Associate the file descriptor for a PCIDevice in remote process with
DeviceState object.
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
hw/remote/remote-obj.c | 206 +++++++++++++++++++++++++++++++++++++++++++++++++
MAINTAINERS | 1 +
hw/remote/meson.build | 1 +
3 files changed, 208 insertions(+)
create mode 100644 hw/remote/remote-obj.c
diff --git a/hw/remote/remote-obj.c b/hw/remote/remote-obj.c
new file mode 100644
index 0000000..b5573b7
--- /dev/null
+++ b/hw/remote/remote-obj.c
@@ -0,0 +1,206 @@
+/*
+ * Copyright © 2020 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-common.h"
+
+#include "qemu/error-report.h"
+#include "qemu/notify.h"
+#include "qom/object_interfaces.h"
+#include "hw/qdev-core.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 "sysemu/sysemu.h"
+#include "hw/pci/pci.h"
+#include "qemu/sockets.h"
+
+#define TYPE_REMOTE_OBJECT "x-remote-object"
+#define REMOTE_OBJECT(obj) \
+ OBJECT_CHECK(RemoteObject, (obj), TYPE_REMOTE_OBJECT)
+#define REMOTE_OBJECT_GET_CLASS(obj) \
+ OBJECT_GET_CLASS(RemoteObjectClass, (obj), TYPE_REMOTE_OBJECT)
+#define REMOTE_OBJECT_CLASS(klass) \
+ OBJECT_CLASS_CHECK(RemoteObjectClass, (klass), TYPE_REMOTE_OBJECT)
+
+typedef struct {
+ ObjectClass parent_class;
+
+ unsigned int nr_devs;
+ unsigned int max_devs;
+} RemoteObjectClass;
+
+typedef struct {
+ /* private */
+ Object parent;
+
+ Notifier machine_done;
+
+ int32_t fd;
+ char *devid;
+
+ QIOChannel *ioc;
+
+ DeviceState *dev;
+ DeviceListener listener;
+} RemoteObject;
+
+static void remote_object_set_fd(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
+{
+ RemoteObject *o = REMOTE_OBJECT(obj);
+ int32_t value;
+
+ if (!visit_type_int32(v, name, &value, errp)) {
+ return;
+ }
+
+ if (!fd_is_socket(value)) {
+ o->fd = -1;
+ error_setg(errp, "File descriptor %d is not a socket", value);
+ return;
+ }
+
+ o->fd = value;
+}
+
+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_release(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_release;
+ 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(klass, "fd", "int32_t", NULL,
+ remote_object_set_fd, NULL, NULL);
Let's be consistent with pci-proxy-dev, and make it a string property that is parsed with monitor_fd_param()
+ 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);
diff --git a/MAINTAINERS b/MAINTAINERS
index 4f2cd91..f049059 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3160,6 +3160,7 @@ F: include/hw/remote/machine.h
F: hw/remote/mpqemu-link.c
F: include/hw/remote/mpqemu-link.h
F: hw/remote/message.c
+F: hw/remote/remote-obj.c
Build and test automation
-------------------------
diff --git a/hw/remote/meson.build b/hw/remote/meson.build
index 9f5c57f..71d0a56 100644
--- a/hw/remote/meson.build
+++ b/hw/remote/meson.build
@@ -3,5 +3,6 @@ remote_ss = ss.source_set()
remote_ss.add(when: 'CONFIG_MULTIPROCESS', if_true: files('machine.c'))
remote_ss.add(when: 'CONFIG_MULTIPROCESS', if_true: files('mpqemu-link.c'))
remote_ss.add(when: 'CONFIG_MULTIPROCESS', if_true: files('message.c'))
+remote_ss.add(when: 'CONFIG_MULTIPROCESS', if_true: files('remote-obj.c'))
softmmu_ss.add_all(when: 'CONFIG_MULTIPROCESS', if_true: remote_ss)
--
1.8.3.1