[PATCH v2 05/10] vdpa-dev: implement the realize interface

["Longpeng(Mike)" via <qemu-devel@nongnu.org>]

From: Longpeng <longpeng2@huawei.com>

Implements the .realize interface.

Signed-off-by: Longpeng <longpeng2@huawei.com>
---
 hw/virtio/vdpa-dev.c         | 101 +++++++++++++++++++++++++++++++++++
 include/hw/virtio/vdpa-dev.h |   8 +++
 2 files changed, 109 insertions(+)

diff --git a/hw/virtio/vdpa-dev.c b/hw/virtio/vdpa-dev.c
index b103768f33..bd28cf7a15 100644
--- a/hw/virtio/vdpa-dev.c
+++ b/hw/virtio/vdpa-dev.c
@@ -27,9 +27,109 @@ uint32_t vhost_vdpa_device_get_u32(int fd, unsigned long int cmd, Error **errp)
     return val;
 }
 
+static void
+vhost_vdpa_device_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq)
+{
+    /* Nothing to do */
+}
+
 static void vhost_vdpa_device_realize(DeviceState *dev, Error **errp)
 {
+    VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+    VhostVdpaDevice *s = VHOST_VDPA_DEVICE(vdev);
+    uint32_t vdev_id, max_queue_size;
+    struct vhost_virtqueue *vqs;
+    int i, ret;
+
+    if (s->vdpa_dev_fd == -1) {
+        s->vdpa_dev_fd = qemu_open(s->vdpa_dev, O_RDWR, errp);
+        if (*errp) {
+            return;
+        }
+    }
+    s->vdpa.device_fd = s->vdpa_dev_fd;
+
+    max_queue_size = vhost_vdpa_device_get_u32(s->vdpa_dev_fd,
+                                               VHOST_VDPA_GET_VRING_NUM, 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;
+    }
+
+    s->num_queues = vhost_vdpa_device_get_u32(s->vdpa_dev_fd,
+                                              VHOST_VDPA_GET_VQS_NUM, errp);
+    if (*errp) {
+        goto out;
+    }
+
+    if (!s->num_queues || s->num_queues > VIRTIO_QUEUE_MAX) {
+        error_setg(errp, "invalid number of virtqueues: %u (max:%u)",
+                   s->num_queues, VIRTIO_QUEUE_MAX);
+        goto out;
+    }
+
+    s->dev.nvqs = s->num_queues;
+    vqs = g_new0(struct vhost_virtqueue, s->dev.nvqs);
+    s->dev.vqs = vqs;
+    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 free_vqs;
+    }
+
+    vdev_id = vhost_vdpa_device_get_u32(s->vdpa_dev_fd,
+                                        VHOST_VDPA_GET_DEVICE_ID, errp);
+    if (ret < 0) {
+        error_setg(errp, "vhost-vdpa-device: vhost get device id failed: %s",
+                   strerror(-ret));
+        goto vhost_cleanup;
+    }
+
+    s->config_size = vhost_vdpa_device_get_u32(s->vdpa_dev_fd,
+                                               VHOST_VDPA_GET_CONFIG_SIZE, 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 free_config;
+    }
+
+    virtio_init(vdev, "vhost-vdpa", vdev_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;
+
+free_config:
+    g_free(s->config);
+vhost_cleanup:
+    vhost_dev_cleanup(&s->dev);
+free_vqs:
+    g_free(vqs);
+out:
+    qemu_close(s->vdpa_dev_fd);
+    s->vdpa_dev_fd = -1;
 }
 
 static void vhost_vdpa_device_unrealize(DeviceState *dev)
@@ -64,6 +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_INT32("vdpa-dev-fd", VhostVdpaDevice, vdpa_dev_fd, -1),
+    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 e7ad349113..e0482035cf 100644
--- a/include/hw/virtio/vdpa-dev.h
+++ b/include/hw/virtio/vdpa-dev.h
@@ -14,6 +14,14 @@ struct VhostVdpaDevice {
     char *vdpa_dev;
     int vdpa_dev_fd;
     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;
 };
 
 uint32_t vhost_vdpa_device_get_u32(int fd, unsigned long int cmd, Error **errp);
-- 
2.23.0