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From: Jagannathan Raman <jag.raman@oracle.com>
Introduce the vfio-user "proxy": this is the client code responsible for
sending and receiving vfio-user messages across the control socket.
The new files hw/vfio-user/common.[ch] contain some basic plumbing for
managing the proxy; initialize the proxy during realization of the
VFIOUserPCIDevice instance.
Originally-by: John Johnson <john.g.johnson@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Signed-off-by: John Levon <john.levon@nutanix.com>
---
hw/vfio-user/common.c | 171 ++++++++++++++++++++++++++++++++++
hw/vfio-user/common.h | 78 ++++++++++++++++
hw/vfio-user/meson.build | 1 +
hw/vfio-user/pci.c | 18 ++++
include/hw/vfio/vfio-common.h | 2 +
5 files changed, 270 insertions(+)
create mode 100644 hw/vfio-user/common.c
create mode 100644 hw/vfio-user/common.h
diff --git a/hw/vfio-user/common.c b/hw/vfio-user/common.c
new file mode 100644
index 0000000000..e829abccec
--- /dev/null
+++ b/hw/vfio-user/common.c
@@ -0,0 +1,171 @@
+/*
+ * vfio protocol over a UNIX socket.
+ *
+ * Copyright =C2=A9 2018, 2021 Oracle and/or its affiliates.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or late=
r.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include <linux/vfio.h>
+#include <sys/ioctl.h>
+
+#include "hw/hw.h"
+#include "hw/vfio/vfio-common.h"
+#include "io/channel.h"
+#include "io/channel-socket.h"
+#include "io/channel-util.h"
+#include "qapi/error.h"
+#include "qemu/error-report.h"
+#include "qemu/lockable.h"
+#include "qemu/sockets.h"
+#include "system/iothread.h"
+
+#include "common.h"
+
+static IOThread *vfio_user_iothread;
+
+static void vfio_user_shutdown(VFIOUserProxy *proxy);
+
+
+/*
+ * Functions called by main, CPU, or iothread threads
+ */
+
+static void vfio_user_shutdown(VFIOUserProxy *proxy)
+{
+ qio_channel_shutdown(proxy->ioc, QIO_CHANNEL_SHUTDOWN_READ, NULL);
+ qio_channel_set_aio_fd_handler(proxy->ioc, proxy->ctx, NULL,
+ proxy->ctx, NULL, NULL);
+}
+
+/*
+ * Functions only called by iothread
+ */
+
+static void vfio_user_cb(void *opaque)
+{
+ VFIOUserProxy *proxy =3D opaque;
+
+ QEMU_LOCK_GUARD(&proxy->lock);
+
+ proxy->state =3D VFIO_PROXY_CLOSED;
+ qemu_cond_signal(&proxy->close_cv);
+}
+
+
+/*
+ * Functions called by main or CPU threads
+ */
+
+static QLIST_HEAD(, VFIOUserProxy) vfio_user_sockets =3D
+ QLIST_HEAD_INITIALIZER(vfio_user_sockets);
+
+VFIOUserProxy *vfio_user_connect_dev(SocketAddress *addr, Error **errp)
+{
+ VFIOUserProxy *proxy;
+ QIOChannelSocket *sioc;
+ QIOChannel *ioc;
+ char *sockname;
+
+ if (addr->type !=3D SOCKET_ADDRESS_TYPE_UNIX) {
+ error_setg(errp, "vfio_user_connect - bad address family");
+ return NULL;
+ }
+ sockname =3D addr->u.q_unix.path;
+
+ sioc =3D qio_channel_socket_new();
+ ioc =3D QIO_CHANNEL(sioc);
+ if (qio_channel_socket_connect_sync(sioc, addr, errp)) {
+ object_unref(OBJECT(ioc));
+ return NULL;
+ }
+ qio_channel_set_blocking(ioc, false, NULL);
+
+ proxy =3D g_malloc0(sizeof(VFIOUserProxy));
+ proxy->sockname =3D g_strdup_printf("unix:%s", sockname);
+ proxy->ioc =3D ioc;
+ proxy->flags =3D VFIO_PROXY_CLIENT;
+ proxy->state =3D VFIO_PROXY_CONNECTED;
+
+ qemu_mutex_init(&proxy->lock);
+ qemu_cond_init(&proxy->close_cv);
+
+ if (vfio_user_iothread =3D=3D NULL) {
+ vfio_user_iothread =3D iothread_create("VFIO user", errp);
+ }
+
+ proxy->ctx =3D iothread_get_aio_context(vfio_user_iothread);
+
+ QTAILQ_INIT(&proxy->outgoing);
+ QTAILQ_INIT(&proxy->incoming);
+ QTAILQ_INIT(&proxy->free);
+ QTAILQ_INIT(&proxy->pending);
+ QLIST_INSERT_HEAD(&vfio_user_sockets, proxy, next);
+
+ return proxy;
+}
+
+void vfio_user_disconnect(VFIOUserProxy *proxy)
+{
+ VFIOUserMsg *r1, *r2;
+
+ qemu_mutex_lock(&proxy->lock);
+
+ /* our side is quitting */
+ if (proxy->state =3D=3D VFIO_PROXY_CONNECTED) {
+ vfio_user_shutdown(proxy);
+ if (!QTAILQ_EMPTY(&proxy->pending)) {
+ error_printf("vfio_user_disconnect: outstanding requests\n");
+ }
+ }
+ object_unref(OBJECT(proxy->ioc));
+ proxy->ioc =3D NULL;
+
+ proxy->state =3D VFIO_PROXY_CLOSING;
+ QTAILQ_FOREACH_SAFE(r1, &proxy->outgoing, next, r2) {
+ qemu_cond_destroy(&r1->cv);
+ QTAILQ_REMOVE(&proxy->outgoing, r1, next);
+ g_free(r1);
+ }
+ QTAILQ_FOREACH_SAFE(r1, &proxy->incoming, next, r2) {
+ qemu_cond_destroy(&r1->cv);
+ QTAILQ_REMOVE(&proxy->incoming, r1, next);
+ g_free(r1);
+ }
+ QTAILQ_FOREACH_SAFE(r1, &proxy->pending, next, r2) {
+ qemu_cond_destroy(&r1->cv);
+ QTAILQ_REMOVE(&proxy->pending, r1, next);
+ g_free(r1);
+ }
+ QTAILQ_FOREACH_SAFE(r1, &proxy->free, next, r2) {
+ qemu_cond_destroy(&r1->cv);
+ QTAILQ_REMOVE(&proxy->free, r1, next);
+ g_free(r1);
+ }
+
+ /*
+ * Make sure the iothread isn't blocking anywhere
+ * with a ref to this proxy by waiting for a BH
+ * handler to run after the proxy fd handlers were
+ * deleted above.
+ */
+ aio_bh_schedule_oneshot(proxy->ctx, vfio_user_cb, proxy);
+ qemu_cond_wait(&proxy->close_cv, &proxy->lock);
+
+ /* we now hold the only ref to proxy */
+ qemu_mutex_unlock(&proxy->lock);
+ qemu_cond_destroy(&proxy->close_cv);
+ qemu_mutex_destroy(&proxy->lock);
+
+ QLIST_REMOVE(proxy, next);
+ if (QLIST_EMPTY(&vfio_user_sockets)) {
+ iothread_destroy(vfio_user_iothread);
+ vfio_user_iothread =3D NULL;
+ }
+
+ g_free(proxy->sockname);
+ g_free(proxy);
+}
diff --git a/hw/vfio-user/common.h b/hw/vfio-user/common.h
new file mode 100644
index 0000000000..3529f03df9
--- /dev/null
+++ b/hw/vfio-user/common.h
@@ -0,0 +1,78 @@
+#ifndef VFIO_USER_COMMON_H
+#define VFIO_USER_COMMON_H
+
+/*
+ * vfio protocol over a UNIX socket.
+ *
+ * Copyright =C2=A9 2018, 2021 Oracle and/or its affiliates.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+typedef struct {
+ int send_fds;
+ int recv_fds;
+ int *fds;
+} VFIOUserFDs;
+
+enum msg_type {
+ VFIO_MSG_NONE,
+ VFIO_MSG_ASYNC,
+ VFIO_MSG_WAIT,
+ VFIO_MSG_NOWAIT,
+ VFIO_MSG_REQ,
+};
+
+typedef struct VFIOUserMsg {
+ QTAILQ_ENTRY(VFIOUserMsg) next;
+ VFIOUserFDs *fds;
+ uint32_t rsize;
+ uint32_t id;
+ QemuCond cv;
+ bool complete;
+ enum msg_type type;
+} VFIOUserMsg;
+
+
+enum proxy_state {
+ VFIO_PROXY_CONNECTED =3D 1,
+ VFIO_PROXY_ERROR =3D 2,
+ VFIO_PROXY_CLOSING =3D 3,
+ VFIO_PROXY_CLOSED =3D 4,
+};
+
+typedef QTAILQ_HEAD(VFIOUserMsgQ, VFIOUserMsg) VFIOUserMsgQ;
+
+typedef struct VFIOUserProxy {
+ QLIST_ENTRY(VFIOUserProxy) next;
+ char *sockname;
+ struct QIOChannel *ioc;
+ void (*request)(void *opaque, VFIOUserMsg *msg);
+ void *req_arg;
+ int flags;
+ QemuCond close_cv;
+ AioContext *ctx;
+ QEMUBH *req_bh;
+
+ /*
+ * above only changed when BQL is held
+ * below are protected by per-proxy lock
+ */
+ QemuMutex lock;
+ VFIOUserMsgQ free;
+ VFIOUserMsgQ pending;
+ VFIOUserMsgQ incoming;
+ VFIOUserMsgQ outgoing;
+ VFIOUserMsg *last_nowait;
+ enum proxy_state state;
+} VFIOUserProxy;
+
+/* VFIOProxy flags */
+#define VFIO_PROXY_CLIENT 0x1
+
+VFIOUserProxy *vfio_user_connect_dev(SocketAddress *addr, Error **errp);
+void vfio_user_disconnect(VFIOUserProxy *proxy);
+
+#endif /* VFIO_USER_COMMON_H */
diff --git a/hw/vfio-user/meson.build b/hw/vfio-user/meson.build
index f1fee70c85..b89985c641 100644
--- a/hw/vfio-user/meson.build
+++ b/hw/vfio-user/meson.build
@@ -1,5 +1,6 @@
vfio_user_ss =3D ss.source_set()
vfio_user_ss.add(files(
+ 'common.c',
'container.c',
'pci.c',
))
diff --git a/hw/vfio-user/pci.c b/hw/vfio-user/pci.c
index 6c85c60179..bfd9051524 100644
--- a/hw/vfio-user/pci.c
+++ b/hw/vfio-user/pci.c
@@ -19,6 +19,8 @@
#include "hw/qdev-properties.h"
#include "hw/qdev-properties-system.h"
#include "hw/vfio/pci.h"
+#include "hw/vfio-user/common.h"
+#include "hw/vfio-user/container.h"
#include "qapi/error.h"
#include "qobject/qdict.h"
#include "qemu/error-report.h"
@@ -59,6 +61,8 @@ static void vfio_user_pci_realize(PCIDevice *pdev, Error =
**errp)
VFIOPCIDevice *vdev =3D VFIO_PCI_BASE(pdev);
VFIODevice *vbasedev =3D &vdev->vbasedev;
AddressSpace *as;
+ SocketAddress addr;
+ VFIOUserProxy *proxy;
=20
/*
* TODO: make option parser understand SocketAddress
@@ -71,6 +75,15 @@ static void vfio_user_pci_realize(PCIDevice *pdev, Error=
**errp)
return;
}
=20
+ memset(&addr, 0, sizeof(addr));
+ addr.type =3D SOCKET_ADDRESS_TYPE_UNIX;
+ addr.u.q_unix.path =3D udev->sock_name;
+ proxy =3D vfio_user_connect_dev(&addr, errp);
+ if (!proxy) {
+ return;
+ }
+ vbasedev->proxy =3D proxy;
+
vbasedev->name =3D g_strdup_printf("VFIO user <%s>", udev->sock_name);
vbasedev->ops =3D &vfio_user_pci_ops;
vbasedev->type =3D VFIO_DEVICE_TYPE_PCI;
@@ -119,8 +132,13 @@ static void vfio_user_instance_init(Object *obj)
static void vfio_user_instance_finalize(Object *obj)
{
VFIOPCIDevice *vdev =3D VFIO_PCI_BASE(obj);
+ VFIODevice *vbasedev =3D &vdev->vbasedev;
=20
vfio_pci_put_device(vdev);
+
+ if (vbasedev->proxy !=3D NULL) {
+ vfio_user_disconnect(vbasedev->proxy);
+ }
}
=20
static const Property vfio_user_pci_dev_properties[] =3D {
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index ee8e7f7c0d..699e8a9376 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -79,6 +79,7 @@ typedef struct VFIOMigration {
} VFIOMigration;
=20
struct VFIOGroup;
+typedef struct VFIOUserProxy VFIOUserProxy;
=20
/* MMU container sub-class for legacy vfio implementation. */
typedef struct VFIOContainer {
@@ -155,6 +156,7 @@ typedef struct VFIODevice {
IOMMUFDBackend *iommufd;
VFIOIOASHwpt *hwpt;
QLIST_ENTRY(VFIODevice) hwpt_next;
+ VFIOUserProxy *proxy;
struct vfio_region_info **regions;
} VFIODevice;
=20
--=20
2.34.1