qemu-patch-raspberry4/hw/core/qdev-properties-system.c
Kevin Wolf 6d0eb64d5c block: Add permissions to blk_new()
We want every user to be specific about the permissions it needs, so
we'll pass the initial permissions as parameters to blk_new(). A user
only needs to call blk_set_perm() if it wants to change the permissions
after the fact.

The permissions are stored in the BlockBackend and applied whenever a
BlockDriverState should be attached in blk_insert_bs().

This does not include actually choosing the right set of permissions
everywhere yet. Instead, the usual FIXME comment is added to each place
and will be addressed in individual patches.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
2017-02-28 20:40:36 +01:00

442 lines
11 KiB
C

/*
* qdev property parsing
* (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/error.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, name, &p, 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, name, &str, &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;
bool blk_created = false;
blk = blk_by_name(str);
if (!blk) {
BlockDriverState *bs = bdrv_lookup_bs(NULL, str, NULL);
if (bs) {
/* FIXME Use real permissions */
blk = blk_new(0, BLK_PERM_ALL);
blk_insert_bs(blk, bs);
blk_created = true;
}
}
if (!blk) {
error_setg(errp, "Property '%s.%s' can't find value '%s'",
object_get_typename(OBJECT(dev)), propname, str);
goto fail;
}
if (blk_attach_dev(blk, dev) < 0) {
DriveInfo *dinfo = blk_legacy_dinfo(blk);
if (dinfo && 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);
}
goto fail;
}
*ptr = blk;
fail:
if (blk_created) {
/* If we need to keep a reference, blk_attach_dev() took it */
blk_unref(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) {
blockdev_auto_del(*ptr);
blk_detach_dev(*ptr, dev);
}
}
static char *print_drive(void *ptr)
{
const char *name;
name = blk_name(ptr);
if (!*name) {
BlockDriverState *bs = blk_bs(ptr);
if (bs) {
name = bdrv_get_node_name(bs);
}
}
return g_strdup(name);
}
static void get_drive(Object *obj, Visitor *v, const char *name, void *opaque,
Error **errp)
{
get_pointer(obj, v, opaque, print_drive, name, errp);
}
static void set_drive(Object *obj, Visitor *v, const char *name, void *opaque,
Error **errp)
{
set_pointer(obj, v, opaque, parse_drive, name, errp);
}
PropertyInfo qdev_prop_drive = {
.name = "str",
.description = "Node name or ID of a block device to use as a backend",
.get = get_drive,
.set = set_drive,
.release = release_drive,
};
/* --- character device --- */
static void get_chr(Object *obj, Visitor *v, const char *name, void *opaque,
Error **errp)
{
DeviceState *dev = DEVICE(obj);
CharBackend *be = qdev_get_prop_ptr(dev, opaque);
char *p;
p = g_strdup(be->chr && be->chr->label ? be->chr->label : "");
visit_type_str(v, name, &p, errp);
g_free(p);
}
static void set_chr(Object *obj, Visitor *v, const char *name, void *opaque,
Error **errp)
{
DeviceState *dev = DEVICE(obj);
Error *local_err = NULL;
Property *prop = opaque;
CharBackend *be = qdev_get_prop_ptr(dev, prop);
Chardev *s;
char *str;
if (dev->realized) {
qdev_prop_set_after_realize(dev, name, errp);
return;
}
visit_type_str(v, name, &str, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (!*str) {
g_free(str);
be->chr = NULL;
return;
}
s = qemu_chr_find(str);
if (s == NULL) {
error_setg(errp, "Property '%s.%s' can't find value '%s'",
object_get_typename(obj), prop->name, str);
} else if (!qemu_chr_fe_init(be, s, errp)) {
error_prepend(errp, "Property '%s.%s' can't take value '%s': ",
object_get_typename(obj), prop->name, str);
}
g_free(str);
}
static void release_chr(Object *obj, const char *name, void *opaque)
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
CharBackend *be = qdev_get_prop_ptr(dev, prop);
qemu_chr_fe_deinit(be);
}
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, const char *name,
void *opaque, 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, name, &p, errp);
g_free(p);
}
static void set_netdev(Object *obj, Visitor *v, const char *name,
void *opaque, 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, name, &str, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
queues = qemu_find_net_clients_except(str, peers,
NET_CLIENT_DRIVER_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, const char *name, void *opaque,
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, name, &id, errp);
}
static void set_vlan(Object *obj, Visitor *v, const char *name, void *opaque,
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, name, &id, &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)
{
const char *ref = "";
if (value) {
ref = blk_name(value);
if (!*ref) {
BlockDriverState *bs = blk_bs(value);
if (bs) {
ref = bdrv_get_node_name(bs);
}
}
}
object_property_set_str(OBJECT(dev), ref, name, errp);
}
void qdev_prop_set_chr(DeviceState *dev, const char *name,
Chardev *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;
}