Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 1216 insertions, 0 deletions

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
new file mode 100644
index 000000000..0327a39d3
--- /dev/null
+++ b/drivers/firmware/efi/efi.c
@@ -0,0 +1,1216 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * efi.c - EFI subsystem
+ *
+ * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com>
+ * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com>
+ * Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
+ *
+ * This code registers /sys/firmware/efi{,/efivars} when EFI is supported,
+ * allowing the efivarfs to be mounted or the efivars module to be loaded.
+ * The existance of /sys/firmware/efi may also be used by userspace to
+ * determine that the system supports EFI.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kobject.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/debugfs.h>
+#include <linux/device.h>
+#include <linux/efi.h>
+#include <linux/of.h>
+#include <linux/initrd.h>
+#include <linux/io.h>
+#include <linux/kexec.h>
+#include <linux/platform_device.h>
+#include <linux/random.h>
+#include <linux/reboot.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+#include <linux/ucs2_string.h>
+#include <linux/memblock.h>
+#include <linux/security.h>
+#include <linux/notifier.h>
+
+#include <asm/early_ioremap.h>
+
+struct efi __read_mostly efi = {
+	.runtime_supported_mask = EFI_RT_SUPPORTED_ALL,
+	.acpi			= EFI_INVALID_TABLE_ADDR,
+	.acpi20			= EFI_INVALID_TABLE_ADDR,
+	.smbios			= EFI_INVALID_TABLE_ADDR,
+	.smbios3		= EFI_INVALID_TABLE_ADDR,
+	.esrt			= EFI_INVALID_TABLE_ADDR,
+	.tpm_log		= EFI_INVALID_TABLE_ADDR,
+	.tpm_final_log		= EFI_INVALID_TABLE_ADDR,
+	.ovmf_debug_log         = EFI_INVALID_TABLE_ADDR,
+#ifdef CONFIG_LOAD_UEFI_KEYS
+	.mokvar_table		= EFI_INVALID_TABLE_ADDR,
+#endif
+#ifdef CONFIG_EFI_COCO_SECRET
+	.coco_secret		= EFI_INVALID_TABLE_ADDR,
+#endif
+#ifdef CONFIG_UNACCEPTED_MEMORY
+	.unaccepted		= EFI_INVALID_TABLE_ADDR,
+#endif
+};
+EXPORT_SYMBOL(efi);
+
+unsigned long __ro_after_init efi_rng_seed = EFI_INVALID_TABLE_ADDR;
+static unsigned long __initdata mem_reserve = EFI_INVALID_TABLE_ADDR;
+static unsigned long __initdata rt_prop = EFI_INVALID_TABLE_ADDR;
+static unsigned long __initdata initrd = EFI_INVALID_TABLE_ADDR;
+
+extern unsigned long primary_display_table;
+
+struct mm_struct efi_mm = {
+	.mm_mt			= MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, efi_mm.mmap_lock),
+	.mm_users		= ATOMIC_INIT(2),
+	.mm_count		= ATOMIC_INIT(1),
+	.write_protect_seq      = SEQCNT_ZERO(efi_mm.write_protect_seq),
+	MMAP_LOCK_INITIALIZER(efi_mm)
+	.page_table_lock	= __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock),
+	.mmlist			= LIST_HEAD_INIT(efi_mm.mmlist),
+#ifdef CONFIG_SCHED_MM_CID
+	.mm_cid.lock		= __RAW_SPIN_LOCK_UNLOCKED(efi_mm.mm_cid.lock),
+#endif
+	.flexible_array		= MM_STRUCT_FLEXIBLE_ARRAY_INIT,
+};
+
+struct workqueue_struct *efi_rts_wq;
+
+static bool disable_runtime = IS_ENABLED(CONFIG_EFI_DISABLE_RUNTIME);
+static int __init setup_noefi(char *arg)
+{
+	disable_runtime = true;
+	return 0;
+}
+early_param("noefi", setup_noefi);
+
+bool efi_runtime_disabled(void)
+{
+	return disable_runtime;
+}
+
+bool __pure __efi_soft_reserve_enabled(void)
+{
+	return !efi_enabled(EFI_MEM_NO_SOFT_RESERVE);
+}
+
+static int __init parse_efi_cmdline(char *str)
+{
+	if (!str) {
+		pr_warn("need at least one option\n");
+		return -EINVAL;
+	}
+
+	if (parse_option_str(str, "debug"))
+		set_bit(EFI_DBG, &efi.flags);
+
+	if (parse_option_str(str, "noruntime"))
+		disable_runtime = true;
+
+	if (parse_option_str(str, "runtime"))
+		disable_runtime = false;
+
+	if (parse_option_str(str, "nosoftreserve"))
+		set_bit(EFI_MEM_NO_SOFT_RESERVE, &efi.flags);
+
+	return 0;
+}
+early_param("efi", parse_efi_cmdline);
+
+struct kobject *efi_kobj;
+
+/*
+ * Let's not leave out systab information that snuck into
+ * the efivars driver
+ * Note, do not add more fields in systab sysfs file as it breaks sysfs
+ * one value per file rule!
+ */
+static ssize_t systab_show(struct kobject *kobj,
+			   struct kobj_attribute *attr, char *buf)
+{
+	char *str = buf;
+
+	if (!kobj || !buf)
+		return -EINVAL;
+
+	if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
+		str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20);
+	if (efi.acpi != EFI_INVALID_TABLE_ADDR)
+		str += sprintf(str, "ACPI=0x%lx\n", efi.acpi);
+	/*
+	 * If both SMBIOS and SMBIOS3 entry points are implemented, the
+	 * SMBIOS3 entry point shall be preferred, so we list it first to
+	 * let applications stop parsing after the first match.
+	 */
+	if (efi.smbios3 != EFI_INVALID_TABLE_ADDR)
+		str += sprintf(str, "SMBIOS3=0x%lx\n", efi.smbios3);
+	if (efi.smbios != EFI_INVALID_TABLE_ADDR)
+		str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios);
+
+	return str - buf;
+}
+
+static struct kobj_attribute efi_attr_systab = __ATTR_RO_MODE(systab, 0400);
+
+static ssize_t fw_platform_size_show(struct kobject *kobj,
+				     struct kobj_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32);
+}
+
+extern __weak struct kobj_attribute efi_attr_fw_vendor;
+extern __weak struct kobj_attribute efi_attr_runtime;
+extern __weak struct kobj_attribute efi_attr_config_table;
+static struct kobj_attribute efi_attr_fw_platform_size =
+	__ATTR_RO(fw_platform_size);
+
+static struct attribute *efi_subsys_attrs[] = {
+	&efi_attr_systab.attr,
+	&efi_attr_fw_platform_size.attr,
+	&efi_attr_fw_vendor.attr,
+	&efi_attr_runtime.attr,
+	&efi_attr_config_table.attr,
+	NULL,
+};
+
+umode_t __weak efi_attr_is_visible(struct kobject *kobj, struct attribute *attr,
+				   int n)
+{
+	return attr->mode;
+}
+
+static const struct attribute_group efi_subsys_attr_group = {
+	.attrs = efi_subsys_attrs,
+	.is_visible = efi_attr_is_visible,
+};
+
+struct blocking_notifier_head efivar_ops_nh;
+EXPORT_SYMBOL_GPL(efivar_ops_nh);
+
+static struct efivars generic_efivars;
+static struct efivar_operations generic_ops;
+
+static bool generic_ops_supported(void)
+{
+	unsigned long name_size;
+	efi_status_t status;
+	efi_char16_t name;
+	efi_guid_t guid;
+
+	name_size = sizeof(name);
+
+	if (!efi.get_next_variable)
+		return false;
+	status = efi.get_next_variable(&name_size, &name, &guid);
+	if (status == EFI_UNSUPPORTED)
+		return false;
+
+	return true;
+}
+
+static int generic_ops_register(void)
+{
+	if (!generic_ops_supported())
+		return 0;
+
+	generic_ops.get_variable = efi.get_variable;
+	generic_ops.get_next_variable = efi.get_next_variable;
+	generic_ops.query_variable_store = efi_query_variable_store;
+	generic_ops.query_variable_info = efi.query_variable_info;
+
+	if (efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE)) {
+		generic_ops.set_variable = efi.set_variable;
+		generic_ops.set_variable_nonblocking = efi.set_variable_nonblocking;
+	}
+	return efivars_register(&generic_efivars, &generic_ops);
+}
+
+static void generic_ops_unregister(void)
+{
+	if (!generic_ops.get_variable)
+		return;
+
+	efivars_unregister(&generic_efivars);
+}
+
+void efivars_generic_ops_register(void)
+{
+	generic_ops_register();
+}
+EXPORT_SYMBOL_GPL(efivars_generic_ops_register);
+
+void efivars_generic_ops_unregister(void)
+{
+	generic_ops_unregister();
+}
+EXPORT_SYMBOL_GPL(efivars_generic_ops_unregister);
+
+#ifdef CONFIG_EFI_CUSTOM_SSDT_OVERLAYS
+#define EFIVAR_SSDT_NAME_MAX	16UL
+static char efivar_ssdt[EFIVAR_SSDT_NAME_MAX] __initdata;
+static int __init efivar_ssdt_setup(char *str)
+{
+	int ret = security_locked_down(LOCKDOWN_ACPI_TABLES);
+
+	if (ret)
+		return ret;
+
+	if (strlen(str) < sizeof(efivar_ssdt))
+		memcpy(efivar_ssdt, str, strlen(str));
+	else
+		pr_warn("efivar_ssdt: name too long: %s\n", str);
+	return 1;
+}
+__setup("efivar_ssdt=", efivar_ssdt_setup);
+
+static __init int efivar_ssdt_load(void)
+{
+	unsigned long name_size = 256;
+	efi_char16_t *name = NULL;
+	efi_status_t status;
+	efi_guid_t guid;
+	int ret = 0;
+
+	if (!efivar_ssdt[0])
+		return 0;
+
+	name = kzalloc(name_size, GFP_KERNEL);
+	if (!name)
+		return -ENOMEM;
+
+	for (;;) {
+		char utf8_name[EFIVAR_SSDT_NAME_MAX];
+		unsigned long data_size = 0;
+		void *data;
+		int limit;
+
+		status = efi.get_next_variable(&name_size, name, &guid);
+		if (status == EFI_NOT_FOUND) {
+			break;
+		} else if (status == EFI_BUFFER_TOO_SMALL) {
+			efi_char16_t *name_tmp =
+				krealloc(name, name_size, GFP_KERNEL);
+			if (!name_tmp) {
+				ret = -ENOMEM;
+				goto out;
+			}
+			name = name_tmp;
+			continue;
+		}
+
+		limit = min(EFIVAR_SSDT_NAME_MAX, name_size);
+		ucs2_as_utf8(utf8_name, name, limit - 1);
+		if (strncmp(utf8_name, efivar_ssdt, limit) != 0)
+			continue;
+
+		pr_info("loading SSDT from variable %s-%pUl\n", efivar_ssdt, &guid);
+
+		status = efi.get_variable(name, &guid, NULL, &data_size, NULL);
+		if (status != EFI_BUFFER_TOO_SMALL || !data_size) {
+			ret = -EIO;
+			goto out;
+		}
+
+		data = kmalloc(data_size, GFP_KERNEL);
+		if (!data) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		status = efi.get_variable(name, &guid, NULL, &data_size, data);
+		if (status == EFI_SUCCESS) {
+			acpi_status acpi_ret = acpi_load_table(data, NULL);
+			if (ACPI_FAILURE(acpi_ret)) {
+				pr_err("efivar_ssdt: failed to load table: %u\n",
+				       acpi_ret);
+			} else {
+				/*
+				 * The @data will be in use by ACPI engine,
+				 * do not free it!
+				 */
+				continue;
+			}
+		} else {
+			pr_err("efivar_ssdt: failed to get var data: 0x%lx\n", status);
+		}
+		kfree(data);
+	}
+out:
+	kfree(name);
+	return ret;
+}
+#else
+static inline int efivar_ssdt_load(void) { return 0; }
+#endif
+
+#ifdef CONFIG_DEBUG_FS
+
+#define EFI_DEBUGFS_MAX_BLOBS 32
+
+static struct debugfs_blob_wrapper debugfs_blob[EFI_DEBUGFS_MAX_BLOBS];
+
+static void __init efi_debugfs_init(void)
+{
+	struct dentry *efi_debugfs;
+	efi_memory_desc_t *md;
+	char name[32];
+	int type_count[EFI_BOOT_SERVICES_DATA + 1] = {};
+	int i = 0;
+
+	efi_debugfs = debugfs_create_dir("efi", NULL);
+	if (IS_ERR(efi_debugfs))
+		return;
+
+	for_each_efi_memory_desc(md) {
+		switch (md->type) {
+		case EFI_BOOT_SERVICES_CODE:
+			snprintf(name, sizeof(name), "boot_services_code%d",
+				 type_count[md->type]++);
+			break;
+		case EFI_BOOT_SERVICES_DATA:
+			snprintf(name, sizeof(name), "boot_services_data%d",
+				 type_count[md->type]++);
+			break;
+		default:
+			continue;
+		}
+
+		if (i >= EFI_DEBUGFS_MAX_BLOBS) {
+			pr_warn("More then %d EFI boot service segments, only showing first %d in debugfs\n",
+				EFI_DEBUGFS_MAX_BLOBS, EFI_DEBUGFS_MAX_BLOBS);
+			break;
+		}
+
+		debugfs_blob[i].size = md->num_pages << EFI_PAGE_SHIFT;
+		debugfs_blob[i].data = memremap(md->phys_addr,
+						debugfs_blob[i].size,
+						MEMREMAP_WB);
+		if (!debugfs_blob[i].data)
+			continue;
+
+		debugfs_create_blob(name, 0400, efi_debugfs, &debugfs_blob[i]);
+		i++;
+	}
+}
+#else
+static inline void efi_debugfs_init(void) {}
+#endif
+
+static int __init efipostcore_init(void)
+{
+	if (!efi_enabled(EFI_RUNTIME_SERVICES))
+		efi.runtime_supported_mask = 0;
+
+	if (efi.runtime_supported_mask) {
+		/*
+		 * Since we process only one efi_runtime_service() at a time, an
+		 * ordered workqueue (which creates only one execution context)
+		 * should suffice for all our needs.
+		 */
+		efi_rts_wq = alloc_ordered_workqueue("efi_runtime", WQ_SYSFS);
+		if (!efi_rts_wq) {
+			pr_err("Creating efi_rts_wq failed, EFI runtime services disabled.\n");
+			clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
+			efi.runtime_supported_mask = 0;
+		}
+	}
+	return 0;
+}
+postcore_initcall(efipostcore_init);
+
+/*
+ * We register the efi subsystem with the firmware subsystem and the
+ * efivars subsystem with the efi subsystem, if the system was booted with
+ * EFI.
+ */
+static int __init efisubsys_init(void)
+{
+	int error;
+
+	if (!efi_enabled(EFI_BOOT))
+		return 0;
+
+	if (efi_rt_services_supported(EFI_RT_SUPPORTED_TIME_SERVICES))
+		platform_device_register_simple("rtc-efi", 0, NULL, 0);
+
+	/* We register the efi directory at /sys/firmware/efi */
+	efi_kobj = kobject_create_and_add("efi", firmware_kobj);
+	if (!efi_kobj) {
+		pr_err("efi: Firmware registration failed.\n");
+		error = -ENOMEM;
+		goto err_destroy_wq;
+	}
+
+	if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE |
+				      EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME)) {
+		error = generic_ops_register();
+		if (error)
+			goto err_put;
+		error = efivar_ssdt_load();
+		if (error)
+			pr_err("efi: failed to load SSDT, error %d.\n", error);
+		platform_device_register_simple("efivars", 0, NULL, 0);
+	}
+
+	BLOCKING_INIT_NOTIFIER_HEAD(&efivar_ops_nh);
+
+	error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
+	if (error) {
+		pr_err("efi: Sysfs attribute export failed with error %d.\n",
+		       error);
+		goto err_unregister;
+	}
+
+	/* and the standard mountpoint for efivarfs */
+	error = sysfs_create_mount_point(efi_kobj, "efivars");
+	if (error) {
+		pr_err("efivars: Subsystem registration failed.\n");
+		goto err_remove_group;
+	}
+
+	if (efi_enabled(EFI_DBG) && efi_enabled(EFI_PRESERVE_BS_REGIONS))
+		efi_debugfs_init();
+
+#ifdef CONFIG_EFI_COCO_SECRET
+	if (efi.coco_secret != EFI_INVALID_TABLE_ADDR)
+		platform_device_register_simple("efi_secret", 0, NULL, 0);
+#endif
+
+	if (IS_ENABLED(CONFIG_OVMF_DEBUG_LOG) &&
+	    efi.ovmf_debug_log != EFI_INVALID_TABLE_ADDR)
+		ovmf_log_probe(efi.ovmf_debug_log);
+
+	return 0;
+
+err_remove_group:
+	sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
+err_unregister:
+	if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE |
+				      EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME))
+		generic_ops_unregister();
+err_put:
+	kobject_put(efi_kobj);
+	efi_kobj = NULL;
+err_destroy_wq:
+	if (efi_rts_wq)
+		destroy_workqueue(efi_rts_wq);
+
+	return error;
+}
+
+subsys_initcall(efisubsys_init);
+
+void __init efi_find_mirror(void)
+{
+	efi_memory_desc_t *md;
+	u64 mirror_size = 0, total_size = 0;
+
+	if (!efi_enabled(EFI_MEMMAP))
+		return;
+
+	for_each_efi_memory_desc(md) {
+		unsigned long long start = md->phys_addr;
+		unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
+
+		total_size += size;
+		if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
+			memblock_mark_mirror(start, size);
+			mirror_size += size;
+		}
+	}
+	if (mirror_size)
+		pr_info("Memory: %lldM/%lldM mirrored memory\n",
+			mirror_size>>20, total_size>>20);
+}
+
+/*
+ * Find the efi memory descriptor for a given physical address.  Given a
+ * physical address, determine if it exists within an EFI Memory Map entry,
+ * and if so, populate the supplied memory descriptor with the appropriate
+ * data.
+ */
+int __efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
+{
+	efi_memory_desc_t *md;
+
+	if (!efi_enabled(EFI_MEMMAP)) {
+		pr_err_once("EFI_MEMMAP is not enabled.\n");
+		return -EINVAL;
+	}
+
+	if (!out_md) {
+		pr_err_once("out_md is null.\n");
+		return -EINVAL;
+        }
+
+	for_each_efi_memory_desc(md) {
+		u64 size;
+		u64 end;
+
+		/* skip bogus entries (including empty ones) */
+		if ((md->phys_addr & (EFI_PAGE_SIZE - 1)) ||
+		    (md->num_pages <= 0) ||
+		    (md->num_pages > (U64_MAX - md->phys_addr) >> EFI_PAGE_SHIFT))
+			continue;
+
+		size = md->num_pages << EFI_PAGE_SHIFT;
+		end = md->phys_addr + size;
+		if (phys_addr >= md->phys_addr && phys_addr < end) {
+			memcpy(out_md, md, sizeof(*out_md));
+			return 0;
+		}
+	}
+	return -ENOENT;
+}
+
+extern int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
+	__weak __alias(__efi_mem_desc_lookup);
+EXPORT_SYMBOL_GPL(efi_mem_desc_lookup);
+
+/*
+ * Calculate the highest address of an efi memory descriptor.
+ */
+u64 __init efi_mem_desc_end(efi_memory_desc_t *md)
+{
+	u64 size = md->num_pages << EFI_PAGE_SHIFT;
+	u64 end = md->phys_addr + size;
+	return end;
+}
+
+void __init __weak efi_arch_mem_reserve(phys_addr_t addr, u64 size) {}
+
+/**
+ * efi_mem_reserve - Reserve an EFI memory region
+ * @addr: Physical address to reserve
+ * @size: Size of reservation
+ *
+ * Mark a region as reserved from general kernel allocation and
+ * prevent it being released by efi_free_boot_services().
+ *
+ * This function should be called drivers once they've parsed EFI
+ * configuration tables to figure out where their data lives, e.g.
+ * efi_esrt_init().
+ */
+void __init efi_mem_reserve(phys_addr_t addr, u64 size)
+{
+	/* efi_mem_reserve() does not work under Xen */
+	if (WARN_ON_ONCE(efi_enabled(EFI_PARAVIRT)))
+		return;
+
+	if (!memblock_is_region_reserved(addr, size))
+		memblock_reserve_kern(addr, size);
+	else
+		memblock_reserved_mark_kern(addr, size);
+
+	/*
+	 * Some architectures (x86) reserve all boot services ranges
+	 * until efi_free_boot_services() because of buggy firmware
+	 * implementations. This means the above memblock_reserve() is
+	 * superfluous on x86 and instead what it needs to do is
+	 * ensure the @start, @size is not freed.
+	 */
+	efi_arch_mem_reserve(addr, size);
+}
+
+static const efi_config_table_type_t common_tables[] __initconst = {
+	{ACPI_20_TABLE_GUID,			&efi.acpi20,		"ACPI 2.0"	},
+	{ACPI_TABLE_GUID,			&efi.acpi,		"ACPI"		},
+	{SMBIOS_TABLE_GUID,			&efi.smbios,		"SMBIOS"	},
+	{SMBIOS3_TABLE_GUID,			&efi.smbios3,		"SMBIOS 3.0"	},
+	{EFI_SYSTEM_RESOURCE_TABLE_GUID,	&efi.esrt,		"ESRT"		},
+	{EFI_MEMORY_ATTRIBUTES_TABLE_GUID,	&efi_mem_attr_table,	"MEMATTR"	},
+	{LINUX_EFI_RANDOM_SEED_TABLE_GUID,	&efi_rng_seed,		"RNG"		},
+	{LINUX_EFI_TPM_EVENT_LOG_GUID,		&efi.tpm_log,		"TPMEventLog"	},
+	{EFI_TCG2_FINAL_EVENTS_TABLE_GUID,	&efi.tpm_final_log,	"TPMFinalLog"	},
+	{EFI_CC_FINAL_EVENTS_TABLE_GUID,	&efi.tpm_final_log,	"CCFinalLog"	},
+	{LINUX_EFI_MEMRESERVE_TABLE_GUID,	&mem_reserve,		"MEMRESERVE"	},
+	{LINUX_EFI_INITRD_MEDIA_GUID,		&initrd,		"INITRD"	},
+	{EFI_RT_PROPERTIES_TABLE_GUID,		&rt_prop,		"RTPROP"	},
+#ifdef CONFIG_OVMF_DEBUG_LOG
+	{OVMF_MEMORY_LOG_TABLE_GUID,		&efi.ovmf_debug_log,	"OvmfDebugLog"	},
+#endif
+#ifdef CONFIG_EFI_RCI2_TABLE
+	{DELLEMC_EFI_RCI2_TABLE_GUID,		&rci2_table_phys			},
+#endif
+#ifdef CONFIG_LOAD_UEFI_KEYS
+	{LINUX_EFI_MOK_VARIABLE_TABLE_GUID,	&efi.mokvar_table,	"MOKvar"	},
+#endif
+#ifdef CONFIG_EFI_COCO_SECRET
+	{LINUX_EFI_COCO_SECRET_AREA_GUID,	&efi.coco_secret,	"CocoSecret"	},
+#endif
+#ifdef CONFIG_UNACCEPTED_MEMORY
+	{LINUX_EFI_UNACCEPTED_MEM_TABLE_GUID,	&efi.unaccepted,	"Unaccepted"	},
+#endif
+#ifdef CONFIG_EFI_GENERIC_STUB
+	{LINUX_EFI_PRIMARY_DISPLAY_TABLE_GUID,	&primary_display_table			},
+#endif
+	{},
+};
+
+static __init int match_config_table(const efi_guid_t *guid,
+				     unsigned long table,
+				     const efi_config_table_type_t *table_types)
+{
+	int i;
+
+	for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
+		if (efi_guidcmp(*guid, table_types[i].guid))
+			continue;
+
+		if (!efi_config_table_is_usable(guid, table)) {
+			if (table_types[i].name[0])
+				pr_cont("(%s=0x%lx unusable) ",
+					table_types[i].name, table);
+			return 1;
+		}
+
+		*(table_types[i].ptr) = table;
+		if (table_types[i].name[0])
+			pr_cont("%s=0x%lx ", table_types[i].name, table);
+		return 1;
+	}
+
+	return 0;
+}
+
+/**
+ * reserve_unaccepted - Map and reserve unaccepted configuration table
+ * @unaccepted: Pointer to unaccepted memory table
+ *
+ * memblock_add() makes sure that the table is mapped in direct mapping. During
+ * normal boot it happens automatically because the table is allocated from
+ * usable memory. But during crashkernel boot only memory specifically reserved
+ * for crash scenario is mapped. memblock_add() forces the table to be mapped
+ * in crashkernel case.
+ *
+ * Align the range to the nearest page borders. Ranges smaller than page size
+ * are not going to be mapped.
+ *
+ * memblock_reserve() makes sure that future allocations will not touch the
+ * table.
+ */
+
+static __init void reserve_unaccepted(struct efi_unaccepted_memory *unaccepted)
+{
+	phys_addr_t start, end;
+
+	start = PAGE_ALIGN_DOWN(efi.unaccepted);
+	end = PAGE_ALIGN(efi.unaccepted + sizeof(*unaccepted) + unaccepted->size);
+
+	memblock_add(start, end - start);
+	memblock_reserve(start, end - start);
+}
+
+int __init efi_config_parse_tables(const efi_config_table_t *config_tables,
+				   int count,
+				   const efi_config_table_type_t *arch_tables)
+{
+	const efi_config_table_64_t *tbl64 = (void *)config_tables;
+	const efi_config_table_32_t *tbl32 = (void *)config_tables;
+	const efi_guid_t *guid;
+	unsigned long table;
+	int i;
+
+	pr_info("");
+	for (i = 0; i < count; i++) {
+		if (!IS_ENABLED(CONFIG_X86)) {
+			guid = &config_tables[i].guid;
+			table = (unsigned long)config_tables[i].table;
+		} else if (efi_enabled(EFI_64BIT)) {
+			guid = &tbl64[i].guid;
+			table = tbl64[i].table;
+
+			if (IS_ENABLED(CONFIG_X86_32) &&
+			    tbl64[i].table > U32_MAX) {
+				pr_cont("\n");
+				pr_err("Table located above 4GB, disabling EFI.\n");
+				return -EINVAL;
+			}
+		} else {
+			guid = &tbl32[i].guid;
+			table = tbl32[i].table;
+		}
+
+		if (!match_config_table(guid, table, common_tables) && arch_tables)
+			match_config_table(guid, table, arch_tables);
+	}
+	pr_cont("\n");
+	set_bit(EFI_CONFIG_TABLES, &efi.flags);
+
+	if (efi_rng_seed != EFI_INVALID_TABLE_ADDR) {
+		struct linux_efi_random_seed *seed;
+		u32 size = 0;
+
+		seed = early_memremap(efi_rng_seed, sizeof(*seed));
+		if (seed != NULL) {
+			size = min_t(u32, seed->size, SZ_1K); // sanity check
+			early_memunmap(seed, sizeof(*seed));
+		} else {
+			pr_err("Could not map UEFI random seed!\n");
+		}
+		if (size > 0) {
+			seed = early_memremap(efi_rng_seed,
+					      sizeof(*seed) + size);
+			if (seed != NULL) {
+				add_bootloader_randomness(seed->bits, size);
+				memzero_explicit(seed->bits, size);
+				early_memunmap(seed, sizeof(*seed) + size);
+			} else {
+				pr_err("Could not map UEFI random seed!\n");
+			}
+		}
+	}
+
+	if (!IS_ENABLED(CONFIG_X86_32) && efi_enabled(EFI_MEMMAP))
+		efi_memattr_init();
+
+	efi_tpm_eventlog_init();
+
+	if (mem_reserve != EFI_INVALID_TABLE_ADDR) {
+		unsigned long prsv = mem_reserve;
+
+		while (prsv) {
+			struct linux_efi_memreserve *rsv;
+			u8 *p;
+
+			/*
+			 * Just map a full page: that is what we will get
+			 * anyway, and it permits us to map the entire entry
+			 * before knowing its size.
+			 */
+			p = early_memremap(ALIGN_DOWN(prsv, PAGE_SIZE),
+					   PAGE_SIZE);
+			if (p == NULL) {
+				pr_err("Could not map UEFI memreserve entry!\n");
+				return -ENOMEM;
+			}
+
+			rsv = (void *)(p + prsv % PAGE_SIZE);
+
+			/* reserve the entry itself */
+			memblock_reserve(prsv,
+					 struct_size(rsv, entry, rsv->size));
+
+			for (i = 0; i < atomic_read(&rsv->count); i++) {
+				memblock_reserve(rsv->entry[i].base,
+						 rsv->entry[i].size);
+			}
+
+			prsv = rsv->next;
+			early_memunmap(p, PAGE_SIZE);
+		}
+	}
+
+	if (rt_prop != EFI_INVALID_TABLE_ADDR) {
+		efi_rt_properties_table_t *tbl;
+
+		tbl = early_memremap(rt_prop, sizeof(*tbl));
+		if (tbl) {
+			efi.runtime_supported_mask &= tbl->runtime_services_supported;
+			early_memunmap(tbl, sizeof(*tbl));
+		}
+	}
+
+	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) &&
+	    initrd != EFI_INVALID_TABLE_ADDR && phys_initrd_size == 0) {
+		struct linux_efi_initrd *tbl;
+
+		tbl = early_memremap(initrd, sizeof(*tbl));
+		if (tbl) {
+			phys_initrd_start = tbl->base;
+			phys_initrd_size = tbl->size;
+			tbl->base = tbl->size = 0;
+			early_memunmap(tbl, sizeof(*tbl));
+		}
+	}
+
+	if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY) &&
+	    efi.unaccepted != EFI_INVALID_TABLE_ADDR) {
+		struct efi_unaccepted_memory *unaccepted;
+
+		unaccepted = early_memremap(efi.unaccepted, sizeof(*unaccepted));
+		if (unaccepted) {
+
+			if (unaccepted->version == 1) {
+				reserve_unaccepted(unaccepted);
+			} else {
+				efi.unaccepted = EFI_INVALID_TABLE_ADDR;
+			}
+
+			early_memunmap(unaccepted, sizeof(*unaccepted));
+		}
+	}
+
+	return 0;
+}
+
+int __init efi_systab_check_header(const efi_table_hdr_t *systab_hdr)
+{
+	if (systab_hdr->signature != EFI_SYSTEM_TABLE_SIGNATURE) {
+		pr_err("System table signature incorrect!\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const efi_char16_t *__init map_fw_vendor(unsigned long fw_vendor,
+						size_t size)
+{
+	const efi_char16_t *ret;
+
+	ret = early_memremap_ro(fw_vendor, size);
+	if (!ret)
+		pr_err("Could not map the firmware vendor!\n");
+	return ret;
+}
+
+static void __init unmap_fw_vendor(const void *fw_vendor, size_t size)
+{
+	early_memunmap((void *)fw_vendor, size);
+}
+
+void __init efi_systab_report_header(const efi_table_hdr_t *systab_hdr,
+				     unsigned long fw_vendor)
+{
+	char vendor[100] = "unknown";
+	const efi_char16_t *c16;
+	size_t i;
+	u16 rev;
+
+	c16 = map_fw_vendor(fw_vendor, sizeof(vendor) * sizeof(efi_char16_t));
+	if (c16) {
+		for (i = 0; i < sizeof(vendor) - 1 && c16[i]; ++i)
+			vendor[i] = c16[i];
+		vendor[i] = '\0';
+
+		unmap_fw_vendor(c16, sizeof(vendor) * sizeof(efi_char16_t));
+	}
+
+	rev = (u16)systab_hdr->revision;
+	pr_info("EFI v%u.%u", systab_hdr->revision >> 16, rev / 10);
+
+	rev %= 10;
+	if (rev)
+		pr_cont(".%u", rev);
+
+	pr_cont(" by %s\n", vendor);
+
+	if (IS_ENABLED(CONFIG_X86_64) &&
+	    systab_hdr->revision > EFI_1_10_SYSTEM_TABLE_REVISION &&
+	    !strcmp(vendor, "Apple")) {
+		pr_info("Apple Mac detected, using EFI v1.10 runtime services only\n");
+		efi.runtime_version = EFI_1_10_SYSTEM_TABLE_REVISION;
+	}
+}
+
+static __initdata char memory_type_name[][13] = {
+	"Reserved",
+	"Loader Code",
+	"Loader Data",
+	"Boot Code",
+	"Boot Data",
+	"Runtime Code",
+	"Runtime Data",
+	"Conventional",
+	"Unusable",
+	"ACPI Reclaim",
+	"ACPI Mem NVS",
+	"MMIO",
+	"MMIO Port",
+	"PAL Code",
+	"Persistent",
+	"Unaccepted",
+};
+
+char * __init efi_md_typeattr_format(char *buf, size_t size,
+				     const efi_memory_desc_t *md)
+{
+	char *pos;
+	int type_len;
+	u64 attr;
+
+	pos = buf;
+	if (md->type >= ARRAY_SIZE(memory_type_name))
+		type_len = snprintf(pos, size, "[type=%u", md->type);
+	else
+		type_len = snprintf(pos, size, "[%-*s",
+				    (int)(sizeof(memory_type_name[0]) - 1),
+				    memory_type_name[md->type]);
+	if (type_len >= size)
+		return buf;
+
+	pos += type_len;
+	size -= type_len;
+
+	attr = md->attribute;
+	if (attr & ~(EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_WT |
+		     EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_RO |
+		     EFI_MEMORY_WP | EFI_MEMORY_RP | EFI_MEMORY_XP |
+		     EFI_MEMORY_NV | EFI_MEMORY_SP | EFI_MEMORY_CPU_CRYPTO |
+		     EFI_MEMORY_MORE_RELIABLE | EFI_MEMORY_HOT_PLUGGABLE |
+		     EFI_MEMORY_RUNTIME))
+		snprintf(pos, size, "|attr=0x%016llx]",
+			 (unsigned long long)attr);
+	else
+		snprintf(pos, size,
+			 "|%3s|%2s|%2s|%2s|%2s|%2s|%2s|%2s|%2s|%2s|%3s|%2s|%2s|%2s|%2s]",
+			 attr & EFI_MEMORY_RUNTIME		? "RUN" : "",
+			 attr & EFI_MEMORY_HOT_PLUGGABLE	? "HP"  : "",
+			 attr & EFI_MEMORY_MORE_RELIABLE	? "MR"  : "",
+			 attr & EFI_MEMORY_CPU_CRYPTO   	? "CC"  : "",
+			 attr & EFI_MEMORY_SP			? "SP"  : "",
+			 attr & EFI_MEMORY_NV			? "NV"  : "",
+			 attr & EFI_MEMORY_XP			? "XP"  : "",
+			 attr & EFI_MEMORY_RP			? "RP"  : "",
+			 attr & EFI_MEMORY_WP			? "WP"  : "",
+			 attr & EFI_MEMORY_RO			? "RO"  : "",
+			 attr & EFI_MEMORY_UCE			? "UCE" : "",
+			 attr & EFI_MEMORY_WB			? "WB"  : "",
+			 attr & EFI_MEMORY_WT			? "WT"  : "",
+			 attr & EFI_MEMORY_WC			? "WC"  : "",
+			 attr & EFI_MEMORY_UC			? "UC"  : "");
+	return buf;
+}
+
+/*
+ * efi_mem_attributes - lookup memmap attributes for physical address
+ * @phys_addr: the physical address to lookup
+ *
+ * Search in the EFI memory map for the region covering
+ * @phys_addr. Returns the EFI memory attributes if the region
+ * was found in the memory map, 0 otherwise.
+ */
+u64 efi_mem_attributes(unsigned long phys_addr)
+{
+	efi_memory_desc_t md;
+
+	if (efi_mem_desc_lookup(phys_addr, &md))
+		return 0;
+
+	return md.attribute;
+}
+
+/*
+ * efi_mem_type - lookup memmap type for physical address
+ * @phys_addr: the physical address to lookup
+ *
+ * Search in the EFI memory map for the region covering @phys_addr.
+ * Returns the EFI memory type if the region was found in the memory
+ * map, -EINVAL otherwise.
+ */
+int efi_mem_type(unsigned long phys_addr)
+{
+	efi_memory_desc_t md;
+
+	if (!efi_enabled(EFI_MEMMAP) && !efi_enabled(EFI_PARAVIRT))
+		return -ENOTSUPP;
+
+	if (efi_mem_desc_lookup(phys_addr, &md))
+		return -EINVAL;
+
+	return md.type;
+}
+
+int efi_status_to_err(efi_status_t status)
+{
+	int err;
+
+	switch (status) {
+	case EFI_SUCCESS:
+		err = 0;
+		break;
+	case EFI_INVALID_PARAMETER:
+		err = -EINVAL;
+		break;
+	case EFI_OUT_OF_RESOURCES:
+		err = -ENOSPC;
+		break;
+	case EFI_DEVICE_ERROR:
+		err = -EIO;
+		break;
+	case EFI_WRITE_PROTECTED:
+		err = -EROFS;
+		break;
+	case EFI_SECURITY_VIOLATION:
+		err = -EACCES;
+		break;
+	case EFI_NOT_FOUND:
+		err = -ENOENT;
+		break;
+	case EFI_ABORTED:
+		err = -EINTR;
+		break;
+	default:
+		err = -EINVAL;
+	}
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(efi_status_to_err);
+
+static DEFINE_SPINLOCK(efi_mem_reserve_persistent_lock);
+static struct linux_efi_memreserve *efi_memreserve_root __ro_after_init;
+
+static int __init efi_memreserve_map_root(void)
+{
+	if (mem_reserve == EFI_INVALID_TABLE_ADDR)
+		return -ENODEV;
+
+	efi_memreserve_root = memremap(mem_reserve,
+				       sizeof(*efi_memreserve_root),
+				       MEMREMAP_WB);
+	if (WARN_ON_ONCE(!efi_memreserve_root))
+		return -ENOMEM;
+	return 0;
+}
+
+static int efi_mem_reserve_iomem(phys_addr_t addr, u64 size)
+{
+	struct resource *res, *parent;
+	int ret;
+
+	res = kzalloc_obj(struct resource, GFP_ATOMIC);
+	if (!res)
+		return -ENOMEM;
+
+	res->name	= "reserved";
+	res->flags	= IORESOURCE_MEM;
+	res->start	= addr;
+	res->end	= addr + size - 1;
+
+	/* we expect a conflict with a 'System RAM' region */
+	parent = request_resource_conflict(&iomem_resource, res);
+	ret = parent ? request_resource(parent, res) : 0;
+
+	/*
+	 * Given that efi_mem_reserve_iomem() can be called at any
+	 * time, only call memblock_reserve() if the architecture
+	 * keeps the infrastructure around.
+	 */
+	if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK) && !ret)
+		memblock_reserve(addr, size);
+
+	return ret;
+}
+
+int __ref efi_mem_reserve_persistent(phys_addr_t addr, u64 size)
+{
+	struct linux_efi_memreserve *rsv;
+	unsigned long prsv;
+	int rc, index;
+
+	if (efi_memreserve_root == (void *)ULONG_MAX)
+		return -ENODEV;
+
+	if (!efi_memreserve_root) {
+		rc = efi_memreserve_map_root();
+		if (rc)
+			return rc;
+	}
+
+	/* first try to find a slot in an existing linked list entry */
+	for (prsv = efi_memreserve_root->next; prsv; ) {
+		rsv = memremap(prsv, sizeof(*rsv), MEMREMAP_WB);
+		if (!rsv)
+			return -ENOMEM;
+		index = atomic_fetch_add_unless(&rsv->count, 1, rsv->size);
+		if (index < rsv->size) {
+			rsv->entry[index].base = addr;
+			rsv->entry[index].size = size;
+
+			memunmap(rsv);
+			return efi_mem_reserve_iomem(addr, size);
+		}
+		prsv = rsv->next;
+		memunmap(rsv);
+	}
+
+	/* no slot found - allocate a new linked list entry */
+	rsv = (struct linux_efi_memreserve *)__get_free_page(GFP_ATOMIC);
+	if (!rsv)
+		return -ENOMEM;
+
+	rc = efi_mem_reserve_iomem(__pa(rsv), SZ_4K);
+	if (rc) {
+		free_page((unsigned long)rsv);
+		return rc;
+	}
+
+	/*
+	 * The memremap() call above assumes that a linux_efi_memreserve entry
+	 * never crosses a page boundary, so let's ensure that this remains true
+	 * even when kexec'ing a 4k pages kernel from a >4k pages kernel, by
+	 * using SZ_4K explicitly in the size calculation below.
+	 */
+	rsv->size = EFI_MEMRESERVE_COUNT(SZ_4K);
+	atomic_set(&rsv->count, 1);
+	rsv->entry[0].base = addr;
+	rsv->entry[0].size = size;
+
+	spin_lock(&efi_mem_reserve_persistent_lock);
+	rsv->next = efi_memreserve_root->next;
+	efi_memreserve_root->next = __pa(rsv);
+	spin_unlock(&efi_mem_reserve_persistent_lock);
+
+	return efi_mem_reserve_iomem(addr, size);
+}
+
+static int __init efi_memreserve_root_init(void)
+{
+	if (efi_memreserve_root)
+		return 0;
+	if (efi_memreserve_map_root())
+		efi_memreserve_root = (void *)ULONG_MAX;
+	return 0;
+}
+early_initcall(efi_memreserve_root_init);
+
+#ifdef CONFIG_KEXEC
+static int update_efi_random_seed(struct notifier_block *nb,
+				  unsigned long code, void *unused)
+{
+	struct linux_efi_random_seed *seed;
+	u32 size = 0;
+
+	if (!kexec_in_progress)
+		return NOTIFY_DONE;
+
+	seed = memremap(efi_rng_seed, sizeof(*seed), MEMREMAP_WB);
+	if (seed != NULL) {
+		size = min(seed->size, EFI_RANDOM_SEED_SIZE);
+		memunmap(seed);
+	} else {
+		pr_err("Could not map UEFI random seed!\n");
+	}
+	if (size > 0) {
+		seed = memremap(efi_rng_seed, sizeof(*seed) + size,
+				MEMREMAP_WB);
+		if (seed != NULL) {
+			seed->size = size;
+			get_random_bytes(seed->bits, seed->size);
+			memunmap(seed);
+		} else {
+			pr_err("Could not map UEFI random seed!\n");
+		}
+	}
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block efi_random_seed_nb = {
+	.notifier_call = update_efi_random_seed,
+};
+
+static int __init register_update_efi_random_seed(void)
+{
+	if (efi_rng_seed == EFI_INVALID_TABLE_ADDR)
+		return 0;
+	return register_reboot_notifier(&efi_random_seed_nb);
+}
+late_initcall(register_update_efi_random_seed);
+#endif