s390/protvirt: Add sysfs firmware interface for Ultravisor information (a0f60f84) · Commits · 戴 / test

arch/s390/kernel/uv.c

+87 −0

Original line number	Diff line number	Diff line
		@@ -325,3 +325,90 @@ int arch_make_page_accessible(struct page *page)
		EXPORT_SYMBOL_GPL(arch_make_page_accessible);

		#endif

		#if defined(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) \|\| IS_ENABLED(CONFIG_KVM)
		static ssize_t uv_query_facilities(struct kobject *kobj,
		struct kobj_attribute attr, char page)
		{
		return snprintf(page, PAGE_SIZE, "%lx\n%lx\n%lx\n%lx\n",
		uv_info.inst_calls_list[0],
		uv_info.inst_calls_list[1],
		uv_info.inst_calls_list[2],
		uv_info.inst_calls_list[3]);
		}

		static struct kobj_attribute uv_query_facilities_attr =
		__ATTR(facilities, 0444, uv_query_facilities, NULL);

		static ssize_t uv_query_max_guest_cpus(struct kobject *kobj,
		struct kobj_attribute attr, char page)
		{
		return snprintf(page, PAGE_SIZE, "%d\n",
		uv_info.max_guest_cpus);
		}

		static struct kobj_attribute uv_query_max_guest_cpus_attr =
		__ATTR(max_cpus, 0444, uv_query_max_guest_cpus, NULL);

		static ssize_t uv_query_max_guest_vms(struct kobject *kobj,
		struct kobj_attribute attr, char page)
		{
		return snprintf(page, PAGE_SIZE, "%d\n",
		uv_info.max_num_sec_conf);
		}

		static struct kobj_attribute uv_query_max_guest_vms_attr =
		__ATTR(max_guests, 0444, uv_query_max_guest_vms, NULL);

		static ssize_t uv_query_max_guest_addr(struct kobject *kobj,
		struct kobj_attribute attr, char page)
		{
		return snprintf(page, PAGE_SIZE, "%lx\n",
		uv_info.max_sec_stor_addr);
		}

		static struct kobj_attribute uv_query_max_guest_addr_attr =
		__ATTR(max_address, 0444, uv_query_max_guest_addr, NULL);

		static struct attribute *uv_query_attrs[] = {
		&uv_query_facilities_attr.attr,
		&uv_query_max_guest_cpus_attr.attr,
		&uv_query_max_guest_vms_attr.attr,
		&uv_query_max_guest_addr_attr.attr,
		NULL,
		};

		static struct attribute_group uv_query_attr_group = {
		.attrs = uv_query_attrs,
		};

		static struct kset *uv_query_kset;
		static struct kobject *uv_kobj;

		static int __init uv_info_init(void)
		{
		int rc = -ENOMEM;

		if (!test_facility(158))
		return 0;

		uv_kobj = kobject_create_and_add("uv", firmware_kobj);
		if (!uv_kobj)
		return -ENOMEM;

		uv_query_kset = kset_create_and_add("query", NULL, uv_kobj);
		if (!uv_query_kset)
		goto out_kobj;

		rc = sysfs_create_group(&uv_query_kset->kobj, &uv_query_attr_group);
		if (!rc)
		return 0;

		kset_unregister(uv_query_kset);
		out_kobj:
		kobject_del(uv_kobj);
		kobject_put(uv_kobj);
		return rc;
		}
		device_initcall(uv_info_init);
		#endif

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