qmp/qerror.h"
#include "sysemu/block-backend.h"
#include "sysemu/blockdev.h"
#include "hw/block/block.h"
#include "net/hub.h"
#include "qapi/visitor.h"
#include "sysemu/char.h"
#include "sysemu/iothread.h"
static void get_pointer(Object *obj, Visitor *v, Property *prop,
char *(*print)(void *ptr),
const char *name, Error **errp)
{
DeviceState *dev = DEVICE(obj);
void **ptr = qdev_get_prop_ptr(dev, prop);
char *p;
p = *ptr ? print(*ptr) : g_strdup("");
visit_type_str(v, &p, name, errp);
g_free(p);
}
static void set_pointer(Object *obj, Visitor *v, Property *prop,
void (*parse)(DeviceState *dev, const char *str,
void **ptr, const char *propname,
Error **errp),
const char *name, Error **errp)
{
DeviceState *dev = DEVICE(obj);
Error *local_err = NULL;
void **ptr = qdev_get_prop_ptr(dev, prop);
char *str;
if (dev->realized) {
qdev_prop_set_after_realize(dev, name, errp);
return;
}
visit_type_str(v, &str, name, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (!*str) {
g_free(str);
*ptr = NULL;
return;
}
parse(dev, str, ptr, prop->name, errp);
g_free(str);
}
/* --- drive --- */
static void parse_drive(DeviceState *dev, const char *str, void **ptr,
const char *propname, Error **errp)
{
BlockBackend *blk;
blk = blk_by_name(str);
if (!blk) {
error_setg(errp, "Property '%s.%s' can't find value '%s'",
object_get_typename(OBJECT(dev)), propname, str);
return;
}
if (blk_attach_dev(blk, dev) < 0) {
qdev-properties-system: Improve error message for drive assignment conflict If the user forgot if=none on their drive specification they're likely to get an error message because the drive is assigned once automatically by QEMU and once by the manual id=/drive= user command line specification. Improve the error message produced in this case to explicitly guide the user towards if=none. We rephrase the "drive conflict but not for an if=something" error as well to keep the wording in line. The two cases that change are: (1) Drive specified as to be auto-connected and also manually connected (and the board does handle this if= type): qemu-system-x86_64 -nodefaults -display none \ -drive if=scsi,file=tmp.qcow2,id=foo -device ide-hd,drive=foo Previously: qemu-system-x86_64: -device ide-hd,drive=foo: Property 'ide-hd.drive' can't take value 'foo', it's in use Now: qemu-system-x86_64: -device ide-hd,drive=foo: Drive 'foo' is already in use because it has been automatically connected to another device (did you need 'if=none' in the drive options?) (2) Drive specified to be manually connected in two different ways: qemu-system-x86_64 -nodefaults -display none \ -drive if=none,file=tmp.qcow2,id=foo -device ide-hd,drive=foo \ -device ide-hd,drive=foo Previously: qemu-system-x86_64: -device ide-hd,drive=foo: Property 'ide-hd.drive' can't take value 'foo', it's in use Now: qemu-system-x86_64: -device ide-hd,drive=foo: Drive 'foo' is already in use by another device Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 1435068107-12594-3-git-send-email-peter.maydell@linaro.org
2015-06-26 16:22:36 +03:00
DriveInfo *dinfo = blk_legacy_dinfo(blk);
if (dinfo->type != IF_NONE) {
error_setg(errp, "Drive '%s' is already in use because "
"it has been automatically connected to another "
"device (did you need 'if=none' in the drive options?)",
str);
} else {
error_setg(errp, "Drive '%s' is already in use by another device",
str);
}
return;
}
*ptr = blk;
}
static void release_drive(Object *obj, const char *name, void *opaque)
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
BlockBackend **ptr = qdev_get_prop_ptr(dev, prop);
if (*ptr) {
blk_detach_dev(*ptr, dev);
blockdev_auto_del(*ptr);
}
}
static char *print_drive(void *ptr)
{
return g_strdup(blk_name(ptr));
}
static void get_drive(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
get_pointer(obj, v, opaque, print_drive, name, errp);
}
static void set_drive(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
set_pointer(obj, v, opaque, parse_drive, name, errp);
}
PropertyInfo qdev_prop_drive = {
.name = "str",
.description = "ID of a drive to use as a backend",
.get = get_drive,
.set = set_drive,
.release = release_drive,
};
/* --- character device --- */
static void parse_chr(DeviceState *dev, const char *str, void **ptr,
const char *propname, Error **errp)
{
CharDriverState *chr = qemu_chr_find(str);
if (chr == NULL) {
error_setg(errp, "Property '%s.%s' can't find value '%s'",
object_get_typename(OBJECT(dev)), propname, str);
return;
}
if (qemu_chr_fe_claim(chr) != 0) {
error_setg(errp, "Property '%s.%s' can't take value '%s', it's in use",
object_get_typename(OBJECT(dev)), propname, str);
return;
}
*ptr = chr;
}
static void release_chr(Object *obj, const char *name, void *opaque)
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
CharDriverState **ptr = qdev_get_prop_ptr(dev, prop);
CharDriverState *chr = *ptr;
if (chr) {
qemu_chr_add_handlers(chr, NULL, NULL, NULL, NULL);
qemu_chr_fe_release(chr);
}
}
static char *print_chr(void *ptr)
{
CharDriverState *chr = ptr;
const char *val = chr->label ? chr->label : "";
return g_strdup(val);
}
static void get_chr(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
get_pointer(obj, v, opaque, print_chr, name, errp);
}
static void set_chr(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
set_pointer(obj, v, opaque, parse_chr, name, errp);
}
PropertyInfo qdev_prop_chr = {
.name = "str",
.description = "ID of a chardev to use as a backend",
.get = get_chr,
.set = set_chr,
.release = release_chr,
};
/* --- netdev device --- */
static void get_netdev(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
char *p = g_strdup(peers_ptr->ncs[0] ? peers_ptr->ncs[0]->name : "");
visit_type_str(v, &p, name, errp);
g_free(p);
}
static void set_netdev(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
NetClientState **ncs = peers_ptr->ncs;
NetClientState *peers[MAX_QUEUE_NUM];
Error *local_err = NULL;
int queues, err = 0, i = 0;
char *str;
if (dev->realized) {
qdev_prop_set_after_realize(dev, name, errp);
return;
}
visit_type_str(v, &str, name, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
queues = qemu_find_net_clients_except(str, peers,
NET_CLIENT_OPTIONS_KIND_NIC,
MAX_QUEUE_NUM);
if (queues == 0) {
err = -ENOENT;
goto out;
}
if (queues > MAX_QUEUE_NUM) {
error_setg(errp, "queues of backend '%s'(%d) exceeds QEMU limitation(%d)",
str, queues, MAX_QUEUE_NUM);
goto out;
}
for (i = 0; i < queues; i++) {
if (peers[i] == NULL) {
err = -ENOENT;
goto out;
}
if (peers[i]->peer) {
err = -EEXIST;
goto out;
}
if (ncs[i]) {
err = -EINVAL;
goto out;
}
ncs[i] = peers[i];
ncs[i]->queue_index = i;
}
peers_ptr->queues = queues;
out:
error_set_from_qdev_prop_error(errp, err, dev, prop, str);
g_free(str);
}
PropertyInfo qdev_prop_netdev = {
.name = "str",
.description = "ID of a netdev to use as a backend",
.get = get_netdev,
.set = set_netdev,
};
/* --- vlan --- */
static int print_vlan(DeviceState *dev, Property *prop, char *dest, size_t len)
{
NetClientState **ptr = qdev_get_prop_ptr(dev, prop);
if (*ptr) {
int id;
if (!net_hub_id_for_client(*ptr, &id)) {
return snprintf(dest, len, "%d", id);
}
}
return snprintf(dest, len, "<null>");
}
static void get_vlan(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
NetClientState **ptr = qdev_get_prop_ptr(dev, prop);
int32_t id = -1;
if (*ptr) {
int hub_id;
if (!net_hub_id_for_client(*ptr, &hub_id)) {
id = hub_id;
}
}
visit_type_int32(v, &id, name, errp);
}
static void set_vlan(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
NetClientState **ptr = &peers_ptr->ncs[0];
Error *local_err = NULL;
int32_t id;
NetClientState *hubport;
if (dev->realized) {
qdev_prop_set_after_realize(dev, name, errp);
return;
}
visit_type_int32(v, &id, name, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (id == -1) {
*ptr = NULL;
return;
}
if (*ptr) {
error_set_from_qdev_prop_error(errp, -EINVAL, dev, prop, name);
return;
}
hubport = net_hub_port_find(id);
if (!hubport) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
name, prop->info->name);
return;
}
*ptr = hubport;
}
PropertyInfo qdev_prop_vlan = {
.name = "int32",
.description = "Integer VLAN id to connect to",
.print = print_vlan,
.get = get_vlan,
.set = set_vlan,
};
void qdev_prop_set_drive(DeviceState *dev, const char *name,
BlockBackend *value, Error **errp)
{
object_property_set_str(OBJECT(dev), value ? blk_name(value) : "",
name, errp);
}
void qdev_prop_set_chr(DeviceState *dev, const char *name,
CharDriverState *value)
{
assert(!value || value->label);
object_property_set_str(OBJECT(dev),
value ? value->label : "", name, &error_abort);
}
void qdev_prop_set_netdev(DeviceState *dev, const char *name,
NetClientState *value)
{
assert(!value || value->name);
object_property_set_str(OBJECT(dev),
value ? value->name : "", name, &error_abort);
}
void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
{
qdev_prop_set_macaddr(dev, "mac", nd->macaddr.a);
if (nd->netdev) {
qdev_prop_set_netdev(dev, "netdev", nd->netdev);
}
if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
object_property_find(OBJECT(dev), "vectors", NULL)) {
qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
}
nd->instantiated = 1;
}
static int qdev_add_one_global(void *opaque, QemuOpts *opts, Error **errp)
{
GlobalProperty *g;
g = g_malloc0(sizeof(*g));
g->driver = qemu_opt_get(opts, "driver");
g->property = qemu_opt_get(opts, "property");
g->value = qemu_opt_get(opts, "value");
g->user_provided = true;
qdev_prop_register_global(g);
return 0;
}
void qemu_add_globals(void)
{
qemu_opts_foreach(qemu_find_opts("global"),
qdev_add_one_global, NULL, NULL);
}