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/*
* Copyright © 2020, 2021 Oracle and/or its affiliates.
*
* This work is licensed under the terms of the GNU GPL-v2, version 2 or later.
*
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qemu/notify.h"
#include "qom/object_interfaces.h"
#include "io/channel.h"
#include "hw/qdev-core.h"
#include "hw/remote/machine.h"
#include "io/channel-util.h"
#include "qapi/error.h"
#include "system/system.h"
#include "hw/pci/pci.h"
#include "qemu/sockets.h"
#include "monitor/monitor.h"
#define TYPE_REMOTE_OBJECT "x-remote-object"
OBJECT_DECLARE_TYPE(RemoteObject, RemoteObjectClass, REMOTE_OBJECT)
struct RemoteObjectClass {
ObjectClass parent_class;
unsigned int nr_devs;
unsigned int max_devs;
};
struct RemoteObject {
/* private */
Object parent;
Notifier machine_done;
int32_t fd;
char *devid;
QIOChannel *ioc;
DeviceState *dev;
DeviceListener listener;
};
static void remote_object_set_fd(Object *obj, const char *str, Error **errp)
{
ERRP_GUARD();
RemoteObject *o = REMOTE_OBJECT(obj);
int fd = -1;
fd = monitor_fd_param(monitor_cur(), str, errp);
if (fd == -1) {
error_prepend(errp, "Could not parse remote object fd %s:", str);
return;
}
if (!fd_is_socket(fd)) {
error_setg(errp, "File descriptor '%s' is not a socket", str);
close(fd);
return;
}
o->fd = fd;
}
static void remote_object_set_devid(Object *obj, const char *str, Error **errp)
{
RemoteObject *o = REMOTE_OBJECT(obj);
g_free(o->devid);
o->devid = g_strdup(str);
}
static void remote_object_unrealize_listener(DeviceListener *listener,
DeviceState *dev)
{
RemoteObject *o = container_of(listener, RemoteObject, listener);
if (o->dev == dev) {
object_unref(OBJECT(o));
}
}
static void remote_object_machine_done(Notifier *notifier, void *data)
{
RemoteObject *o = container_of(notifier, RemoteObject, machine_done);
DeviceState *dev = NULL;
QIOChannel *ioc = NULL;
Coroutine *co = NULL;
RemoteCommDev *comdev = NULL;
Error *err = NULL;
dev = qdev_find_recursive(sysbus_get_default(), o->devid);
if (!dev || !object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
error_report("%s is not a PCI device", o->devid);
return;
}
ioc = qio_channel_new_fd(o->fd, &err);
if (!ioc) {
error_report_err(err);
return;
}
qio_channel_set_blocking(ioc, false, NULL);
o->dev = dev;
o->listener.unrealize = remote_object_unrealize_listener;
device_listener_register(&o->listener);
/* co-routine should free this. */
comdev = g_new0(RemoteCommDev, 1);
*comdev = (RemoteCommDev) {
.ioc = ioc,
.dev = PCI_DEVICE(dev),
};
co = qemu_coroutine_create(mpqemu_remote_msg_loop_co, comdev);
qemu_coroutine_enter(co);
}
static void remote_object_init(Object *obj)
{
RemoteObjectClass *k = REMOTE_OBJECT_GET_CLASS(obj);
RemoteObject *o = REMOTE_OBJECT(obj);
if (k->nr_devs >= k->max_devs) {
error_report("Reached maximum number of devices: %u", k->max_devs);
return;
}
o->ioc = NULL;
o->fd = -1;
o->devid = NULL;
k->nr_devs++;
o->machine_done.notify = remote_object_machine_done;
qemu_add_machine_init_done_notifier(&o->machine_done);
}
static void remote_object_finalize(Object *obj)
{
RemoteObjectClass *k = REMOTE_OBJECT_GET_CLASS(obj);
RemoteObject *o = REMOTE_OBJECT(obj);
device_listener_unregister(&o->listener);
if (o->ioc) {
qio_channel_shutdown(o->ioc, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
qio_channel_close(o->ioc, NULL);
}
object_unref(OBJECT(o->ioc));
k->nr_devs--;
g_free(o->devid);
}
static void remote_object_class_init(ObjectClass *klass, void *data)
{
RemoteObjectClass *k = REMOTE_OBJECT_CLASS(klass);
/*
* Limit number of supported devices to 1. This is done to avoid devices
* from one VM accessing the RAM of another VM. This is done until we
* start using separate address spaces for individual devices.
*/
k->max_devs = 1;
k->nr_devs = 0;
object_class_property_add_str(klass, "fd", NULL, remote_object_set_fd);
object_class_property_add_str(klass, "devid", NULL,
remote_object_set_devid);
}
static const TypeInfo remote_object_info = {
.name = TYPE_REMOTE_OBJECT,
.parent = TYPE_OBJECT,
.instance_size = sizeof(RemoteObject),
.instance_init = remote_object_init,
.instance_finalize = remote_object_finalize,
.class_size = sizeof(RemoteObjectClass),
.class_init = remote_object_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_USER_CREATABLE },
{ }
}
};
static void register_types(void)
{
type_register_static(&remote_object_info);
}
type_init(register_types);
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