改qemu記錄

/home/qemutest/qemu-1.7.1/include/hw/pci

#define PCI_DEVICE_ID_VIRTIO_MYDEVICE    0x1006 //cocotion modify

virtio-pci.c 有改  ==> 現在再改

./hw/virtio/virtio-pci.h 有改

/home/qemutest/qemu-1.7.1/hw/virtio/virtio-pci.c

改了這些：

mydevice_pci_stats_get_all
mydevice_pci_stats_get_poll_interval
mydevice_pci_stats_set_poll_interval
 Property virtio_mydevice_pci_properties[]
virtio_mydevice_pci_init
virtio_mydevice_pci_class_init
virtio_mydevice_pci_instance_init
TypeInfo virtio_mydevice_pci_info 

新增

/home/qemutest/qemu-1.7.1/hw/virtio/virtio-mydevice.c

此檔為balloon的copy, 之後開始來trace他
===========================================

改./include/hw/virtio/virtio-mydevice.h

typedef struct VirtIOmydevice {

    VirtIODevice parent_obj;

    VirtQueue *ivq, *dvq, *svq;

    uint32_t num_pages;

    uint32_t actual;

    uint64_t stats[VIRTIO_MYDEVICE_S_NR];

    VirtQueueElement stats_vq_elem;

    size_t stats_vq_offset;

    QEMUTimer *stats_timer;

    int64_t stats_last_update;

    int64_t stats_poll_interval;

} VirtIOmydevice;

原本的VirtIODevice 放在./include/hw/virtio/virtio.h

struct VirtIODevice

{

    DeviceState parent_obj;

    const char *name;

    uint8_t status;

    uint8_t isr;

    uint16_t queue_sel;

    uint32_t guest_features;

    size_t config_len;

    void *config;

    uint16_t config_vector;

    int nvectors;

    VirtQueue *vq;

    uint16_t device_id;

    bool vm_running;

    VMChangeStateEntry *vmstate;

    char *bus_name;

};

以及operation:

typedef struct VirtioDeviceClass {

    /* This is what a VirtioDevice must implement */

    DeviceClass parent;

    int (*init)(VirtIODevice *vdev);

    void (*exit)(VirtIODevice *vdev);

    uint32_t (*get_features)(VirtIODevice *vdev, uint32_t requested_features);

    uint32_t (*bad_features)(VirtIODevice *vdev);

    void (*set_features)(VirtIODevice *vdev, uint32_t val);

    void (*get_config)(VirtIODevice *vdev, uint8_t *config);

    void (*set_config)(VirtIODevice *vdev, const uint8_t *config);

    void (*reset)(VirtIODevice *vdev);

    void (*set_status)(VirtIODevice *vdev, uint8_t val);

    /* Test and clear event pending status.

     * Should be called after unmask to avoid losing events.

     * If backend does not support masking,

     * must check in frontend instead.

     */

    bool (*guest_notifier_pending)(VirtIODevice *vdev, int n); 

    /* Mask/unmask events from this vq. Any events reported

     * while masked will become pending.

     * If backend does not support masking,

     * must mask in frontend instead.

     */

    void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask);

} VirtioDeviceClass;


VIRTIOQUEUE 相關：

typedef struct VirtQueueElement

{

    unsigned int index;

    unsigned int out_num;

    unsigned int in_num;

    hwaddr in_addr[VIRTQUEUE_MAX_SIZE];

    hwaddr out_addr[VIRTQUEUE_MAX_SIZE];

    struct iovec in_sg[VIRTQUEUE_MAX_SIZE];

    struct iovec out_sg[VIRTQUEUE_MAX_SIZE];

} VirtQueueElement;

之後在./hw/virtio/virtio-mydevice.c

讓自己產生的device operation指向VirtioDeviceClass 以及相關class, 像是繼承:

static void virtio_mydevice_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);

    dc->props = virtio_mydevice_properties;

    set_bit(DEVICE_CATEGORY_MISC, dc->categories);

    vdc->init = virtio_mydevice_device_init;

    vdc->exit = virtio_mydevice_device_exit;

    vdc->get_config = virtio_mydevice_get_config;

    vdc->set_config = virtio_mydevice_set_config;

    vdc->get_features = virtio_mydevice_get_features;

}

另外在./include/hw/virtio/virtio-mydevice.h改了virtio_mydevice_config:

struct virtio_mydevice_config

{

    int config; //cocotion test

    /* Number of pages host wants Guest to give up. */

    uint32_t num_pages;

    /* Number of pages we've actually got in balloon. */

    uint32_t actual;

};