int kvm_arch_init()

in kvm/arm.c [2119:2189]

• 58 lines of code
• 16 McCabe index (conditional complexity)

int kvm_arch_init(void *opaque)
{
	int err;
	bool in_hyp_mode;

	if (!is_hyp_mode_available()) {
		kvm_info("HYP mode not available\n");
		return -ENODEV;
	}

	if (kvm_get_mode() == KVM_MODE_NONE) {
		kvm_info("KVM disabled from command line\n");
		return -ENODEV;
	}

	in_hyp_mode = is_kernel_in_hyp_mode();

	if (cpus_have_final_cap(ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) ||
	    cpus_have_final_cap(ARM64_WORKAROUND_1508412))
		kvm_info("Guests without required CPU erratum workarounds can deadlock system!\n" \
			 "Only trusted guests should be used on this system.\n");

	err = kvm_set_ipa_limit();
	if (err)
		return err;

	err = kvm_arm_init_sve();
	if (err)
		return err;

	if (!in_hyp_mode) {
		err = init_hyp_mode();
		if (err)
			goto out_err;
	}

	err = kvm_init_vector_slots();
	if (err) {
		kvm_err("Cannot initialise vector slots\n");
		goto out_err;
	}

	err = init_subsystems();
	if (err)
		goto out_hyp;

	if (!in_hyp_mode) {
		err = finalize_hyp_mode();
		if (err) {
			kvm_err("Failed to finalize Hyp protection\n");
			goto out_hyp;
		}
	}

	if (is_protected_kvm_enabled()) {
		kvm_info("Protected nVHE mode initialized successfully\n");
	} else if (in_hyp_mode) {
		kvm_info("VHE mode initialized successfully\n");
	} else {
		kvm_info("Hyp mode initialized successfully\n");
	}

	return 0;

out_hyp:
	hyp_cpu_pm_exit();
	if (!in_hyp_mode)
		teardown_hyp_mode();
out_err:
	return err;
}