virtio: split into vhost-user-base and vhost-user-device

Lets keep a cleaner split between the base class and the derived
vhost-user-device which we can use for generic vhost-user stubs. This
includes an update to introduce the vq_size property so the number of
entries in a virtq can be defined.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240104210945.1223134-2-alex.bennee@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/include/hw/virtio/vhost-user-base.h b/include/hw/virtio/vhost-user-base.h
new file mode 100644
index 0000000000..51d0968b89
--- /dev/null
+++ b/include/hw/virtio/vhost-user-base.h
@@ -0,0 +1,49 @@
+/*
+ * Vhost-user generic virtio device
+ *
+ * Copyright (c) 2023 Linaro Ltd
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef QEMU_VHOST_USER_BASE_H
+#define QEMU_VHOST_USER_BASE_H
+
+#include "hw/virtio/vhost.h"
+#include "hw/virtio/vhost-user.h"
+
+#define TYPE_VHOST_USER_BASE "vhost-user-base"
+
+OBJECT_DECLARE_TYPE(VHostUserBase, VHostUserBaseClass, VHOST_USER_BASE)
+
+struct VHostUserBase {
+    VirtIODevice parent_obj;
+
+    /* Properties */
+    CharBackend chardev;
+    uint16_t virtio_id;
+    uint32_t num_vqs;
+    uint32_t vq_size; /* can't exceed VIRTIO_QUEUE_MAX */
+    uint32_t config_size;
+    /* State tracking */
+    VhostUserState vhost_user;
+    struct vhost_virtqueue *vhost_vq;
+    struct vhost_dev vhost_dev;
+    GPtrArray *vqs;
+    bool connected;
+};
+
+/*
+ * Needed so we can use the base realize after specialisation
+ * tweaks
+ */
+struct VHostUserBaseClass {
+    VirtioDeviceClass parent_class;
+
+    DeviceRealize parent_realize;
+};
+
+
+#define TYPE_VHOST_USER_DEVICE "vhost-user-device"
+
+#endif /* QEMU_VHOST_USER_BASE_H */