Listing 2. I/O Callbacks (used in launcher.c)

static int my_inb(void *opaque, int16_t addr, uint8_t *data)
                     { puts ("inb"); return 0; }

static int my_inw(void *opaque, uint16_t addr, uint16_t *data)
                     { puts ("inw"); return 0; }

static int my_inl(void *opaque, uint16_t addr, uint32_t *data)
                     { puts ("inl"); return 0; }

static int my_outb(void *opaque, uint16_t addr, uint8_t data)
                     { puts ("outb"); return 0; }

static int my_outw(void *opaque, uint16_t addr, uint16_t data)
                     { puts ("outw"); return 0; }

static int my_outl (void *opaque, uint16_t addr, uint32_t data)
                     { puts ("outl"); return 0; }

static int my_pre_kvm_run(void *opaque, int vcpu)
                     { return 0; }

  ... and similar for my_mmio_read, my_mmio_write,
      my_debug, my_halt, my_shutdown, my_io_window,
      my_try_push_interrupts, my_try_push_nmi,
      my_post_kvm_run, and my_tpr_access

static struct kvm_callbacks my_callbacks = {
    .inb                 = my_inb,
    .inw                 = my_inw,
    .inl                 = my_inl,
    .outb                = my_outb,
    .outw                = my_outw,
    .outl                = my_outl,
    .mmio_read           = my_mmio_read,
    .mmio_write          = my_mmio_write,
    .debug               = my_debug,
    .halt                = my_halt,
    .io_window           = my_io_window,
    .try_push_interrupts = my_try_push_interrupts,
    .try_push_nmi        = my_try_push_nmi,  // added in kvm-77
    .post_kvm_run        = my_post_kvm_run,
    .pre_kvm_run         = my_pre_kvm_run,
    .tpr_access          = my_tpr_access
};