Inside file ./hw/virtio/virtio.c, The following structs are defined. I understood that for each virtual disk, there is a corresponding queue and this queue is implemented by a ring. My questions is what is the meaning of each element inside struct VRing?
Thanks a lot!
typedef struct VRing
{
unsigned int num;
hwaddr desc;
hwaddr avail;
hwaddr used;
} VRing;
struct VirtQueue
{
VRing vring;
hwaddr pa;
uint16_t last_avail_idx;
/* Last used index value we have signalled on */
uint16_t signalled_used;
/* Last used index value we have signalled on */
bool signalled_used_valid;
/* Notification enabled? */
bool notification;
uint16_t queue_index;
int inuse;
uint16_t vector;
void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
VirtIODevice *vdev;
EventNotifier guest_notifier;
EventNotifier host_notifier;
};
