* [Qemu-devel] [PATCH v2 3/6] Add vhost-user-backend
2019-05-03 13:00 [Qemu-devel] [PATCH v2 0/6] Add vhost-user-input Marc-André Lureau
2019-05-03 13:00 ` [Qemu-devel] [PATCH v2 1/6] libvhost-user: fix -Waddress-of-packed-member Marc-André Lureau
2019-05-03 13:00 ` [Qemu-devel] [PATCH v2 2/6] libvhost-user: add PROTOCOL_F_CONFIG if {set, get}_config Marc-André Lureau
@ 2019-05-03 13:00 ` Marc-André Lureau
2019-05-03 13:00 ` [Qemu-devel] [PATCH v2 4/6] Add vhost-user-input-pci Marc-André Lureau
` (3 subsequent siblings)
6 siblings, 0 replies; 16+ messages in thread
From: Marc-André Lureau @ 2019-05-03 13:00 UTC (permalink / raw)
To: qemu-devel; +Cc: kraxel, mst
Create a vhost-user-backend object that holds a connection to a
vhost-user backend (or "slave" process) and can be referenced from
virtio devices that support it. See later patches for input & gpu
usage.
Note: a previous iteration of this object made it user-creatable, and
allowed managed sub-process spawning, but that has been dropped for
now.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
include/sysemu/vhost-user-backend.h | 57 ++++++++
backends/vhost-user.c | 209 ++++++++++++++++++++++++++++
MAINTAINERS | 2 +
backends/Makefile.objs | 2 +
4 files changed, 270 insertions(+)
create mode 100644 include/sysemu/vhost-user-backend.h
create mode 100644 backends/vhost-user.c
diff --git a/include/sysemu/vhost-user-backend.h b/include/sysemu/vhost-user-backend.h
new file mode 100644
index 0000000000..9abf8f06a1
--- /dev/null
+++ b/include/sysemu/vhost-user-backend.h
@@ -0,0 +1,57 @@
+/*
+ * QEMU vhost-user backend
+ *
+ * Copyright (C) 2018 Red Hat Inc
+ *
+ * Authors:
+ * Marc-André Lureau <marcandre.lureau@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+#ifndef QEMU_VHOST_USER_BACKEND_H
+#define QEMU_VHOST_USER_BACKEND_H
+
+#include "qom/object.h"
+#include "exec/memory.h"
+#include "qemu/option.h"
+#include "qemu/bitmap.h"
+#include "hw/virtio/vhost.h"
+#include "hw/virtio/vhost-user.h"
+#include "chardev/char-fe.h"
+#include "io/channel.h"
+
+#define TYPE_VHOST_USER_BACKEND "vhost-user-backend"
+#define VHOST_USER_BACKEND(obj) \
+ OBJECT_CHECK(VhostUserBackend, (obj), TYPE_VHOST_USER_BACKEND)
+#define VHOST_USER_BACKEND_GET_CLASS(obj) \
+ OBJECT_GET_CLASS(VhostUserBackendClass, (obj), TYPE_VHOST_USER_BACKEND)
+#define VHOST_USER_BACKEND_CLASS(klass) \
+ OBJECT_CLASS_CHECK(VhostUserBackendClass, (klass), TYPE_VHOST_USER_BACKEND)
+
+typedef struct VhostUserBackend VhostUserBackend;
+typedef struct VhostUserBackendClass VhostUserBackendClass;
+
+struct VhostUserBackendClass {
+ ObjectClass parent_class;
+};
+
+struct VhostUserBackend {
+ /* private */
+ Object parent;
+
+ char *chr_name;
+ CharBackend chr;
+ VhostUserState vhost_user;
+ struct vhost_dev dev;
+ VirtIODevice *vdev;
+ bool started;
+ bool completed;
+};
+
+int vhost_user_backend_dev_init(VhostUserBackend *b, VirtIODevice *vdev,
+ unsigned nvqs, Error **errp);
+void vhost_user_backend_start(VhostUserBackend *b);
+void vhost_user_backend_stop(VhostUserBackend *b);
+
+#endif
diff --git a/backends/vhost-user.c b/backends/vhost-user.c
new file mode 100644
index 0000000000..2b055544a7
--- /dev/null
+++ b/backends/vhost-user.c
@@ -0,0 +1,209 @@
+/*
+ * QEMU vhost-user backend
+ *
+ * Copyright (C) 2018 Red Hat Inc
+ *
+ * Authors:
+ * Marc-André Lureau <marcandre.lureau@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+
+#include "qemu/osdep.h"
+#include "hw/qdev.h"
+#include "qapi/error.h"
+#include "qapi/qmp/qerror.h"
+#include "qemu/error-report.h"
+#include "qom/object_interfaces.h"
+#include "sysemu/vhost-user-backend.h"
+#include "sysemu/kvm.h"
+#include "io/channel-command.h"
+#include "hw/virtio/virtio-bus.h"
+
+static bool
+ioeventfd_enabled(void)
+{
+ return kvm_enabled() && kvm_eventfds_enabled();
+}
+
+int
+vhost_user_backend_dev_init(VhostUserBackend *b, VirtIODevice *vdev,
+ unsigned nvqs, Error **errp)
+{
+ int ret;
+
+ assert(!b->vdev && vdev);
+
+ if (!ioeventfd_enabled()) {
+ error_setg(errp, "vhost initialization failed: requires kvm");
+ return -1;
+ }
+
+ if (!vhost_user_init(&b->vhost_user, &b->chr, errp)) {
+ return -1;
+ }
+
+ b->vdev = vdev;
+ b->dev.nvqs = nvqs;
+ b->dev.vqs = g_new(struct vhost_virtqueue, nvqs);
+
+ ret = vhost_dev_init(&b->dev, &b->vhost_user, VHOST_BACKEND_TYPE_USER, 0);
+ if (ret < 0) {
+ error_setg_errno(errp, -ret, "vhost initialization failed");
+ return -1;
+ }
+
+ return 0;
+}
+
+void
+vhost_user_backend_start(VhostUserBackend *b)
+{
+ BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(b->vdev)));
+ VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
+ int ret, i ;
+
+ if (b->started) {
+ return;
+ }
+
+ if (!k->set_guest_notifiers) {
+ error_report("binding does not support guest notifiers");
+ return;
+ }
+
+ ret = vhost_dev_enable_notifiers(&b->dev, b->vdev);
+ if (ret < 0) {
+ return;
+ }
+
+ ret = k->set_guest_notifiers(qbus->parent, b->dev.nvqs, true);
+ if (ret < 0) {
+ error_report("Error binding guest notifier");
+ goto err_host_notifiers;
+ }
+
+ b->dev.acked_features = b->vdev->guest_features;
+ ret = vhost_dev_start(&b->dev, b->vdev);
+ if (ret < 0) {
+ error_report("Error start vhost dev");
+ goto err_guest_notifiers;
+ }
+
+ /* guest_notifier_mask/pending not used yet, so just unmask
+ * everything here. virtio-pci will do the right thing by
+ * enabling/disabling irqfd.
+ */
+ for (i = 0; i < b->dev.nvqs; i++) {
+ vhost_virtqueue_mask(&b->dev, b->vdev,
+ b->dev.vq_index + i, false);
+ }
+
+ b->started = true;
+ return;
+
+err_guest_notifiers:
+ k->set_guest_notifiers(qbus->parent, b->dev.nvqs, false);
+err_host_notifiers:
+ vhost_dev_disable_notifiers(&b->dev, b->vdev);
+}
+
+void
+vhost_user_backend_stop(VhostUserBackend *b)
+{
+ BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(b->vdev)));
+ VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
+ int ret = 0;
+
+ if (!b->started) {
+ return;
+ }
+
+ vhost_dev_stop(&b->dev, b->vdev);
+
+ if (k->set_guest_notifiers) {
+ ret = k->set_guest_notifiers(qbus->parent,
+ b->dev.nvqs, false);
+ if (ret < 0) {
+ error_report("vhost guest notifier cleanup failed: %d", ret);
+ }
+ }
+ assert(ret >= 0);
+
+ vhost_dev_disable_notifiers(&b->dev, b->vdev);
+ b->started = false;
+}
+
+static void set_chardev(Object *obj, const char *value, Error **errp)
+{
+ VhostUserBackend *b = VHOST_USER_BACKEND(obj);
+ Chardev *chr;
+
+ if (b->completed) {
+ error_setg(errp, QERR_PERMISSION_DENIED);
+ return;
+ }
+
+ g_free(b->chr_name);
+ b->chr_name = g_strdup(value);
+
+ chr = qemu_chr_find(b->chr_name);
+ if (chr == NULL) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+ "Chardev '%s' not found", b->chr_name);
+ return;
+ }
+
+ if (!qemu_chr_fe_init(&b->chr, chr, errp)) {
+ return;
+ }
+
+ b->completed = true;
+ /* could call vhost_dev_init() so early message can be exchanged */
+}
+
+static char *get_chardev(Object *obj, Error **errp)
+{
+ VhostUserBackend *b = VHOST_USER_BACKEND(obj);
+ Chardev *chr = qemu_chr_fe_get_driver(&b->chr);
+
+ if (chr && chr->label) {
+ return g_strdup(chr->label);
+ }
+
+ return NULL;
+}
+
+static void vhost_user_backend_init(Object *obj)
+{
+ object_property_add_str(obj, "chardev", get_chardev, set_chardev, NULL);
+}
+
+static void vhost_user_backend_finalize(Object *obj)
+{
+ VhostUserBackend *b = VHOST_USER_BACKEND(obj);
+
+ g_free(b->dev.vqs);
+ g_free(b->chr_name);
+
+ vhost_user_cleanup(&b->vhost_user);
+ qemu_chr_fe_deinit(&b->chr, true);
+}
+
+static const TypeInfo vhost_user_backend_info = {
+ .name = TYPE_VHOST_USER_BACKEND,
+ .parent = TYPE_OBJECT,
+ .instance_size = sizeof(VhostUserBackend),
+ .instance_init = vhost_user_backend_init,
+ .instance_finalize = vhost_user_backend_finalize,
+ .class_size = sizeof(VhostUserBackendClass),
+};
+
+static void register_types(void)
+{
+ type_register_static(&vhost_user_backend_info);
+}
+
+type_init(register_types);
diff --git a/MAINTAINERS b/MAINTAINERS
index 66ddbda9c9..2e40390ebc 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1478,6 +1478,8 @@ F: hw/*/*vhost*
F: docs/interop/vhost-user.json
F: docs/interop/vhost-user.txt
F: contrib/vhost-user-*/
+F: backends/vhost-user.c
+F: include/sysemu/vhost-user-backend.h
virtio
M: Michael S. Tsirkin <mst@redhat.com>
diff --git a/backends/Makefile.objs b/backends/Makefile.objs
index ff619d31b4..981e8e122f 100644
--- a/backends/Makefile.objs
+++ b/backends/Makefile.objs
@@ -14,4 +14,6 @@ common-obj-y += cryptodev-vhost.o
common-obj-$(CONFIG_VHOST_CRYPTO) += cryptodev-vhost-user.o
endif
+common-obj-$(call land,$(CONFIG_VHOST_USER),$(CONFIG_VIRTIO)) += vhost-user.o
+
common-obj-$(CONFIG_LINUX) += hostmem-memfd.o
--
2.21.0.777.g83232e3864
^ permalink raw reply related [flat|nested] 16+ messages in thread* [Qemu-devel] [PATCH v2 4/6] Add vhost-user-input-pci
2019-05-03 13:00 [Qemu-devel] [PATCH v2 0/6] Add vhost-user-input Marc-André Lureau
` (2 preceding siblings ...)
2019-05-03 13:00 ` [Qemu-devel] [PATCH v2 3/6] Add vhost-user-backend Marc-André Lureau
@ 2019-05-03 13:00 ` Marc-André Lureau
2019-05-09 6:32 ` Gerd Hoffmann
2019-05-03 13:00 ` [Qemu-devel] [PATCH v2 5/6] util: simplify unix_listen() Marc-André Lureau
` (2 subsequent siblings)
6 siblings, 1 reply; 16+ messages in thread
From: Marc-André Lureau @ 2019-05-03 13:00 UTC (permalink / raw)
To: qemu-devel; +Cc: kraxel, mst
Add a new virtio-input device, which connects to a vhost-user
backend.
Instead of reading configuration directly from an input device /
evdev (like virtio-input-host), it reads it over vhost-user protocol
with {SET,GET}_CONFIG messages. The vhost-user-backend handles the
queues & events setup.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
include/hw/virtio/virtio-input.h | 14 ++++
hw/input/vhost-user-input.c | 129 +++++++++++++++++++++++++++++++
hw/virtio/vhost-user-input-pci.c | 53 +++++++++++++
MAINTAINERS | 1 +
hw/input/Kconfig | 5 ++
hw/input/Makefile.objs | 1 +
hw/virtio/Makefile.objs | 1 +
7 files changed, 204 insertions(+)
create mode 100644 hw/input/vhost-user-input.c
create mode 100644 hw/virtio/vhost-user-input-pci.c
diff --git a/include/hw/virtio/virtio-input.h b/include/hw/virtio/virtio-input.h
index 054c38836f..4fca03e796 100644
--- a/include/hw/virtio/virtio-input.h
+++ b/include/hw/virtio/virtio-input.h
@@ -2,6 +2,7 @@
#define QEMU_VIRTIO_INPUT_H
#include "ui/input.h"
+#include "sysemu/vhost-user-backend.h"
/* ----------------------------------------------------------------- */
/* virtio input protocol */
@@ -42,11 +43,18 @@ typedef struct virtio_input_event virtio_input_event;
#define VIRTIO_INPUT_HOST_GET_PARENT_CLASS(obj) \
OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_INPUT_HOST)
+#define TYPE_VHOST_USER_INPUT "vhost-user-input"
+#define VHOST_USER_INPUT(obj) \
+ OBJECT_CHECK(VHostUserInput, (obj), TYPE_VHOST_USER_INPUT)
+#define VHOST_USER_INPUT_GET_PARENT_CLASS(obj) \
+ OBJECT_GET_PARENT_CLASS(obj, TYPE_VHOST_USER_INPUT)
+
typedef struct VirtIOInput VirtIOInput;
typedef struct VirtIOInputClass VirtIOInputClass;
typedef struct VirtIOInputConfig VirtIOInputConfig;
typedef struct VirtIOInputHID VirtIOInputHID;
typedef struct VirtIOInputHost VirtIOInputHost;
+typedef struct VHostUserInput VHostUserInput;
struct VirtIOInputConfig {
virtio_input_config config;
@@ -98,6 +106,12 @@ struct VirtIOInputHost {
int fd;
};
+struct VHostUserInput {
+ VirtIOInput parent_obj;
+
+ VhostUserBackend *vhost;
+};
+
void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event);
void virtio_input_init_config(VirtIOInput *vinput,
virtio_input_config *config);
diff --git a/hw/input/vhost-user-input.c b/hw/input/vhost-user-input.c
new file mode 100644
index 0000000000..6da497b1a8
--- /dev/null
+++ b/hw/input/vhost-user-input.c
@@ -0,0 +1,129 @@
+/*
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * (at your option) any later version. See the COPYING file in the
+ * top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/error-report.h"
+#include "qapi/error.h"
+#include "qemu-common.h"
+
+#include "hw/qdev.h"
+#include "hw/virtio/virtio-input.h"
+
+static int vhost_input_config_change(struct vhost_dev *dev)
+{
+ error_report("vhost-user-input: unhandled backend config change");
+ return -1;
+}
+
+static const VhostDevConfigOps config_ops = {
+ .vhost_dev_config_notifier = vhost_input_config_change,
+};
+
+static void vhost_input_realize(DeviceState *dev, Error **errp)
+{
+ VHostUserInput *vhi = VHOST_USER_INPUT(dev);
+ VirtIOInput *vinput = VIRTIO_INPUT(dev);
+ VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+
+ vhost_dev_set_config_notifier(&vhi->vhost->dev, &config_ops);
+ vinput->cfg_size = sizeof_field(virtio_input_config, u);
+ if (vhost_user_backend_dev_init(vhi->vhost, vdev, 2, errp) == -1) {
+ return;
+ }
+}
+
+static void vhost_input_change_active(VirtIOInput *vinput)
+{
+ VHostUserInput *vhi = VHOST_USER_INPUT(vinput);
+
+ if (vinput->active) {
+ vhost_user_backend_start(vhi->vhost);
+ } else {
+ vhost_user_backend_stop(vhi->vhost);
+ }
+}
+
+static void vhost_input_get_config(VirtIODevice *vdev, uint8_t *config_data)
+{
+ VirtIOInput *vinput = VIRTIO_INPUT(vdev);
+ VHostUserInput *vhi = VHOST_USER_INPUT(vdev);
+ int ret;
+
+ memset(config_data, 0, vinput->cfg_size);
+
+ ret = vhost_dev_get_config(&vhi->vhost->dev, config_data, vinput->cfg_size);
+ if (ret) {
+ error_report("vhost-user-input: get device config space failed");
+ return;
+ }
+}
+
+static void vhost_input_set_config(VirtIODevice *vdev,
+ const uint8_t *config_data)
+{
+ VHostUserInput *vhi = VHOST_USER_INPUT(vdev);
+ int ret;
+
+ ret = vhost_dev_set_config(&vhi->vhost->dev, config_data,
+ 0, sizeof(virtio_input_config),
+ VHOST_SET_CONFIG_TYPE_MASTER);
+ if (ret) {
+ error_report("vhost-user-input: set device config space failed");
+ return;
+ }
+
+ virtio_notify_config(vdev);
+}
+
+static const VMStateDescription vmstate_vhost_input = {
+ .name = "vhost-user-input",
+ .unmigratable = 1,
+};
+
+static void vhost_input_class_init(ObjectClass *klass, void *data)
+{
+ VirtIOInputClass *vic = VIRTIO_INPUT_CLASS(klass);
+ VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->vmsd = &vmstate_vhost_input;
+ vdc->get_config = vhost_input_get_config;
+ vdc->set_config = vhost_input_set_config;
+ vic->realize = vhost_input_realize;
+ vic->change_active = vhost_input_change_active;
+}
+
+static void vhost_input_init(Object *obj)
+{
+ VHostUserInput *vhi = VHOST_USER_INPUT(obj);
+
+ vhi->vhost = VHOST_USER_BACKEND(object_new(TYPE_VHOST_USER_BACKEND));
+ object_property_add_alias(obj, "chardev",
+ OBJECT(vhi->vhost), "chardev", &error_abort);
+}
+
+static void vhost_input_finalize(Object *obj)
+{
+ VHostUserInput *vhi = VHOST_USER_INPUT(obj);
+
+ object_unref(OBJECT(vhi->vhost));
+}
+
+static const TypeInfo vhost_input_info = {
+ .name = TYPE_VHOST_USER_INPUT,
+ .parent = TYPE_VIRTIO_INPUT,
+ .instance_size = sizeof(VHostUserInput),
+ .instance_init = vhost_input_init,
+ .instance_finalize = vhost_input_finalize,
+ .class_init = vhost_input_class_init,
+};
+
+static void vhost_input_register_types(void)
+{
+ type_register_static(&vhost_input_info);
+}
+
+type_init(vhost_input_register_types)
diff --git a/hw/virtio/vhost-user-input-pci.c b/hw/virtio/vhost-user-input-pci.c
new file mode 100644
index 0000000000..3d1b7a85fd
--- /dev/null
+++ b/hw/virtio/vhost-user-input-pci.c
@@ -0,0 +1,53 @@
+/*
+ * This work is licensed under the terms of the GNU LGPL, version 2 or
+ * later. See the COPYING.LIB file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+
+#include "hw/virtio/virtio.h"
+#include "hw/virtio/virtio-input.h"
+#include "qapi/error.h"
+#include "qemu/error-report.h"
+#include "virtio-pci.h"
+
+typedef struct VHostUserInputPCI VHostUserInputPCI;
+
+#define TYPE_VHOST_USER_INPUT_PCI "vhost-user-input-pci-base"
+
+#define VHOST_USER_INPUT_PCI(obj) \
+ OBJECT_CHECK(VHostUserInputPCI, (obj), TYPE_VHOST_USER_INPUT_PCI)
+
+struct VHostUserInputPCI {
+ VirtIOPCIProxy parent_obj;
+ VHostUserInput vhi;
+};
+
+static void vhost_user_input_pci_instance_init(Object *obj)
+{
+ VHostUserInputPCI *dev = VHOST_USER_INPUT_PCI(obj);
+
+ virtio_instance_init_common(obj, &dev->vhi, sizeof(dev->vhi),
+ TYPE_VHOST_USER_INPUT);
+
+ object_property_add_alias(obj, "chardev",
+ OBJECT(&dev->vhi), "chardev",
+ &error_abort);
+}
+
+static const VirtioPCIDeviceTypeInfo vhost_user_input_pci_info = {
+ .base_name = TYPE_VHOST_USER_INPUT_PCI,
+ .generic_name = "vhost-user-input-pci",
+ .transitional_name = "vhost-user-input-pci-transitional",
+ .non_transitional_name = "vhost-user-input-pci-non-transitional",
+ .parent = TYPE_VIRTIO_INPUT_PCI,
+ .instance_size = sizeof(VHostUserInputPCI),
+ .instance_init = vhost_user_input_pci_instance_init,
+};
+
+static void vhost_user_input_pci_register(void)
+{
+ virtio_pci_types_register(&vhost_user_input_pci_info);
+}
+
+type_init(vhost_user_input_pci_register)
diff --git a/MAINTAINERS b/MAINTAINERS
index 2e40390ebc..6d4a10b390 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1521,6 +1521,7 @@ L: qemu-s390x@nongnu.org
virtio-input
M: Gerd Hoffmann <kraxel@redhat.com>
S: Maintained
+F: hw/input/vhost-user-input.c
F: hw/input/virtio-input*.c
F: include/hw/virtio/virtio-input.h
diff --git a/hw/input/Kconfig b/hw/input/Kconfig
index e2e66f0858..50e55e3538 100644
--- a/hw/input/Kconfig
+++ b/hw/input/Kconfig
@@ -29,5 +29,10 @@ config VIRTIO_INPUT_HOST
default y
depends on VIRTIO && LINUX
+config VHOST_USER_INPUT
+ bool
+ default y
+ depends on VIRTIO_INPUT && VHOST_USER
+
config TSC210X
bool
diff --git a/hw/input/Makefile.objs b/hw/input/Makefile.objs
index c8b00f71ec..9511e3102f 100644
--- a/hw/input/Makefile.objs
+++ b/hw/input/Makefile.objs
@@ -11,6 +11,7 @@ common-obj-$(CONFIG_VIRTIO_INPUT) += virtio-input.o
common-obj-$(CONFIG_VIRTIO_INPUT) += virtio-input-hid.o
ifeq ($(CONFIG_LINUX),y)
common-obj-$(CONFIG_VIRTIO_INPUT) += virtio-input-host.o
+common-obj-$(CONFIG_VHOST_USER_INPUT) += vhost-user-input.o
endif
obj-$(CONFIG_MILKYMIST) += milkymist-softusb.o
diff --git a/hw/virtio/Makefile.objs b/hw/virtio/Makefile.objs
index f2ab667a21..5570ea8df8 100644
--- a/hw/virtio/Makefile.objs
+++ b/hw/virtio/Makefile.objs
@@ -17,6 +17,7 @@ obj-$(CONFIG_VHOST_VSOCK) += vhost-vsock.o
ifeq ($(CONFIG_VIRTIO_PCI),y)
obj-$(CONFIG_VHOST_VSOCK) += vhost-vsock-pci.o
obj-$(CONFIG_VHOST_USER_BLK) += vhost-user-blk-pci.o
+obj-$(CONFIG_VHOST_USER_INPUT) += vhost-user-input-pci.o
obj-$(CONFIG_VHOST_USER_SCSI) += vhost-user-scsi-pci.o
obj-$(CONFIG_VHOST_SCSI) += vhost-scsi-pci.o
obj-$(CONFIG_VIRTIO_INPUT_HOST) += virtio-input-host-pci.o
--
2.21.0.777.g83232e3864
^ permalink raw reply related [flat|nested] 16+ messages in thread* [Qemu-devel] [PATCH v2 6/6] contrib: add vhost-user-input
2019-05-03 13:00 [Qemu-devel] [PATCH v2 0/6] Add vhost-user-input Marc-André Lureau
` (4 preceding siblings ...)
2019-05-03 13:00 ` [Qemu-devel] [PATCH v2 5/6] util: simplify unix_listen() Marc-André Lureau
@ 2019-05-03 13:00 ` Marc-André Lureau
2019-05-09 12:34 ` [Qemu-devel] [PATCH v2 0/6] Add vhost-user-input Michael S. Tsirkin
6 siblings, 0 replies; 16+ messages in thread
From: Marc-André Lureau @ 2019-05-03 13:00 UTC (permalink / raw)
To: qemu-devel; +Cc: kraxel, mst
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-input device via a UNIX socket:
$ vhost-user-input -p /dev/input/eventX -s /tmp/vui.sock
$ qemu ... -chardev socket,id=vuic,path=/tmp/vui.sock
-device vhost-user-input-pci,chardev=vuic
This example is intentionally not included in $TOOLS, and not
installed by default.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
contrib/vhost-user-input/main.c | 393 +++++++++++++++++++++++++
MAINTAINERS | 1 +
Makefile | 11 +
Makefile.objs | 1 +
contrib/vhost-user-input/Makefile.objs | 1 +
5 files changed, 407 insertions(+)
create mode 100644 contrib/vhost-user-input/main.c
create mode 100644 contrib/vhost-user-input/Makefile.objs
diff --git a/contrib/vhost-user-input/main.c b/contrib/vhost-user-input/main.c
new file mode 100644
index 0000000000..8d493f598e
--- /dev/null
+++ b/contrib/vhost-user-input/main.c
@@ -0,0 +1,393 @@
+/*
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * (at your option) any later version. See the COPYING file in the
+ * top-level directory.
+ */
+
+#include "qemu/osdep.h"
+
+#include <glib.h>
+#include <linux/input.h>
+
+#include "qemu/iov.h"
+#include "qemu/bswap.h"
+#include "qemu/sockets.h"
+#include "contrib/libvhost-user/libvhost-user.h"
+#include "contrib/libvhost-user/libvhost-user-glib.h"
+#include "standard-headers/linux/virtio_input.h"
+#include "qapi/error.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_config *sel_config;
+ struct {
+ virtio_input_event event;
+ VuVirtqElement *elem;
+ } *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;
+ int i, len;
+
+ /* queue up events ... */
+ if (vi->qindex == vi->qsize) {
+ vi->qsize++;
+ vi->queue = g_realloc_n(vi->queue, vi->qsize, sizeof(vi->queue[0]));
+ }
+ vi->queue[vi->qindex++].event = *event;
+
+ /* ... until we see a report sync ... */
+ if (event->type != htole16(EV_SYN) ||
+ event->code != htole16(SYN_REPORT)) {
+ return;
+ }
+
+ /* ... then check available space ... */
+ for (i = 0; i < vi->qindex; i++) {
+ elem = vu_queue_pop(dev, vq, sizeof(VuVirtqElement));
+ if (!elem) {
+ while (--i >= 0) {
+ vu_queue_unpop(dev, vq, vi->queue[i].elem, 0);
+ }
+ vi->qindex = 0;
+ g_warning("virtio-input queue full");
+ return;
+ }
+ vi->queue[i].elem = elem;
+ }
+
+ /* ... and finally pass them to the guest */
+ for (i = 0; i < vi->qindex; i++) {
+ elem = vi->queue[i].elem;
+ len = iov_from_buf(elem->in_sg, elem->in_num,
+ 0, &vi->queue[i].event, 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", G_STRFUNC);
+
+ 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(EXIT_FAILURE);
+}
+
+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 == 1) {
+ vu_set_queue_handler(dev, vq, started ? vi_handle_sts : NULL);
+ }
+
+ started = vu_queue_started(dev, vu_get_queue(dev, 0)) &&
+ vu_queue_started(dev, vu_get_queue(dev, 1));
+
+ if (started && !vi->evsrc) {
+ vi->evsrc = vug_source_new(&vi->dev, vi->evdevfd,
+ G_IO_IN, vi_evdev_watch, vi);
+ }
+
+ if (!started && vi->evsrc) {
+ g_source_destroy(vi->evsrc);
+ vi->evsrc = NULL;
+ }
+}
+
+static virtio_input_config *
+vi_find_config(VuInput *vi, uint8_t select, uint8_t subsel)
+{
+ virtio_input_config *cfg;
+ int i;
+
+ for (i = 0; i < vi->config->len; i++) {
+ cfg = &g_array_index(vi->config, virtio_input_config, i);
+ if (select == cfg->select && subsel == cfg->subsel) {
+ return cfg;
+ }
+ }
+
+ return NULL;
+}
+
+static int vi_get_config(VuDev *dev, uint8_t *config, uint32_t len)
+{
+ VuInput *vi = container_of(dev, VuInput, dev.parent);
+
+ g_return_val_if_fail(len <= sizeof(*vi->sel_config), -1);
+
+ if (vi->sel_config) {
+ memcpy(config, vi->sel_config, len);
+ } else {
+ memset(config, 0, len);
+ }
+
+ return 0;
+}
+
+static int vi_set_config(VuDev *dev, const uint8_t *data,
+ uint32_t offset, uint32_t size,
+ uint32_t flags)
+{
+ VuInput *vi = container_of(dev, VuInput, dev.parent);
+ virtio_input_config *config = (virtio_input_config *)data;
+
+ vi->sel_config = vi_find_config(vi, config->select, config->subsel);
+
+ return 0;
+}
+
+static const VuDevIface vuiface = {
+ .queue_set_started = vi_queue_set_started,
+ .get_config = vi_get_config,
+ .set_config = vi_set_config,
+};
+
+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 char *opt_evdev;
+static int opt_fdnum = -1;
+static char *opt_socket_path;
+static gboolean opt_nograb;
+static gboolean opt_print_caps;
+
+static GOptionEntry entries[] = {
+ { "print-capabilities", 'c', 0, G_OPTION_ARG_NONE, &opt_print_caps,
+ "Print capabilities", NULL },
+ { "no-grab", 'n', 0, G_OPTION_ARG_NONE, &opt_nograb,
+ "Don't grab device", NULL },
+ { "fd", 'f', 0, G_OPTION_ARG_INT, &opt_fdnum,
+ "Use inherited fd socket", "FDNUM" },
+ { "socket-path", 's', 0, G_OPTION_ARG_FILENAME, &opt_socket_path,
+ "Use UNIX socket path", "PATH" },
+ { "evdev-path", 'p', 0, G_OPTION_ARG_FILENAME, &opt_evdev,
+ "evdev input device path", "PATH" },
+ { 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(NULL);
+ 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(EXIT_FAILURE);
+ }
+ if (opt_print_caps) {
+ g_print("{\n");
+ g_print(" \"type\": \"input\",\n");
+ g_print(" \"features\": [\n");
+ g_print(" \"evdev-path\",\n");
+ g_print(" \"no-grab\"\n");
+ g_print(" ]\n");
+ g_print("}\n");
+ exit(EXIT_SUCCESS);
+ }
+ if (!opt_evdev) {
+ g_printerr("Please specify an evdev path\n");
+ exit(EXIT_FAILURE);
+ }
+ if ((!!opt_socket_path + (opt_fdnum != -1)) != 1) {
+ g_printerr("Please specify either --fd or --socket-path\n");
+ exit(EXIT_FAILURE);
+ }
+
+ vi.evdevfd = open(opt_evdev, O_RDWR);
+ if (vi.evdevfd < 0) {
+ g_printerr("Failed to open evdev: %s\n", g_strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+
+ rc = ioctl(vi.evdevfd, EVIOCGVERSION, &ver);
+ if (rc < 0) {
+ g_printerr("%s: is not an evdev device\n", argv[1]);
+ exit(EXIT_FAILURE);
+ }
+
+ if (!opt_nograb) {
+ rc = ioctl(vi.evdevfd, EVIOCGRAB, 1);
+ if (rc < 0) {
+ g_printerr("Failed to grab device\n");
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ 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 (opt_socket_path) {
+ int lsock = unix_listen(opt_socket_path, &error_fatal);
+ fd = accept(lsock, NULL, NULL);
+ close(lsock);
+ } else {
+ fd = opt_fdnum;
+ }
+ if (fd == -1) {
+ g_printerr("Invalid socket");
+ exit(EXIT_FAILURE);
+ }
+ 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);
+
+ if (vi.evsrc) {
+ g_source_unref(vi.evsrc);
+ }
+ g_array_free(vi.config, TRUE);
+ g_free(vi.queue);
+ return 0;
+}
diff --git a/MAINTAINERS b/MAINTAINERS
index 6d4a10b390..89c6d517ed 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1524,6 +1524,7 @@ S: Maintained
F: hw/input/vhost-user-input.c
F: hw/input/virtio-input*.c
F: include/hw/virtio/virtio-input.h
+F: contrib/vhost-user-input/*
virtio-serial
M: Amit Shah <amit@kernel.org>
diff --git a/Makefile b/Makefile
index 1211e78c91..6633f472a3 100644
--- a/Makefile
+++ b/Makefile
@@ -406,6 +406,7 @@ dummy := $(call unnest-vars,, \
libvhost-user-obj-y \
vhost-user-scsi-obj-y \
vhost-user-blk-obj-y \
+ vhost-user-input-obj-y \
qga-vss-dll-obj-y \
block-obj-y \
block-obj-m \
@@ -615,6 +616,16 @@ rdmacm-mux$(EXESUF): LIBS += "-libumad"
rdmacm-mux$(EXESUF): $(rdmacm-mux-obj-y) $(COMMON_LDADDS)
$(call LINK, $^)
+ifdef CONFIG_VHOST_USER_INPUT
+ifdef CONFIG_LINUX
+vhost-user-input$(EXESUF): $(vhost-user-input-obj-y) libvhost-user.a libqemuutil.a
+ $(call LINK, $^)
+
+# build by default, do not install
+all: vhost-user-input$(EXESUF)
+endif
+endif
+
module_block.h: $(SRC_PATH)/scripts/modules/module_block.py config-host.mak
$(call quiet-command,$(PYTHON) $< $@ \
$(addprefix $(SRC_PATH)/,$(patsubst %.mo,%.c,$(block-obj-m))), \
diff --git a/Makefile.objs b/Makefile.objs
index cf065de5ed..27502b7df1 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -122,6 +122,7 @@ 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/
rdmacm-mux-obj-y = contrib/rdmacm-mux/
+vhost-user-input-obj-y = contrib/vhost-user-input/
######################################################################
trace-events-subdirs =
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
--
2.21.0.777.g83232e3864
^ permalink raw reply related [flat|nested] 16+ messages in thread