1.5.5　加载Guest镜像到内存

在初始化VCPU时我们将代码段cs设置为0xf000，将rip设置为0，所以这里需要将Guest镜像加载到Guest的内存地址(0x1000＜＜4)+0x0处。Guest的物理内存的起始地址为ram_start，所以加载Guest镜像到内存的代码如下：

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void load_image(struct vm *vm) {
  int ret = 0;
  int fd = open("./guest/kernel.bin", O_RDONLY);
  if (fd < 0) {
    fprintf(stderr, "can not open guest image\n");
    exit(-1);
  }

  char *p = (char *)vm->ram_start + ((0x1000 << 4) + 0x0);

  while (1) {
    if ((ret = read(fd, p, 4096)) <= 0)
      break;

    p += ret;
  }
}

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