hw/core/qdev-properties-system.c - qemu - Git at Google

 /*
  * 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-properties.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 "chardev/char-fe.h"
 #include "sysemu/iothread.h"
 #include "sysemu/tpm_backend.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 do_parse_drive(DeviceState *dev, const char *str, void **ptr,
                            const char *propname, bool iothread, Error **errp)
 {
     BlockBackend *blk;
     bool blk_created = false;
     int ret;

     blk = blk_by_name(str);
     if (!blk) {
         BlockDriverState *bs = bdrv_lookup_bs(NULL, str, NULL);
         if (bs) {
             /*
              * If the device supports iothreads, it will make sure to move the
              * block node to the right AioContext if necessary (or fail if this
              * isn't possible because of other users). Devices that are not
              * aware of iothreads require their BlockBackends to be in the main
              * AioContext.
              */
             AioContext *ctx = iothread ? bdrv_get_aio_context(bs) :
                                          qemu_get_aio_context();
             blk = blk_new(ctx, 0, BLK_PERM_ALL);
             blk_created = true;

             ret = blk_insert_bs(blk, bs, errp);
             if (ret < 0) {
                 goto fail;
             }
         }
     }
     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 parse_drive(DeviceState *dev, const char *str, void **ptr,
                         const char *propname, Error **errp)
 {
     do_parse_drive(dev, str, ptr, propname, false, errp);
 }

 static void parse_drive_iothread(DeviceState *dev, const char *str, void **ptr,
                                  const char *propname, Error **errp)
 {
     do_parse_drive(dev, str, ptr, propname, true, errp);
 }

 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) {
         AioContext *ctx = blk_get_aio_context(*ptr);

         aio_context_acquire(ctx);
         blockdev_auto_del(*ptr);
         blk_detach_dev(*ptr, dev);
         aio_context_release(ctx);
     }
 }

 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);
 }

 static void set_drive_iothread(Object *obj, Visitor *v, const char *name,
                                void *opaque, Error **errp)
 {
     set_pointer(obj, v, opaque, parse_drive_iothread, name, errp);
 }

 const 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,
 };

 const PropertyInfo qdev_prop_drive_iothread = {
     .name  = "str",
     .description = "Node name or ID of a block device to use as a backend",
     .get   = get_drive,
     .set   = set_drive_iothread,
     .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, false);
 }

 const 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]->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);
 }

 const PropertyInfo qdev_prop_netdev = {
     .name  = "str",
     .description = "ID of a netdev to use as a backend",
     .get   = get_netdev,
     .set   = set_netdev,
 };


 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) {
             const 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;
 }
	/*
	* 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-properties.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 "chardev/char-fe.h"
	#include "sysemu/iothread.h"
	#include "sysemu/tpm_backend.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 do_parse_drive(DeviceState dev, const char str, void **ptr,
	const char propname, bool iothread, Error *errp)
	{
	BlockBackend *blk;
	bool blk_created = false;
	int ret;

	blk = blk_by_name(str);
	if (!blk) {
	BlockDriverState *bs = bdrv_lookup_bs(NULL, str, NULL);
	if (bs) {
	/*
	* If the device supports iothreads, it will make sure to move the
	* block node to the right AioContext if necessary (or fail if this
	* isn't possible because of other users). Devices that are not
	* aware of iothreads require their BlockBackends to be in the main
	* AioContext.
	*/
	AioContext *ctx = iothread ? bdrv_get_aio_context(bs) :
	qemu_get_aio_context();
	blk = blk_new(ctx, 0, BLK_PERM_ALL);
	blk_created = true;

	ret = blk_insert_bs(blk, bs, errp);
	if (ret < 0) {
	goto fail;
	}
	}
	}
	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 parse_drive(DeviceState dev, const char str, void **ptr,
	const char propname, Error *errp)
	{
	do_parse_drive(dev, str, ptr, propname, false, errp);
	}

	static void parse_drive_iothread(DeviceState dev, const char str, void **ptr,
	const char propname, Error *errp)
	{
	do_parse_drive(dev, str, ptr, propname, true, errp);
	}

	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) {
	AioContext ctx = blk_get_aio_context(ptr);

	aio_context_acquire(ctx);
	blockdev_auto_del(*ptr);
	blk_detach_dev(*ptr, dev);
	aio_context_release(ctx);
	}
	}

	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);
	}

	static void set_drive_iothread(Object obj, Visitor v, const char *name,
	void opaque, Error *errp)
	{
	set_pointer(obj, v, opaque, parse_drive_iothread, name, errp);
	}

	const 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,
	};

	const PropertyInfo qdev_prop_drive_iothread = {
	.name = "str",
	.description = "Node name or ID of a block device to use as a backend",
	.get = get_drive,
	.set = set_drive_iothread,
	.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, false);
	}

	const 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]->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);
	}

	const PropertyInfo qdev_prop_netdev = {
	.name = "str",
	.description = "ID of a netdev to use as a backend",
	.get = get_netdev,
	.set = set_netdev,
	};


	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) {
	const 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;
	}