Add a vhost-user input backend example, based on virtio-input-host
device. It takes an evdev path as argument, and can be associated with a
vhost-user-backend object, ex:
-object vhost-user-backend,id=vuid,cmd="vhost-user-input /dev/input/event0"
Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com>
---
contrib/libvhost-user/libvhost-user.h | 1 +
contrib/vhost-user-input/main.c | 358 +++++++++++++++++++++++++
Makefile | 3 +
Makefile.objs | 1 +
configure | 1 +
contrib/vhost-user-input/Makefile.objs | 1 +
6 files changed, 365 insertions(+)
create mode 100644 contrib/vhost-user-input/main.c
create mode 100644 contrib/vhost-user-input/Makefile.objs
diff --git a/contrib/libvhost-user/libvhost-user.h
b/contrib/libvhost-user/libvhost-user.h
index b27075ea3b..d6badc8653 100644
--- a/contrib/libvhost-user/libvhost-user.h
+++ b/contrib/libvhost-user/libvhost-user.h
@@ -89,6 +89,7 @@ typedef enum VhostUserRequest {
VHOST_USER_POSTCOPY_ADVISE = 28,
VHOST_USER_POSTCOPY_LISTEN = 29,
VHOST_USER_POSTCOPY_END = 30,
+ VHOST_USER_INPUT_GET_CONFIG,
VHOST_USER_MAX
} VhostUserRequest;
diff --git a/contrib/vhost-user-input/main.c b/contrib/vhost-user-input/main.c
new file mode 100644
index 0000000000..b2c2184446
--- /dev/null
+++ b/contrib/vhost-user-input/main.c
@@ -0,0 +1,358 @@
+#include <glib.h>
+#include <linux/input.h>
+
+#include "qemu/osdep.h"
+#include "qemu/iov.h"
+#include "qemu/bswap.h"
+#include "contrib/libvhost-user/libvhost-user.h"
+#include "contrib/libvhost-user/libvhost-user-glib.h"
+#include "standard-headers/linux/virtio_input.h"
+
+typedef struct virtio_input_event virtio_input_event;
+typedef struct virtio_input_config virtio_input_config;
+
+typedef struct VuInput {
+ VugDev dev;
+ GSource *evsrc;
+ int evdevfd;
+ GArray *config;
+ virtio_input_event *queue;
+ uint32_t qindex, qsize;
+} VuInput;
+
+static void vi_input_send(VuInput *vi, struct virtio_input_event *event)
+{
+ VuDev *dev = &vi->dev.parent;
+ VuVirtq *vq = vu_get_queue(dev, 0);
+ VuVirtqElement *elem;
+ unsigned have, need;
+ int i, len;
+
+ /* queue up events ... */
+ if (vi->qindex == vi->qsize) {
+ vi->qsize++;
+ vi->queue = realloc(vi->queue, vi->qsize *
+ sizeof(virtio_input_event));
+ }
+ vi->queue[vi->qindex++] = *event;
+
+ /* ... until we see a report sync ... */
+ if (event->type != htole16(EV_SYN) ||
+ event->code != htole16(SYN_REPORT)) {
+ return;
+ }
+
+ /* ... then check available space ... */
+ need = sizeof(virtio_input_event) * vi->qindex;
+ vu_queue_get_avail_bytes(dev, vq, &have, NULL, need, 0);
+ if (have < need) {
+ vi->qindex = 0;
+ g_warning("ENOSPC in vq, dropping events");
+ return;
+ }
+
+ /* ... and finally pass them to the guest */
+ for (i = 0; i < vi->qindex; i++) {
+ elem = vu_queue_pop(dev, vq, sizeof(VuVirtqElement));
+ if (!elem) {
+ /* should not happen, we've checked for space beforehand */
+ g_warning("%s: Huh? No vq elem available ...\n", __func__);
+ return;
+ }
+ len = iov_from_buf(elem->in_sg, elem->in_num,
+ 0, vi->queue + i, sizeof(virtio_input_event));
+ vu_queue_push(dev, vq, elem, len);
+ g_free(elem);
+ }
+ vu_queue_notify(&vi->dev.parent, vq);
+ vi->qindex = 0;
+}
+
+static void
+vi_evdev_watch(VuDev *dev, int condition, void *data)
+{
+ VuInput *vi = data;
+ int fd = vi->evdevfd;
+
+ g_debug("Got evdev condition %x", condition);
+
+ struct virtio_input_event virtio;
+ struct input_event evdev;
+ int rc;
+
+ for (;;) {
+ rc = read(fd, &evdev, sizeof(evdev));
+ if (rc != sizeof(evdev)) {
+ break;
+ }
+
+ g_debug("input %d %d %d", evdev.type, evdev.code, evdev.value);
+
+ virtio.type = htole16(evdev.type);
+ virtio.code = htole16(evdev.code);
+ virtio.value = htole32(evdev.value);
+ vi_input_send(vi, &virtio);
+ }
+}
+
+
+static void vi_handle_status(VuInput *vi, virtio_input_event *event)
+{
+ struct input_event evdev;
+ int rc;
+
+ if (gettimeofday(&evdev.time, NULL)) {
+ perror("vi_handle_status: gettimeofday");
+ return;
+ }
+
+ evdev.type = le16toh(event->type);
+ evdev.code = le16toh(event->code);
+ evdev.value = le32toh(event->value);
+
+ rc = write(vi->evdevfd, &evdev, sizeof(evdev));
+ if (rc == -1) {
+ perror("vi_host_handle_status: write");
+ }
+}
+
+static void vi_handle_sts(VuDev *dev, int qidx)
+{
+ VuInput *vi = container_of(dev, VuInput, dev.parent);
+ VuVirtq *vq = vu_get_queue(dev, qidx);
+ virtio_input_event event;
+ VuVirtqElement *elem;
+ int len;
+
+ g_debug("%s", __func__);
+
+ for (;;) {
+ elem = vu_queue_pop(dev, vq, sizeof(VuVirtqElement));
+ if (!elem) {
+ break;
+ }
+
+ memset(&event, 0, sizeof(event));
+ len = iov_to_buf(elem->out_sg, elem->out_num,
+ 0, &event, sizeof(event));
+ vi_handle_status(vi, &event);
+ vu_queue_push(dev, vq, elem, len);
+ g_free(elem);
+ }
+
+ vu_queue_notify(&vi->dev.parent, vq);
+}
+
+static void
+vi_panic(VuDev *dev, const char *msg)
+{
+ g_critical("%s\n", msg);
+ exit(1);
+}
+
+static void
+vi_queue_set_started(VuDev *dev, int qidx, bool started)
+{
+ VuInput *vi = container_of(dev, VuInput, dev.parent);
+ VuVirtq *vq = vu_get_queue(dev, qidx);
+
+ g_debug("queue started %d:%d", qidx, started);
+
+ if (qidx == 0) {
+ if (started && !vi->evsrc) {
+ vi->evsrc = vug_source_new(&vi->dev, vi->evdevfd,
+ G_IO_IN, vi_evdev_watch, vi);
+ } else if (!started) {
+ g_source_destroy(vi->evsrc);
+ vi->evsrc = NULL;
+ }
+ } else {
+ vu_set_queue_handler(dev, vq, started ? vi_handle_sts : NULL);
+ }
+}
+
+static int
+vi_process_msg(VuDev *dev, VhostUserMsg *vmsg, int *do_reply)
+{
+ VuInput *vi = container_of(dev, VuInput, dev.parent);
+
+ switch (vmsg->request) {
+ case VHOST_USER_INPUT_GET_CONFIG:
+ vmsg->size = vi->config->len * sizeof(virtio_input_config);
+ vmsg->data = g_memdup(vi->config->data, vmsg->size);
+ *do_reply = true;
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+static const VuDevIface vuiface = {
+ .queue_set_started = vi_queue_set_started,
+ .process_msg = vi_process_msg,
+};
+
+static void
+vi_bits_config(VuInput *vi, int type, int count)
+{
+ virtio_input_config bits;
+ int rc, i, size = 0;
+
+ memset(&bits, 0, sizeof(bits));
+ rc = ioctl(vi->evdevfd, EVIOCGBIT(type, count / 8), bits.u.bitmap);
+ if (rc < 0) {
+ return;
+ }
+
+ for (i = 0; i < count / 8; i++) {
+ if (bits.u.bitmap[i]) {
+ size = i + 1;
+ }
+ }
+ if (size == 0) {
+ return;
+ }
+
+ bits.select = VIRTIO_INPUT_CFG_EV_BITS;
+ bits.subsel = type;
+ bits.size = size;
+ g_array_append_val(vi->config, bits);
+}
+
+static int unix_sock_new(char *path)
+{
+ int sock;
+ struct sockaddr_un un;
+ size_t len;
+
+ sock = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (sock <= 0) {
+ perror("socket");
+ return -1;
+ }
+
+ un.sun_family = AF_UNIX;
+ snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
+ len = sizeof(un.sun_family) + strlen(un.sun_path);
+
+ unlink(path);
+ if (bind(sock, (struct sockaddr *)&un, len) < 0) {
+ perror("bind");
+ goto fail;
+ }
+
+ if (listen(sock, 1) < 0) {
+ perror("listen");
+ goto fail;
+ }
+
+ return sock;
+
+fail:
+ close(sock);
+
+ return -1;
+}
+
+char **fname;
+char *socket_path;
+bool nograb;
+
+static GOptionEntry entries[] = {
+ { "no-grab", 'n', 0, G_OPTION_ARG_NONE, &nograb,
+ "Don't grab device", "" },
+ { "socket-path", 's', 0, G_OPTION_ARG_FILENAME, &socket_path,
+ "Use UNIX socket path", "" },
+ { G_OPTION_REMAINING, '\0', 0, G_OPTION_ARG_FILENAME_ARRAY, &fname,
+ "EVDEV filename", "" },
+ { NULL, }
+};
+
+int
+main(int argc, char *argv[])
+{
+ GMainLoop *loop = NULL;
+ VuInput vi = { 0, };
+ int rc, ver, fd;
+ virtio_input_config id;
+ struct input_id ids;
+ GError *error = NULL;
+ GOptionContext *context;
+
+ context = g_option_context_new("EVDEV - vhost-user-input sample");
+ g_option_context_add_main_entries(context, entries, NULL);
+ if (!g_option_context_parse(context, &argc, &argv, &error)) {
+ g_printerr("Option parsing failed: %s\n", error->message);
+ exit(1);
+ }
+ if (!fname || !fname[0] || fname[1]) {
+ g_printerr("Please specify a single EVDEV filename\n");
+ exit(1);
+ }
+
+ vi.evdevfd = open(fname[0], O_RDWR);
+ if (vi.evdevfd < 0) {
+ g_printerr("Failed to open evdev: %s\n", g_strerror(errno));
+ exit(1);
+ }
+
+ rc = ioctl(vi.evdevfd, EVIOCGVERSION, &ver);
+ if (rc < 0) {
+ g_printerr("%s: is not an evdev device\n", argv[1]);
+ exit(1);
+ }
+
+ if (!nograb) {
+ rc = ioctl(vi.evdevfd, EVIOCGRAB, 1);
+ if (rc < 0) {
+ g_printerr("Failed to grab device\n");
+ exit(1);
+ }
+ }
+
+ vi.config = g_array_new(false, false, sizeof(virtio_input_config));
+ memset(&id, 0, sizeof(id));
+ ioctl(vi.evdevfd, EVIOCGNAME(sizeof(id.u.string) - 1), id.u.string);
+ id.select = VIRTIO_INPUT_CFG_ID_NAME;
+ id.size = strlen(id.u.string);
+ g_array_append_val(vi.config, id);
+
+ if (ioctl(vi.evdevfd, EVIOCGID, &ids) == 0) {
+ memset(&id, 0, sizeof(id));
+ id.select = VIRTIO_INPUT_CFG_ID_DEVIDS;
+ id.size = sizeof(struct virtio_input_devids);
+ id.u.ids.bustype = cpu_to_le16(ids.bustype);
+ id.u.ids.vendor = cpu_to_le16(ids.vendor);
+ id.u.ids.product = cpu_to_le16(ids.product);
+ id.u.ids.version = cpu_to_le16(ids.version);
+ g_array_append_val(vi.config, id);
+ }
+
+ vi_bits_config(&vi, EV_KEY, KEY_CNT);
+ vi_bits_config(&vi, EV_REL, REL_CNT);
+ vi_bits_config(&vi, EV_ABS, ABS_CNT);
+ vi_bits_config(&vi, EV_MSC, MSC_CNT);
+ vi_bits_config(&vi, EV_SW, SW_CNT);
+ g_debug("config length: %u", vi.config->len);
+
+ if (socket_path) {
+ int lsock = unix_sock_new(socket_path);
+ fd = accept(lsock, NULL, NULL);
+ close(lsock);
+ } else {
+ fd = 3;
+ }
+ if (fd == -1) {
+ g_printerr("Invalid socket");
+ exit(1);
+ }
+ vug_init(&vi.dev, fd, vi_panic, &vuiface);
+
+ loop = g_main_loop_new(NULL, FALSE);
+ g_main_loop_run(loop);
+ g_main_loop_unref(loop);
+
+ vug_deinit(&vi.dev);
+
+ return 0;
+}
diff --git a/Makefile b/Makefile
index 6d588d1f71..d1222da359 100644
--- a/Makefile
+++ b/Makefile
@@ -420,6 +420,7 @@ dummy := $(call unnest-vars,, \
libvhost-user-obj-y \
vhost-user-scsi-obj-y \
vhost-user-blk-obj-y \
+ vhost-user-input-obj-y \
qga-vss-dll-obj-y \
block-obj-y \
block-obj-m \
@@ -719,6 +720,8 @@ vhost-user-scsi$(EXESUF): $(vhost-user-scsi-obj-y)
libvhost-user.a
$(call LINK, $^)
vhost-user-blk$(EXESUF): $(vhost-user-blk-obj-y) libvhost-user.a
$(call LINK, $^)
+vhost-user-input$(EXESUF): $(vhost-user-input-obj-y) libvhost-user.a
libqemuutil.a
+ $(call LINK, $^)
module_block.h: $(SRC_PATH)/scripts/modules/module_block.py config-host.mak
$(call quiet-command,$(PYTHON) $< $@ \
diff --git a/Makefile.objs b/Makefile.objs
index c6c3554203..c20f8d35d7 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -193,6 +193,7 @@ vhost-user-scsi.o-cflags := $(LIBISCSI_CFLAGS)
vhost-user-scsi.o-libs := $(LIBISCSI_LIBS)
vhost-user-scsi-obj-y = contrib/vhost-user-scsi/
vhost-user-blk-obj-y = contrib/vhost-user-blk/
+vhost-user-input-obj-y = contrib/vhost-user-input/
######################################################################
trace-events-subdirs =
diff --git a/configure b/configure
index a6a4616c3e..1d1caea9e7 100755
--- a/configure
+++ b/configure
@@ -5532,6 +5532,7 @@ if test "$want_tools" = "yes" ; then
fi
if [ "$ivshmem" = "yes" ]; then
tools="ivshmem-client\$(EXESUF) ivshmem-server\$(EXESUF) $tools"
+ tools="vhost-user-input\$(EXESUF) $tools"
fi
fi
if test "$softmmu" = yes ; then
diff --git a/contrib/vhost-user-input/Makefile.objs
b/contrib/vhost-user-input/Makefile.objs
new file mode 100644
index 0000000000..b1fad90d51
--- /dev/null
+++ b/contrib/vhost-user-input/Makefile.objs
@@ -0,0 +1 @@
+vhost-user-input-obj-y = main.o
--
2.17.1.906.g10fd178552
