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/**
* QEMU vfio-user-server server object
*
* Copyright © 2022 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.
*
*/
/**
* Usage: add options:
* -machine x-remote,vfio-user=on,auto-shutdown=on
* -device <PCI-device>,id=<pci-dev-id>
* -object x-vfio-user-server,id=<id>,type=unix,path=<socket-path>,
* device=<pci-dev-id>
*
* Note that x-vfio-user-server object must be used with x-remote machine only.
* This server could only support PCI devices for now.
*
* type - SocketAddress type - presently "unix" alone is supported. Required
* option
*
* path - named unix socket, it will be created by the server. It is
* a required option
*
* device - id of a device on the server, a required option. PCI devices
* alone are supported presently.
*/
#include "qemu/osdep.h"
#include "qom/object.h"
#include "qom/object_interfaces.h"
#include "qemu/error-report.h"
#include "trace.h"
#include "sysemu/runstate.h"
#include "hw/boards.h"
#include "hw/remote/machine.h"
#include "qapi/error.h"
#include "qapi/qapi-visit-sockets.h"
#define TYPE_VFU_OBJECT "x-vfio-user-server"
OBJECT_DECLARE_TYPE(VfuObject, VfuObjectClass, VFU_OBJECT)
/**
* VFU_OBJECT_ERROR - reports an error message. If auto_shutdown
* is set, it aborts the machine on error. Otherwise, it logs an
* error message without aborting.
*/
#define VFU_OBJECT_ERROR(o, fmt, ...) \
{ \
if (vfu_object_auto_shutdown()) { \
error_setg(&error_abort, (fmt), ## __VA_ARGS__); \
} else { \
error_report((fmt), ## __VA_ARGS__); \
} \
} \
struct VfuObjectClass {
ObjectClass parent_class;
unsigned int nr_devs;
};
struct VfuObject {
/* private */
Object parent;
SocketAddress *socket;
char *device;
Error *err;
};
static bool vfu_object_auto_shutdown(void)
{
bool auto_shutdown = true;
Error *local_err = NULL;
if (!current_machine) {
return auto_shutdown;
}
auto_shutdown = object_property_get_bool(OBJECT(current_machine),
"auto-shutdown",
&local_err);
/*
* local_err would be set if no such property exists - safe to ignore.
* Unlikely scenario as auto-shutdown is always defined for
* TYPE_REMOTE_MACHINE, and TYPE_VFU_OBJECT only works with
* TYPE_REMOTE_MACHINE
*/
if (local_err) {
auto_shutdown = true;
error_free(local_err);
}
return auto_shutdown;
}
static void vfu_object_set_socket(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
VfuObject *o = VFU_OBJECT(obj);
qapi_free_SocketAddress(o->socket);
o->socket = NULL;
visit_type_SocketAddress(v, name, &o->socket, errp);
if (o->socket->type != SOCKET_ADDRESS_TYPE_UNIX) {
error_setg(errp, "vfu: Unsupported socket type - %s",
SocketAddressType_str(o->socket->type));
qapi_free_SocketAddress(o->socket);
o->socket = NULL;
return;
}
trace_vfu_prop("socket", o->socket->u.q_unix.path);
}
static void vfu_object_set_device(Object *obj, const char *str, Error **errp)
{
VfuObject *o = VFU_OBJECT(obj);
g_free(o->device);
o->device = g_strdup(str);
trace_vfu_prop("device", str);
}
static void vfu_object_init(Object *obj)
{
VfuObjectClass *k = VFU_OBJECT_GET_CLASS(obj);
VfuObject *o = VFU_OBJECT(obj);
k->nr_devs++;
if (!object_dynamic_cast(OBJECT(current_machine), TYPE_REMOTE_MACHINE)) {
error_setg(&o->err, "vfu: %s only compatible with %s machine",
TYPE_VFU_OBJECT, TYPE_REMOTE_MACHINE);
return;
}
}
static void vfu_object_finalize(Object *obj)
{
VfuObjectClass *k = VFU_OBJECT_GET_CLASS(obj);
VfuObject *o = VFU_OBJECT(obj);
k->nr_devs--;
qapi_free_SocketAddress(o->socket);
o->socket = NULL;
g_free(o->device);
o->device = NULL;
if (!k->nr_devs && vfu_object_auto_shutdown()) {
qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
}
}
static void vfu_object_class_init(ObjectClass *klass, void *data)
{
VfuObjectClass *k = VFU_OBJECT_CLASS(klass);
k->nr_devs = 0;
object_class_property_add(klass, "socket", "SocketAddress", NULL,
vfu_object_set_socket, NULL, NULL);
object_class_property_set_description(klass, "socket",
"SocketAddress "
"(ex: type=unix,path=/tmp/sock). "
"Only UNIX is presently supported");
object_class_property_add_str(klass, "device", NULL,
vfu_object_set_device);
object_class_property_set_description(klass, "device",
"device ID - only PCI devices "
"are presently supported");
}
static const TypeInfo vfu_object_info = {
.name = TYPE_VFU_OBJECT,
.parent = TYPE_OBJECT,
.instance_size = sizeof(VfuObject),
.instance_init = vfu_object_init,
.instance_finalize = vfu_object_finalize,
.class_size = sizeof(VfuObjectClass),
.class_init = vfu_object_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_USER_CREATABLE },
{ }
}
};
static void vfu_register_types(void)
{
type_register_static(&vfu_object_info);
}
type_init(vfu_register_types);
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