Archipelago » qemu

#ifndef VHOST_H

#define VHOST_H

#include "hw/hw.h"

#include "hw/virtio/virtio.h"

#include "exec/memory.h"

/* Generic structures common for any vhost based device. */

struct vhost_virtqueue {

    int kick;

    int call;

    void *desc;

    void *avail;

    void *used;

    int num;

    unsigned long long used_phys;

    unsigned used_size;

    void *ring;

    unsigned long long ring_phys;

    unsigned ring_size;

    EventNotifier masked_notifier;

};

typedef unsigned long vhost_log_chunk_t;

#define VHOST_LOG_PAGE 0x1000

#define VHOST_LOG_BITS (8 * sizeof(vhost_log_chunk_t))

#define VHOST_LOG_CHUNK (VHOST_LOG_PAGE * VHOST_LOG_BITS)

struct vhost_memory;

struct vhost_dev {

    MemoryListener memory_listener;

    int control;

    struct vhost_memory *mem;

    int n_mem_sections;

    MemoryRegionSection *mem_sections;

    struct vhost_virtqueue *vqs;

    int nvqs;

    /* the first virtuque which would be used by this vhost dev */

    int vq_index;

    unsigned long long features;

    unsigned long long acked_features;

    unsigned long long backend_features;

    bool started;

    bool log_enabled;

    vhost_log_chunk_t *log;

    unsigned long long log_size;

    bool force;

};

int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath,

                   bool force);

void vhost_dev_cleanup(struct vhost_dev *hdev);

bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev);

int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);

void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);

int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);

void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);

/* Test and clear masked event pending status.

 * Should be called after unmask to avoid losing events.

 */

bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n);

/* Mask/unmask events from this vq.

 */

void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,

                          bool mask);

#endif