Add virtio-loopback-adapter

The virtio-loopback-adapter is part of the Virtio Loopback
architecture detailed in the following link:
  https://git.virtualopensystems.com/virtio-loopback/docs

The following vhost-user devices are supported:
- vhost-user-blk
- vhost-user-rng
- vhost-user-input
- vhost-user-gpio
- vhost-user-sound

Bug-AGL: SPEC-4834
Change-Id: I4edb28faf370992f5f45390f5c4240a0f5c3084c
Signed-off-by: Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/vhost_user_gpio.h b/vhost_user_gpio.h
new file mode 100644
index 0000000..4477ba7
--- /dev/null
+++ b/vhost_user_gpio.h
@@ -0,0 +1,37 @@
+/*
+ * Based on virtio-gpio.h of QEMU project
+ *
+ * Copyright (c) 2023 Virtual Open Systems SAS.
+ *
+ * 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.
+ */
+
+#ifndef VHOST_USER_GPIO
+#define VHOST_USER_GPIO
+
+#include "vhost_loopback.h"
+#include "vhost_user_loopback.h"
+#include "virtio_loopback.h"
+#include <linux/virtio_gpio.h>
+#include "queue.h"
+#include <sys/mman.h>
+
+#define TYPE_VHOST_USER_GPIO "vhost-user-gpio-device"
+#define VIRTIO_GPIO_F_IRQ 0
+
+struct VHostUserGPIO {
+    VirtIODevice *parent;
+    struct virtio_gpio_config config;
+    struct vhost_virtqueue *vhost_vqs;
+    struct vhost_dev *vhost_dev;
+    VirtQueue *command_vq;
+    VirtQueue *interrupt_vq;
+    bool connected;
+    bool started_vu;
+};
+
+void vu_gpio_device_realize();
+
+#endif /* VHOST_USER_GPIO */