Merge tag 's390-4.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Martin Schwidefsky:

 - Improved access control for the zcrypt driver, multiple device nodes
   can now be created with different access control lists

 - Extend the pkey API to provide random protected keys, this is useful
   for encrypted swap device with ephemeral protected keys

 - Add support for virtually mapped kernel stacks

 - Rework the early boot code, this moves the memory detection into the
   boot code that runs prior to decompression.

 - Add KASAN support

 - Bug fixes and cleanups

* tag 's390-4.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (83 commits)
  s390/pkey: move pckmo subfunction available checks away from module init
  s390/kasan: support preemptible kernel build
  s390/pkey: Load pkey kernel module automatically
  s390/perf: Return error when debug_register fails
  s390/sthyi: Fix machine name validity indication
  s390/zcrypt: fix broken zcrypt_send_cprb in-kernel api function
  s390/vmalloc: fix VMALLOC_START calculation
  s390/mem_detect: add missing include
  s390/dumpstack: print psw mask and address again
  s390/crypto: Enhance paes cipher to accept variable length key material
  s390/pkey: Introduce new API for transforming key blobs
  s390/pkey: Introduce new API for random protected key verification
  s390/pkey: Add sysfs attributes to emit secure key blobs
  s390/pkey: Add sysfs attributes to emit protected key blobs
  s390/pkey: Define protected key blob format
  s390/pkey: Introduce new API for random protected key generation
  s390/zcrypt: add ap_adapter_mask sysfs attribute
  s390/zcrypt: provide apfs failure code on type 86 error reply
  s390/zcrypt: zcrypt device driver cleanup
  s390/kasan: add support for mem= kernel parameter
  ...

84 files changed, 2131 insertions, 739 deletions

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 9a9c7a6fe925..cc8313550493 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -56,6 +56,12 @@ config PCI_QUIRKS
 config ARCH_SUPPORTS_UPROBES
 	def_bool y
 
+config KASAN_SHADOW_OFFSET
+	hex
+	depends on KASAN
+	default 0x18000000000000 if KASAN_S390_4_LEVEL_PAGING
+	default 0x30000000000
+
 config S390
 	def_bool y
 	select ARCH_BINFMT_ELF_STATE
@@ -120,11 +126,13 @@ config S390
 	select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_ARCH_JUMP_LABEL
+	select HAVE_ARCH_KASAN
 	select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
 	select HAVE_ARCH_SECCOMP_FILTER
 	select HAVE_ARCH_SOFT_DIRTY
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
+	select HAVE_ARCH_VMAP_STACK
 	select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 	select HAVE_CMPXCHG_DOUBLE
 	select HAVE_CMPXCHG_LOCAL
@@ -649,6 +657,7 @@ config PACK_STACK
 
 config CHECK_STACK
 	def_bool y
+	depends on !VMAP_STACK
 	prompt "Detect kernel stack overflow"
 	help
 	  This option enables the compiler option -mstack-guard and
diff --git a/arch/s390/Makefile b/arch/s390/Makefile
index ee65185bbc80..0b33577932c3 100644
--- a/arch/s390/Makefile
+++ b/arch/s390/Makefile
@@ -27,7 +27,7 @@ KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-option,-ffreestanding)
 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
 KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
 UTS_MACHINE	:= s390x
-STACK_SIZE	:= 16384
+STACK_SIZE	:= $(if $(CONFIG_KASAN),32768,16384)
 CHECKFLAGS	+= -D__s390__ -D__s390x__
 
 export LD_BFD
diff --git a/arch/s390/appldata/appldata_base.c b/arch/s390/appldata/appldata_base.c
index 9bf8489df6e6..e4b58240ec53 100644
--- a/arch/s390/appldata/appldata_base.c
+++ b/arch/s390/appldata/appldata_base.c
@@ -137,6 +137,14 @@ static void appldata_work_fn(struct work_struct *work)
 	mutex_unlock(&appldata_ops_mutex);
 }
 
+static struct appldata_product_id appldata_id = {
+	.prod_nr    = {0xD3, 0xC9, 0xD5, 0xE4,
+		       0xE7, 0xD2, 0xD9},	/* "LINUXKR" */
+	.prod_fn    = 0xD5D3,			/* "NL" */
+	.version_nr = 0xF2F6,			/* "26" */
+	.release_nr = 0xF0F1,			/* "01" */
+};
+
 /*
  * appldata_diag()
  *
@@ -145,17 +153,22 @@ static void appldata_work_fn(struct work_struct *work)
 int appldata_diag(char record_nr, u16 function, unsigned long buffer,
 			u16 length, char *mod_lvl)
 {
-	struct appldata_product_id id = {
-		.prod_nr    = {0xD3, 0xC9, 0xD5, 0xE4,
-			       0xE7, 0xD2, 0xD9},	/* "LINUXKR" */
-		.prod_fn    = 0xD5D3,			/* "NL" */
-		.version_nr = 0xF2F6,			/* "26" */
-		.release_nr = 0xF0F1,			/* "01" */
-	};
+	struct appldata_parameter_list *parm_list;
+	struct appldata_product_id *id;
+	int rc;
 
-	id.record_nr = record_nr;
-	id.mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];
-	return appldata_asm(&id, function, (void *) buffer, length);
+	parm_list = kmalloc(sizeof(*parm_list), GFP_KERNEL);
+	id = kmemdup(&appldata_id, sizeof(appldata_id), GFP_KERNEL);
+	rc = -ENOMEM;
+	if (parm_list && id) {
+		id->record_nr = record_nr;
+		id->mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];
+		rc = appldata_asm(parm_list, id, function,
+				  (void *) buffer, length);
+	}
+	kfree(id);
+	kfree(parm_list);
+	return rc;
 }
 /************************ timer, work, DIAG <END> ****************************/
 
diff --git a/arch/s390/boot/.gitignore b/arch/s390/boot/.gitignore
index 017d5912ad2d..16ff906e4610 100644
--- a/arch/s390/boot/.gitignore
+++ b/arch/s390/boot/.gitignore
@@ -1,2 +1,3 @@
 image
 bzImage
+section_cmp.*
diff --git a/arch/s390/boot/Makefile b/arch/s390/boot/Makefile
index 9e6668ee93de..d5ad724f5c96 100644
--- a/arch/s390/boot/Makefile
+++ b/arch/s390/boot/Makefile
@@ -6,6 +6,7 @@
 KCOV_INSTRUMENT := n
 GCOV_PROFILE := n
 UBSAN_SANITIZE := n
+KASAN_SANITIZE := n
 
 KBUILD_AFLAGS := $(KBUILD_AFLAGS_DECOMPRESSOR)
 KBUILD_CFLAGS := $(KBUILD_CFLAGS_DECOMPRESSOR)
@@ -27,15 +28,32 @@ endif
 
 CFLAGS_sclp_early_core.o += -I$(srctree)/drivers/s390/char
 
-obj-y	:= head.o als.o ebcdic.o sclp_early_core.o mem.o
-targets	:= bzImage startup.a $(obj-y)
+obj-y	:= head.o als.o startup.o mem_detect.o ipl_parm.o string.o ebcdic.o
+obj-y	+= sclp_early_core.o mem.o ipl_vmparm.o cmdline.o ctype.o
+targets	:= bzImage startup.a section_cmp.boot.data $(obj-y)
 subdir-	:= compressed
 
 OBJECTS := $(addprefix $(obj)/,$(obj-y))
 
-$(obj)/bzImage: $(obj)/compressed/vmlinux FORCE
+quiet_cmd_section_cmp = SECTCMP $*
+define cmd_section_cmp
+	s1=`$(OBJDUMP) -t -j "$*" "$<" | sort | \
+		sed -n "/0000000000000000/! s/.*\s$*\s\+//p" | sha256sum`; \
+	s2=`$(OBJDUMP) -t -j "$*" "$(word 2,$^)" | sort | \
+		sed -n "/0000000000000000/! s/.*\s$*\s\+//p" | sha256sum`; \
+	if [ "$$s1" != "$$s2" ]; then \
+		echo "error: section $* differs between $< and $(word 2,$^)" >&2; \
+		exit 1; \
+	fi; \
+	touch $@
+endef
+
+$(obj)/bzImage: $(obj)/compressed/vmlinux $(obj)/section_cmp.boot.data FORCE
 	$(call if_changed,objcopy)
 
+$(obj)/section_cmp%: vmlinux $(obj)/compressed/vmlinux FORCE
+	$(call if_changed,section_cmp)
+
 $(obj)/compressed/vmlinux: $(obj)/startup.a FORCE
 	$(Q)$(MAKE) $(build)=$(obj)/compressed $@
 
diff --git a/arch/s390/boot/boot.h b/arch/s390/boot/boot.h
new file mode 100644
index 000000000000..fc41e2277ea8
--- /dev/null
+++ b/arch/s390/boot/boot.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef BOOT_BOOT_H
+#define BOOT_BOOT_H
+
+void startup_kernel(void);
+void detect_memory(void);
+void store_ipl_parmblock(void);
+void setup_boot_command_line(void);
+void setup_memory_end(void);
+
+#endif /* BOOT_BOOT_H */
diff --git a/arch/s390/boot/cmdline.c b/arch/s390/boot/cmdline.c
new file mode 100644
index 000000000000..73d826cdbdeb
--- /dev/null
+++ b/arch/s390/boot/cmdline.c
@@ -0,0 +1,2 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "../../../lib/cmdline.c"
diff --git a/arch/s390/boot/compressed/Makefile b/arch/s390/boot/compressed/Makefile
index 04609478d18b..593039620487 100644
--- a/arch/s390/boot/compressed/Makefile
+++ b/arch/s390/boot/compressed/Makefile
@@ -8,14 +8,16 @@
 KCOV_INSTRUMENT := n
 GCOV_PROFILE := n
 UBSAN_SANITIZE := n
+KASAN_SANITIZE := n
 
-obj-y	:= $(if $(CONFIG_KERNEL_UNCOMPRESSED),,head.o misc.o) piggy.o
+obj-y	:= $(if $(CONFIG_KERNEL_UNCOMPRESSED),,decompressor.o) piggy.o info.o
 targets	:= vmlinux.lds vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2
 targets += vmlinux.bin.xz vmlinux.bin.lzma vmlinux.bin.lzo vmlinux.bin.lz4
-targets += vmlinux.scr.lds $(obj-y) $(if $(CONFIG_KERNEL_UNCOMPRESSED),,sizes.h)
+targets += info.bin $(obj-y)
 
 KBUILD_AFLAGS := $(KBUILD_AFLAGS_DECOMPRESSOR)
 KBUILD_CFLAGS := $(KBUILD_CFLAGS_DECOMPRESSOR)
+OBJCOPYFLAGS :=
 
 OBJECTS := $(addprefix $(obj)/,$(obj-y))
 
@@ -23,23 +25,16 @@ LDFLAGS_vmlinux := --oformat $(LD_BFD) -e startup -T
 $(obj)/vmlinux: $(obj)/vmlinux.lds $(objtree)/arch/s390/boot/startup.a $(OBJECTS)
 	$(call if_changed,ld)
 
-# extract required uncompressed vmlinux symbols and adjust them to reflect offsets inside vmlinux.bin
-sed-sizes := -e 's/^\([0-9a-fA-F]*\) . \(__bss_start\|_end\)$$/\#define SZ\2 (0x\1 - 0x100000)/p'
-
-quiet_cmd_sizes = GEN     $@
-      cmd_sizes = $(NM) $< | sed -n $(sed-sizes) > $@
-
-$(obj)/sizes.h: vmlinux
-	$(call if_changed,sizes)
-
-AFLAGS_head.o += -I$(objtree)/$(obj)
-$(obj)/head.o: $(obj)/sizes.h
+OBJCOPYFLAGS_info.bin := -O binary --only-section=.vmlinux.info
+$(obj)/info.bin: vmlinux FORCE
+	$(call if_changed,objcopy)
 
-CFLAGS_misc.o += -I$(objtree)/$(obj)
-$(obj)/misc.o: $(obj)/sizes.h
+OBJCOPYFLAGS_info.o := -I binary -O elf64-s390 -B s390:64-bit --rename-section .data=.vmlinux.info
+$(obj)/info.o: $(obj)/info.bin FORCE
+	$(call if_changed,objcopy)
 
-OBJCOPYFLAGS_vmlinux.bin :=  -R .comment -S
-$(obj)/vmlinux.bin: vmlinux
+OBJCOPYFLAGS_vmlinux.bin := -O binary --remove-section=.comment --remove-section=.vmlinux.info -S
+$(obj)/vmlinux.bin: vmlinux FORCE
 	$(call if_changed,objcopy)
 
 vmlinux.bin.all-y := $(obj)/vmlinux.bin
@@ -64,10 +59,10 @@ $(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y)
 $(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y)
 	$(call if_changed,xzkern)
 
-LDFLAGS_piggy.o := -r --format binary --oformat $(LD_BFD) -T
-$(obj)/piggy.o: $(obj)/vmlinux.scr.lds $(obj)/vmlinux.bin$(suffix-y)
-	$(call if_changed,ld)
+OBJCOPYFLAGS_piggy.o := -I binary -O elf64-s390 -B s390:64-bit --rename-section .data=.vmlinux.bin.compressed
+$(obj)/piggy.o: $(obj)/vmlinux.bin$(suffix-y) FORCE
+	$(call if_changed,objcopy)
 
-chkbss := $(filter-out $(obj)/misc.o $(obj)/piggy.o,$(OBJECTS))
+chkbss := $(filter-out $(obj)/piggy.o $(obj)/info.o,$(OBJECTS))
 chkbss-target := $(obj)/vmlinux.bin
 include $(srctree)/arch/s390/scripts/Makefile.chkbss
diff --git a/arch/s390/boot/compressed/decompressor.c b/arch/s390/boot/compressed/decompressor.c
new file mode 100644
index 000000000000..45046630c56a
--- /dev/null
+++ b/arch/s390/boot/compressed/decompressor.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Definitions and wrapper functions for kernel decompressor
+ *
+ * Copyright IBM Corp. 2010
+ *
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <asm/page.h>
+#include "decompressor.h"
+
+/*
+ * gzip declarations
+ */
+#define STATIC static
+#define STATIC_RW_DATA static __section(.data)
+
+#undef memset
+#undef memcpy
+#undef memmove
+#define memmove memmove
+#define memzero(s, n) memset((s), 0, (n))
+
+/* Symbols defined by linker scripts */
+extern char _end[];
+extern unsigned char _compressed_start[];
+extern unsigned char _compressed_end[];
+
+#ifdef CONFIG_HAVE_KERNEL_BZIP2
+#define HEAP_SIZE	0x400000
+#else
+#define HEAP_SIZE	0x10000
+#endif
+
+static unsigned long free_mem_ptr = (unsigned long) _end;
+static unsigned long free_mem_end_ptr = (unsigned long) _end + HEAP_SIZE;
+
+#ifdef CONFIG_KERNEL_GZIP
+#include "../../../../lib/decompress_inflate.c"
+#endif
+
+#ifdef CONFIG_KERNEL_BZIP2
+#include "../../../../lib/decompress_bunzip2.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZ4
+#include "../../../../lib/decompress_unlz4.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZMA
+#include "../../../../lib/decompress_unlzma.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZO
+#include "../../../../lib/decompress_unlzo.c"
+#endif
+
+#ifdef CONFIG_KERNEL_XZ
+#include "../../../../lib/decompress_unxz.c"
+#endif
+
+#define decompress_offset ALIGN((unsigned long)_end + HEAP_SIZE, PAGE_SIZE)
+
+unsigned long mem_safe_offset(void)
+{
+	/*
+	 * due to 4MB HEAD_SIZE for bzip2
+	 * 'decompress_offset + vmlinux.image_size' could be larger than
+	 * kernel at final position + its .bss, so take the larger of two
+	 */
+	return max(decompress_offset + vmlinux.image_size,
+		   vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size);
+}
+
+void *decompress_kernel(void)
+{
+	void *output = (void *)decompress_offset;
+
+	__decompress(_compressed_start, _compressed_end - _compressed_start,
+		     NULL, NULL, output, 0, NULL, error);
+	return output;
+}
diff --git a/arch/s390/boot/compressed/decompressor.h b/arch/s390/boot/compressed/decompressor.h
new file mode 100644
index 000000000000..e1c1f2ec60f4
--- /dev/null
+++ b/arch/s390/boot/compressed/decompressor.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef BOOT_COMPRESSED_DECOMPRESSOR_H
+#define BOOT_COMPRESSED_DECOMPRESSOR_H
+
+#ifdef CONFIG_KERNEL_UNCOMPRESSED
+static inline void *decompress_kernel(void) {}
+#else
+void *decompress_kernel(void);
+#endif
+unsigned long mem_safe_offset(void);
+void error(char *m);
+
+struct vmlinux_info {
+	unsigned long default_lma;
+	void (*entry)(void);
+	unsigned long image_size;	/* does not include .bss */
+	unsigned long bss_size;		/* uncompressed image .bss size */
+	unsigned long bootdata_off;
+	unsigned long bootdata_size;
+};
+
+extern char _vmlinux_info[];
+#define vmlinux (*(struct vmlinux_info *)_vmlinux_info)
+
+#endif /* BOOT_COMPRESSED_DECOMPRESSOR_H */
diff --git a/arch/s390/boot/compressed/head.S b/arch/s390/boot/compressed/head.S
deleted file mode 100644
index df8dbbc17bcc..000000000000
--- a/arch/s390/boot/compressed/head.S
+++ /dev/null
@@ -1,52 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Startup glue code to uncompress the kernel
- *
- * Copyright IBM Corp. 2010
- *
- *   Author(s):	Martin Schwidefsky <schwidefsky@de.ibm.com>
- */
-
-#include <linux/init.h>
-#include <linux/linkage.h>
-#include <asm/asm-offsets.h>
-#include <asm/thread_info.h>
-#include <asm/page.h>
-#include "sizes.h"
-
-__HEAD
-ENTRY(startup_decompressor)
-	basr	%r13,0			# get base
-.LPG1:
-	# setup stack
-	lg	%r15,.Lstack-.LPG1(%r13)
-	aghi	%r15,-160
-	brasl	%r14,decompress_kernel
-	# Set up registers for memory mover. We move the decompressed image to
-	# 0x100000, where startup_continue of the decompressed image is supposed
-	# to be.
-	lgr	%r4,%r2
-	lg	%r2,.Loffset-.LPG1(%r13)
-	lg	%r3,.Lmvsize-.LPG1(%r13)
-	lgr	%r5,%r3
-	# Move the memory mover someplace safe so it doesn't overwrite itself.
-	la	%r1,0x200
-	mvc	0(mover_end-mover,%r1),mover-.LPG1(%r13)
-	# When the memory mover is done we pass control to
-	# arch/s390/kernel/head64.S:startup_continue which lives at 0x100000 in
-	# the decompressed image.
-	lgr	%r6,%r2
-	br	%r1
-mover:
-	mvcle	%r2,%r4,0
-	jo	mover
-	br	%r6
-mover_end:
-
-	.align	8
-.Lstack:
-	.quad	0x8000 + (1<<(PAGE_SHIFT+THREAD_SIZE_ORDER))
-.Loffset:
-	.quad	0x100000
-.Lmvsize:
-	.quad	SZ__bss_start
diff --git a/arch/s390/boot/compressed/misc.c b/arch/s390/boot/compressed/misc.c
deleted file mode 100644
index f66ad73c205b..000000000000
--- a/arch/s390/boot/compressed/misc.c
+++ /dev/null
@@ -1,116 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Definitions and wrapper functions for kernel decompressor
- *
- * Copyright IBM Corp. 2010
- *
- * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
- */
-
-#include <linux/uaccess.h>
-#include <asm/page.h>
-#include <asm/sclp.h>
-#include <asm/ipl.h>
-#include "sizes.h"
-
-/*
- * gzip declarations
- */
-#define STATIC static
-
-#undef memset
-#undef memcpy
-#undef memmove
-#define memmove memmove
-#define memzero(s, n) memset((s), 0, (n))
-
-/* Symbols defined by linker scripts */
-extern char input_data[];
-extern int input_len;
-extern char _end[];
-extern char _bss[], _ebss[];
-
-static void error(char *m);
-
-static unsigned long free_mem_ptr;
-static unsigned long free_mem_end_ptr;
-
-#ifdef CONFIG_HAVE_KERNEL_BZIP2
-#define HEAP_SIZE	0x400000
-#else
-#define HEAP_SIZE	0x10000
-#endif
-
-#ifdef CONFIG_KERNEL_GZIP
-#include "../../../../lib/decompress_inflate.c"
-#endif
-
-#ifdef CONFIG_KERNEL_BZIP2
-#include "../../../../lib/decompress_bunzip2.c"
-#endif
-
-#ifdef CONFIG_KERNEL_LZ4
-#include "../../../../lib/decompress_unlz4.c"
-#endif
-
-#ifdef CONFIG_KERNEL_LZMA
-#include "../../../../lib/decompress_unlzma.c"
-#endif
-
-#ifdef CONFIG_KERNEL_LZO
-#include "../../../../lib/decompress_unlzo.c"
-#endif
-
-#ifdef CONFIG_KERNEL_XZ
-#include "../../../../lib/decompress_unxz.c"
-#endif
-
-static int puts(const char *s)
-{
-	sclp_early_printk(s);
-	return 0;
-}
-
-static void error(char *x)
-{
-	unsigned long long psw = 0x000a0000deadbeefULL;
-
-	puts("\n\n");
-	puts(x);
-	puts("\n\n -- System halted");
-
-	asm volatile("lpsw %0" : : "Q" (psw));
-}
-
-unsigned long decompress_kernel(void)
-{
-	void *output, *kernel_end;
-
-	output = (void *) ALIGN((unsigned long) _end + HEAP_SIZE, PAGE_SIZE);
-	kernel_end = output + SZ__bss_start;
-
-#ifdef CONFIG_BLK_DEV_INITRD
-	/*
-	 * Move the initrd right behind the end of the decompressed
-	 * kernel image. This also prevents initrd corruption caused by
-	 * bss clearing since kernel_end will always be located behind the
-	 * current bss section..
-	 */
-	if (INITRD_START && INITRD_SIZE && kernel_end > (void *) INITRD_START) {
-		memmove(kernel_end, (void *) INITRD_START, INITRD_SIZE);
-		INITRD_START = (unsigned long) kernel_end;
-	}
-#endif
-
-	/*
-	 * Clear bss section. free_mem_ptr and free_mem_end_ptr need to be
-	 * initialized afterwards since they reside in bss.
-	 */
-	memset(_bss, 0, _ebss - _bss);
-	free_mem_ptr = (unsigned long) _end;
-	free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
-
-	__decompress(input_data, input_len, NULL, NULL, output, 0, NULL, error);
-	return (unsigned long) output;
-}
-
diff --git a/arch/s390/boot/compressed/vmlinux.lds.S b/arch/s390/boot/compressed/vmlinux.lds.S
index b16ac8b3c439..7efc3938f595 100644
--- a/arch/s390/boot/compressed/vmlinux.lds.S
+++ b/arch/s390/boot/compressed/vmlinux.lds.S
@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #include <asm-generic/vmlinux.lds.h>
+#include <asm/vmlinux.lds.h>
 
 OUTPUT_FORMAT("elf64-s390", "elf64-s390", "elf64-s390")
 OUTPUT_ARCH(s390:64-bit)
@@ -8,9 +9,6 @@ ENTRY(startup)
 
 SECTIONS
 {
-	/* Be careful parts of head_64.S assume startup_32 is at
-	 * address 0.
-	 */
 	. = 0;
 	.head.text : {
 		_head = . ;
@@ -26,7 +24,7 @@ SECTIONS
 	.rodata : {
 		_rodata = . ;
 		*(.rodata)	 /* read-only data */
-		*(EXCLUDE_FILE (*piggy.o) .rodata.compressed)
+		*(.rodata.*)
 		_erodata = . ;
 	}
 	.data :	{
@@ -35,14 +33,28 @@ SECTIONS
 		*(.data.*)
 		_edata = . ;
 	}
-	startup_continue = 0x100000;
+	BOOT_DATA
+
+	/*
+	 * uncompressed image info used by the decompressor it should match
+	 * struct vmlinux_info. It comes from .vmlinux.info section of
+	 * uncompressed vmlinux in a form of info.o
+	 */
+	. = ALIGN(8);
+	.vmlinux.info : {
+		_vmlinux_info = .;
+		*(.vmlinux.info)
+	}
+
 #ifdef CONFIG_KERNEL_UNCOMPRESSED
 	. = 0x100000;
 #else
 	. = ALIGN(8);
 #endif
 	.rodata.compressed : {
-		*(.rodata.compressed)
+		_compressed_start = .;
+		*(.vmlinux.bin.compressed)
+		_compressed_end = .;
 	}
 	. = ALIGN(256);
 	.bss : {
diff --git a/arch/s390/boot/compressed/vmlinux.scr.lds.S b/arch/s390/boot/compressed/vmlinux.scr.lds.S
deleted file mode 100644
index ff01d18c9222..000000000000
--- a/arch/s390/boot/compressed/vmlinux.scr.lds.S
+++ /dev/null
@@ -1,15 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-SECTIONS
-{
-  .rodata.compressed : {
-#ifndef CONFIG_KERNEL_UNCOMPRESSED
-	input_len = .;
-	LONG(input_data_end - input_data) input_data = .;
-#endif
-	*(.data)
-#ifndef CONFIG_KERNEL_UNCOMPRESSED
-	output_len = . - 4;
-	input_data_end = .;
-#endif
-	}
-}
diff --git a/arch/s390/boot/ctype.c b/arch/s390/boot/ctype.c
new file mode 100644
index 000000000000..2495810b47e3
--- /dev/null
+++ b/arch/s390/boot/ctype.c
@@ -0,0 +1,2 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "../../../lib/ctype.c"
diff --git a/arch/s390/boot/head.S b/arch/s390/boot/head.S
index f721913b73f1..ce2cbbc41742 100644
--- a/arch/s390/boot/head.S
+++ b/arch/s390/boot/head.S
@@ -60,6 +60,9 @@ __HEAD
 	.long	0x02000690,0x60000050
 	.long	0x020006e0,0x20000050
 
+	.org	0x1a0
+	.quad	0,iplstart
+
 	.org	0x200
 
 #
@@ -308,16 +311,11 @@ ENTRY(startup_kdump)
 	spt	6f-.LPG0(%r13)
 	mvc	__LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13)
 	l	%r15,.Lstack-.LPG0(%r13)
-	ahi	%r15,-STACK_FRAME_OVERHEAD
 	brasl	%r14,verify_facilities
-#ifdef CONFIG_KERNEL_UNCOMPRESSED
-	jg	startup_continue
-#else
-	jg	startup_decompressor
-#endif
+	brasl	%r14,startup_kernel
 
 .Lstack:
-	.long	0x8000 + (1<<(PAGE_SHIFT+THREAD_SIZE_ORDER))
+	.long	0x8000 + (1<<(PAGE_SHIFT+BOOT_STACK_ORDER)) - STACK_FRAME_OVERHEAD
 	.align	8
 6:	.long	0x7fffffff,0xffffffff
 
diff --git a/arch/s390/boot/ipl_parm.c b/arch/s390/boot/ipl_parm.c
new file mode 100644
index 000000000000..9dab596be98e
--- /dev/null
+++ b/arch/s390/boot/ipl_parm.c
@@ -0,0 +1,182 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/init.h>
+#include <linux/ctype.h>
+#include <asm/ebcdic.h>
+#include <asm/sclp.h>
+#include <asm/sections.h>
+#include <asm/boot_data.h>
+#include "boot.h"
+
+char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
+struct ipl_parameter_block __bootdata(early_ipl_block);
+int __bootdata(early_ipl_block_valid);
+
+unsigned long __bootdata(memory_end);
+int __bootdata(memory_end_set);
+int __bootdata(noexec_disabled);
+
+static inline int __diag308(unsigned long subcode, void *addr)
+{
+	register unsigned long _addr asm("0") = (unsigned long)addr;
+	register unsigned long _rc asm("1") = 0;
+	unsigned long reg1, reg2;
+	psw_t old = S390_lowcore.program_new_psw;
+
+	asm volatile(
+		"	epsw	%0,%1\n"
+		"	st	%0,%[psw_pgm]\n"
+		"	st	%1,%[psw_pgm]+4\n"
+		"	larl	%0,1f\n"
+		"	stg	%0,%[psw_pgm]+8\n"
+		"	diag	%[addr],%[subcode],0x308\n"
+		"1:	nopr	%%r7\n"
+		: "=&d" (reg1), "=&a" (reg2),
+		  [psw_pgm] "=Q" (S390_lowcore.program_new_psw),
+		  [addr] "+d" (_addr), "+d" (_rc)
+		: [subcode] "d" (subcode)
+		: "cc", "memory");
+	S390_lowcore.program_new_psw = old;
+	return _rc;
+}
+
+void store_ipl_parmblock(void)
+{
+	int rc;
+
+	rc = __diag308(DIAG308_STORE, &early_ipl_block);
+	if (rc == DIAG308_RC_OK &&
+	    early_ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION)
+		early_ipl_block_valid = 1;
+}
+
+static size_t scpdata_length(const char *buf, size_t count)
+{
+	while (count) {
+		if (buf[count - 1] != '\0' && buf[count - 1] != ' ')
+			break;
+		count--;
+	}
+	return count;
+}
+
+static size_t ipl_block_get_ascii_scpdata(char *dest, size_t size,
+					  const struct ipl_parameter_block *ipb)
+{
+	size_t count;
+	size_t i;
+	int has_lowercase;
+
+	count = min(size - 1, scpdata_length(ipb->ipl_info.fcp.scp_data,
+					     ipb->ipl_info.fcp.scp_data_len));
+	if (!count)
+		goto out;
+
+	has_lowercase = 0;
+	for (i = 0; i < count; i++) {
+		if (!isascii(ipb->ipl_info.fcp.scp_data[i])) {
+			count = 0;
+			goto out;
+		}
+		if (!has_lowercase && islower(ipb->ipl_info.fcp.scp_data[i]))
+			has_lowercase = 1;
+	}
+
+	if (has_lowercase)
+		memcpy(dest, ipb->ipl_info.fcp.scp_data, count);
+	else
+		for (i = 0; i < count; i++)
+			dest[i] = tolower(ipb->ipl_info.fcp.scp_data[i]);
+out:
+	dest[count] = '\0';
+	return count;
+}
+
+static void append_ipl_block_parm(void)
+{
+	char *parm, *delim;
+	size_t len, rc = 0;
+
+	len = strlen(early_command_line);
+
+	delim = early_command_line + len;    /* '\0' character position */
+	parm = early_command_line + len + 1; /* append right after '\0' */
+
+	switch (early_ipl_block.hdr.pbt) {
+	case DIAG308_IPL_TYPE_CCW:
+		rc = ipl_block_get_ascii_vmparm(
+			parm, COMMAND_LINE_SIZE - len - 1, &early_ipl_block);
+		break;
+	case DIAG308_IPL_TYPE_FCP:
+		rc = ipl_block_get_ascii_scpdata(
+			parm, COMMAND_LINE_SIZE - len - 1, &early_ipl_block);
+		break;
+	}
+	if (rc) {
+		if (*parm == '=')
+			memmove(early_command_line, parm + 1, rc);
+		else
+			*delim = ' '; /* replace '\0' with space */
+	}
+}
+
+static inline int has_ebcdic_char(const char *str)
+{
+	int i;
+
+	for (i = 0; str[i]; i++)
+		if (str[i] & 0x80)
+			return 1;
+	return 0;
+}
+
+void setup_boot_command_line(void)
+{
+	COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
+	/* convert arch command line to ascii if necessary */
+	if (has_ebcdic_char(COMMAND_LINE))
+		EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
+	/* copy arch command line */
+	strcpy(early_command_line, strim(COMMAND_LINE));
+
+	/* append IPL PARM data to the boot command line */
+	if (early_ipl_block_valid)
+		append_ipl_block_parm();
+}
+
+static char command_line_buf[COMMAND_LINE_SIZE] __section(.data);
+static void parse_mem_opt(void)
+{
+	char *param, *val;
+	bool enabled;
+	char *args;
+	int rc;
+
+	args = strcpy(command_line_buf, early_command_line);
+	while (*args) {
+		args = next_arg(args, &param, &val);
+
+		if (!strcmp(param, "mem")) {
+			memory_end = memparse(val, NULL);
+			memory_end_set = 1;
+		}
+
+		if (!strcmp(param, "noexec")) {
+			rc = kstrtobool(val, &enabled);
+			if (!rc && !enabled)
+				noexec_disabled = 1;
+		}
+	}
+}
+
+void setup_memory_end(void)
+{
+	parse_mem_opt();
+#ifdef CONFIG_CRASH_DUMP
+	if (!OLDMEM_BASE && early_ipl_block_valid &&
+	    early_ipl_block.hdr.pbt == DIAG308_IPL_TYPE_FCP &&
+	    early_ipl_block.ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP) {
+		if (!sclp_early_get_hsa_size(&memory_end) && memory_end)
+			memory_end_set = 1;
+	}
+#endif
+}
diff --git a/arch/s390/boot/ipl_vmparm.c b/arch/s390/boot/ipl_vmparm.c
new file mode 100644
index 000000000000..8dacd5fadfd7
--- /dev/null
+++ b/arch/s390/boot/ipl_vmparm.c
@@ -0,0 +1,2 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "../kernel/ipl_vmparm.c"
diff --git a/arch/s390/boot/mem_detect.c b/arch/s390/boot/mem_detect.c
new file mode 100644
index 000000000000..4cb771ba13fa
--- /dev/null
+++ b/arch/s390/boot/mem_detect.c
@@ -0,0 +1,182 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <asm/sclp.h>
+#include <asm/sections.h>
+#include <asm/mem_detect.h>
+#include <asm/sparsemem.h>
+#include "compressed/decompressor.h"
+#include "boot.h"
+
+unsigned long __bootdata(max_physmem_end);
+struct mem_detect_info __bootdata(mem_detect);
+
+/* up to 256 storage elements, 1020 subincrements each */
+#define ENTRIES_EXTENDED_MAX						       \
+	(256 * (1020 / 2) * sizeof(struct mem_detect_block))
+
+/*
+ * To avoid corrupting old kernel memory during dump, find lowest memory
+ * chunk possible either right after the kernel end (decompressed kernel) or
+ * after initrd (if it is present and there is no hole between the kernel end
+ * and initrd)
+ */
+static void *mem_detect_alloc_extended(void)
+{
+	unsigned long offset = ALIGN(mem_safe_offset(), sizeof(u64));
+
+	if (IS_ENABLED(BLK_DEV_INITRD) && INITRD_START && INITRD_SIZE &&
+	    INITRD_START < offset + ENTRIES_EXTENDED_MAX)
+		offset = ALIGN(INITRD_START + INITRD_SIZE, sizeof(u64));
+
+	return (void *)offset;
+}
+
+static struct mem_detect_block *__get_mem_detect_block_ptr(u32 n)
+{
+	if (n < MEM_INLINED_ENTRIES)
+		return &mem_detect.entries[n];
+	if (unlikely(!mem_detect.entries_extended))
+		mem_detect.entries_extended = mem_detect_alloc_extended();
+	return &mem_detect.entries_extended[n - MEM_INLINED_ENTRIES];
+}
+
+/*
+ * sequential calls to add_mem_detect_block with adjacent memory areas
+ * are merged together into single memory block.
+ */
+void add_mem_detect_block(u64 start, u64 end)
+{
+	struct mem_detect_block *block;
+
+	if (mem_detect.count) {
+		block = __get_mem_detect_block_ptr(mem_detect.count - 1);
+		if (block->end == start) {
+			block->end = end;
+			return;
+		}
+	}
+
+	block = __get_mem_detect_block_ptr(mem_detect.count);
+	block->start = start;
+	block->end = end;
+	mem_detect.count++;
+}
+
+static unsigned long get_mem_detect_end(void)
+{
+	if (mem_detect.count)
+		return __get_mem_detect_block_ptr(mem_detect.count - 1)->end;
+	return 0;
+}
+
+static int __diag260(unsigned long rx1, unsigned long rx2)
+{
+	register unsigned long _rx1 asm("2") = rx1;
+	register unsigned long _rx2 asm("3") = rx2;
+	register unsigned long _ry asm("4") = 0x10; /* storage configuration */
+	int rc = -1;				    /* fail */
+	unsigned long reg1, reg2;
+	psw_t old = S390_lowcore.program_new_psw;
+
+	asm volatile(
+		"	epsw	%0,%1\n"
+		"	st	%0,%[psw_pgm]\n"
+		"	st	%1,%[psw_pgm]+4\n"
+		"	larl	%0,1f\n"
+		"	stg	%0,%[psw_pgm]+8\n"
+		"	diag	%[rx],%[ry],0x260\n"
+		"	ipm	%[rc]\n"
+		"	srl	%[rc],28\n"
+		"1:\n"
+		: "=&d" (reg1), "=&a" (reg2),
+		  [psw_pgm] "=Q" (S390_lowcore.program_new_psw),
+		  [rc] "+&d" (rc), [ry] "+d" (_ry)
+		: [rx] "d" (_rx1), "d" (_rx2)
+		: "cc", "memory");
+	S390_lowcore.program_new_psw = old;
+	return rc == 0 ? _ry : -1;
+}
+
+static int diag260(void)
+{
+	int rc, i;
+
+	struct {
+		unsigned long start;
+		unsigned long end;
+	} storage_extents[8] __aligned(16); /* VM supports up to 8 extends */
+
+	memset(storage_extents, 0, sizeof(storage_extents));
+	rc = __diag260((unsigned long)storage_extents, sizeof(storage_extents));
+	if (rc == -1)
+		return -1;
+
+	for (i = 0; i < min_t(int, rc, ARRAY_SIZE(storage_extents)); i++)
+		add_mem_detect_block(storage_extents[i].start, storage_extents[i].end + 1);
+	return 0;
+}
+
+static int tprot(unsigned long addr)
+{
+	unsigned long pgm_addr;
+	int rc = -EFAULT;
+	psw_t old = S390_lowcore.program_new_psw;
+
+	S390_lowcore.program_new_psw.mask = __extract_psw();
+	asm volatile(
+		"	larl	%[pgm_addr],1f\n"
+		"	stg	%[pgm_addr],%[psw_pgm_addr]\n"
+		"	tprot	0(%[addr]),0\n"
+		"	ipm	%[rc]\n"
+		"	srl	%[rc],28\n"
+		"1:\n"
+		: [pgm_addr] "=&d"(pgm_addr),
+		  [psw_pgm_addr] "=Q"(S390_lowcore.program_new_psw.addr),
+		  [rc] "+&d"(rc)
+		: [addr] "a"(addr)
+		: "cc", "memory");
+	S390_lowcore.program_new_psw = old;
+	return rc;
+}
+
+static void search_mem_end(void)
+{
+	unsigned long range = 1 << (MAX_PHYSMEM_BITS - 20); /* in 1MB blocks */
+	unsigned long offset = 0;
+	unsigned long pivot;
+
+	while (range > 1) {
+		range >>= 1;
+		pivot = offset + range;
+		if (!tprot(pivot << 20))
+			offset = pivot;
+	}
+
+	add_mem_detect_block(0, (offset + 1) << 20);
+}
+
+void detect_memory(void)
+{
+	sclp_early_get_memsize(&max_physmem_end);
+
+	if (!sclp_early_read_storage_info()) {
+		mem_detect.info_source = MEM_DETECT_SCLP_STOR_INFO;
+		return;
+	}
+
+	if (!diag260()) {
+		mem_detect.info_source = MEM_DETECT_DIAG260;
+		return;
+	}
+
+	if (max_physmem_end) {
+		add_mem_detect_block(0, max_physmem_end);
+		mem_detect.info_source = MEM_DETECT_SCLP_READ_INFO;
+		return;
+	}
+
+	search_mem_end();
+	mem_detect.info_source = MEM_DETECT_BIN_SEARCH;
+	max_physmem_end = get_mem_detect_end();
+}
diff --git a/arch/s390/boot/startup.c b/arch/s390/boot/startup.c
new file mode 100644
index 000000000000..4d441317cdeb
--- /dev/null
+++ b/arch/s390/boot/startup.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/string.h>
+#include <asm/setup.h>
+#include <asm/sclp.h>
+#include "compressed/decompressor.h"
+#include "boot.h"
+
+extern char __boot_data_start[], __boot_data_end[];
+
+void error(char *x)
+{
+	sclp_early_printk("\n\n");
+	sclp_early_printk(x);
+	sclp_early_printk("\n\n -- System halted");
+
+	disabled_wait(0xdeadbeef);
+}
+
+#ifdef CONFIG_KERNEL_UNCOMPRESSED
+unsigned long mem_safe_offset(void)
+{
+	return vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size;
+}
+#endif
+
+static void rescue_initrd(void)
+{
+	unsigned long min_initrd_addr;
+
+	if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD))
+		return;
+	if (!INITRD_START || !INITRD_SIZE)
+		return;
+	min_initrd_addr = mem_safe_offset();
+	if (min_initrd_addr <= INITRD_START)
+		return;
+	memmove((void *)min_initrd_addr, (void *)INITRD_START, INITRD_SIZE);
+	INITRD_START = min_initrd_addr;
+}
+
+static void copy_bootdata(void)
+{
+	if (__boot_data_end - __boot_data_start != vmlinux.bootdata_size)
+		error(".boot.data section size mismatch");
+	memcpy((void *)vmlinux.bootdata_off, __boot_data_start, vmlinux.bootdata_size);
+}
+
+void startup_kernel(void)
+{
+	void *img;
+
+	rescue_initrd();
+	sclp_early_read_info();
+	store_ipl_parmblock();
+	setup_boot_command_line();
+	setup_memory_end();
+	detect_memory();
+	if (!IS_ENABLED(CONFIG_KERNEL_UNCOMPRESSED)) {
+		img = decompress_kernel();
+		memmove((void *)vmlinux.default_lma, img, vmlinux.image_size);
+	}
+	copy_bootdata();
+	vmlinux.entry();
+}
diff --git a/arch/s390/boot/string.c b/arch/s390/boot/string.c
new file mode 100644
index 000000000000..25aca07898ba
--- /dev/null
+++ b/arch/s390/boot/string.c
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/ctype.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include "../lib/string.c"
+
+int strncmp(const char *cs, const char *ct, size_t count)
+{
+	unsigned char c1, c2;
+
+	while (count) {
+		c1 = *cs++;
+		c2 = *ct++;
+		if (c1 != c2)
+			return c1 < c2 ? -1 : 1;
+		if (!c1)
+			break;
+		count--;
+	}
+	return 0;
+}
+
+char *skip_spaces(const char *str)
+{
+	while (isspace(*str))
+		++str;
+	return (char *)str;
+}
+
+char *strim(char *s)
+{
+	size_t size;
+	char *end;
+
+	size = strlen(s);
+	if (!size)
+		return s;
+
+	end = s + size - 1;
+	while (end >= s && isspace(*end))
+		end--;
+	*(end + 1) = '\0';
+
+	return skip_spaces(s);
+}
+
+/* Works only for digits and letters, but small and fast */
+#define TOLOWER(x) ((x) | 0x20)
+
+static unsigned int simple_guess_base(const char *cp)
+{
+	if (cp[0] == '0') {
+		if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
+			return 16;
+		else
+			return 8;
+	} else {
+		return 10;
+	}
+}
+
+/**
+ * simple_strtoull - convert a string to an unsigned long long
+ * @cp: The start of the string
+ * @endp: A pointer to the end of the parsed string will be placed here
+ * @base: The number base to use
+ */
+
+unsigned long long simple_strtoull(const char *cp, char **endp,
+				   unsigned int base)
+{
+	unsigned long long result = 0;
+
+	if (!base)
+		base = simple_guess_base(cp);
+
+	if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
+		cp += 2;
+
+	while (isxdigit(*cp)) {
+		unsigned int value;
+
+		value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
+		if (value >= base)
+			break;
+		result = result * base + value;
+		cp++;
+	}
+	if (endp)
+		*endp = (char *)cp;
+
+	return result;
+}
+
+long simple_strtol(const char *cp, char **endp, unsigned int base)
+{
+	if (*cp == '-')
+		return -simple_strtoull(cp + 1, endp, base);
+
+	return simple_strtoull(cp, endp, base);
+}
+
+int kstrtobool(const char *s, bool *res)
+{
+	if (!s)
+		return -EINVAL;
+
+	switch (s[0]) {
+	case 'y':
+	case 'Y':
+	case '1':
+		*res = true;
+		return 0;
+	case 'n':
+	case 'N':
+	case '0':
+		*res = false;
+		return 0;
+	case 'o':
+	case 'O':
+		switch (s[1]) {
+		case 'n':
+		case 'N':
+			*res = true;
+			return 0;
+		case 'f':
+		case 'F':
+			*res = false;
+			return 0;
+		default:
+			break;
+		}
+	default:
+		break;
+	}
+
+	return -EINVAL;
+}
diff --git a/arch/s390/crypto/paes_s390.c b/arch/s390/crypto/paes_s390.c
index ab9a0ebecc19..e8d9fa54569c 100644
--- a/arch/s390/crypto/paes_s390.c
+++ b/arch/s390/crypto/paes_s390.c
@@ -30,26 +30,31 @@ static DEFINE_SPINLOCK(ctrblk_lock);
 
 static cpacf_mask_t km_functions, kmc_functions, kmctr_functions;
 
+struct key_blob {
+	__u8 key[MAXKEYBLOBSIZE];
+	unsigned int keylen;
+};
+
 struct s390_paes_ctx {
-	struct pkey_seckey sk;
+	struct key_blob kb;
 	struct pkey_protkey pk;
 	unsigned long fc;
 };
 
 struct s390_pxts_ctx {
-	struct pkey_seckey sk[2];
+	struct key_blob kb[2];
 	struct pkey_protkey pk[2];
 	unsigned long fc;
 };
 
-static inline int __paes_convert_key(struct pkey_seckey *sk,
+static inline int __paes_convert_key(struct key_blob *kb,
 				     struct pkey_protkey *pk)
 {
 	int i, ret;
 
 	/* try three times in case of failure */
 	for (i = 0; i < 3; i++) {
-		ret = pkey_skey2pkey(sk, pk);
+		ret = pkey_keyblob2pkey(kb->key, kb->keylen, pk);
 		if (ret == 0)
 			break;
 	}
@@ -61,7 +66,7 @@ static int __paes_set_key(struct s390_paes_ctx *ctx)
 {
 	unsigned long fc;
 
-	if (__paes_convert_key(&ctx->sk, &ctx->pk))
+	if (__paes_convert_key(&ctx->kb, &ctx->pk))
 		return -EINVAL;
 
 	/* Pick the correct function code based on the protected key type */
@@ -80,10 +85,8 @@ static int ecb_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 {
 	struct s390_paes_ctx *ctx = crypto_tfm_ctx(tfm);
 
-	if (key_len != SECKEYBLOBSIZE)
-		return -EINVAL;
-
-	memcpy(ctx->sk.seckey, in_key, SECKEYBLOBSIZE);
+	memcpy(ctx->kb.key, in_key, key_len);
+	ctx->kb.keylen = key_len;
 	if (__paes_set_key(ctx)) {
 		tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 		return -EINVAL;
@@ -147,8 +150,8 @@ static struct crypto_alg ecb_paes_alg = {
 	.cra_list		=	LIST_HEAD_INIT(ecb_paes_alg.cra_list),
 	.cra_u			=	{
 		.blkcipher = {
-			.min_keysize		=	SECKEYBLOBSIZE,
-			.max_keysize		=	SECKEYBLOBSIZE,
+			.min_keysize		=	MINKEYBLOBSIZE,
+			.max_keysize		=	MAXKEYBLOBSIZE,
 			.setkey			=	ecb_paes_set_key,
 			.encrypt		=	ecb_paes_encrypt,
 			.decrypt		=	ecb_paes_decrypt,
@@ -160,7 +163,7 @@ static int __cbc_paes_set_key(struct s390_paes_ctx *ctx)
 {
 	unsigned long fc;
 
-	if (__paes_convert_key(&ctx->sk, &ctx->pk))
+	if (__paes_convert_key(&ctx->kb, &ctx->pk))
 		return -EINVAL;
 
 	/* Pick the correct function code based on the protected key type */
@@ -179,7 +182,8 @@ static int cbc_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 {
 	struct s390_paes_ctx *ctx = crypto_tfm_ctx(tfm);
 
-	memcpy(ctx->sk.seckey, in_key, SECKEYBLOBSIZE);
+	memcpy(ctx->kb.key, in_key, key_len);
+	ctx->kb.keylen = key_len;
 	if (__cbc_paes_set_key(ctx)) {
 		tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 		return -EINVAL;
@@ -250,8 +254,8 @@ static struct crypto_alg cbc_paes_alg = {
 	.cra_list		=	LIST_HEAD_INIT(cbc_paes_alg.cra_list),
 	.cra_u			=	{
 		.blkcipher = {
-			.min_keysize		=	SECKEYBLOBSIZE,
-			.max_keysize		=	SECKEYBLOBSIZE,
+			.min_keysize		=	MINKEYBLOBSIZE,
+			.max_keysize		=	MAXKEYBLOBSIZE,
 			.ivsize			=	AES_BLOCK_SIZE,
 			.setkey			=	cbc_paes_set_key,
 			.encrypt		=	cbc_paes_encrypt,
@@ -264,8 +268,8 @@ static int __xts_paes_set_key(struct s390_pxts_ctx *ctx)
 {
 	unsigned long fc;
 
-	if (__paes_convert_key(&ctx->sk[0], &ctx->pk[0]) ||
-	    __paes_convert_key(&ctx->sk[1], &ctx->pk[1]))
+	if (__paes_convert_key(&ctx->kb[0], &ctx->pk[0]) ||
+	    __paes_convert_key(&ctx->kb[1], &ctx->pk[1]))
 		return -EINVAL;
 
 	if (ctx->pk[0].type != ctx->pk[1].type)
@@ -287,10 +291,16 @@ static int xts_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 {
 	struct s390_pxts_ctx *ctx = crypto_tfm_ctx(tfm);
 	u8 ckey[2 * AES_MAX_KEY_SIZE];
-	unsigned int ckey_len;
+	unsigned int ckey_len, keytok_len;
+
+	if (key_len % 2)
+		return -EINVAL;
 
-	memcpy(ctx->sk[0].seckey, in_key, SECKEYBLOBSIZE);
-	memcpy(ctx->sk[1].seckey, in_key + SECKEYBLOBSIZE, SECKEYBLOBSIZE);
+	keytok_len = key_len / 2;
+	memcpy(ctx->kb[0].key, in_key, keytok_len);
+	ctx->kb[0].keylen = keytok_len;
+	memcpy(ctx->kb[1].key, in_key + keytok_len, keytok_len);
+	ctx->kb[1].keylen = keytok_len;
 	if (__xts_paes_set_key(ctx)) {
 		tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 		return -EINVAL;
@@ -386,8 +396,8 @@ static struct crypto_alg xts_paes_alg = {
 	.cra_list		=	LIST_HEAD_INIT(xts_paes_alg.cra_list),
 	.cra_u			=	{
 		.blkcipher = {
-			.min_keysize		=	2 * SECKEYBLOBSIZE,
-			.max_keysize		=	2 * SECKEYBLOBSIZE,
+			.min_keysize		=	2 * MINKEYBLOBSIZE,
+			.max_keysize		=	2 * MAXKEYBLOBSIZE,
 			.ivsize			=	AES_BLOCK_SIZE,
 			.setkey			=	xts_paes_set_key,
 			.encrypt		=	xts_paes_encrypt,
@@ -400,7 +410,7 @@ static int __ctr_paes_set_key(struct s390_paes_ctx *ctx)
 {
 	unsigned long fc;
 
-	if (__paes_convert_key(&ctx->sk, &ctx->pk))
+	if (__paes_convert_key(&ctx->kb, &ctx->pk))
 		return -EINVAL;
 
 	/* Pick the correct function code based on the protected key type */
@@ -420,7 +430,8 @@ static int ctr_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 {
 	struct s390_paes_ctx *ctx = crypto_tfm_ctx(tfm);
 
-	memcpy(ctx->sk.seckey, in_key, key_len);
+	memcpy(ctx->kb.key, in_key, key_len);
+	ctx->kb.keylen = key_len;
 	if (__ctr_paes_set_key(ctx)) {
 		tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 		return -EINVAL;
@@ -532,8 +543,8 @@ static struct crypto_alg ctr_paes_alg = {
 	.cra_list		=	LIST_HEAD_INIT(ctr_paes_alg.cra_list),
 	.cra_u			=	{
 		.blkcipher = {
-			.min_keysize		=	SECKEYBLOBSIZE,
-			.max_keysize		=	SECKEYBLOBSIZE,
+			.min_keysize		=	MINKEYBLOBSIZE,
+			.max_keysize		=	MAXKEYBLOBSIZE,
 			.ivsize			=	AES_BLOCK_SIZE,
 			.setkey			=	ctr_paes_set_key,
 			.encrypt		=	ctr_paes_encrypt,
diff --git a/arch/s390/defconfig b/arch/s390/defconfig
index f40600eb1762..20add000dd6d 100644
--- a/arch/s390/defconfig
+++ b/arch/s390/defconfig
@@ -232,6 +232,7 @@ CONFIG_CRYPTO_USER_API_HASH=m
 CONFIG_CRYPTO_USER_API_SKCIPHER=m
 CONFIG_CRYPTO_USER_API_RNG=m
 CONFIG_ZCRYPT=m
+CONFIG_ZCRYPT_MULTIDEVNODES=y
 CONFIG_PKEY=m
 CONFIG_CRYPTO_PAES_S390=m
 CONFIG_CRYPTO_SHA1_S390=m
diff --git a/arch/s390/hypfs/hypfs_sprp.c b/arch/s390/hypfs/hypfs_sprp.c
index 5d85a039391c..601b70786dc8 100644
--- a/arch/s390/hypfs/hypfs_sprp.c
+++ b/arch/s390/hypfs/hypfs_sprp.c
@@ -68,40 +68,44 @@ static int hypfs_sprp_create(void **data_ptr, void **free_ptr, size_t *size)
 
 static int __hypfs_sprp_ioctl(void __user *user_area)
 {
-	struct hypfs_diag304 diag304;
+	struct hypfs_diag304 *diag304;
 	unsigned long cmd;
 	void __user *udata;
 	void *data;
 	int rc;
 
-	if (copy_from_user(&diag304, user_area, sizeof(diag304)))
-		return -EFAULT;
-	if ((diag304.args[0] >> 8) != 0 || diag304.args[1] > DIAG304_CMD_MAX)
-		return -EINVAL;
-
+	rc = -ENOMEM;
 	data = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
-	if (!data)
-		return -ENOMEM;
-
-	udata = (void __user *)(unsigned long) diag304.data;
-	if (diag304.args[1] == DIAG304_SET_WEIGHTS ||
-	    diag304.args[1] == DIAG304_SET_CAPPING)
-		if (copy_from_user(data, udata, PAGE_SIZE)) {
-			rc = -EFAULT;
+	diag304 = kzalloc(sizeof(*diag304), GFP_KERNEL);
+	if (!data || !diag304)
+		goto out;
+
+	rc = -EFAULT;
+	if (copy_from_user(diag304, user_area, sizeof(*diag304)))
+		goto out;
+	rc = -EINVAL;
+	if ((diag304->args[0] >> 8) != 0 || diag304->args[1] > DIAG304_CMD_MAX)
+		goto out;
+
+	rc = -EFAULT;
+	udata = (void __user *)(unsigned long) diag304->data;
+	if (diag304->args[1] == DIAG304_SET_WEIGHTS ||
+	    diag304->args[1] == DIAG304_SET_CAPPING)
+		if (copy_from_user(data, udata, PAGE_SIZE))
 			goto out;
-		}
 
-	cmd = *(unsigned long *) &diag304.args[0];
-	diag304.rc = hypfs_sprp_diag304(data, cmd);
+	cmd = *(unsigned long *) &diag304->args[0];
+	diag304->rc = hypfs_sprp_diag304(data, cmd);
 
-	if (diag304.args[1] == DIAG304_QUERY_PRP)
+	if (diag304->args[1] == DIAG304_QUERY_PRP)
 		if (copy_to_user(udata, data, PAGE_SIZE)) {
 			rc = -EFAULT;
 			goto out;
 		}
 
-	rc = copy_to_user(user_area, &diag304, sizeof(diag304)) ? -EFAULT : 0;
+	rc = copy_to_user(user_area, diag304, sizeof(*diag304)) ? -EFAULT : 0;
 out:
+	kfree(diag304);
 	free_page((unsigned long) data);
 	return rc;
 }
diff --git a/arch/s390/include/asm/appldata.h b/arch/s390/include/asm/appldata.h
index 4afbb5938726..c5bd9f4437e5 100644
--- a/arch/s390/include/asm/appldata.h
+++ b/arch/s390/include/asm/appldata.h
@@ -40,26 +40,27 @@ struct appldata_product_id {
 	u16  mod_lvl;		/* modification level */
 } __attribute__ ((packed));
 
-static inline int appldata_asm(struct appldata_product_id *id,
+
+static inline int appldata_asm(struct appldata_parameter_list *parm_list,
+			       struct appldata_product_id *id,
 			       unsigned short fn, void *buffer,
 			       unsigned short length)
 {
-	struct appldata_parameter_list parm_list;
 	int ry;
 
 	if (!MACHINE_IS_VM)
 		return -EOPNOTSUPP;
-	parm_list.diag = 0xdc;
-	parm_list.function = fn;
-	parm_list.parlist_length = sizeof(parm_list);
-	parm_list.buffer_length = length;
-	parm_list.product_id_addr = (unsigned long) id;
-	parm_list.buffer_addr = virt_to_phys(buffer);
+	parm_list->diag = 0xdc;
+	parm_list->function = fn;
+	parm_list->parlist_length = sizeof(*parm_list);
+	parm_list->buffer_length = length;
+	parm_list->product_id_addr = (unsigned long) id;
+	parm_list->buffer_addr = virt_to_phys(buffer);
 	diag_stat_inc(DIAG_STAT_X0DC);
 	asm volatile(
 		"	diag	%1,%0,0xdc"
 		: "=d" (ry)
-		: "d" (&parm_list), "m" (parm_list), "m" (*id)
+		: "d" (parm_list), "m" (*parm_list), "m" (*id)
 		: "cc");
 	return ry;
 }
diff --git a/arch/s390/include/asm/boot_data.h b/arch/s390/include/asm/boot_data.h
new file mode 100644
index 000000000000..2d999ccb977a
--- /dev/null
+++ b/arch/s390/include/asm/boot_data.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_S390_BOOT_DATA_H
+
+#include <asm/setup.h>
+#include <asm/ipl.h>
+
+extern char early_command_line[COMMAND_LINE_SIZE];
+extern struct ipl_parameter_block early_ipl_block;
+extern int early_ipl_block_valid;
+
+#endif /* _ASM_S390_BOOT_DATA_H */
diff --git a/arch/s390/include/asm/ccwgroup.h b/arch/s390/include/asm/ccwgroup.h
index 860cab7479c3..7293c139dd79 100644
--- a/arch/s390/include/asm/ccwgroup.h
+++ b/arch/s390/include/asm/ccwgroup.h
@@ -64,6 +64,8 @@ extern int  ccwgroup_driver_register   (struct ccwgroup_driver *cdriver);
 extern void ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver);
 int ccwgroup_create_dev(struct device *root, struct ccwgroup_driver *gdrv,
 			int num_devices, const char *buf);
+struct ccwgroup_device *get_ccwgroupdev_by_busid(struct ccwgroup_driver *gdrv,
+						 char *bus_id);
 
 extern int ccwgroup_set_online(struct ccwgroup_device *gdev);
 extern int ccwgroup_set_offline(struct ccwgroup_device *gdev);
diff --git a/arch/s390/include/asm/facility.h b/arch/s390/include/asm/facility.h
index 99c8ce30b3cd..e78cda94456b 100644
--- a/arch/s390/include/asm/facility.h
+++ b/arch/s390/include/asm/facility.h
@@ -64,11 +64,10 @@ static inline int test_facility(unsigned long nr)
  * @stfle_fac_list: array where facility list can be stored
  * @size: size of passed in array in double words
  */
-static inline void stfle(u64 *stfle_fac_list, int size)
+static inline void __stfle(u64 *stfle_fac_list, int size)
 {
 	unsigned long nr;
 
-	preempt_disable();
 	asm volatile(
 		"	stfl	0(0)\n"
 		: "=m" (S390_lowcore.stfl_fac_list));
@@ -85,6 +84,12 @@ static inline void stfle(u64 *stfle_fac_list, int size)
 		nr = (reg0 + 1) * 8; /* # bytes stored by stfle */
 	}
 	memset((char *) stfle_fac_list + nr, 0, size * 8 - nr);
+}
+
+static inline void stfle(u64 *stfle_fac_list, int size)
+{
+	preempt_disable();
+	__stfle(stfle_fac_list, size);
 	preempt_enable();
 }
 
diff --git a/arch/s390/include/asm/ipl.h b/arch/s390/include/asm/ipl.h
index ae5135704616..a8389e2d2f03 100644
--- a/arch/s390/include/asm/ipl.h
+++ b/arch/s390/include/asm/ipl.h
@@ -89,8 +89,8 @@ void __init save_area_add_vxrs(struct save_area *, __vector128 *vxrs);
 
 extern void s390_reset_system(void);
 extern void ipl_store_parameters(void);
-extern size_t append_ipl_vmparm(char *, size_t);
-extern size_t append_ipl_scpdata(char *, size_t);
+extern size_t ipl_block_get_ascii_vmparm(char *dest, size_t size,
+					 const struct ipl_parameter_block *ipb);
 
 enum ipl_type {
 	IPL_TYPE_UNKNOWN	= 1,
diff --git a/arch/s390/include/asm/kasan.h b/arch/s390/include/asm/kasan.h
new file mode 100644
index 000000000000..70930fe5c496
--- /dev/null
+++ b/arch/s390/include/asm/kasan.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_KASAN_H
+#define __ASM_KASAN_H
+
+#include <asm/pgtable.h>
+
+#ifdef CONFIG_KASAN
+
+#define KASAN_SHADOW_SCALE_SHIFT 3
+#ifdef CONFIG_KASAN_S390_4_LEVEL_PAGING
+#define KASAN_SHADOW_SIZE						       \
+	(_AC(1, UL) << (_REGION1_SHIFT - KASAN_SHADOW_SCALE_SHIFT))
+#else
+#define KASAN_SHADOW_SIZE						       \
+	(_AC(1, UL) << (_REGION2_SHIFT - KASAN_SHADOW_SCALE_SHIFT))
+#endif
+#define KASAN_SHADOW_OFFSET	_AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
+#define KASAN_SHADOW_START	KASAN_SHADOW_OFFSET
+#define KASAN_SHADOW_END	(KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
+
+extern void kasan_early_init(void);
+extern void kasan_copy_shadow(pgd_t *dst);
+extern void kasan_free_early_identity(void);
+#else
+static inline void kasan_early_init(void) { }
+static inline void kasan_copy_shadow(pgd_t *dst) { }
+static inline void kasan_free_early_identity(void) { }
+#endif
+
+#endif
diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h
index 406d940173ab..cc0947e08b6f 100644
--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -102,9 +102,9 @@ struct lowcore {
 	__u64	current_task;			/* 0x0338 */
 	__u64	kernel_stack;			/* 0x0340 */
 
-	/* Interrupt, panic and restart stack. */
+	/* Interrupt, DAT-off and restartstack. */
 	__u64	async_stack;			/* 0x0348 */
-	__u64	panic_stack;			/* 0x0350 */
+	__u64	nodat_stack;			/* 0x0350 */
 	__u64	restart_stack;			/* 0x0358 */
 
 	/* Restart function and parameter. */
diff --git a/arch/s390/include/asm/mem_detect.h b/arch/s390/include/asm/mem_detect.h
new file mode 100644
index 000000000000..6114b92ab667
--- /dev/null
+++ b/arch/s390/include/asm/mem_detect.h
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_S390_MEM_DETECT_H
+#define _ASM_S390_MEM_DETECT_H
+
+#include <linux/types.h>
+
+enum mem_info_source {
+	MEM_DETECT_NONE = 0,
+	MEM_DETECT_SCLP_STOR_INFO,
+	MEM_DETECT_DIAG260,
+	MEM_DETECT_SCLP_READ_INFO,
+	MEM_DETECT_BIN_SEARCH
+};
+
+struct mem_detect_block {
+	u64 start;
+	u64 end;
+};
+
+/*
+ * Storage element id is defined as 1 byte (up to 256 storage elements).
+ * In practise only storage element id 0 and 1 are used).
+ * According to architecture one storage element could have as much as
+ * 1020 subincrements. 255 mem_detect_blocks are embedded in mem_detect_info.
+ * If more mem_detect_blocks are required, a block of memory from already
+ * known mem_detect_block is taken (entries_extended points to it).
+ */
+#define MEM_INLINED_ENTRIES 255 /* (PAGE_SIZE - 16) / 16 */
+
+struct mem_detect_info {
+	u32 count;
+	u8 info_source;
+	struct mem_detect_block entries[MEM_INLINED_ENTRIES];
+	struct mem_detect_block *entries_extended;
+};
+extern struct mem_detect_info mem_detect;
+
+void add_mem_detect_block(u64 start, u64 end);
+
+static inline int __get_mem_detect_block(u32 n, unsigned long *start,
+					 unsigned long *end)
+{
+	if (n >= mem_detect.count) {
+		*start = 0;
+		*end = 0;
+		return -1;
+	}
+
+	if (n < MEM_INLINED_ENTRIES) {
+		*start = (unsigned long)mem_detect.entries[n].start;
+		*end = (unsigned long)mem_detect.entries[n].end;
+	} else {
+		*start = (unsigned long)mem_detect.entries_extended[n - MEM_INLINED_ENTRIES].start;
+		*end = (unsigned long)mem_detect.entries_extended[n - MEM_INLINED_ENTRIES].end;
+	}
+	return 0;
+}
+
+/**
+ * for_each_mem_detect_block - early online memory range iterator
+ * @i: an integer used as loop variable
+ * @p_start: ptr to unsigned long for start address of the range
+ * @p_end: ptr to unsigned long for end address of the range
+ *
+ * Walks over detected online memory ranges.
+ */
+#define for_each_mem_detect_block(i, p_start, p_end)			\
+	for (i = 0, __get_mem_detect_block(i, p_start, p_end);		\
+	     i < mem_detect.count;					\
+	     i++, __get_mem_detect_block(i, p_start, p_end))
+
+static inline void get_mem_detect_reserved(unsigned long *start,
+					   unsigned long *size)
+{
+	*start = (unsigned long)mem_detect.entries_extended;
+	if (mem_detect.count > MEM_INLINED_ENTRIES)
+		*size = (mem_detect.count - MEM_INLINED_ENTRIES) * sizeof(struct mem_detect_block);
+	else
+		*size = 0;
+}
+
+#endif
diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h
index a8418e1379eb..bcfb6371086f 100644
--- a/arch/s390/include/asm/mmu.h
+++ b/arch/s390/include/asm/mmu.h
@@ -32,6 +32,8 @@ typedef struct {
 	unsigned int uses_cmm:1;
 	/* The gmaps associated with this context are allowed to use huge pages. */
 	unsigned int allow_gmap_hpage_1m:1;
+	/* The mmu context is for compat task */
+	unsigned int compat_mm:1;
 } mm_context_t;
 
 #define INIT_MM_CONTEXT(name)						   \
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index 0717ee76885d..dbd689d556ce 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -25,6 +25,7 @@ static inline int init_new_context(struct task_struct *tsk,
 	atomic_set(&mm->context.flush_count, 0);
 	mm->context.gmap_asce = 0;
 	mm->context.flush_mm = 0;
+	mm->context.compat_mm = 0;
 #ifdef CONFIG_PGSTE
 	mm->context.alloc_pgste = page_table_allocate_pgste ||
 		test_thread_flag(TIF_PGSTE) ||
diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h
index 41e3908b397f..a4d38092530a 100644
--- a/arch/s390/include/asm/page.h
+++ b/arch/s390/include/asm/page.h
@@ -161,6 +161,7 @@ static inline int devmem_is_allowed(unsigned long pfn)
 
 #define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
 #define pfn_to_virt(pfn)	__va((pfn) << PAGE_SHIFT)
+#define pfn_to_kaddr(pfn)	pfn_to_virt(pfn)
 
 #define virt_to_page(kaddr)	pfn_to_page(virt_to_pfn(kaddr))
 #define page_to_virt(page)	pfn_to_virt(page_to_pfn(page))
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 0e7cb0dc9c33..411d435e7a7d 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -341,6 +341,8 @@ static inline int is_module_addr(void *addr)
 #define PTRS_PER_P4D	_CRST_ENTRIES
 #define PTRS_PER_PGD	_CRST_ENTRIES
 
+#define MAX_PTRS_PER_P4D	PTRS_PER_P4D
+
 /*
  * Segment table and region3 table entry encoding
  * (R = read-only, I = invalid, y = young bit):
@@ -466,6 +468,12 @@ static inline int is_module_addr(void *addr)
 				 _SEGMENT_ENTRY_YOUNG |	\
 				 _SEGMENT_ENTRY_PROTECT | \
 				 _SEGMENT_ENTRY_NOEXEC)
+#define SEGMENT_KERNEL_EXEC __pgprot(_SEGMENT_ENTRY |	\
+				 _SEGMENT_ENTRY_LARGE |	\
+				 _SEGMENT_ENTRY_READ |	\
+				 _SEGMENT_ENTRY_WRITE | \
+				 _SEGMENT_ENTRY_YOUNG |	\
+				 _SEGMENT_ENTRY_DIRTY)
 
 /*
  * Region3 entry (large page) protection definitions.
@@ -599,6 +607,14 @@ static inline int pgd_bad(pgd_t pgd)
 	return (pgd_val(pgd) & mask) != 0;
 }
 
+static inline unsigned long pgd_pfn(pgd_t pgd)
+{
+	unsigned long origin_mask;
+
+	origin_mask = _REGION_ENTRY_ORIGIN;
+	return (pgd_val(pgd) & origin_mask) >> PAGE_SHIFT;
+}
+
 static inline int p4d_folded(p4d_t p4d)
 {
 	return (p4d_val(p4d) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2;
@@ -1171,6 +1187,7 @@ static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
 
 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
+#define pgd_offset_raw(pgd, addr) ((pgd) + pgd_index(addr))
 
 #define pmd_deref(pmd) (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN)
 #define pud_deref(pud) (pud_val(pud) & _REGION_ENTRY_ORIGIN)
@@ -1210,7 +1227,8 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
 
 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
 #define pud_page(pud) pfn_to_page(pud_pfn(pud))
-#define p4d_page(pud) pfn_to_page(p4d_pfn(p4d))
+#define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d))
+#define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd))
 
 /* Find an entry in the lowest level page table.. */
 #define pte_offset(pmd, addr) ((pte_t *) pmd_deref(*(pmd)) + pte_index(addr))
diff --git a/arch/s390/include/asm/pkey.h b/arch/s390/include/asm/pkey.h
index 053117ba7328..9b6e79077866 100644
--- a/arch/s390/include/asm/pkey.h
+++ b/arch/s390/include/asm/pkey.h
@@ -109,4 +109,30 @@ int pkey_verifykey(const struct pkey_seckey *seckey,
 		   u16 *pcardnr, u16 *pdomain,
 		   u16 *pkeysize, u32 *pattributes);
 
+/*
+ * In-kernel API: Generate (AES) random protected key.
+ * @param keytype one of the PKEY_KEYTYPE values
+ * @param protkey pointer to buffer receiving the protected key
+ * @return 0 on success, negative errno value on failure
+ */
+int pkey_genprotkey(__u32 keytype, struct pkey_protkey *protkey);
+
+/*
+ * In-kernel API: Verify an (AES) protected key.
+ * @param protkey pointer to buffer containing the protected key to verify
+ * @return 0 on success, negative errno value on failure. In case the protected
+ * key is not valid -EKEYREJECTED is returned
+ */
+int pkey_verifyprotkey(const struct pkey_protkey *protkey);
+
+/*
+ * In-kernel API: Transform an key blob (of any type) into a protected key.
+ * @param key pointer to a buffer containing the key blob
+ * @param keylen size of the key blob in bytes
+ * @param protkey pointer to buffer receiving the protected key
+ * @return 0 on success, negative errno value on failure
+ */
+int pkey_keyblob2pkey(const __u8 *key, __u32 keylen,
+		      struct pkey_protkey *protkey);
+
 #endif /* _KAPI_PKEY_H */
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 7f2953c15c37..34768e6ef4fb 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -242,7 +242,7 @@ static inline unsigned long current_stack_pointer(void)
 	return sp;
 }
 
-static inline unsigned short stap(void)
+static __no_sanitize_address_or_inline unsigned short stap(void)
 {
 	unsigned short cpu_address;
 
@@ -250,6 +250,55 @@ static inline unsigned short stap(void)
 	return cpu_address;
 }
 
+#define CALL_ARGS_0()							\
+	register unsigned long r2 asm("2")
+#define CALL_ARGS_1(arg1)						\
+	register unsigned long r2 asm("2") = (unsigned long)(arg1)
+#define CALL_ARGS_2(arg1, arg2)						\
+	CALL_ARGS_1(arg1);						\
+	register unsigned long r3 asm("3") = (unsigned long)(arg2)
+#define CALL_ARGS_3(arg1, arg2, arg3)					\
+	CALL_ARGS_2(arg1, arg2);					\
+	register unsigned long r4 asm("4") = (unsigned long)(arg3)
+#define CALL_ARGS_4(arg1, arg2, arg3, arg4)				\
+	CALL_ARGS_3(arg1, arg2, arg3);					\
+	register unsigned long r4 asm("5") = (unsigned long)(arg4)
+#define CALL_ARGS_5(arg1, arg2, arg3, arg4, arg5)			\
+	CALL_ARGS_4(arg1, arg2, arg3, arg4);				\
+	register unsigned long r4 asm("6") = (unsigned long)(arg5)
+
+#define CALL_FMT_0
+#define CALL_FMT_1 CALL_FMT_0, "0" (r2)
+#define CALL_FMT_2 CALL_FMT_1, "d" (r3)
+#define CALL_FMT_3 CALL_FMT_2, "d" (r4)
+#define CALL_FMT_4 CALL_FMT_3, "d" (r5)
+#define CALL_FMT_5 CALL_FMT_4, "d" (r6)
+
+#define CALL_CLOBBER_5 "0", "1", "14", "cc", "memory"
+#define CALL_CLOBBER_4 CALL_CLOBBER_5
+#define CALL_CLOBBER_3 CALL_CLOBBER_4, "5"
+#define CALL_CLOBBER_2 CALL_CLOBBER_3, "4"
+#define CALL_CLOBBER_1 CALL_CLOBBER_2, "3"
+#define CALL_CLOBBER_0 CALL_CLOBBER_1
+
+#define CALL_ON_STACK(fn, stack, nr, args...)				\
+({									\
+	CALL_ARGS_##nr(args);						\
+	unsigned long prev;						\
+									\
+	asm volatile(							\
+		"	la	%[_prev],0(15)\n"			\
+		"	la	15,0(%[_stack])\n"			\
+		"	stg	%[_prev],%[_bc](15)\n"			\
+		"	brasl	14,%[_fn]\n"				\
+		"	la	15,0(%[_prev])\n"			\
+		: "+&d" (r2), [_prev] "=&a" (prev)			\
+		: [_stack] "a" (stack),					\
+		  [_bc] "i" (offsetof(struct stack_frame, back_chain)),	\
+		  [_fn] "X" (fn) CALL_FMT_##nr : CALL_CLOBBER_##nr);	\
+	r2;								\
+})
+
 /*
  * Give up the time slice of the virtual PU.
  */
@@ -287,7 +336,7 @@ static inline void __load_psw(psw_t psw)
  * Set PSW mask to specified value, while leaving the
  * PSW addr pointing to the next instruction.
  */
-static inline void __load_psw_mask(unsigned long mask)
+static __no_sanitize_address_or_inline void __load_psw_mask(unsigned long mask)
 {
 	unsigned long addr;
 	psw_t psw;
diff --git a/arch/s390/include/asm/qdio.h b/arch/s390/include/asm/qdio.h
index 9c9970a5dfb1..d46edde7e458 100644
--- a/arch/s390/include/asm/qdio.h
+++ b/arch/s390/include/asm/qdio.h
@@ -252,13 +252,11 @@ struct slsb {
  *   (for communication with upper layer programs)
  *   (only required for use with completion queues)
  * @flags: flags indicating state of buffer
- * @aob: pointer to QAOB used for the particular SBAL
  * @user: pointer to upper layer program's state information related to SBAL
  *        (stored in user1 data of QAOB)
  */
 struct qdio_outbuf_state {
 	u8 flags;
-	struct qaob *aob;
 	void *user;
 };
 
diff --git a/arch/s390/include/asm/sclp.h b/arch/s390/include/asm/sclp.h
index e44a8d7959f5..0cd4bda85eb1 100644
--- a/arch/s390/include/asm/sclp.h
+++ b/arch/s390/include/asm/sclp.h
@@ -95,6 +95,7 @@ extern struct sclp_info sclp;
 struct zpci_report_error_header {
 	u8 version;	/* Interface version byte */
 	u8 action;	/* Action qualifier byte
+			 * 0: Adapter Reset Request
 			 * 1: Deconfigure and repair action requested
 			 *	(OpenCrypto Problem Call Home)
 			 * 2: Informational Report
@@ -104,6 +105,8 @@ struct zpci_report_error_header {
 	u8 data[0];	/* Subsequent Data passed verbatim to SCLP ET 24 */
 } __packed;
 
+int sclp_early_read_info(void);
+int sclp_early_read_storage_info(void);
 int sclp_early_get_core_info(struct sclp_core_info *info);
 void sclp_early_get_ipl_info(struct sclp_ipl_info *info);
 void sclp_early_detect(void);
@@ -111,6 +114,8 @@ void sclp_early_printk(const char *s);
 void sclp_early_printk_force(const char *s);
 void __sclp_early_printk(const char *s, unsigned int len, unsigned int force);
 
+int sclp_early_get_memsize(unsigned long *mem);
+int sclp_early_get_hsa_size(unsigned long *hsa_size);
 int _sclp_get_core_info(struct sclp_core_info *info);
 int sclp_core_configure(u8 core);
 int sclp_core_deconfigure(u8 core);
diff --git a/arch/s390/include/asm/sections.h b/arch/s390/include/asm/sections.h
index 724faede8ac5..7afe4620685c 100644
--- a/arch/s390/include/asm/sections.h
+++ b/arch/s390/include/asm/sections.h
@@ -4,4 +4,16 @@
 
 #include <asm-generic/sections.h>
 
+/*
+ * .boot.data section contains variables "shared" between the decompressor and
+ * the decompressed kernel. The decompressor will store values in them, and
+ * copy over to the decompressed image before starting it.
+ *
+ * Each variable end up in its own intermediate section .boot.data.<var name>,
+ * those sections are later sorted by alignment + name and merged together into
+ * final .boot.data section, which should be identical in the decompressor and
+ * the decompressed kernel (that is checked during the build).
+ */
+#define __bootdata(var) __section(.boot.data.var) var
+
 #endif
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index 1d66016f4170..efda97804aa4 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -65,12 +65,11 @@
 #define OLDMEM_SIZE	(*(unsigned long *)  (OLDMEM_SIZE_OFFSET))
 #define COMMAND_LINE	((char *)	     (COMMAND_LINE_OFFSET))
 
+extern int noexec_disabled;
 extern int memory_end_set;
 extern unsigned long memory_end;
 extern unsigned long max_physmem_end;
 
-extern void detect_memory_memblock(void);
-
 #define MACHINE_IS_VM		(S390_lowcore.machine_flags & MACHINE_FLAG_VM)
 #define MACHINE_IS_KVM		(S390_lowcore.machine_flags & MACHINE_FLAG_KVM)
 #define MACHINE_IS_LPAR		(S390_lowcore.machine_flags & MACHINE_FLAG_LPAR)
diff --git a/arch/s390/include/asm/string.h b/arch/s390/include/asm/string.h
index 50f26fc9acb2..116cc15a4b8a 100644
--- a/arch/s390/include/asm/string.h
+++ b/arch/s390/include/asm/string.h
@@ -53,6 +53,27 @@ char *strstr(const char *s1, const char *s2);
 #undef __HAVE_ARCH_STRSEP
 #undef __HAVE_ARCH_STRSPN
 
+#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
+
+extern void *__memcpy(void *dest, const void *src, size_t n);
+extern void *__memset(void *s, int c, size_t n);
+extern void *__memmove(void *dest, const void *src, size_t n);
+
+/*
+ * For files that are not instrumented (e.g. mm/slub.c) we
+ * should use not instrumented version of mem* functions.
+ */
+
+#define memcpy(dst, src, len) __memcpy(dst, src, len)
+#define memmove(dst, src, len) __memmove(dst, src, len)
+#define memset(s, c, n) __memset(s, c, n)
+
+#ifndef __NO_FORTIFY
+#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
+#endif
+
+#endif /* defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__) */
+
 void *__memset16(uint16_t *s, uint16_t v, size_t count);
 void *__memset32(uint32_t *s, uint32_t v, size_t count);
 void *__memset64(uint64_t *s, uint64_t v, size_t count);
diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h
index 3c883c368eb0..27248f42a03c 100644
--- a/arch/s390/include/asm/thread_info.h
+++ b/arch/s390/include/asm/thread_info.h
@@ -11,19 +11,24 @@
 #include <linux/const.h>
 
 /*
- * Size of kernel stack for each process
+ * General size of kernel stacks
  */
+#ifdef CONFIG_KASAN
+#define THREAD_SIZE_ORDER 3
+#else
 #define THREAD_SIZE_ORDER 2
-#define ASYNC_ORDER  2
-
+#endif
+#define BOOT_STACK_ORDER  2
 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
-#define ASYNC_SIZE  (PAGE_SIZE << ASYNC_ORDER)
 
 #ifndef __ASSEMBLY__
 #include <asm/lowcore.h>
 #include <asm/page.h>
 #include <asm/processor.h>
 
+#define STACK_INIT_OFFSET \
+	(THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs))
+
 /*
  * low level task data that entry.S needs immediate access to
  * - this struct should fit entirely inside of one cache line
diff --git a/arch/s390/include/asm/vmlinux.lds.h b/arch/s390/include/asm/vmlinux.lds.h
new file mode 100644
index 000000000000..2d127f900352
--- /dev/null
+++ b/arch/s390/include/asm/vmlinux.lds.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <asm/page.h>
+
+/*
+ * .boot.data section is shared between the decompressor code and the
+ * decompressed kernel. The decompressor will store values in it, and copy
+ * over to the decompressed image before starting it.
+ *
+ * .boot.data variables are kept in separate .boot.data.<var name> sections,
+ * which are sorted by alignment first, then by name before being merged
+ * into single .boot.data section. This way big holes cased by page aligned
+ * structs are avoided and linker produces consistent result.
+ */
+#define BOOT_DATA							\
+	. = ALIGN(PAGE_SIZE);						\
+	.boot.data : {							\
+		__boot_data_start = .;					\
+		*(SORT_BY_ALIGNMENT(SORT_BY_NAME(.boot.data*)))		\
+		__boot_data_end = .;					\
+	}
diff --git a/arch/s390/include/uapi/asm/pkey.h b/arch/s390/include/uapi/asm/pkey.h
index 6f84a53c3270..c0e86ce4a00b 100644
--- a/arch/s390/include/uapi/asm/pkey.h
+++ b/arch/s390/include/uapi/asm/pkey.h
@@ -21,9 +21,13 @@
 #define PKEY_IOCTL_MAGIC 'p'
 
 #define SECKEYBLOBSIZE	64     /* secure key blob size is always 64 bytes */
+#define PROTKEYBLOBSIZE 80  /* protected key blob size is always 80 bytes */
 #define MAXPROTKEYSIZE	64  /* a protected key blob may be up to 64 bytes */
 #define MAXCLRKEYSIZE	32     /* a clear key value may be up to 32 bytes */
 
+#define MINKEYBLOBSIZE	SECKEYBLOBSIZE	    /* Minimum size of a key blob */
+#define MAXKEYBLOBSIZE	PROTKEYBLOBSIZE     /* Maximum size of a key blob */
+
 /* defines for the type field within the pkey_protkey struct */
 #define PKEY_KEYTYPE_AES_128  1
 #define PKEY_KEYTYPE_AES_192  2
@@ -129,4 +133,34 @@ struct pkey_verifykey {
 #define PKEY_VERIFY_ATTR_AES	   0x00000001  /* key is an AES key */
 #define PKEY_VERIFY_ATTR_OLD_MKVP  0x00000100  /* key has old MKVP value */
 
+/*
+ * Generate (AES) random protected key.
+ */
+struct pkey_genprotk {
+	__u32 keytype;			       /* in: key type to generate */
+	struct pkey_protkey protkey;	       /* out: the protected key   */
+};
+
+#define PKEY_GENPROTK _IOWR(PKEY_IOCTL_MAGIC, 0x08, struct pkey_genprotk)
+
+/*
+ * Verify an (AES) protected key.
+ */
+struct pkey_verifyprotk {
+	struct pkey_protkey protkey;	/* in: the protected key to verify */
+};
+
+#define PKEY_VERIFYPROTK _IOW(PKEY_IOCTL_MAGIC, 0x09, struct pkey_verifyprotk)
+
+/*
+ * Transform an key blob (of any type) into a protected key
+ */
+struct pkey_kblob2pkey {
+	__u8 __user *key;		/* in: the key blob	   */
+	__u32 keylen;			/* in: the key blob length */
+	struct pkey_protkey protkey;	/* out: the protected key  */
+};
+
+#define PKEY_KBLOB2PROTK _IOWR(PKEY_IOCTL_MAGIC, 0x0A, struct pkey_kblob2pkey)
+
 #endif /* _UAPI_PKEY_H */
diff --git a/arch/s390/include/uapi/asm/zcrypt.h b/arch/s390/include/uapi/asm/zcrypt.h
index 2bb1f3bb98ac..42c81a95e97b 100644
--- a/arch/s390/include/uapi/asm/zcrypt.h
+++ b/arch/s390/include/uapi/asm/zcrypt.h
@@ -2,9 +2,9 @@
 /*
  *  include/asm-s390/zcrypt.h
  *
- *  zcrypt 2.1.0 (user-visible header)
+ *  zcrypt 2.2.1 (user-visible header)
  *
- *  Copyright IBM Corp. 2001, 2006
+ *  Copyright IBM Corp. 2001, 2018
  *  Author(s): Robert Burroughs
  *	       Eric Rossman (edrossma@us.ibm.com)
  *
@@ -15,12 +15,15 @@
 #define __ASM_S390_ZCRYPT_H
 
 #define ZCRYPT_VERSION 2
-#define ZCRYPT_RELEASE 1
+#define ZCRYPT_RELEASE 2
 #define ZCRYPT_VARIANT 1
 
 #include <linux/ioctl.h>
 #include <linux/compiler.h>
 
+/* Name of the zcrypt device driver. */
+#define ZCRYPT_NAME "zcrypt"
+
 /**
  * struct ica_rsa_modexpo
  *
@@ -310,6 +313,16 @@ struct zcrypt_device_matrix_ext {
 #define ZCRYPT_PERDEV_REQCNT _IOR(ZCRYPT_IOCTL_MAGIC, 0x5a, int[MAX_ZDEV_CARDIDS_EXT])
 
 /*
+ * Support for multiple zcrypt device nodes.
+ */
+
+/* Nr of minor device node numbers to allocate. */
+#define ZCRYPT_MAX_MINOR_NODES 256
+
+/* Max amount of possible ioctls */
+#define MAX_ZDEV_IOCTLS (1 << _IOC_NRBITS)
+
+/*
  * Only deprecated defines, structs and ioctls below this line.
  */
 
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index dbfd1730e631..386b1abb217b 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -23,6 +23,10 @@ KCOV_INSTRUMENT_early_nobss.o	:= n
 UBSAN_SANITIZE_early.o		:= n
 UBSAN_SANITIZE_early_nobss.o	:= n
 
+KASAN_SANITIZE_early_nobss.o	:= n
+KASAN_SANITIZE_ipl.o		:= n
+KASAN_SANITIZE_machine_kexec.o	:= n
+
 #
 # Passing null pointers is ok for smp code, since we access the lowcore here.
 #
@@ -47,7 +51,7 @@ obj-y	+= debug.o irq.o ipl.o dis.o diag.o vdso.o early_nobss.o
 obj-y	+= sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o
 obj-y	+= runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o sthyi.o
 obj-y	+= entry.o reipl.o relocate_kernel.o kdebugfs.o alternative.o
-obj-y	+= nospec-branch.o
+obj-y	+= nospec-branch.o ipl_vmparm.o
 
 extra-y				+= head64.o vmlinux.lds
 
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index 66e830f1c7bf..164bec175628 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -159,7 +159,7 @@ int main(void)
 	OFFSET(__LC_CURRENT, lowcore, current_task);
 	OFFSET(__LC_KERNEL_STACK, lowcore, kernel_stack);
 	OFFSET(__LC_ASYNC_STACK, lowcore, async_stack);
-	OFFSET(__LC_PANIC_STACK, lowcore, panic_stack);
+	OFFSET(__LC_NODAT_STACK, lowcore, nodat_stack);
 	OFFSET(__LC_RESTART_STACK, lowcore, restart_stack);
 	OFFSET(__LC_RESTART_FN, lowcore, restart_fn);
 	OFFSET(__LC_RESTART_DATA, lowcore, restart_data);
diff --git a/arch/s390/kernel/base.S b/arch/s390/kernel/base.S
index b65874b0b412..f268fca67e82 100644
--- a/arch/s390/kernel/base.S
+++ b/arch/s390/kernel/base.S
@@ -18,7 +18,7 @@
 
 ENTRY(s390_base_mcck_handler)
 	basr	%r13,0
-0:	lg	%r15,__LC_PANIC_STACK	# load panic stack
+0:	lg	%r15,__LC_NODAT_STACK	# load panic stack
 	aghi	%r15,-STACK_FRAME_OVERHEAD
 	larl	%r1,s390_base_mcck_handler_fn
 	lg	%r9,0(%r1)
diff --git a/arch/s390/kernel/dumpstack.c b/arch/s390/kernel/dumpstack.c
index 5b23c4f6e50c..cb7f55bbe06e 100644
--- a/arch/s390/kernel/dumpstack.c
+++ b/arch/s390/kernel/dumpstack.c
@@ -30,7 +30,7 @@
  * The stack trace can start at any of the three stacks and can potentially
  * touch all of them. The order is: panic stack, async stack, sync stack.
  */
-static unsigned long
+static unsigned long __no_sanitize_address
 __dump_trace(dump_trace_func_t func, void *data, unsigned long sp,
 	     unsigned long low, unsigned long high)
 {
@@ -77,11 +77,11 @@ void dump_trace(dump_trace_func_t func, void *data, struct task_struct *task,
 	frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
 #ifdef CONFIG_CHECK_STACK
 	sp = __dump_trace(func, data, sp,
-			  S390_lowcore.panic_stack + frame_size - PAGE_SIZE,
-			  S390_lowcore.panic_stack + frame_size);
+			  S390_lowcore.nodat_stack + frame_size - THREAD_SIZE,
+			  S390_lowcore.nodat_stack + frame_size);
 #endif
 	sp = __dump_trace(func, data, sp,
-			  S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
+			  S390_lowcore.async_stack + frame_size - THREAD_SIZE,
 			  S390_lowcore.async_stack + frame_size);
 	task = task ?: current;
 	__dump_trace(func, data, sp,
@@ -124,7 +124,7 @@ void show_registers(struct pt_regs *regs)
 	char *mode;
 
 	mode = user_mode(regs) ? "User" : "Krnl";
-	printk("%s PSW : %p %p", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
+	printk("%s PSW : %px %px", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
 	if (!user_mode(regs))
 		pr_cont(" (%pSR)", (void *)regs->psw.addr);
 	pr_cont("\n");
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 5b28b434f8a1..af5c2b3f7065 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -29,10 +29,9 @@
 #include <asm/cpcmd.h>
 #include <asm/sclp.h>
 #include <asm/facility.h>
+#include <asm/boot_data.h>
 #include "entry.h"
 
-static void __init setup_boot_command_line(void);
-
 /*
  * Initialize storage key for kernel pages
  */
@@ -284,51 +283,11 @@ static int __init cad_setup(char *str)
 }
 early_param("cad", cad_setup);
 
-/* Set up boot command line */
-static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
-{
-	char *parm, *delim;
-	size_t rc, len;
-
-	len = strlen(boot_command_line);
-
-	delim = boot_command_line + len;	/* '\0' character position */
-	parm  = boot_command_line + len + 1;	/* append right after '\0' */
-
-	rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
-	if (rc) {
-		if (*parm == '=')
-			memmove(boot_command_line, parm + 1, rc);
-		else
-			*delim = ' ';		/* replace '\0' with space */
-	}
-}
-
-static inline int has_ebcdic_char(const char *str)
-{
-	int i;
-
-	for (i = 0; str[i]; i++)
-		if (str[i] & 0x80)
-			return 1;
-	return 0;
-}
-
+char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
 static void __init setup_boot_command_line(void)
 {
-	COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
-	/* convert arch command line to ascii if necessary */
-	if (has_ebcdic_char(COMMAND_LINE))
-		EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
 	/* copy arch command line */
-	strlcpy(boot_command_line, strstrip(COMMAND_LINE),
-		ARCH_COMMAND_LINE_SIZE);
-
-	/* append IPL PARM data to the boot command line */
-	if (MACHINE_IS_VM)
-		append_to_cmdline(append_ipl_vmparm);
-
-	append_to_cmdline(append_ipl_scpdata);
+	strlcpy(boot_command_line, early_command_line, ARCH_COMMAND_LINE_SIZE);
 }
 
 static void __init check_image_bootable(void)
diff --git a/arch/s390/kernel/early_nobss.c b/arch/s390/kernel/early_nobss.c
index 2d84fc48df3a..8d73f7fae16e 100644
--- a/arch/s390/kernel/early_nobss.c
+++ b/arch/s390/kernel/early_nobss.c
@@ -13,8 +13,8 @@
 #include <linux/string.h>
 #include <asm/sections.h>
 #include <asm/lowcore.h>
-#include <asm/setup.h>
 #include <asm/timex.h>
+#include <asm/kasan.h>
 #include "entry.h"
 
 static void __init reset_tod_clock(void)
@@ -32,26 +32,6 @@ static void __init reset_tod_clock(void)
 	S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
 }
 
-static void __init rescue_initrd(void)
-{
-	unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
-
-	/*
-	 * Just like in case of IPL from VM reader we make sure there is a
-	 * gap of 4MB between end of kernel and start of initrd.
-	 * That way we can also be sure that saving an NSS will succeed,
-	 * which however only requires different segments.
-	 */
-	if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD))
-		return;
-	if (!INITRD_START || !INITRD_SIZE)
-		return;
-	if (INITRD_START >= min_initrd_addr)
-		return;
-	memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
-	INITRD_START = min_initrd_addr;
-}
-
 static void __init clear_bss_section(void)
 {
 	memset(__bss_start, 0, __bss_stop - __bss_start);
@@ -60,6 +40,6 @@ static void __init clear_bss_section(void)
 void __init startup_init_nobss(void)
 {
 	reset_tod_clock();
-	rescue_initrd();
 	clear_bss_section();
+	kasan_early_init();
 }
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 150130c897c3..724fba4d09d2 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -85,14 +85,34 @@ _LPP_OFFSET	= __LC_LPP
 #endif
 	.endm
 
-	.macro	CHECK_STACK stacksize,savearea
+	.macro	CHECK_STACK savearea
 #ifdef CONFIG_CHECK_STACK
-	tml	%r15,\stacksize - CONFIG_STACK_GUARD
+	tml	%r15,STACK_SIZE - CONFIG_STACK_GUARD
 	lghi	%r14,\savearea
 	jz	stack_overflow
 #endif
 	.endm
 
+	.macro	CHECK_VMAP_STACK savearea,oklabel
+#ifdef CONFIG_VMAP_STACK
+	lgr	%r14,%r15
+	nill	%r14,0x10000 - STACK_SIZE
+	oill	%r14,STACK_INIT
+	clg	%r14,__LC_KERNEL_STACK
+	je	\oklabel
+	clg	%r14,__LC_ASYNC_STACK
+	je	\oklabel
+	clg	%r14,__LC_NODAT_STACK
+	je	\oklabel
+	clg	%r14,__LC_RESTART_STACK
+	je	\oklabel
+	lghi	%r14,\savearea
+	j	stack_overflow
+#else
+	j	\oklabel
+#endif
+	.endm
+
 	.macro	SWITCH_ASYNC savearea,timer
 	tmhh	%r8,0x0001		# interrupting from user ?
 	jnz	1f
@@ -104,11 +124,11 @@ _LPP_OFFSET	= __LC_LPP
 	brasl	%r14,cleanup_critical
 	tmhh	%r8,0x0001		# retest problem state after cleanup
 	jnz	1f
-0:	lg	%r14,__LC_ASYNC_STACK	# are we already on the async stack?
+0:	lg	%r14,__LC_ASYNC_STACK	# are we already on the target stack?
 	slgr	%r14,%r15
 	srag	%r14,%r14,STACK_SHIFT
 	jnz	2f
-	CHECK_STACK 1<<STACK_SHIFT,\savearea
+	CHECK_STACK \savearea
 	aghi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
 	j	3f
 1:	UPDATE_VTIME %r14,%r15,\timer
@@ -600,9 +620,10 @@ ENTRY(pgm_check_handler)
 	jnz	1f			# -> enabled, can't be a double fault
 	tm	__LC_PGM_ILC+3,0x80	# check for per exception
 	jnz	.Lpgm_svcper		# -> single stepped svc
-1:	CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC
+1:	CHECK_STACK __LC_SAVE_AREA_SYNC
 	aghi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
-	j	4f
+	# CHECK_VMAP_STACK branches to stack_overflow or 4f
+	CHECK_VMAP_STACK __LC_SAVE_AREA_SYNC,4f
 2:	UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER
 	BPENTER __TI_flags(%r12),_TIF_ISOLATE_BP
 	lg	%r15,__LC_KERNEL_STACK
@@ -1136,7 +1157,8 @@ ENTRY(mcck_int_handler)
 	jnz	4f
 	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_PSW_IA_VALID
 	jno	.Lmcck_panic
-4:	SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_MCCK_ENTER_TIMER
+4:	ssm	__LC_PGM_NEW_PSW	# turn dat on, keep irqs off
+	SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_MCCK_ENTER_TIMER
 .Lmcck_skip:
 	lghi	%r14,__LC_GPREGS_SAVE_AREA+64
 	stmg	%r0,%r7,__PT_R0(%r11)
@@ -1163,7 +1185,6 @@ ENTRY(mcck_int_handler)
 	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
 	la	%r11,STACK_FRAME_OVERHEAD(%r1)
 	lgr	%r15,%r1
-	ssm	__LC_PGM_NEW_PSW	# turn dat on, keep irqs off
 	TSTMSK	__LC_CPU_FLAGS,_CIF_MCCK_PENDING
 	jno	.Lmcck_return
 	TRACE_IRQS_OFF
@@ -1182,7 +1203,7 @@ ENTRY(mcck_int_handler)
 	lpswe	__LC_RETURN_MCCK_PSW
 
 .Lmcck_panic:
-	lg	%r15,__LC_PANIC_STACK
+	lg	%r15,__LC_NODAT_STACK
 	la	%r11,STACK_FRAME_OVERHEAD(%r15)
 	j	.Lmcck_skip
 
@@ -1193,12 +1214,10 @@ ENTRY(restart_int_handler)
 	ALTERNATIVE "", ".insn s,0xb2800000,_LPP_OFFSET", 40
 	stg	%r15,__LC_SAVE_AREA_RESTART
 	lg	%r15,__LC_RESTART_STACK
-	aghi	%r15,-__PT_SIZE			# create pt_regs on stack
-	xc	0(__PT_SIZE,%r15),0(%r15)
-	stmg	%r0,%r14,__PT_R0(%r15)
-	mvc	__PT_R15(8,%r15),__LC_SAVE_AREA_RESTART
-	mvc	__PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw
-	aghi	%r15,-STACK_FRAME_OVERHEAD	# create stack frame on stack
+	xc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r15),STACK_FRAME_OVERHEAD(%r15)
+	stmg	%r0,%r14,STACK_FRAME_OVERHEAD+__PT_R0(%r15)
+	mvc	STACK_FRAME_OVERHEAD+__PT_R15(8,%r15),__LC_SAVE_AREA_RESTART
+	mvc	STACK_FRAME_OVERHEAD+__PT_PSW(16,%r15),__LC_RST_OLD_PSW
 	xc	0(STACK_FRAME_OVERHEAD,%r15),0(%r15)
 	lg	%r1,__LC_RESTART_FN		# load fn, parm & source cpu
 	lg	%r2,__LC_RESTART_DATA
@@ -1216,14 +1235,14 @@ ENTRY(restart_int_handler)
 
 	.section .kprobes.text, "ax"
 
-#ifdef CONFIG_CHECK_STACK
+#if defined(CONFIG_CHECK_STACK) || defined(CONFIG_VMAP_STACK)
 /*
  * The synchronous or the asynchronous stack overflowed. We are dead.
  * No need to properly save the registers, we are going to panic anyway.
  * Setup a pt_regs so that show_trace can provide a good call trace.
  */
 stack_overflow:
-	lg	%r15,__LC_PANIC_STACK	# change to panic stack
+	lg	%r15,__LC_NODAT_STACK	# change to panic stack
 	la	%r11,STACK_FRAME_OVERHEAD(%r15)
 	stmg	%r0,%r7,__PT_R0(%r11)
 	stmg	%r8,%r9,__PT_PSW(%r11)
diff --git a/arch/s390/kernel/entry.h b/arch/s390/kernel/entry.h
index 472fa2f1a4a5..c3816ae108b0 100644
--- a/arch/s390/kernel/entry.h
+++ b/arch/s390/kernel/entry.h
@@ -86,4 +86,7 @@ DECLARE_PER_CPU(u64, mt_cycles[8]);
 void gs_load_bc_cb(struct pt_regs *regs);
 void set_fs_fixup(void);
 
+unsigned long stack_alloc(void);
+void stack_free(unsigned long stack);
+
 #endif /* _ENTRY_H */
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index 6d14ad42ba88..57bba24b1c27 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -14,6 +14,7 @@
 #include <asm/asm-offsets.h>
 #include <asm/thread_info.h>
 #include <asm/page.h>
+#include <asm/ptrace.h>
 
 __HEAD
 ENTRY(startup_continue)
@@ -35,10 +36,7 @@ ENTRY(startup_continue)
 #
 	larl	%r14,init_task
 	stg	%r14,__LC_CURRENT
-	larl	%r15,init_thread_union
-	aghi	%r15,1<<(PAGE_SHIFT+THREAD_SIZE_ORDER) # init_task_union + THREAD_SIZE
-	stg	%r15,__LC_KERNEL_STACK	# set end of kernel stack
-	aghi	%r15,-160
+	larl	%r15,init_thread_union+THREAD_SIZE-STACK_FRAME_OVERHEAD
 #
 # Early setup functions that may not rely on an initialized bss section,
 # like moving the initrd. Returns with an initialized bss section.
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 4296d7e61fb6..18a5d6317acc 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -29,6 +29,8 @@
 #include <asm/checksum.h>
 #include <asm/debug.h>
 #include <asm/os_info.h>
+#include <asm/sections.h>
+#include <asm/boot_data.h>
 #include "entry.h"
 
 #define IPL_PARM_BLOCK_VERSION 0
@@ -117,6 +119,9 @@ static char *dump_type_str(enum dump_type type)
 	}
 }
 
+struct ipl_parameter_block __bootdata(early_ipl_block);
+int __bootdata(early_ipl_block_valid);
+
 static int ipl_block_valid;
 static struct ipl_parameter_block ipl_block;
 
@@ -151,6 +156,8 @@ static inline int __diag308(unsigned long subcode, void *addr)
 
 int diag308(unsigned long subcode, void *addr)
 {
+	if (IS_ENABLED(CONFIG_KASAN))
+		__arch_local_irq_stosm(0x04); /* enable DAT */
 	diag_stat_inc(DIAG_STAT_X308);
 	return __diag308(subcode, addr);
 }
@@ -262,115 +269,16 @@ static ssize_t ipl_type_show(struct kobject *kobj, struct kobj_attribute *attr,
 
 static struct kobj_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
 
-/* VM IPL PARM routines */
-static size_t reipl_get_ascii_vmparm(char *dest, size_t size,
-				     const struct ipl_parameter_block *ipb)
-{
-	int i;
-	size_t len;
-	char has_lowercase = 0;
-
-	len = 0;
-	if ((ipb->ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID) &&
-	    (ipb->ipl_info.ccw.vm_parm_len > 0)) {
-
-		len = min_t(size_t, size - 1, ipb->ipl_info.ccw.vm_parm_len);
-		memcpy(dest, ipb->ipl_info.ccw.vm_parm, len);
-		/* If at least one character is lowercase, we assume mixed
-		 * case; otherwise we convert everything to lowercase.
-		 */
-		for (i = 0; i < len; i++)
-			if ((dest[i] > 0x80 && dest[i] < 0x8a) || /* a-i */
-			    (dest[i] > 0x90 && dest[i] < 0x9a) || /* j-r */
-			    (dest[i] > 0xa1 && dest[i] < 0xaa)) { /* s-z */
-				has_lowercase = 1;
-				break;
-			}
-		if (!has_lowercase)
-			EBC_TOLOWER(dest, len);
-		EBCASC(dest, len);
-	}
-	dest[len] = 0;
-
-	return len;
-}
-
-size_t append_ipl_vmparm(char *dest, size_t size)
-{
-	size_t rc;
-
-	rc = 0;
-	if (ipl_block_valid && ipl_block.hdr.pbt == DIAG308_IPL_TYPE_CCW)
-		rc = reipl_get_ascii_vmparm(dest, size, &ipl_block);
-	else
-		dest[0] = 0;
-	return rc;
-}
-
 static ssize_t ipl_vm_parm_show(struct kobject *kobj,
 				struct kobj_attribute *attr, char *page)
 {
 	char parm[DIAG308_VMPARM_SIZE + 1] = {};
 
-	append_ipl_vmparm(parm, sizeof(parm));
+	if (ipl_block_valid && (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_CCW))
+		ipl_block_get_ascii_vmparm(parm, sizeof(parm), &ipl_block);
 	return sprintf(page, "%s\n", parm);
 }
 
-static size_t scpdata_length(const char* buf, size_t count)
-{
-	while (count) {
-		if (buf[count - 1] != '\0' && buf[count - 1] != ' ')
-			break;
-		count--;
-	}
-	return count;
-}
-
-static size_t reipl_append_ascii_scpdata(char *dest, size_t size,
-					 const struct ipl_parameter_block *ipb)
-{
-	size_t count;
-	size_t i;
-	int has_lowercase;
-
-	count = min(size - 1, scpdata_length(ipb->ipl_info.fcp.scp_data,
-					     ipb->ipl_info.fcp.scp_data_len));
-	if (!count)
-		goto out;
-
-	has_lowercase = 0;
-	for (i = 0; i < count; i++) {
-		if (!isascii(ipb->ipl_info.fcp.scp_data[i])) {
-			count = 0;
-			goto out;
-		}
-		if (!has_lowercase && islower(ipb->ipl_info.fcp.scp_data[i]))
-			has_lowercase = 1;
-	}
-
-	if (has_lowercase)
-		memcpy(dest, ipb->ipl_info.fcp.scp_data, count);
-	else
-		for (i = 0; i < count; i++)
-			dest[i] = tolower(ipb->ipl_info.fcp.scp_data[i]);
-out:
-	dest[count] = '\0';
-	return count;
-}
-
-size_t append_ipl_scpdata(char *dest, size_t len)
-{
-	size_t rc;
-
-	rc = 0;
-	if (ipl_block_valid && ipl_block.hdr.pbt == DIAG308_IPL_TYPE_FCP)
-		rc = reipl_append_ascii_scpdata(dest, len, &ipl_block);
-	else
-		dest[0] = 0;
-	return rc;
-}
-
-
 static struct kobj_attribute sys_ipl_vm_parm_attr =
 	__ATTR(parm, S_IRUGO, ipl_vm_parm_show, NULL);
 
@@ -564,7 +472,7 @@ static ssize_t reipl_generic_vmparm_show(struct ipl_parameter_block *ipb,
 {
 	char vmparm[DIAG308_VMPARM_SIZE + 1] = {};
 
-	reipl_get_ascii_vmparm(vmparm, sizeof(vmparm), ipb);
+	ipl_block_get_ascii_vmparm(vmparm, sizeof(vmparm), ipb);
 	return sprintf(page, "%s\n", vmparm);
 }
 
@@ -1769,11 +1677,10 @@ void __init setup_ipl(void)
 
 void __init ipl_store_parameters(void)
 {
-	int rc;
-
-	rc = diag308(DIAG308_STORE, &ipl_block);
-	if (rc == DIAG308_RC_OK && ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION)
+	if (early_ipl_block_valid) {
+		memcpy(&ipl_block, &early_ipl_block, sizeof(ipl_block));
 		ipl_block_valid = 1;
+	}
 }
 
 void s390_reset_system(void)
diff --git a/arch/s390/kernel/ipl_vmparm.c b/arch/s390/kernel/ipl_vmparm.c
new file mode 100644
index 000000000000..411838c0a0af
--- /dev/null
+++ b/arch/s390/kernel/ipl_vmparm.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <asm/ebcdic.h>
+#include <asm/ipl.h>
+
+/* VM IPL PARM routines */
+size_t ipl_block_get_ascii_vmparm(char *dest, size_t size,
+				  const struct ipl_parameter_block *ipb)
+{
+	int i;
+	size_t len;
+	char has_lowercase = 0;
+
+	len = 0;
+	if ((ipb->ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID) &&
+	    (ipb->ipl_info.ccw.vm_parm_len > 0)) {
+
+		len = min_t(size_t, size - 1, ipb->ipl_info.ccw.vm_parm_len);
+		memcpy(dest, ipb->ipl_info.ccw.vm_parm, len);
+		/* If at least one character is lowercase, we assume mixed
+		 * case; otherwise we convert everything to lowercase.
+		 */
+		for (i = 0; i < len; i++)
+			if ((dest[i] > 0x80 && dest[i] < 0x8a) || /* a-i */
+			    (dest[i] > 0x90 && dest[i] < 0x9a) || /* j-r */
+			    (dest[i] > 0xa1 && dest[i] < 0xaa)) { /* s-z */
+				has_lowercase = 1;
+				break;
+			}
+		if (!has_lowercase)
+			EBC_TOLOWER(dest, len);
+		EBCASC(dest, len);
+	}
+	dest[len] = 0;
+
+	return len;
+}
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index 3d17c41074ca..0e8d68bac82c 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -172,15 +172,7 @@ void do_softirq_own_stack(void)
 	/* Check against async. stack address range. */
 	new = S390_lowcore.async_stack;
 	if (((new - old) >> (PAGE_SHIFT + THREAD_SIZE_ORDER)) != 0) {
-		/* Need to switch to the async. stack. */
-		new -= STACK_FRAME_OVERHEAD;
-		((struct stack_frame *) new)->back_chain = old;
-		asm volatile("   la    15,0(%0)\n"
-			     "   brasl 14,__do_softirq\n"
-			     "   la    15,0(%1)\n"
-			     : : "a" (new), "a" (old)
-			     : "0", "1", "2", "3", "4", "5", "14",
-			       "cc", "memory" );
+		CALL_ON_STACK(__do_softirq, new, 0);
 	} else {
 		/* We are already on the async stack. */
 		__do_softirq();
diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c
index b7020e721ae3..cb582649aba6 100644
--- a/arch/s390/kernel/machine_kexec.c
+++ b/arch/s390/kernel/machine_kexec.c
@@ -142,18 +142,27 @@ static noinline void __machine_kdump(void *image)
 }
 #endif
 
+static unsigned long do_start_kdump(unsigned long addr)
+{
+	struct kimage *image = (struct kimage *) addr;
+	int (*start_kdump)(int) = (void *)image->start;
+	int rc;
+
+	__arch_local_irq_stnsm(0xfb); /* disable DAT */
+	rc = start_kdump(0);
+	__arch_local_irq_stosm(0x04); /* enable DAT */
+	return rc;
+}
+
 /*
  * Check if kdump checksums are valid: We call purgatory with parameter "0"
  */
 static bool kdump_csum_valid(struct kimage *image)
 {
 #ifdef CONFIG_CRASH_DUMP
-	int (*start_kdump)(int) = (void *)image->start;
 	int rc;
 
-	__arch_local_irq_stnsm(0xfb); /* disable DAT */
-	rc = start_kdump(0);
-	__arch_local_irq_stosm(0x04); /* enable DAT */
+	rc = CALL_ON_STACK(do_start_kdump, S390_lowcore.nodat_stack, 1, image);
 	return rc == 0;
 #else
 	return false;
diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c
index d298d3cb46d0..31889db609e9 100644
--- a/arch/s390/kernel/module.c
+++ b/arch/s390/kernel/module.c
@@ -16,6 +16,7 @@
 #include <linux/fs.h>
 #include <linux/string.h>
 #include <linux/kernel.h>
+#include <linux/kasan.h>
 #include <linux/moduleloader.h>
 #include <linux/bug.h>
 #include <asm/alternative.h>
@@ -32,12 +33,18 @@
 
 void *module_alloc(unsigned long size)
 {
+	void *p;
+
 	if (PAGE_ALIGN(size) > MODULES_LEN)
 		return NULL;
-	return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
-				    GFP_KERNEL, PAGE_KERNEL_EXEC,
-				    0, NUMA_NO_NODE,
-				    __builtin_return_address(0));
+	p = __vmalloc_node_range(size, MODULE_ALIGN, MODULES_VADDR, MODULES_END,
+				 GFP_KERNEL, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
+				 __builtin_return_address(0));
+	if (p && (kasan_module_alloc(p, size) < 0)) {
+		vfree(p);
+		return NULL;
+	}
+	return p;
 }
 
 void module_arch_freeing_init(struct module *mod)
diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c
index 5c53e977be62..7bf604ff50a1 100644
--- a/arch/s390/kernel/perf_cpum_sf.c
+++ b/arch/s390/kernel/perf_cpum_sf.c
@@ -2045,14 +2045,17 @@ static int __init init_cpum_sampling_pmu(void)
 	}
 
 	sfdbg = debug_register(KMSG_COMPONENT, 2, 1, 80);
-	if (!sfdbg)
+	if (!sfdbg) {
 		pr_err("Registering for s390dbf failed\n");
+		return -ENOMEM;
+	}
 	debug_register_view(sfdbg, &debug_sprintf_view);
 
 	err = register_external_irq(EXT_IRQ_MEASURE_ALERT,
 				    cpumf_measurement_alert);
 	if (err) {
 		pr_cpumsf_err(RS_INIT_FAILURE_ALRT);
+		debug_unregister(sfdbg);
 		goto out;
 	}
 
@@ -2061,6 +2064,7 @@ static int __init init_cpum_sampling_pmu(void)
 		pr_cpumsf_err(RS_INIT_FAILURE_PERF);
 		unregister_external_irq(EXT_IRQ_MEASURE_ALERT,
 					cpumf_measurement_alert);
+		debug_unregister(sfdbg);
 		goto out;
 	}
 
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index c637c12f9e37..a2e952b66248 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -49,6 +49,7 @@
 #include <linux/crash_dump.h>
 #include <linux/memory.h>
 #include <linux/compat.h>
+#include <linux/start_kernel.h>
 
 #include <asm/ipl.h>
 #include <asm/facility.h>
@@ -69,6 +70,7 @@
 #include <asm/numa.h>
 #include <asm/alternative.h>
 #include <asm/nospec-branch.h>
+#include <asm/mem_detect.h>
 #include "entry.h"
 
 /*
@@ -88,9 +90,11 @@ char elf_platform[ELF_PLATFORM_SIZE];
 
 unsigned long int_hwcap = 0;
 
-int __initdata memory_end_set;
-unsigned long __initdata memory_end;
-unsigned long __initdata max_physmem_end;
+int __bootdata(noexec_disabled);
+int __bootdata(memory_end_set);
+unsigned long __bootdata(memory_end);
+unsigned long __bootdata(max_physmem_end);
+struct mem_detect_info __bootdata(mem_detect);
 
 unsigned long VMALLOC_START;
 EXPORT_SYMBOL(VMALLOC_START);
@@ -283,15 +287,6 @@ void machine_power_off(void)
 void (*pm_power_off)(void) = machine_power_off;
 EXPORT_SYMBOL_GPL(pm_power_off);
 
-static int __init early_parse_mem(char *p)
-{
-	memory_end = memparse(p, &p);
-	memory_end &= PAGE_MASK;
-	memory_end_set = 1;
-	return 0;
-}
-early_param("mem", early_parse_mem);
-
 static int __init parse_vmalloc(char *arg)
 {
 	if (!arg)
@@ -303,6 +298,78 @@ early_param("vmalloc", parse_vmalloc);
 
 void *restart_stack __section(.data);
 
+unsigned long stack_alloc(void)
+{
+#ifdef CONFIG_VMAP_STACK
+	return (unsigned long)
+		__vmalloc_node_range(THREAD_SIZE, THREAD_SIZE,
+				     VMALLOC_START, VMALLOC_END,
+				     THREADINFO_GFP,
+				     PAGE_KERNEL, 0, NUMA_NO_NODE,
+				     __builtin_return_address(0));
+#else
+	return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
+#endif
+}
+
+void stack_free(unsigned long stack)
+{
+#ifdef CONFIG_VMAP_STACK
+	vfree((void *) stack);
+#else
+	free_pages(stack, THREAD_SIZE_ORDER);
+#endif
+}
+
+int __init arch_early_irq_init(void)
+{
+	unsigned long stack;
+
+	stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
+	if (!stack)
+		panic("Couldn't allocate async stack");
+	S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
+	return 0;
+}
+
+static int __init async_stack_realloc(void)
+{
+	unsigned long old, new;
+
+	old = S390_lowcore.async_stack - STACK_INIT_OFFSET;
+	new = stack_alloc();
+	if (!new)
+		panic("Couldn't allocate async stack");
+	S390_lowcore.async_stack = new + STACK_INIT_OFFSET;
+	free_pages(old, THREAD_SIZE_ORDER);
+	return 0;
+}
+early_initcall(async_stack_realloc);
+
+void __init arch_call_rest_init(void)
+{
+	struct stack_frame *frame;
+	unsigned long stack;
+
+	stack = stack_alloc();
+	if (!stack)
+		panic("Couldn't allocate kernel stack");
+	current->stack = (void *) stack;
+#ifdef CONFIG_VMAP_STACK
+	current->stack_vm_area = (void *) stack;
+#endif
+	set_task_stack_end_magic(current);
+	stack += STACK_INIT_OFFSET;
+	S390_lowcore.kernel_stack = stack;
+	frame = (struct stack_frame *) stack;
+	memset(frame, 0, sizeof(*frame));
+	/* Branch to rest_init on the new stack, never returns */
+	asm volatile(
+		"	la	15,0(%[_frame])\n"
+		"	jg	rest_init\n"
+		: : [_frame] "a" (frame));
+}
+
 static void __init setup_lowcore(void)
 {
 	struct lowcore *lc;
@@ -329,14 +396,8 @@ static void __init setup_lowcore(void)
 		PSW_MASK_DAT | PSW_MASK_MCHECK;
 	lc->io_new_psw.addr = (unsigned long) io_int_handler;
 	lc->clock_comparator = clock_comparator_max;
-	lc->kernel_stack = ((unsigned long) &init_thread_union)
+	lc->nodat_stack = ((unsigned long) &init_thread_union)
 		+ THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
-	lc->async_stack = (unsigned long)
-		memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE)
-		+ ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
-	lc->panic_stack = (unsigned long)
-		memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE)
-		+ PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
 	lc->current_task = (unsigned long)&init_task;
 	lc->lpp = LPP_MAGIC;
 	lc->machine_flags = S390_lowcore.machine_flags;
@@ -357,8 +418,12 @@ static void __init setup_lowcore(void)
 	lc->last_update_timer = S390_lowcore.last_update_timer;
 	lc->last_update_clock = S390_lowcore.last_update_clock;
 
-	restart_stack = memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE);
-	restart_stack += ASYNC_SIZE;
+	/*
+	 * Allocate the global restart stack which is the same for
+	 * all CPUs in cast *one* of them does a PSW restart.
+	 */
+	restart_stack = memblock_virt_alloc(THREAD_SIZE, THREAD_SIZE);
+	restart_stack += STACK_INIT_OFFSET;
 
 	/*
 	 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
@@ -467,19 +532,26 @@ static void __init setup_memory_end(void)
 {
 	unsigned long vmax, vmalloc_size, tmp;
 
-	/* Choose kernel address space layout: 2, 3, or 4 levels. */
+	/* Choose kernel address space layout: 3 or 4 levels. */
 	vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
-	tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
-	tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
-	if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE)
-		vmax = _REGION2_SIZE; /* 3-level kernel page table */
-	else
-		vmax = _REGION1_SIZE; /* 4-level kernel page table */
+	if (IS_ENABLED(CONFIG_KASAN)) {
+		vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)
+			   ? _REGION1_SIZE
+			   : _REGION2_SIZE;
+	} else {
+		tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
+		tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
+		if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE)
+			vmax = _REGION2_SIZE; /* 3-level kernel page table */
+		else
+			vmax = _REGION1_SIZE; /* 4-level kernel page table */
+	}
+
 	/* module area is at the end of the kernel address space. */
 	MODULES_END = vmax;
 	MODULES_VADDR = MODULES_END - MODULES_LEN;
 	VMALLOC_END = MODULES_VADDR;
-	VMALLOC_START = vmax - vmalloc_size;
+	VMALLOC_START = VMALLOC_END - vmalloc_size;
 
 	/* Split remaining virtual space between 1:1 mapping & vmemmap array */
 	tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
@@ -491,7 +563,12 @@ static void __init setup_memory_end(void)
 	vmemmap = (struct page *) tmp;
 
 	/* Take care that memory_end is set and <= vmemmap */
-	memory_end = min(memory_end ?: max_physmem_end, tmp);
+	memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap);
+#ifdef CONFIG_KASAN
+	/* fit in kasan shadow memory region between 1:1 and vmemmap */
+	memory_end = min(memory_end, KASAN_SHADOW_START);
+	vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END);
+#endif
 	max_pfn = max_low_pfn = PFN_DOWN(memory_end);
 	memblock_remove(memory_end, ULONG_MAX);
 
@@ -532,17 +609,8 @@ static struct notifier_block kdump_mem_nb = {
  */
 static void reserve_memory_end(void)
 {
-#ifdef CONFIG_CRASH_DUMP
-	if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
-	    !OLDMEM_BASE && sclp.hsa_size) {
-		memory_end = sclp.hsa_size;
-		memory_end &= PAGE_MASK;
-		memory_end_set = 1;
-	}
-#endif
-	if (!memory_end_set)
-		return;
-	memblock_reserve(memory_end, ULONG_MAX);
+	if (memory_end_set)
+		memblock_reserve(memory_end, ULONG_MAX);
 }
 
 /*
@@ -649,6 +717,62 @@ static void __init reserve_initrd(void)
 #endif
 }
 
+static void __init reserve_mem_detect_info(void)
+{
+	unsigned long start, size;
+
+	get_mem_detect_reserved(&start, &size);
+	if (size)
+		memblock_reserve(start, size);
+}
+
+static void __init free_mem_detect_info(void)
+{
+	unsigned long start, size;
+
+	get_mem_detect_reserved(&start, &size);
+	if (size)
+		memblock_free(start, size);
+}
+
+static void __init memblock_physmem_add(phys_addr_t start, phys_addr_t size)
+{
+	memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n",
+		     start, start + size - 1);
+	memblock_add_range(&memblock.memory, start, size, 0, 0);
+	memblock_add_range(&memblock.physmem, start, size, 0, 0);
+}
+
+static const char * __init get_mem_info_source(void)
+{
+	switch (mem_detect.info_source) {
+	case MEM_DETECT_SCLP_STOR_INFO:
+		return "sclp storage info";
+	case MEM_DETECT_DIAG260:
+		return "diag260";
+	case MEM_DETECT_SCLP_READ_INFO:
+		return "sclp read info";
+	case MEM_DETECT_BIN_SEARCH:
+		return "binary search";
+	}
+	return "none";
+}
+
+static void __init memblock_add_mem_detect_info(void)
+{
+	unsigned long start, end;
+	int i;
+
+	memblock_dbg("physmem info source: %s (%hhd)\n",
+		     get_mem_info_source(), mem_detect.info_source);
+	/* keep memblock lists close to the kernel */
+	memblock_set_bottom_up(true);
+	for_each_mem_detect_block(i, &start, &end)
+		memblock_physmem_add(start, end - start);
+	memblock_set_bottom_up(false);
+	memblock_dump_all();
+}
+
 /*
  * Check for initrd being in usable memory
  */
@@ -913,11 +1037,13 @@ void __init setup_arch(char **cmdline_p)
 	reserve_oldmem();
 	reserve_kernel();
 	reserve_initrd();
+	reserve_mem_detect_info();
 	memblock_allow_resize();
 
 	/* Get information about *all* installed memory */
-	detect_memory_memblock();
+	memblock_add_mem_detect_info();
 
+	free_mem_detect_info();
 	remove_oldmem();
 
 	/*
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 2f8f7d7dd9a8..1b3188f57b58 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -186,36 +186,34 @@ static void pcpu_ec_call(struct pcpu *pcpu, int ec_bit)
 	pcpu_sigp_retry(pcpu, order, 0);
 }
 
-#define ASYNC_FRAME_OFFSET (ASYNC_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE)
-#define PANIC_FRAME_OFFSET (PAGE_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE)
-
 static int pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu)
 {
-	unsigned long async_stack, panic_stack;
+	unsigned long async_stack, nodat_stack;
 	struct lowcore *lc;
 
 	if (pcpu != &pcpu_devices[0]) {
 		pcpu->lowcore =	(struct lowcore *)
 			__get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER);
-		async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER);
-		panic_stack = __get_free_page(GFP_KERNEL);
-		if (!pcpu->lowcore || !panic_stack || !async_stack)
+		nodat_stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
+		if (!pcpu->lowcore || !nodat_stack)
 			goto out;
 	} else {
-		async_stack = pcpu->lowcore->async_stack - ASYNC_FRAME_OFFSET;
-		panic_stack = pcpu->lowcore->panic_stack - PANIC_FRAME_OFFSET;
+		nodat_stack = pcpu->lowcore->nodat_stack - STACK_INIT_OFFSET;
 	}
+	async_stack = stack_alloc();
+	if (!async_stack)
+		goto out;
 	lc = pcpu->lowcore;
 	memcpy(lc, &S390_lowcore, 512);
 	memset((char *) lc + 512, 0, sizeof(*lc) - 512);
-	lc->async_stack = async_stack + ASYNC_FRAME_OFFSET;
-	lc->panic_stack = panic_stack + PANIC_FRAME_OFFSET;
+	lc->async_stack = async_stack + STACK_INIT_OFFSET;
+	lc->nodat_stack = nodat_stack + STACK_INIT_OFFSET;
 	lc->cpu_nr = cpu;
 	lc->spinlock_lockval = arch_spin_lockval(cpu);
 	lc->spinlock_index = 0;
 	lc->br_r1_trampoline = 0x07f1;	/* br %r1 */
 	if (nmi_alloc_per_cpu(lc))
-		goto out;
+		goto out_async;
 	if (vdso_alloc_per_cpu(lc))
 		goto out_mcesa;
 	lowcore_ptr[cpu] = lc;
@@ -224,10 +222,11 @@ static int pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu)
 
 out_mcesa:
 	nmi_free_per_cpu(lc);
+out_async:
+	stack_free(async_stack);
 out:
 	if (pcpu != &pcpu_devices[0]) {
-		free_page(panic_stack);
-		free_pages(async_stack, ASYNC_ORDER);
+		free_pages(nodat_stack, THREAD_SIZE_ORDER);
 		free_pages((unsigned long) pcpu->lowcore, LC_ORDER);
 	}
 	return -ENOMEM;
@@ -237,15 +236,21 @@ out:
 
 static void pcpu_free_lowcore(struct pcpu *pcpu)
 {
+	unsigned long async_stack, nodat_stack, lowcore;
+
+	nodat_stack = pcpu->lowcore->nodat_stack - STACK_INIT_OFFSET;
+	async_stack = pcpu->lowcore->async_stack - STACK_INIT_OFFSET;
+	lowcore = (unsigned long) pcpu->lowcore;
+
 	pcpu_sigp_retry(pcpu, SIGP_SET_PREFIX, 0);
 	lowcore_ptr[pcpu - pcpu_devices] = NULL;
 	vdso_free_per_cpu(pcpu->lowcore);
 	nmi_free_per_cpu(pcpu->lowcore);
+	stack_free(async_stack);
 	if (pcpu == &pcpu_devices[0])
 		return;
-	free_page(pcpu->lowcore->panic_stack-PANIC_FRAME_OFFSET);
-	free_pages(pcpu->lowcore->async_stack-ASYNC_FRAME_OFFSET, ASYNC_ORDER);
-	free_pages((unsigned long) pcpu->lowcore, LC_ORDER);
+	free_pages(nodat_stack, THREAD_SIZE_ORDER);
+	free_pages(lowcore, LC_ORDER);
 }
 
 #endif /* CONFIG_HOTPLUG_CPU */
@@ -293,7 +298,7 @@ static void pcpu_start_fn(struct pcpu *pcpu, void (*func)(void *), void *data)
 {
 	struct lowcore *lc = pcpu->lowcore;
 
-	lc->restart_stack = lc->kernel_stack;
+	lc->restart_stack = lc->nodat_stack;
 	lc->restart_fn = (unsigned long) func;
 	lc->restart_data = (unsigned long) data;
 	lc->restart_source = -1UL;
@@ -303,15 +308,21 @@ static void pcpu_start_fn(struct pcpu *pcpu, void (*func)(void *), void *data)
 /*
  * Call function via PSW restart on pcpu and stop the current cpu.
  */
-static void pcpu_delegate(struct pcpu *pcpu, void (*func)(void *),
-			  void *data, unsigned long stack)
+static void __pcpu_delegate(void (*func)(void*), void *data)
+{
+	func(data);	/* should not return */
+}
+
+static void __no_sanitize_address pcpu_delegate(struct pcpu *pcpu,
+						void (*func)(void *),
+						void *data, unsigned long stack)
 {
 	struct lowcore *lc = lowcore_ptr[pcpu - pcpu_devices];
 	unsigned long source_cpu = stap();
 
-	__load_psw_mask(PSW_KERNEL_BITS);
+	__load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT);
 	if (pcpu->address == source_cpu)
-		func(data);	/* should not return */
+		CALL_ON_STACK(__pcpu_delegate, stack, 2, func, data);
 	/* Stop target cpu (if func returns this stops the current cpu). */
 	pcpu_sigp_retry(pcpu, SIGP_STOP, 0);
 	/* Restart func on the target cpu and stop the current cpu. */
@@ -372,8 +383,7 @@ void smp_call_online_cpu(void (*func)(void *), void *data)
 void smp_call_ipl_cpu(void (*func)(void *), void *data)
 {
 	pcpu_delegate(&pcpu_devices[0], func, data,
-		      pcpu_devices->lowcore->panic_stack -
-		      PANIC_FRAME_OFFSET + PAGE_SIZE);
+		      pcpu_devices->lowcore->nodat_stack);
 }
 
 int smp_find_processor_id(u16 address)
@@ -791,37 +801,42 @@ void __init smp_detect_cpus(void)
 	memblock_free_early((unsigned long)info, sizeof(*info));
 }
 
-/*
- *	Activate a secondary processor.
- */
-static void smp_start_secondary(void *cpuvoid)
+static void smp_init_secondary(void)
 {
 	int cpu = smp_processor_id();
 
 	S390_lowcore.last_update_clock = get_tod_clock();
-	S390_lowcore.restart_stack = (unsigned long) restart_stack;
-	S390_lowcore.restart_fn = (unsigned long) do_restart;
-	S390_lowcore.restart_data = 0;
-	S390_lowcore.restart_source = -1UL;
 	restore_access_regs(S390_lowcore.access_regs_save_area);
-	__ctl_load(S390_lowcore.cregs_save_area, 0, 15);
-	__load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT);
 	cpu_init();
 	preempt_disable();
 	init_cpu_timer();
 	vtime_init();
 	pfault_init();
-	notify_cpu_starting(cpu);
+	notify_cpu_starting(smp_processor_id());
 	if (topology_cpu_dedicated(cpu))
 		set_cpu_flag(CIF_DEDICATED_CPU);
 	else
 		clear_cpu_flag(CIF_DEDICATED_CPU);
-	set_cpu_online(cpu, true);
+	set_cpu_online(smp_processor_id(), true);
 	inc_irq_stat(CPU_RST);
 	local_irq_enable();
 	cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
 }
 
+/*
+ *	Activate a secondary processor.
+ */
+static void __no_sanitize_address smp_start_secondary(void *cpuvoid)
+{
+	S390_lowcore.restart_stack = (unsigned long) restart_stack;
+	S390_lowcore.restart_fn = (unsigned long) do_restart;
+	S390_lowcore.restart_data = 0;
+	S390_lowcore.restart_source = -1UL;
+	__ctl_load(S390_lowcore.cregs_save_area, 0, 15);
+	__load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT);
+	CALL_ON_STACK(smp_init_secondary, S390_lowcore.kernel_stack, 0);
+}
+
 /* Upping and downing of CPUs */
 int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 {
diff --git a/arch/s390/kernel/sthyi.c b/arch/s390/kernel/sthyi.c
index 0859cde36f75..888cc2f166db 100644
--- a/arch/s390/kernel/sthyi.c
+++ b/arch/s390/kernel/sthyi.c
@@ -183,17 +183,19 @@ static void fill_hdr(struct sthyi_sctns *sctns)
 static void fill_stsi_mac(struct sthyi_sctns *sctns,
 			  struct sysinfo_1_1_1 *sysinfo)
 {
+	sclp_ocf_cpc_name_copy(sctns->mac.infmname);
+	if (*(u64 *)sctns->mac.infmname != 0)
+		sctns->mac.infmval1 |= MAC_NAME_VLD;
+
 	if (stsi(sysinfo, 1, 1, 1))
 		return;
 
-	sclp_ocf_cpc_name_copy(sctns->mac.infmname);
-
 	memcpy(sctns->mac.infmtype, sysinfo->type, sizeof(sctns->mac.infmtype));
 	memcpy(sctns->mac.infmmanu, sysinfo->manufacturer, sizeof(sctns->mac.infmmanu));
 	memcpy(sctns->mac.infmpman, sysinfo->plant, sizeof(sctns->mac.infmpman));
 	memcpy(sctns->mac.infmseq, sysinfo->sequence, sizeof(sctns->mac.infmseq));
 
-	sctns->mac.infmval1 |= MAC_ID_VLD | MAC_NAME_VLD;
+	sctns->mac.infmval1 |= MAC_ID_VLD;
 }
 
 static void fill_stsi_par(struct sthyi_sctns *sctns,
diff --git a/arch/s390/kernel/swsusp.S b/arch/s390/kernel/swsusp.S
index c1a080b11ae9..537f97fde37f 100644
--- a/arch/s390/kernel/swsusp.S
+++ b/arch/s390/kernel/swsusp.S
@@ -29,10 +29,11 @@
 
 	.section .text
 ENTRY(swsusp_arch_suspend)
-	stmg	%r6,%r15,__SF_GPRS(%r15)
+	lg	%r1,__LC_NODAT_STACK
+	aghi	%r1,-STACK_FRAME_OVERHEAD
+	stmg	%r6,%r15,__SF_GPRS(%r1)
+	stg	%r15,__SF_BACKCHAIN(%r1)
 	lgr	%r1,%r15
-	aghi	%r15,-STACK_FRAME_OVERHEAD
-	stg	%r1,__SF_BACKCHAIN(%r15)
 
 	/* Store FPU registers */
 	brasl	%r14,save_fpu_regs
@@ -197,9 +198,7 @@ pgm_check_entry:
 	brc	2,3b				/* busy, try again */
 
 	/* Suspend CPU not available -> panic */
-	larl	%r15,init_thread_union
-	aghi	%r15,1<<(PAGE_SHIFT+THREAD_SIZE_ORDER)
-	aghi	%r15,-STACK_FRAME_OVERHEAD
+	larl	%r15,init_thread_union+THREAD_SIZE-STACK_FRAME_OVERHEAD
 	larl	%r2,.Lpanic_string
 	brasl	%r14,sclp_early_printk_force
 	larl	%r3,.Ldisabled_wait_31
diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
index 3031cc6dd0ab..ec31b48a42a5 100644
--- a/arch/s390/kernel/vdso.c
+++ b/arch/s390/kernel/vdso.c
@@ -56,7 +56,7 @@ static vm_fault_t vdso_fault(const struct vm_special_mapping *sm,
 	vdso_pagelist = vdso64_pagelist;
 	vdso_pages = vdso64_pages;
 #ifdef CONFIG_COMPAT
-	if (is_compat_task()) {
+	if (vma->vm_mm->context.compat_mm) {
 		vdso_pagelist = vdso32_pagelist;
 		vdso_pages = vdso32_pages;
 	}
@@ -77,7 +77,7 @@ static int vdso_mremap(const struct vm_special_mapping *sm,
 
 	vdso_pages = vdso64_pages;
 #ifdef CONFIG_COMPAT
-	if (is_compat_task())
+	if (vma->vm_mm->context.compat_mm)
 		vdso_pages = vdso32_pages;
 #endif
 
@@ -224,8 +224,10 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 
 	vdso_pages = vdso64_pages;
 #ifdef CONFIG_COMPAT
-	if (is_compat_task())
+	if (is_compat_task()) {
 		vdso_pages = vdso32_pages;
+		mm->context.compat_mm = 1;
+	}
 #endif
 	/*
 	 * vDSO has a problem and was disabled, just don't "enable" it for
diff --git a/arch/s390/kernel/vdso32/Makefile b/arch/s390/kernel/vdso32/Makefile
index c5c856f320bc..eb8aebea3ea7 100644
--- a/arch/s390/kernel/vdso32/Makefile
+++ b/arch/s390/kernel/vdso32/Makefile
@@ -28,9 +28,10 @@ obj-y += vdso32_wrapper.o
 extra-y += vdso32.lds
 CPPFLAGS_vdso32.lds += -P -C -U$(ARCH)
 
-# Disable gcov profiling and ubsan for VDSO code
+# Disable gcov profiling, ubsan and kasan for VDSO code
 GCOV_PROFILE := n
 UBSAN_SANITIZE := n
+KASAN_SANITIZE := n
 
 # Force dependency (incbin is bad)
 $(obj)/vdso32_wrapper.o : $(obj)/vdso32.so
diff --git a/arch/s390/kernel/vdso32/clock_gettime.S b/arch/s390/kernel/vdso32/clock_gettime.S
index a9418bf975db..ada5c11a16e5 100644
--- a/arch/s390/kernel/vdso32/clock_gettime.S
+++ b/arch/s390/kernel/vdso32/clock_gettime.S
@@ -10,6 +10,7 @@
 #include <asm/asm-offsets.h>
 #include <asm/unistd.h>
 #include <asm/dwarf.h>
+#include <asm/ptrace.h>
 
 	.text
 	.align 4
@@ -18,8 +19,8 @@
 __kernel_clock_gettime:
 	CFI_STARTPROC
 	ahi	%r15,-16
-	CFI_DEF_CFA_OFFSET 176
-	CFI_VAL_OFFSET 15, -160
+	CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
+	CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
 	basr	%r5,0
 0:	al	%r5,21f-0b(%r5)			/* get &_vdso_data */
 	chi	%r2,__CLOCK_REALTIME_COARSE
@@ -72,13 +73,13 @@ __kernel_clock_gettime:
 	st	%r1,4(%r3)			/* store tp->tv_nsec */
 	lhi	%r2,0
 	ahi	%r15,16
-	CFI_DEF_CFA_OFFSET 160
+	CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
 	CFI_RESTORE 15
 	br	%r14
 
 	/* CLOCK_MONOTONIC_COARSE */
-	CFI_DEF_CFA_OFFSET 176
-	CFI_VAL_OFFSET 15, -160
+	CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
+	CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
 9:	l	%r4,__VDSO_UPD_COUNT+4(%r5)	/* load update counter */
 	tml	%r4,0x0001			/* pending update ? loop */
 	jnz	9b
@@ -158,17 +159,17 @@ __kernel_clock_gettime:
 	st	%r1,4(%r3)			/* store tp->tv_nsec */
 	lhi	%r2,0
 	ahi	%r15,16
-	CFI_DEF_CFA_OFFSET 160
+	CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
 	CFI_RESTORE 15
 	br	%r14
 
 	/* Fallback to system call */
-	CFI_DEF_CFA_OFFSET 176
-	CFI_VAL_OFFSET 15, -160
+	CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
+	CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
 19:	lhi	%r1,__NR_clock_gettime
 	svc	0
 	ahi	%r15,16
-	CFI_DEF_CFA_OFFSET 160
+	CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
 	CFI_RESTORE 15
 	br	%r14
 	CFI_ENDPROC
diff --git a/arch/s390/kernel/vdso32/gettimeofday.S b/arch/s390/kernel/vdso32/gettimeofday.S
index 3c0db0fa6ad9..b23063fbc892 100644
--- a/arch/s390/kernel/vdso32/gettimeofday.S
+++ b/arch/s390/kernel/vdso32/gettimeofday.S
@@ -10,6 +10,7 @@
 #include <asm/asm-offsets.h>
 #include <asm/unistd.h>
 #include <asm/dwarf.h>
+#include <asm/ptrace.h>
 
 	.text
 	.align 4
@@ -19,7 +20,7 @@ __kernel_gettimeofday:
 	CFI_STARTPROC
 	ahi	%r15,-16
 	CFI_ADJUST_CFA_OFFSET 16
-	CFI_VAL_OFFSET 15, -160
+	CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
 	basr	%r5,0
 0:	al	%r5,13f-0b(%r5)			/* get &_vdso_data */
 1:	ltr	%r3,%r3				/* check if tz is NULL */
diff --git a/arch/s390/kernel/vdso64/Makefile b/arch/s390/kernel/vdso64/Makefile
index 15b1ceafc4c1..a22b2cf86eec 100644
--- a/arch/s390/kernel/vdso64/Makefile
+++ b/arch/s390/kernel/vdso64/Makefile
@@ -28,9 +28,10 @@ obj-y += vdso64_wrapper.o
 extra-y += vdso64.lds
 CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)
 
-# Disable gcov profiling and ubsan for VDSO code
+# Disable gcov profiling, ubsan and kasan for VDSO code
 GCOV_PROFILE := n
 UBSAN_SANITIZE := n
+KASAN_SANITIZE := n
 
 # Force dependency (incbin is bad)
 $(obj)/vdso64_wrapper.o : $(obj)/vdso64.so
diff --git a/arch/s390/kernel/vdso64/clock_gettime.S b/arch/s390/kernel/vdso64/clock_gettime.S
index fac3ab5ec83a..9d2ee79b90f2 100644
--- a/arch/s390/kernel/vdso64/clock_gettime.S
+++ b/arch/s390/kernel/vdso64/clock_gettime.S
@@ -10,6 +10,7 @@
 #include <asm/asm-offsets.h>
 #include <asm/unistd.h>
 #include <asm/dwarf.h>
+#include <asm/ptrace.h>
 
 	.text
 	.align 4
@@ -18,8 +19,8 @@
 __kernel_clock_gettime:
 	CFI_STARTPROC
 	aghi	%r15,-16
-	CFI_DEF_CFA_OFFSET 176
-	CFI_VAL_OFFSET 15, -160
+	CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
+	CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
 	larl	%r5,_vdso_data
 	cghi	%r2,__CLOCK_REALTIME_COARSE
 	je	4f
@@ -56,13 +57,13 @@ __kernel_clock_gettime:
 	stg	%r1,8(%r3)			/* store tp->tv_nsec */
 	lghi	%r2,0
 	aghi	%r15,16
-	CFI_DEF_CFA_OFFSET 160
+	CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
 	CFI_RESTORE 15
 	br	%r14
 
 	/* CLOCK_MONOTONIC_COARSE */
-	CFI_DEF_CFA_OFFSET 176
-	CFI_VAL_OFFSET 15, -160
+	CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
+	CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
 3:	lg	%r4,__VDSO_UPD_COUNT(%r5)	/* load update counter */
 	tmll	%r4,0x0001			/* pending update ? loop */
 	jnz	3b
@@ -115,13 +116,13 @@ __kernel_clock_gettime:
 	stg	%r1,8(%r3)			/* store tp->tv_nsec */
 	lghi	%r2,0
 	aghi	%r15,16
-	CFI_DEF_CFA_OFFSET 160
+	CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
 	CFI_RESTORE 15
 	br	%r14
 
 	/* CPUCLOCK_VIRT for this thread */
-	CFI_DEF_CFA_OFFSET 176
-	CFI_VAL_OFFSET 15, -160
+	CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
+	CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
 9:	lghi	%r4,0
 	icm	%r0,15,__VDSO_ECTG_OK(%r5)
 	jz	12f
@@ -142,17 +143,17 @@ __kernel_clock_gettime:
 	stg	%r4,8(%r3)
 	lghi	%r2,0
 	aghi	%r15,16
-	CFI_DEF_CFA_OFFSET 160
+	CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
 	CFI_RESTORE 15
 	br	%r14
 
 	/* Fallback to system call */
-	CFI_DEF_CFA_OFFSET 176
-	CFI_VAL_OFFSET 15, -160
+	CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD+16
+	CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
 12:	lghi	%r1,__NR_clock_gettime
 	svc	0
 	aghi	%r15,16
-	CFI_DEF_CFA_OFFSET 160
+	CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
 	CFI_RESTORE 15
 	br	%r14
 	CFI_ENDPROC
diff --git a/arch/s390/kernel/vdso64/gettimeofday.S b/arch/s390/kernel/vdso64/gettimeofday.S
index 6e1f0b421695..aebe10dc7c99 100644
--- a/arch/s390/kernel/vdso64/gettimeofday.S
+++ b/arch/s390/kernel/vdso64/gettimeofday.S
@@ -10,6 +10,7 @@
 #include <asm/asm-offsets.h>
 #include <asm/unistd.h>
 #include <asm/dwarf.h>
+#include <asm/ptrace.h>
 
 	.text
 	.align 4
@@ -19,7 +20,7 @@ __kernel_gettimeofday:
 	CFI_STARTPROC
 	aghi	%r15,-16
 	CFI_ADJUST_CFA_OFFSET 16
-	CFI_VAL_OFFSET 15, -160
+	CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
 	larl	%r5,_vdso_data
 0:	ltgr	%r3,%r3				/* check if tz is NULL */
 	je	1f
diff --git a/arch/s390/kernel/vmlinux.lds.S b/arch/s390/kernel/vmlinux.lds.S
index b43f8d33a369..cc3cbdc93d35 100644
--- a/arch/s390/kernel/vmlinux.lds.S
+++ b/arch/s390/kernel/vmlinux.lds.S
@@ -16,6 +16,7 @@
 #define RO_AFTER_INIT_DATA
 
 #include <asm-generic/vmlinux.lds.h>
+#include <asm/vmlinux.lds.h>
 
 OUTPUT_FORMAT("elf64-s390", "elf64-s390", "elf64-s390")
 OUTPUT_ARCH(s390:64-bit)
@@ -134,6 +135,8 @@ SECTIONS
 		__nospec_return_end = . ;
 	}
 
+	BOOT_DATA
+
 	/* early.c uses stsi, which requires page aligned data. */
 	. = ALIGN(PAGE_SIZE);
 	INIT_DATA_SECTION(0x100)
@@ -146,6 +149,19 @@ SECTIONS
 
 	_end = . ;
 
+	/*
+	 * uncompressed image info used by the decompressor
+	 * it should match struct vmlinux_info
+	 */
+	.vmlinux.info 0 : {
+		QUAD(_stext)					/* default_lma */
+		QUAD(startup_continue)				/* entry */
+		QUAD(__bss_start - _stext)			/* image_size */
+		QUAD(__bss_stop - __bss_start)			/* bss_size */
+		QUAD(__boot_data_start)				/* bootdata_off */
+		QUAD(__boot_data_end - __boot_data_start)	/* bootdata_size */
+	}
+
 	/* Debugging sections.	*/
 	STABS_DEBUG
 	DWARF_DEBUG
diff --git a/arch/s390/lib/Makefile b/arch/s390/lib/Makefile
index 57ab40188d4b..5418d10dc2a8 100644
--- a/arch/s390/lib/Makefile
+++ b/arch/s390/lib/Makefile
@@ -9,5 +9,9 @@ lib-$(CONFIG_SMP) += spinlock.o
 lib-$(CONFIG_KPROBES) += probes.o
 lib-$(CONFIG_UPROBES) += probes.o
 
+# Instrumenting memory accesses to __user data (in different address space)
+# produce false positives
+KASAN_SANITIZE_uaccess.o := n
+
 chkbss := mem.o
 include $(srctree)/arch/s390/scripts/Makefile.chkbss
diff --git a/arch/s390/lib/mem.S b/arch/s390/lib/mem.S
index 40c4d59c926e..53008da05190 100644
--- a/arch/s390/lib/mem.S
+++ b/arch/s390/lib/mem.S
@@ -14,7 +14,8 @@
 /*
  * void *memmove(void *dest, const void *src, size_t n)
  */
-ENTRY(memmove)
+WEAK(memmove)
+ENTRY(__memmove)
 	ltgr	%r4,%r4
 	lgr	%r1,%r2
 	jz	.Lmemmove_exit
@@ -47,6 +48,7 @@ ENTRY(memmove)
 	BR_EX	%r14
 .Lmemmove_mvc:
 	mvc	0(1,%r1),0(%r3)
+ENDPROC(__memmove)
 EXPORT_SYMBOL(memmove)
 
 /*
@@ -64,7 +66,8 @@ EXPORT_SYMBOL(memmove)
  *	return __builtin_memset(s, c, n);
  * }
  */
-ENTRY(memset)
+WEAK(memset)
+ENTRY(__memset)
 	ltgr	%r4,%r4
 	jz	.Lmemset_exit
 	ltgr	%r3,%r3
@@ -108,6 +111,7 @@ ENTRY(memset)
 	xc	0(1,%r1),0(%r1)
 .Lmemset_mvc:
 	mvc	1(1,%r1),0(%r1)
+ENDPROC(__memset)
 EXPORT_SYMBOL(memset)
 
 /*
@@ -115,7 +119,8 @@ EXPORT_SYMBOL(memset)
  *
  * void *memcpy(void *dest, const void *src, size_t n)
  */
-ENTRY(memcpy)
+WEAK(memcpy)
+ENTRY(__memcpy)
 	ltgr	%r4,%r4
 	jz	.Lmemcpy_exit
 	aghi	%r4,-1
@@ -136,6 +141,7 @@ ENTRY(memcpy)
 	j	.Lmemcpy_remainder
 .Lmemcpy_mvc:
 	mvc	0(1,%r1),0(%r3)
+ENDPROC(__memcpy)
 EXPORT_SYMBOL(memcpy)
 
 /*
diff --git a/arch/s390/mm/Makefile b/arch/s390/mm/Makefile
index 33fe418506bc..f5880bfd1b0c 100644
--- a/arch/s390/mm/Makefile
+++ b/arch/s390/mm/Makefile
@@ -4,10 +4,12 @@
 #
 
 obj-y		:= init.o fault.o extmem.o mmap.o vmem.o maccess.o
-obj-y		+= page-states.o gup.o pageattr.o mem_detect.o
-obj-y		+= pgtable.o pgalloc.o
+obj-y		+= page-states.o gup.o pageattr.o pgtable.o pgalloc.o
 
 obj-$(CONFIG_CMM)		+= cmm.o
 obj-$(CONFIG_HUGETLB_PAGE)	+= hugetlbpage.o
 obj-$(CONFIG_S390_PTDUMP)	+= dump_pagetables.o
 obj-$(CONFIG_PGSTE)		+= gmap.o
+
+KASAN_SANITIZE_kasan_init.o	:= n
+obj-$(CONFIG_KASAN)		+= kasan_init.o
diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c
index 7cdea2ec51e9..363f6470d742 100644
--- a/arch/s390/mm/dump_pagetables.c
+++ b/arch/s390/mm/dump_pagetables.c
@@ -3,6 +3,8 @@
 #include <linux/debugfs.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
+#include <linux/kasan.h>
+#include <asm/kasan.h>
 #include <asm/sections.h>
 #include <asm/pgtable.h>
 
@@ -17,18 +19,26 @@ enum address_markers_idx {
 	IDENTITY_NR = 0,
 	KERNEL_START_NR,
 	KERNEL_END_NR,
+#ifdef CONFIG_KASAN
+	KASAN_SHADOW_START_NR,
+	KASAN_SHADOW_END_NR,
+#endif
 	VMEMMAP_NR,
 	VMALLOC_NR,
 	MODULES_NR,
 };
 
 static struct addr_marker address_markers[] = {
-	[IDENTITY_NR]	  = {0, "Identity Mapping"},
-	[KERNEL_START_NR] = {(unsigned long)_stext, "Kernel Image Start"},
-	[KERNEL_END_NR]	  = {(unsigned long)_end, "Kernel Image End"},
-	[VMEMMAP_NR]	  = {0, "vmemmap Area"},
-	[VMALLOC_NR]	  = {0, "vmalloc Area"},
-	[MODULES_NR]	  = {0, "Modules Area"},
+	[IDENTITY_NR]		= {0, "Identity Mapping"},
+	[KERNEL_START_NR]	= {(unsigned long)_stext, "Kernel Image Start"},
+	[KERNEL_END_NR]		= {(unsigned long)_end, "Kernel Image End"},
+#ifdef CONFIG_KASAN
+	[KASAN_SHADOW_START_NR]	= {KASAN_SHADOW_START, "Kasan Shadow Start"},
+	[KASAN_SHADOW_END_NR]	= {KASAN_SHADOW_END, "Kasan Shadow End"},
+#endif
+	[VMEMMAP_NR]		= {0, "vmemmap Area"},
+	[VMALLOC_NR]		= {0, "vmalloc Area"},
+	[MODULES_NR]		= {0, "Modules Area"},
 	{ -1, NULL }
 };
 
@@ -80,7 +90,7 @@ static void note_page(struct seq_file *m, struct pg_state *st,
 	} else if (prot != cur || level != st->level ||
 		   st->current_address >= st->marker[1].start_address) {
 		/* Print the actual finished series */
-		seq_printf(m, "0x%0*lx-0x%0*lx",
+		seq_printf(m, "0x%0*lx-0x%0*lx ",
 			   width, st->start_address,
 			   width, st->current_address);
 		delta = (st->current_address - st->start_address) >> 10;
@@ -90,7 +100,7 @@ static void note_page(struct seq_file *m, struct pg_state *st,
 		}
 		seq_printf(m, "%9lu%c ", delta, *unit);
 		print_prot(m, st->current_prot, st->level);
-		if (st->current_address >= st->marker[1].start_address) {
+		while (st->current_address >= st->marker[1].start_address) {
 			st->marker++;
 			seq_printf(m, "---[ %s ]---\n", st->marker->name);
 		}
@@ -100,6 +110,17 @@ static void note_page(struct seq_file *m, struct pg_state *st,
 	}
 }
 
+#ifdef CONFIG_KASAN
+static void note_kasan_zero_page(struct seq_file *m, struct pg_state *st)
+{
+	unsigned int prot;
+
+	prot = pte_val(*kasan_zero_pte) &
+		(_PAGE_PROTECT | _PAGE_INVALID | _PAGE_NOEXEC);
+	note_page(m, st, prot, 4);
+}
+#endif
+
 /*
  * The actual page table walker functions. In order to keep the
  * implementation of print_prot() short, we only check and pass
@@ -132,6 +153,13 @@ static void walk_pmd_level(struct seq_file *m, struct pg_state *st,
 	pmd_t *pmd;
 	int i;
 
+#ifdef CONFIG_KASAN
+	if ((pud_val(*pud) & PAGE_MASK) == __pa(kasan_zero_pmd)) {
+		note_kasan_zero_page(m, st);
+		return;
+	}
+#endif
+
 	for (i = 0; i < PTRS_PER_PMD && addr < max_addr; i++) {
 		st->current_address = addr;
 		pmd = pmd_offset(pud, addr);
@@ -156,6 +184,13 @@ static void walk_pud_level(struct seq_file *m, struct pg_state *st,
 	pud_t *pud;
 	int i;
 
+#ifdef CONFIG_KASAN
+	if ((p4d_val(*p4d) & PAGE_MASK) == __pa(kasan_zero_pud)) {
+		note_kasan_zero_page(m, st);
+		return;
+	}
+#endif
+
 	for (i = 0; i < PTRS_PER_PUD && addr < max_addr; i++) {
 		st->current_address = addr;
 		pud = pud_offset(p4d, addr);
@@ -179,6 +214,13 @@ static void walk_p4d_level(struct seq_file *m, struct pg_state *st,
 	p4d_t *p4d;
 	int i;
 
+#ifdef CONFIG_KASAN
+	if ((pgd_val(*pgd) & PAGE_MASK) == __pa(kasan_zero_p4d)) {
+		note_kasan_zero_page(m, st);
+		return;
+	}
+#endif
+
 	for (i = 0; i < PTRS_PER_P4D && addr < max_addr; i++) {
 		st->current_address = addr;
 		p4d = p4d_offset(pgd, addr);
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 72af23bacbb5..2b8f32f56e0c 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -636,17 +636,19 @@ struct pfault_refbk {
 	u64 reserved;
 } __attribute__ ((packed, aligned(8)));
 
+static struct pfault_refbk pfault_init_refbk = {
+	.refdiagc = 0x258,
+	.reffcode = 0,
+	.refdwlen = 5,
+	.refversn = 2,
+	.refgaddr = __LC_LPP,
+	.refselmk = 1ULL << 48,
+	.refcmpmk = 1ULL << 48,
+	.reserved = __PF_RES_FIELD
+};
+
 int pfault_init(void)
 {
-	struct pfault_refbk refbk = {
-		.refdiagc = 0x258,
-		.reffcode = 0,
-		.refdwlen = 5,
-		.refversn = 2,
-		.refgaddr = __LC_LPP,
-		.refselmk = 1ULL << 48,
-		.refcmpmk = 1ULL << 48,
-		.reserved = __PF_RES_FIELD };
         int rc;
 
 	if (pfault_disable)
@@ -658,18 +660,20 @@ int pfault_init(void)
 		"1:	la	%0,8\n"
 		"2:\n"
 		EX_TABLE(0b,1b)
-		: "=d" (rc) : "a" (&refbk), "m" (refbk) : "cc");
+		: "=d" (rc)
+		: "a" (&pfault_init_refbk), "m" (pfault_init_refbk) : "cc");
         return rc;
 }
 
+static struct pfault_refbk pfault_fini_refbk = {
+	.refdiagc = 0x258,
+	.reffcode = 1,
+	.refdwlen = 5,
+	.refversn = 2,
+};
+
 void pfault_fini(void)
 {
-	struct pfault_refbk refbk = {
-		.refdiagc = 0x258,
-		.reffcode = 1,
-		.refdwlen = 5,
-		.refversn = 2,
-	};
 
 	if (pfault_disable)
 		return;
@@ -678,7 +682,7 @@ void pfault_fini(void)
 		"	diag	%0,0,0x258\n"
 		"0:	nopr	%%r7\n"
 		EX_TABLE(0b,0b)
-		: : "a" (&refbk), "m" (refbk) : "cc");
+		: : "a" (&pfault_fini_refbk), "m" (pfault_fini_refbk) : "cc");
 }
 
 static DEFINE_SPINLOCK(pfault_lock);
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 3fa3e5323612..92d7a153e72a 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -42,6 +42,7 @@
 #include <asm/ctl_reg.h>
 #include <asm/sclp.h>
 #include <asm/set_memory.h>
+#include <asm/kasan.h>
 
 pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
 
@@ -98,8 +99,9 @@ void __init paging_init(void)
 	S390_lowcore.user_asce = S390_lowcore.kernel_asce;
 	crst_table_init((unsigned long *) init_mm.pgd, pgd_type);
 	vmem_map_init();
+	kasan_copy_shadow(init_mm.pgd);
 
-        /* enable virtual mapping in kernel mode */
+	/* enable virtual mapping in kernel mode */
 	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
 	__ctl_load(S390_lowcore.kernel_asce, 7, 7);
 	__ctl_load(S390_lowcore.kernel_asce, 13, 13);
@@ -107,6 +109,7 @@ void __init paging_init(void)
 	psw_bits(psw).dat = 1;
 	psw_bits(psw).as = PSW_BITS_AS_HOME;
 	__load_psw_mask(psw.mask);
+	kasan_free_early_identity();
 
 	sparse_memory_present_with_active_regions(MAX_NUMNODES);
 	sparse_init();
diff --git a/arch/s390/mm/kasan_init.c b/arch/s390/mm/kasan_init.c
new file mode 100644
index 000000000000..acb9645b762b
--- /dev/null
+++ b/arch/s390/mm/kasan_init.c
@@ -0,0 +1,387 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/kasan.h>
+#include <linux/sched/task.h>
+#include <linux/memblock.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/kasan.h>
+#include <asm/mem_detect.h>
+#include <asm/processor.h>
+#include <asm/sclp.h>
+#include <asm/facility.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+
+static unsigned long segment_pos __initdata;
+static unsigned long segment_low __initdata;
+static unsigned long pgalloc_pos __initdata;
+static unsigned long pgalloc_low __initdata;
+static unsigned long pgalloc_freeable __initdata;
+static bool has_edat __initdata;
+static bool has_nx __initdata;
+
+#define __sha(x) ((unsigned long)kasan_mem_to_shadow((void *)x))
+
+static pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
+
+static void __init kasan_early_panic(const char *reason)
+{
+	sclp_early_printk("The Linux kernel failed to boot with the KernelAddressSanitizer:\n");
+	sclp_early_printk(reason);
+	disabled_wait(0);
+}
+
+static void * __init kasan_early_alloc_segment(void)
+{
+	segment_pos -= _SEGMENT_SIZE;
+
+	if (segment_pos < segment_low)
+		kasan_early_panic("out of memory during initialisation\n");
+
+	return (void *)segment_pos;
+}
+
+static void * __init kasan_early_alloc_pages(unsigned int order)
+{
+	pgalloc_pos -= (PAGE_SIZE << order);
+
+	if (pgalloc_pos < pgalloc_low)
+		kasan_early_panic("out of memory during initialisation\n");
+
+	return (void *)pgalloc_pos;
+}
+
+static void * __init kasan_early_crst_alloc(unsigned long val)
+{
+	unsigned long *table;
+
+	table = kasan_early_alloc_pages(CRST_ALLOC_ORDER);
+	if (table)
+		crst_table_init(table, val);
+	return table;
+}
+
+static pte_t * __init kasan_early_pte_alloc(void)
+{
+	static void *pte_leftover;
+	pte_t *pte;
+
+	BUILD_BUG_ON(_PAGE_TABLE_SIZE * 2 != PAGE_SIZE);
+
+	if (!pte_leftover) {
+		pte_leftover = kasan_early_alloc_pages(0);
+		pte = pte_leftover + _PAGE_TABLE_SIZE;
+	} else {
+		pte = pte_leftover;
+		pte_leftover = NULL;
+	}
+	memset64((u64 *)pte, _PAGE_INVALID, PTRS_PER_PTE);
+	return pte;
+}
+
+enum populate_mode {
+	POPULATE_ONE2ONE,
+	POPULATE_MAP,
+	POPULATE_ZERO_SHADOW
+};
+static void __init kasan_early_vmemmap_populate(unsigned long address,
+						unsigned long end,
+						enum populate_mode mode)
+{
+	unsigned long pgt_prot_zero, pgt_prot, sgt_prot;
+	pgd_t *pg_dir;
+	p4d_t *p4_dir;
+	pud_t *pu_dir;
+	pmd_t *pm_dir;
+	pte_t *pt_dir;
+
+	pgt_prot_zero = pgprot_val(PAGE_KERNEL_RO);
+	if (!has_nx)
+		pgt_prot_zero &= ~_PAGE_NOEXEC;
+	pgt_prot = pgprot_val(PAGE_KERNEL_EXEC);
+	sgt_prot = pgprot_val(SEGMENT_KERNEL_EXEC);
+
+	while (address < end) {
+		pg_dir = pgd_offset_k(address);
+		if (pgd_none(*pg_dir)) {
+			if (mode == POPULATE_ZERO_SHADOW &&
+			    IS_ALIGNED(address, PGDIR_SIZE) &&
+			    end - address >= PGDIR_SIZE) {
+				pgd_populate(&init_mm, pg_dir, kasan_zero_p4d);
+				address = (address + PGDIR_SIZE) & PGDIR_MASK;
+				continue;
+			}
+			p4_dir = kasan_early_crst_alloc(_REGION2_ENTRY_EMPTY);
+			pgd_populate(&init_mm, pg_dir, p4_dir);
+		}
+
+		p4_dir = p4d_offset(pg_dir, address);
+		if (p4d_none(*p4_dir)) {
+			if (mode == POPULATE_ZERO_SHADOW &&
+			    IS_ALIGNED(address, P4D_SIZE) &&
+			    end - address >= P4D_SIZE) {
+				p4d_populate(&init_mm, p4_dir, kasan_zero_pud);
+				address = (address + P4D_SIZE) & P4D_MASK;
+				continue;
+			}
+			pu_dir = kasan_early_crst_alloc(_REGION3_ENTRY_EMPTY);
+			p4d_populate(&init_mm, p4_dir, pu_dir);
+		}
+
+		pu_dir = pud_offset(p4_dir, address);
+		if (pud_none(*pu_dir)) {
+			if (mode == POPULATE_ZERO_SHADOW &&
+			    IS_ALIGNED(address, PUD_SIZE) &&
+			    end - address >= PUD_SIZE) {
+				pud_populate(&init_mm, pu_dir, kasan_zero_pmd);
+				address = (address + PUD_SIZE) & PUD_MASK;
+				continue;
+			}
+			pm_dir = kasan_early_crst_alloc(_SEGMENT_ENTRY_EMPTY);
+			pud_populate(&init_mm, pu_dir, pm_dir);
+		}
+
+		pm_dir = pmd_offset(pu_dir, address);
+		if (pmd_none(*pm_dir)) {
+			if (mode == POPULATE_ZERO_SHADOW &&
+			    IS_ALIGNED(address, PMD_SIZE) &&
+			    end - address >= PMD_SIZE) {
+				pmd_populate(&init_mm, pm_dir, kasan_zero_pte);
+				address = (address + PMD_SIZE) & PMD_MASK;
+				continue;
+			}
+			/* the first megabyte of 1:1 is mapped with 4k pages */
+			if (has_edat && address && end - address >= PMD_SIZE &&
+			    mode != POPULATE_ZERO_SHADOW) {
+				void *page;
+
+				if (mode == POPULATE_ONE2ONE) {
+					page = (void *)address;
+				} else {
+					page = kasan_early_alloc_segment();
+					memset(page, 0, _SEGMENT_SIZE);
+				}
+				pmd_val(*pm_dir) = __pa(page) | sgt_prot;
+				address = (address + PMD_SIZE) & PMD_MASK;
+				continue;
+			}
+
+			pt_dir = kasan_early_pte_alloc();
+			pmd_populate(&init_mm, pm_dir, pt_dir);
+		} else if (pmd_large(*pm_dir)) {
+			address = (address + PMD_SIZE) & PMD_MASK;
+			continue;
+		}
+
+		pt_dir = pte_offset_kernel(pm_dir, address);
+		if (pte_none(*pt_dir)) {
+			void *page;
+
+			switch (mode) {
+			case POPULATE_ONE2ONE:
+				page = (void *)address;
+				pte_val(*pt_dir) = __pa(page) | pgt_prot;
+				break;
+			case POPULATE_MAP:
+				page = kasan_early_alloc_pages(0);
+				memset(page, 0, PAGE_SIZE);
+				pte_val(*pt_dir) = __pa(page) | pgt_prot;
+				break;
+			case POPULATE_ZERO_SHADOW:
+				page = kasan_zero_page;
+				pte_val(*pt_dir) = __pa(page) | pgt_prot_zero;
+				break;
+			}
+		}
+		address += PAGE_SIZE;
+	}
+}
+
+static void __init kasan_set_pgd(pgd_t *pgd, unsigned long asce_type)
+{
+	unsigned long asce_bits;
+
+	asce_bits = asce_type | _ASCE_TABLE_LENGTH;
+	S390_lowcore.kernel_asce = (__pa(pgd) & PAGE_MASK) | asce_bits;
+	S390_lowcore.user_asce = S390_lowcore.kernel_asce;
+
+	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
+	__ctl_load(S390_lowcore.kernel_asce, 7, 7);
+	__ctl_load(S390_lowcore.kernel_asce, 13, 13);
+}
+
+static void __init kasan_enable_dat(void)
+{
+	psw_t psw;
+
+	psw.mask = __extract_psw();
+	psw_bits(psw).dat = 1;
+	psw_bits(psw).as = PSW_BITS_AS_HOME;
+	__load_psw_mask(psw.mask);
+}
+
+static void __init kasan_early_detect_facilities(void)
+{
+	__stfle(S390_lowcore.stfle_fac_list,
+		ARRAY_SIZE(S390_lowcore.stfle_fac_list));
+	if (test_facility(8)) {
+		has_edat = true;
+		__ctl_set_bit(0, 23);
+	}
+	if (!noexec_disabled && test_facility(130)) {
+		has_nx = true;
+		__ctl_set_bit(0, 20);
+	}
+}
+
+static unsigned long __init get_mem_detect_end(void)
+{
+	unsigned long start;
+	unsigned long end;
+
+	if (mem_detect.count) {
+		__get_mem_detect_block(mem_detect.count - 1, &start, &end);
+		return end;
+	}
+	return 0;
+}
+
+void __init kasan_early_init(void)
+{
+	unsigned long untracked_mem_end;
+	unsigned long shadow_alloc_size;
+	unsigned long initrd_end;
+	unsigned long asce_type;
+	unsigned long memsize;
+	unsigned long vmax;
+	unsigned long pgt_prot = pgprot_val(PAGE_KERNEL_RO);
+	pte_t pte_z;
+	pmd_t pmd_z = __pmd(__pa(kasan_zero_pte) | _SEGMENT_ENTRY);
+	pud_t pud_z = __pud(__pa(kasan_zero_pmd) | _REGION3_ENTRY);
+	p4d_t p4d_z = __p4d(__pa(kasan_zero_pud) | _REGION2_ENTRY);
+
+	kasan_early_detect_facilities();
+	if (!has_nx)
+		pgt_prot &= ~_PAGE_NOEXEC;
+	pte_z = __pte(__pa(kasan_zero_page) | pgt_prot);
+
+	memsize = get_mem_detect_end();
+	if (!memsize)
+		kasan_early_panic("cannot detect physical memory size\n");
+	/* respect mem= cmdline parameter */
+	if (memory_end_set && memsize > memory_end)
+		memsize = memory_end;
+	memsize = min(memsize, KASAN_SHADOW_START);
+
+	if (IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)) {
+		/* 4 level paging */
+		BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_START, P4D_SIZE));
+		BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_END, P4D_SIZE));
+		crst_table_init((unsigned long *)early_pg_dir,
+				_REGION2_ENTRY_EMPTY);
+		untracked_mem_end = vmax = _REGION1_SIZE;
+		asce_type = _ASCE_TYPE_REGION2;
+	} else {
+		/* 3 level paging */
+		BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_START, PUD_SIZE));
+		BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_END, PUD_SIZE));
+		crst_table_init((unsigned long *)early_pg_dir,
+				_REGION3_ENTRY_EMPTY);
+		untracked_mem_end = vmax = _REGION2_SIZE;
+		asce_type = _ASCE_TYPE_REGION3;
+	}
+
+	/* init kasan zero shadow */
+	crst_table_init((unsigned long *)kasan_zero_p4d, p4d_val(p4d_z));
+	crst_table_init((unsigned long *)kasan_zero_pud, pud_val(pud_z));
+	crst_table_init((unsigned long *)kasan_zero_pmd, pmd_val(pmd_z));
+	memset64((u64 *)kasan_zero_pte, pte_val(pte_z), PTRS_PER_PTE);
+
+	shadow_alloc_size = memsize >> KASAN_SHADOW_SCALE_SHIFT;
+	pgalloc_low = round_up((unsigned long)_end, _SEGMENT_SIZE);
+	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD)) {
+		initrd_end =
+		    round_up(INITRD_START + INITRD_SIZE, _SEGMENT_SIZE);
+		pgalloc_low = max(pgalloc_low, initrd_end);
+	}
+
+	if (pgalloc_low + shadow_alloc_size > memsize)
+		kasan_early_panic("out of memory during initialisation\n");
+
+	if (has_edat) {
+		segment_pos = round_down(memsize, _SEGMENT_SIZE);
+		segment_low = segment_pos - shadow_alloc_size;
+		pgalloc_pos = segment_low;
+	} else {
+		pgalloc_pos = memsize;
+	}
+	init_mm.pgd = early_pg_dir;
+	/*
+	 * Current memory layout:
+	 * +- 0 -------------+	 +- shadow start -+
+	 * | 1:1 ram mapping |	/| 1/8 ram	  |
+	 * +- end of ram ----+ / +----------------+
+	 * | ... gap ...     |/  |	kasan	  |
+	 * +- shadow start --+	 |	zero	  |
+	 * | 1/8 addr space  |	 |	page	  |
+	 * +- shadow end    -+	 |	mapping	  |
+	 * | ... gap ...     |\  |    (untracked) |
+	 * +- modules vaddr -+ \ +----------------+
+	 * | 2Gb	     |	\|	unmapped  | allocated per module
+	 * +-----------------+	 +- shadow end ---+
+	 */
+	/* populate kasan shadow (for identity mapping and zero page mapping) */
+	kasan_early_vmemmap_populate(__sha(0), __sha(memsize), POPULATE_MAP);
+	if (IS_ENABLED(CONFIG_MODULES))
+		untracked_mem_end = vmax - MODULES_LEN;
+	kasan_early_vmemmap_populate(__sha(max_physmem_end),
+				     __sha(untracked_mem_end),
+				     POPULATE_ZERO_SHADOW);
+	/* memory allocated for identity mapping structs will be freed later */
+	pgalloc_freeable = pgalloc_pos;
+	/* populate identity mapping */
+	kasan_early_vmemmap_populate(0, memsize, POPULATE_ONE2ONE);
+	kasan_set_pgd(early_pg_dir, asce_type);
+	kasan_enable_dat();
+	/* enable kasan */
+	init_task.kasan_depth = 0;
+	memblock_reserve(pgalloc_pos, memsize - pgalloc_pos);
+	sclp_early_printk("KernelAddressSanitizer initialized\n");
+}
+
+void __init kasan_copy_shadow(pgd_t *pg_dir)
+{
+	/*
+	 * At this point we are still running on early pages setup early_pg_dir,
+	 * while swapper_pg_dir has just been initialized with identity mapping.
+	 * Carry over shadow memory region from early_pg_dir to swapper_pg_dir.
+	 */
+
+	pgd_t *pg_dir_src;
+	pgd_t *pg_dir_dst;
+	p4d_t *p4_dir_src;
+	p4d_t *p4_dir_dst;
+	pud_t *pu_dir_src;
+	pud_t *pu_dir_dst;
+
+	pg_dir_src = pgd_offset_raw(early_pg_dir, KASAN_SHADOW_START);
+	pg_dir_dst = pgd_offset_raw(pg_dir, KASAN_SHADOW_START);
+	p4_dir_src = p4d_offset(pg_dir_src, KASAN_SHADOW_START);
+	p4_dir_dst = p4d_offset(pg_dir_dst, KASAN_SHADOW_START);
+	if (!p4d_folded(*p4_dir_src)) {
+		/* 4 level paging */
+		memcpy(p4_dir_dst, p4_dir_src,
+		       (KASAN_SHADOW_SIZE >> P4D_SHIFT) * sizeof(p4d_t));
+		return;
+	}
+	/* 3 level paging */
+	pu_dir_src = pud_offset(p4_dir_src, KASAN_SHADOW_START);
+	pu_dir_dst = pud_offset(p4_dir_dst, KASAN_SHADOW_START);
+	memcpy(pu_dir_dst, pu_dir_src,
+	       (KASAN_SHADOW_SIZE >> PUD_SHIFT) * sizeof(pud_t));
+}
+
+void __init kasan_free_early_identity(void)
+{
+	memblock_free(pgalloc_pos, pgalloc_freeable - pgalloc_pos);
+}
diff --git a/arch/s390/mm/maccess.c b/arch/s390/mm/maccess.c
index 7be06475809b..97b3ee53852b 100644
--- a/arch/s390/mm/maccess.c
+++ b/arch/s390/mm/maccess.c
@@ -89,10 +89,8 @@ static int __memcpy_real(void *dest, void *src, size_t count)
 	return rc;
 }
 
-/*
- * Copy memory in real mode (kernel to kernel)
- */
-int memcpy_real(void *dest, void *src, size_t count)
+static unsigned long _memcpy_real(unsigned long dest, unsigned long src,
+				  unsigned long count)
 {
 	int irqs_disabled, rc;
 	unsigned long flags;
@@ -103,7 +101,7 @@ int memcpy_real(void *dest, void *src, size_t count)
 	irqs_disabled = arch_irqs_disabled_flags(flags);
 	if (!irqs_disabled)
 		trace_hardirqs_off();
-	rc = __memcpy_real(dest, src, count);
+	rc = __memcpy_real((void *) dest, (void *) src, (size_t) count);
 	if (!irqs_disabled)
 		trace_hardirqs_on();
 	__arch_local_irq_ssm(flags);
@@ -111,6 +109,23 @@ int memcpy_real(void *dest, void *src, size_t count)
 }
 
 /*
+ * Copy memory in real mode (kernel to kernel)
+ */
+int memcpy_real(void *dest, void *src, size_t count)
+{
+	if (S390_lowcore.nodat_stack != 0)
+		return CALL_ON_STACK(_memcpy_real, S390_lowcore.nodat_stack,
+				     3, dest, src, count);
+	/*
+	 * This is a really early memcpy_real call, the stacks are
+	 * not set up yet. Just call _memcpy_real on the early boot
+	 * stack
+	 */
+	return _memcpy_real((unsigned long) dest,(unsigned long) src,
+			    (unsigned long) count);
+}
+
+/*
  * Copy memory in absolute mode (kernel to kernel)
  */
 void memcpy_absolute(void *dest, void *src, size_t count)
diff --git a/arch/s390/mm/mem_detect.c b/arch/s390/mm/mem_detect.c
deleted file mode 100644
index 21f6c82c8296..000000000000
--- a/arch/s390/mm/mem_detect.c
+++ /dev/null
@@ -1,62 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright IBM Corp. 2008, 2009
- *
- * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
- */
-
-#include <linux/kernel.h>
-#include <linux/memblock.h>
-#include <linux/init.h>
-#include <linux/debugfs.h>
-#include <linux/seq_file.h>
-#include <asm/ipl.h>
-#include <asm/sclp.h>
-#include <asm/setup.h>
-
-#define CHUNK_READ_WRITE 0
-#define CHUNK_READ_ONLY  1
-
-static inline void memblock_physmem_add(phys_addr_t start, phys_addr_t size)
-{
-	memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n",
-		     start, start + size - 1);
-	memblock_add_range(&memblock.memory, start, size, 0, 0);
-	memblock_add_range(&memblock.physmem, start, size, 0, 0);
-}
-
-void __init detect_memory_memblock(void)
-{
-	unsigned long memsize, rnmax, rzm, addr, size;
-	int type;
-
-	rzm = sclp.rzm;
-	rnmax = sclp.rnmax;
-	memsize = rzm * rnmax;
-	if (!rzm)
-		rzm = 1UL << 17;
-	max_physmem_end = memsize;
-	addr = 0;
-	/* keep memblock lists close to the kernel */
-	memblock_set_bottom_up(true);
-	do {
-		size = 0;
-		/* assume lowcore is writable */
-		type = addr ? tprot(addr) : CHUNK_READ_WRITE;
-		do {
-			size += rzm;
-			if (max_physmem_end && addr + size >= max_physmem_end)
-				break;
-		} while (type == tprot(addr + size));
-		if (type == CHUNK_READ_WRITE || type == CHUNK_READ_ONLY) {
-			if (max_physmem_end && (addr + size > max_physmem_end))
-				size = max_physmem_end - addr;
-			memblock_physmem_add(addr, size);
-		}
-		addr += size;
-	} while (addr < max_physmem_end);
-	memblock_set_bottom_up(false);
-	if (!max_physmem_end)
-		max_physmem_end = memblock_end_of_DRAM();
-	memblock_dump_all();
-}
diff --git a/arch/s390/purgatory/head.S b/arch/s390/purgatory/head.S
index 2e3707b12edd..5a10ce34b95d 100644
--- a/arch/s390/purgatory/head.S
+++ b/arch/s390/purgatory/head.S
@@ -11,6 +11,7 @@
 #include <asm/asm-offsets.h>
 #include <asm/page.h>
 #include <asm/sigp.h>
+#include <asm/ptrace.h>
 
 /* The purgatory is the code running between two kernels. It's main purpose
  * is to verify that the next kernel was not corrupted after load and to
@@ -88,8 +89,7 @@ ENTRY(purgatory_start)
 .base_crash:
 
 	/* Setup stack */
-	larl	%r15,purgatory_end
-	aghi	%r15,-160
+	larl	%r15,purgatory_end-STACK_FRAME_OVERHEAD
 
 	/* If the next kernel is KEXEC_TYPE_CRASH the purgatory is called
 	 * directly with a flag passed in %r2 whether the purgatory shall do