kvm__init
ざっくり
以下の処理
support check(risc-vでは無し, kvm.koでっているので) #TODO すべてそうでは? /dev/kvmをopen
ioctl KVM_GET_API_VERSION
ioctl KVM_CREATE_VM
KVM_CHECK_EXTENSINO
これら両方からだった
どこでfirmwareを入れている?
kvmtoolをビルド時に, opensbi関連も、必要だったので、もうlinkされているからそれを使うのではと思っっているが、まだわかっていない #TODO code:kvm.c
int kvm__init(struct kvm *kvm)
{
int ret;
if (!kvm__arch_cpu_supports_vm()) {
pr_err("Your CPU does not support hardware virtualization");
ret = -ENOSYS;
goto err;
}
kvm->sys_fd = open(kvm->cfg.dev, O_RDWR);
if (kvm->sys_fd < 0) {
if (errno == ENOENT)
pr_err("'%s' not found. Please make sure your kernel has CONFIG_KVM "
"enabled and that the KVM modules are loaded.", kvm->cfg.dev);
else if (errno == ENODEV)
pr_err("'%s' KVM driver not available.\n # (If the KVM "
"module is loaded then 'dmesg' may offer further clues "
"about the failure.)", kvm->cfg.dev);
else
pr_err("Could not open %s: ", kvm->cfg.dev);
ret = -errno;
goto err_free;
}
ret = ioctl(kvm->sys_fd, KVM_GET_API_VERSION, 0);
if (ret != KVM_API_VERSION) {
pr_err("KVM_API_VERSION ioctl");
ret = -errno;
goto err_sys_fd;
}
kvm->vm_fd = ioctl(kvm->sys_fd, KVM_CREATE_VM, KVM_VM_TYPE);
if (kvm->vm_fd < 0) {
pr_err("KVM_CREATE_VM ioctl");
ret = kvm->vm_fd;
goto err_sys_fd;
}
if (kvm__check_extensions(kvm)) {
pr_err("A required KVM extension is not supported by OS");
ret = -ENOSYS;
goto err_vm_fd;
}
kvm__arch_init(kvm, kvm->cfg.hugetlbfs_path, kvm->cfg.ram_size);
INIT_LIST_HEAD(&kvm->mem_banks);
kvm__init_ram(kvm);
if (!kvm->cfg.firmware_filename) {
if (!kvm__load_kernel(kvm, kvm->cfg.kernel_filename,
kvm->cfg.initrd_filename, kvm->cfg.real_cmdline))
die("unable to load kernel %s", kvm->cfg.kernel_filename);
}
if (kvm->cfg.firmware_filename) {
if (!kvm__load_firmware(kvm, kvm->cfg.firmware_filename))
die("unable to load firmware image %s: %s", kvm->cfg.firmware_filename, strerror(errno));
} else {
ret = kvm__arch_setup_firmware(kvm);
if (ret < 0)
die("kvm__arch_setup_firmware() failed with error %d\n", ret);
}
return 0;
err_vm_fd:
close(kvm->vm_fd);
err_sys_fd:
close(kvm->sys_fd);
err_free:
free(kvm);
err:
return ret;
}