[RFC 05/10] vdpa-dev: implement the realize interface

[Longpeng(Mike)]

From: Longpeng <longpeng2@huawei.com>

Implements the .realize interface.

Signed-off-by: Longpeng <longpeng2@huawei.com>
---
 hw/virtio/vdpa-dev.c         | 114 +++++++++++++++++++++++++++++++++++
 include/hw/virtio/vdpa-dev.h |   8 +++
 2 files changed, 122 insertions(+)

diff --git a/hw/virtio/vdpa-dev.c b/hw/virtio/vdpa-dev.c
index 790117fb3b..2d534d837a 100644
--- a/hw/virtio/vdpa-dev.c
+++ b/hw/virtio/vdpa-dev.c
@@ -15,9 +15,122 @@
 #include "sysemu/sysemu.h"
 #include "sysemu/runstate.h"
 
+static void
+vhost_vdpa_device_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq)
+{
+    /* Nothing to do */
+}
+
+static int vdpa_dev_get_info_by_fd(int fd, uint64_t cmd, Error **errp)
+{
+    int val;
+
+    if (ioctl(fd, cmd, &val) < 0) {
+        error_setg(errp, "vhost-vdpa-device: cmd 0x%lx failed: %s",
+                   cmd, strerror(errno));
+        return -1;
+    }
+
+    return val;
+}
+
+static inline int vdpa_dev_get_queue_size(int fd, Error **errp)
+{
+    return vdpa_dev_get_info_by_fd(fd, VHOST_VDPA_GET_VRING_NUM, errp);
+}
+
+static inline int vdpa_dev_get_vqs_num(int fd, Error **errp)
+{
+    return vdpa_dev_get_info_by_fd(fd, VHOST_VDPA_GET_VQS_NUM, errp);
+}
+
+static inline int vdpa_dev_get_config_size(int fd, Error **errp)
+{
+    return vdpa_dev_get_info_by_fd(fd, VHOST_VDPA_GET_CONFIG_SIZE, errp);
+}
+
 static void vhost_vdpa_device_realize(DeviceState *dev, Error **errp)
 {
+    VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+    VhostVdpaDevice *s = VHOST_VDPA_DEVICE(vdev);
+    uint32_t device_id;
+    int max_queue_size;
+    int fd;
+    int i, ret;
+
+    fd = qemu_open(s->vdpa_dev, O_RDWR, errp);
+    if (fd == -1) {
+        return;
+    }
+    s->vdpa.device_fd = fd;
+
+    max_queue_size = vdpa_dev_get_queue_size(fd, errp);
+    if (*errp) {
+        goto out;
+    }
+
+    if (s->queue_size > max_queue_size) {
+        error_setg(errp, "vhost-vdpa-device: invalid queue_size: %d (max:%d)",
+                   s->queue_size, max_queue_size);
+        goto out;
+    } else if (!s->queue_size) {
+        s->queue_size = max_queue_size;
+    }
+
+    ret = vdpa_dev_get_vqs_num(fd, errp);
+    if (*errp) {
+        goto out;
+    }
+
+    s->dev.nvqs = ret;
+    s->dev.vqs = g_new0(struct vhost_virtqueue, s->dev.nvqs);
+    s->dev.vq_index = 0;
+    s->dev.vq_index_end = s->dev.nvqs;
+    s->dev.backend_features = 0;
+    s->started = false;
+
+    ret = vhost_dev_init(&s->dev, &s->vdpa, VHOST_BACKEND_TYPE_VDPA, 0, NULL);
+    if (ret < 0) {
+        error_setg(errp, "vhost-vdpa-device: vhost initialization failed: %s",
+                   strerror(-ret));
+        goto out;
+    }
+
+    ret = s->dev.vhost_ops->vhost_get_device_id(&s->dev, &device_id);
+    if (ret < 0) {
+        error_setg(errp, "vhost-vdpa-device: vhost get device id failed: %s",
+                   strerror(-ret));
+        goto vhost_cleanup;
+    }
+
+    s->config_size = vdpa_dev_get_config_size(fd, errp);
+    if (*errp) {
+        goto vhost_cleanup;
+    }
+
+    s->config = g_malloc0(s->config_size);
+
+    ret = vhost_dev_get_config(&s->dev, s->config, s->config_size, NULL);
+    if (ret < 0) {
+        error_setg(errp, "vhost-vdpa-device: get config failed");
+        goto config_err;
+    }
+
+    virtio_init(vdev, "vhost-vdpa", device_id, s->config_size);
+
+    s->virtqs = g_new0(VirtQueue *, s->dev.nvqs);
+    for (i = 0; i < s->dev.nvqs; i++) {
+        s->virtqs[i] = virtio_add_queue(vdev, s->queue_size,
+                                        vhost_vdpa_device_dummy_handle_output);
+    }
+
     return;
+config_err:
+    g_free(s->config);
+vhost_cleanup:
+    vhost_dev_cleanup(&s->dev);
+out:
+    close(fd);
 }
 
 static void vhost_vdpa_device_unrealize(DeviceState *dev)
@@ -51,6 +164,7 @@ static void vhost_vdpa_device_set_status(VirtIODevice *vdev, 
uint8_t status)
 
 static Property vhost_vdpa_device_properties[] = {
     DEFINE_PROP_STRING("vdpa-dev", VhostVdpaDevice, vdpa_dev),
+    DEFINE_PROP_UINT16("queue-size", VhostVdpaDevice, queue_size, 0),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/include/hw/virtio/vdpa-dev.h b/include/hw/virtio/vdpa-dev.h
index 7a0e6bdcf8..49f8145d61 100644
--- a/include/hw/virtio/vdpa-dev.h
+++ b/include/hw/virtio/vdpa-dev.h
@@ -13,6 +13,14 @@ struct VhostVdpaDevice {
     VirtIODevice parent_obj;
     char *vdpa_dev;
     int32_t bootindex;
+    struct vhost_dev dev;
+    struct vhost_vdpa vdpa;
+    VirtQueue **virtqs;
+    uint8_t *config;
+    int config_size;
+    uint32_t num_queues;
+    uint16_t queue_size;
+    bool started;
 };
 
 #endif
-- 
2.23.0