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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/drivers/vhost/vhost.h
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@@ -87,13 +87,17 @@
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 	/* The routine to call when the Guest pings us, or timeout. */
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 	vhost_work_fn_t handle_kick;
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-	/* Last available index we saw. */
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+	/* Last available index we saw.
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+	 * Values are limited to 0x7fff, and the high bit is used as
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+	 * a wrap counter when using VIRTIO_F_RING_PACKED. */
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 	u16 last_avail_idx;
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 	/* Caches available index value from user. */
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 	u16 avail_idx;
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-	/* Last index we used. */
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+	/* Last index we used.
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+	 * Values are limited to 0x7fff, and the high bit is used as
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+	 * a wrap counter when using VIRTIO_F_RING_PACKED. */
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 	u16 last_used_idx;
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 	/* Used flags */
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@@ -183,6 +187,7 @@
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 long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp);
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 bool vhost_vq_access_ok(struct vhost_virtqueue *vq);
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 bool vhost_log_access_ok(struct vhost_dev *);
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+void vhost_clear_msg(struct vhost_dev *dev);
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 int vhost_get_vq_desc(struct vhost_virtqueue *,
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 		      struct iovec iov[], unsigned int iov_count,