more s390 updates for 6.14 merge window

- The rework that uncoupled physical and virtual address spaces
   inadvertently prevented KASAN shadow mappings from using large
   pages. Restore large page mappings for KASAN shadows
 
 - Add decompressor routine physmem_alloc() that may fail,
   unlike physmem_alloc_or_die(). This allows callers to
   implement fallback paths
 
 - Allow falling back from large pages to smaller pages (1MB or
   4KB) if the allocation of 2GB pages  in the decompressor can
   not be fulfilled
 
 - Add to the decompressor boot print support of "%%" format
   string, width and padding hadnling, length modifiers and
   decimal conversion specifiers
 
 - Add to the decompressor message severity levels similar to
   kernel ones. Support command-line options that control
   console output verbosity
 
 - Replaces boot_printk() calls with appropriate loglevel-
   specific helpers such as boot_emerg(), boot_warn(), and
   boot_debug().
 
 - Collect all boot messages into a ring buffer independent
   of the current log level. This is particularly useful for
   early crash analysis
 
 - If 'earlyprintk' command line parameter is not specified, store
   decompressor boot messages in a ring buffer to be printed later
   by the kernel, once the console driver is registered
 
 - Add 'bootdebug' command line parameter to enable printing of
   decompressor debug messages when needed. That parameters allows
   message supressing and filtering
 
 - Dump boot messages on a decompressor crash, but only if
   'bootdebug' command line parameter is enabled
 
 - When CONFIG_PRINTK_TIME is enabled, add timestamps to boot
   messages in the same format as regular printk()
 
 - Dump physical memory tracking information on boot:
   online ranges, reserved areas and vmem allocations
 
 - Dump virtual memory layout and randomization details
 
 - Improve decompression error reporting and dump the message
   ring buffer in case the boot failed and system halted
 
 - Add an exception handler which handles exceptions when FPU
   control register is attempted to be set to an invalid value.
   Remove '.fixup' section as result of this change
 
 - Use 'A', 'O', and 'R' inline assembly format flags, which
   allows recent Clang compilers to generate better FPU code
 
 - Rework uaccess code so it reads better and generates more
   efficient code
 
 - Cleanup futex inline assembly code
 
 - Disable KMSAN instrumention for futex inline assemblies, which
   contain dereferenced user pointers. Otherwise, shadows for the
   user pointers would be accessed
 
 - PFs which are not initially configured but in standby create
   only a single-function PCI domain. If they are configured later
   on, sibling PFs and their child VFs will not be added to their
   PCI domain breaking SR-IOV expectations. Fix that by allowing
   initially configured but in standby PFs create multi-function
   PCI domains
 
 - Add '-std=gnu11' to decompressor and purgatory CFLAGS to avoid
   compile errors caused by kernel's own definitions of 'bool',
   'false', and 'true' conflicting with the C23 reserved keywords
 
 - Fix sclp subsystem failure when a sclp console is not present
 
 - Fix misuse of non-NULL terminated strings in vmlogrdr driver
 
 - Various other small improvements, cleanups and fixes
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Merge tag 's390-6.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull more s390 updates from Alexander Gordeev:

 - The rework that uncoupled physical and virtual address spaces
   inadvertently prevented KASAN shadow mappings from using large pages.
   Restore large page mappings for KASAN shadows

 - Add decompressor routine physmem_alloc() that may fail, unlike
   physmem_alloc_or_die(). This allows callers to implement fallback
   paths

 - Allow falling back from large pages to smaller pages (1MB or 4KB) if
   the allocation of 2GB pages in the decompressor can not be fulfilled

 - Add to the decompressor boot print support of "%%" format string,
   width and padding hadnling, length modifiers and decimal conversion
   specifiers

 - Add to the decompressor message severity levels similar to kernel
   ones. Support command-line options that control console output
   verbosity

 - Replaces boot_printk() calls with appropriate loglevel- specific
   helpers such as boot_emerg(), boot_warn(), and boot_debug().

 - Collect all boot messages into a ring buffer independent of the
   current log level. This is particularly useful for early crash
   analysis

 - If 'earlyprintk' command line parameter is not specified, store
   decompressor boot messages in a ring buffer to be printed later by
   the kernel, once the console driver is registered

 - Add 'bootdebug' command line parameter to enable printing of
   decompressor debug messages when needed. That parameters allows
   message suppressing and filtering

 - Dump boot messages on a decompressor crash, but only if 'bootdebug'
   command line parameter is enabled

 - When CONFIG_PRINTK_TIME is enabled, add timestamps to boot messages
   in the same format as regular printk()

 - Dump physical memory tracking information on boot: online ranges,
   reserved areas and vmem allocations

 - Dump virtual memory layout and randomization details

 - Improve decompression error reporting and dump the message ring
   buffer in case the boot failed and system halted

 - Add an exception handler which handles exceptions when FPU control
   register is attempted to be set to an invalid value. Remove '.fixup'
   section as result of this change

 - Use 'A', 'O', and 'R' inline assembly format flags, which allows
   recent Clang compilers to generate better FPU code

 - Rework uaccess code so it reads better and generates more efficient
   code

 - Cleanup futex inline assembly code

 - Disable KMSAN instrumention for futex inline assemblies, which
   contain dereferenced user pointers. Otherwise, shadows for the user
   pointers would be accessed

 - PFs which are not initially configured but in standby create only a
   single-function PCI domain. If they are configured later on, sibling
   PFs and their child VFs will not be added to their PCI domain
   breaking SR-IOV expectations.

   Fix that by allowing initially configured but in standby PFs create
   multi-function PCI domains

 - Add '-std=gnu11' to decompressor and purgatory CFLAGS to avoid
   compile errors caused by kernel's own definitions of 'bool', 'false',
   and 'true' conflicting with the C23 reserved keywords

 - Fix sclp subsystem failure when a sclp console is not present

 - Fix misuse of non-NULL terminated strings in vmlogrdr driver

 - Various other small improvements, cleanups and fixes

* tag 's390-6.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (53 commits)
  s390/vmlogrdr: Use array instead of string initializer
  s390/vmlogrdr: Use internal_name for error messages
  s390/sclp: Initialize sclp subsystem via arch_cpu_finalize_init()
  s390/tools: Use array instead of string initializer
  s390/vmem: Fix null-pointer-arithmetic warning in vmem_map_init()
  s390: Add '-std=gnu11' to decompressor and purgatory CFLAGS
  s390/bitops: Use correct constraint for arch_test_bit() inline assembly
  s390/pci: Fix SR-IOV for PFs initially in standby
  s390/futex: Avoid KMSAN instrumention for user pointers
  s390/uaccess: Rename get_put_user_noinstr_attributes to uaccess_kmsan_or_inline
  s390/futex: Cleanup futex_atomic_cmpxchg_inatomic()
  s390/futex: Generate futex atomic op functions
  s390/uaccess: Remove INLINE_COPY_FROM_USER and INLINE_COPY_TO_USER
  s390/uaccess: Use asm goto for put_user()/get_user()
  s390/uaccess: Remove usage of the oac specifier
  s390/uaccess: Replace EX_TABLE_UA_LOAD_MEM exception handling
  s390/uaccess: Cleanup noinstr __put_user()/__get_user() inline assembly constraints
  s390/uaccess: Remove __put_user_fn()/__get_user_fn() wrappers
  s390/uaccess: Move put_user() / __put_user() close to put_user() asm code
  s390/uaccess: Use asm goto for __mvc_kernel_nofault()
  ...

arch/s390/Kconfig

@@ -52,13 +52,19 @@ config KASAN_SHADOW_OFFSET
 	depends on KASAN
 	default 0x1C000000000000
 
-config GCC_ASM_FLAG_OUTPUT_BROKEN
+config CC_ASM_FLAG_OUTPUT_BROKEN
 	def_bool CC_IS_GCC && GCC_VERSION < 140200
 	help
 	  GCC versions before 14.2.0 may die with an internal
 	  compiler error in some configurations if flag output
 	  operands are used within inline assemblies.
 
+config CC_HAS_ASM_AOR_FORMAT_FLAGS
+	def_bool !(CC_IS_CLANG && CLANG_VERSION < 190100)
+	help
+	  Clang versions before 19.1.0 do not support A,
+	  O, and R inline assembly format flags.
+
 config S390
 	def_bool y
 	#
@@ -72,6 +78,7 @@ config S390
 	select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
 	select ARCH_ENABLE_MEMORY_HOTREMOVE
 	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
+	select ARCH_HAS_CPU_FINALIZE_INIT
 	select ARCH_HAS_CRC32
 	select ARCH_HAS_CURRENT_STACK_POINTER
 	select ARCH_HAS_DEBUG_VIRTUAL

arch/s390/Makefile

@@ -22,7 +22,7 @@ KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__
 ifndef CONFIG_AS_IS_LLVM
 KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
 endif
-KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack
+KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack -std=gnu11
 KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
 KBUILD_CFLAGS_DECOMPRESSOR += -D__DECOMPRESSOR
 KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float -mbackchain

arch/s390/boot/als.c

@@ -46,7 +46,7 @@ void print_missing_facilities(void)
 			 * z/VM adds a four character prefix.
 			 */
 			if (strlen(als_str) > 70) {
-				boot_printk("%s\n", als_str);
+				boot_emerg("%s\n", als_str);
 				*als_str = '\0';
 			}
 			u16_to_decimal(val_str, i * BITS_PER_LONG + j);
@@ -54,7 +54,7 @@ void print_missing_facilities(void)
 			first = 0;
 		}
 	}
-	boot_printk("%s\n", als_str);
+	boot_emerg("%s\n", als_str);
 }
 
 static void facility_mismatch(void)
@@ -62,10 +62,10 @@ static void facility_mismatch(void)
 	struct cpuid id;
 
 	get_cpu_id(&id);
-	boot_printk("The Linux kernel requires more recent processor hardware\n");
+	boot_emerg("The Linux kernel requires more recent processor hardware\n");
-	boot_printk("Detected machine-type number: %4x\n", id.machine);
+	boot_emerg("Detected machine-type number: %4x\n", id.machine);
 	print_missing_facilities();
-	boot_printk("See Principles of Operations for facility bits\n");
+	boot_emerg("See Principles of Operations for facility bits\n");
 	disabled_wait();
 }
 

arch/s390/boot/boot.h

@@ -8,6 +8,7 @@
 
 #ifndef __ASSEMBLY__
 
+#include <linux/printk.h>
 #include <asm/physmem_info.h>
 
 struct machine_info {
@@ -47,13 +48,16 @@ void physmem_set_usable_limit(unsigned long limit);
 void physmem_reserve(enum reserved_range_type type, unsigned long addr, unsigned long size);
 void physmem_free(enum reserved_range_type type);
 /* for continuous/multiple allocations per type */
-unsigned long physmem_alloc_top_down(enum reserved_range_type type, unsigned long size,
+unsigned long physmem_alloc_or_die(enum reserved_range_type type, unsigned long size,
 				   unsigned long align);
+unsigned long physmem_alloc(enum reserved_range_type type, unsigned long size,
+			    unsigned long align, bool die_on_oom);
 /* for single allocations, 1 per type */
 unsigned long physmem_alloc_range(enum reserved_range_type type, unsigned long size,
 				  unsigned long align, unsigned long min, unsigned long max,
 				  bool die_on_oom);
 unsigned long get_physmem_alloc_pos(void);
+void dump_physmem_reserved(void);
 bool ipl_report_certs_intersects(unsigned long addr, unsigned long size,
 				 unsigned long *intersection_start);
 bool is_ipl_block_dump(void);
@@ -69,12 +73,28 @@ void print_pgm_check_info(void);
 unsigned long randomize_within_range(unsigned long size, unsigned long align,
 				     unsigned long min, unsigned long max);
 void setup_vmem(unsigned long kernel_start, unsigned long kernel_end, unsigned long asce_limit);
-void __printf(1, 2) boot_printk(const char *fmt, ...);
+int __printf(1, 2) boot_printk(const char *fmt, ...);
 void print_stacktrace(unsigned long sp);
 void error(char *m);
 int get_random(unsigned long limit, unsigned long *value);
+void boot_rb_dump(void);
+
+#ifndef boot_fmt
+#define boot_fmt(fmt)	fmt
+#endif
+
+#define boot_emerg(fmt, ...)	boot_printk(KERN_EMERG boot_fmt(fmt), ##__VA_ARGS__)
+#define boot_alert(fmt, ...)	boot_printk(KERN_ALERT boot_fmt(fmt), ##__VA_ARGS__)
+#define boot_crit(fmt, ...)	boot_printk(KERN_CRIT boot_fmt(fmt), ##__VA_ARGS__)
+#define boot_err(fmt, ...)	boot_printk(KERN_ERR boot_fmt(fmt), ##__VA_ARGS__)
+#define boot_warn(fmt, ...)	boot_printk(KERN_WARNING boot_fmt(fmt), ##__VA_ARGS__)
+#define boot_notice(fmt, ...)	boot_printk(KERN_NOTICE boot_fmt(fmt), ##__VA_ARGS__)
+#define boot_info(fmt, ...)	boot_printk(KERN_INFO boot_fmt(fmt), ##__VA_ARGS__)
+#define boot_debug(fmt, ...)	boot_printk(KERN_DEBUG boot_fmt(fmt), ##__VA_ARGS__)
 
 extern struct machine_info machine;
+extern int boot_console_loglevel;
+extern bool boot_ignore_loglevel;
 
 /* Symbols defined by linker scripts */
 extern const char kernel_version[];

arch/s390/boot/decompressor.c

@@ -9,6 +9,7 @@
 
 #include <linux/kernel.h>
 #include <linux/string.h>
+#include <asm/boot_data.h>
 #include <asm/page.h>
 #include "decompressor.h"
 #include "boot.h"
@@ -63,6 +64,15 @@ static unsigned long free_mem_end_ptr = (unsigned long) _end + BOOT_HEAP_SIZE;
 #include "../../../../lib/decompress_unzstd.c"
 #endif
 
+static void decompress_error(char *m)
+{
+	if (bootdebug)
+		boot_rb_dump();
+	boot_emerg("Decompression error: %s\n", m);
+	boot_emerg(" -- System halted\n");
+	disabled_wait();
+}
+
 unsigned long mem_safe_offset(void)
 {
 	return ALIGN(free_mem_end_ptr, PAGE_SIZE);
@@ -71,5 +81,5 @@ unsigned long mem_safe_offset(void)
 void deploy_kernel(void *output)
 {
 	__decompress(_compressed_start, _compressed_end - _compressed_start,
-		     NULL, NULL, output, vmlinux.image_size, NULL, error);
+		     NULL, NULL, output, vmlinux.image_size, NULL, decompress_error);
 }

arch/s390/boot/ipl_parm.c

@@ -215,7 +215,7 @@ static void check_cleared_facilities(void)
 
 	for (i = 0; i < ARRAY_SIZE(als); i++) {
 		if ((stfle_fac_list[i] & als[i]) != als[i]) {
-			boot_printk("Warning: The Linux kernel requires facilities cleared via command line option\n");
+			boot_emerg("The Linux kernel requires facilities cleared via command line option\n");
 			print_missing_facilities();
 			break;
 		}
@@ -313,5 +313,23 @@ void parse_boot_command_line(void)
 #endif
 		if (!strcmp(param, "relocate_lowcore") && test_facility(193))
 			relocate_lowcore = 1;
+		if (!strcmp(param, "earlyprintk"))
+			boot_earlyprintk = true;
+		if (!strcmp(param, "debug"))
+			boot_console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
+		if (!strcmp(param, "bootdebug")) {
+			bootdebug = true;
+			if (val)
+				strncpy(bootdebug_filter, val, sizeof(bootdebug_filter) - 1);
+		}
+		if (!strcmp(param, "quiet"))
+			boot_console_loglevel = CONSOLE_LOGLEVEL_QUIET;
+		if (!strcmp(param, "ignore_loglevel"))
+			boot_ignore_loglevel = true;
+		if (!strcmp(param, "loglevel")) {
+			boot_console_loglevel = simple_strtoull(val, NULL, 10);
+			if (boot_console_loglevel < CONSOLE_LOGLEVEL_MIN)
+				boot_console_loglevel = CONSOLE_LOGLEVEL_MIN;
+		}
 	}
 }

arch/s390/boot/ipl_report.c

@@ -30,7 +30,6 @@ static unsigned long get_cert_comp_list_size(void)
 {
 	struct ipl_rb_certificate_entry *cert;
 	struct ipl_rb_component_entry *comp;
-	size_t size;
 
 	/*
 	 * Find the length for the IPL report boot data
@@ -155,7 +154,7 @@ void save_ipl_cert_comp_list(void)
 		return;
 
 	size = get_cert_comp_list_size();
-	early_ipl_comp_list_addr = physmem_alloc_top_down(RR_CERT_COMP_LIST, size, sizeof(int));
+	early_ipl_comp_list_addr = physmem_alloc_or_die(RR_CERT_COMP_LIST, size, sizeof(int));
 	ipl_cert_list_addr = early_ipl_comp_list_addr + early_ipl_comp_list_size;
 
 	copy_components_bootdata();

arch/s390/boot/kaslr.c

@@ -32,7 +32,7 @@ struct prng_parm {
 static int check_prng(void)
 {
 	if (!cpacf_query_func(CPACF_KMC, CPACF_KMC_PRNG)) {
-		boot_printk("KASLR disabled: CPU has no PRNG\n");
+		boot_warn("KASLR disabled: CPU has no PRNG\n");
 		return 0;
 	}
 	if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
@@ -168,7 +168,7 @@ static unsigned long iterate_valid_positions(unsigned long size, unsigned long a
  * cannot have chains.
  *
  * On the other hand, "dynamic" or "repetitive" allocations are done via
- * physmem_alloc_top_down(). These allocations are tightly packed together
+ * physmem_alloc_or_die(). These allocations are tightly packed together
  * top down from the end of online memory. physmem_alloc_pos represents
  * current position where those allocations start.
  *

arch/s390/boot/pgm_check_info.c

@@ -17,13 +17,14 @@ void print_stacktrace(unsigned long sp)
 					 (unsigned long)_stack_end };
 	bool first = true;
 
-	boot_printk("Call Trace:\n");
+	boot_emerg("Call Trace:\n");
 	while (!(sp & 0x7) && on_stack(&boot_stack, sp, sizeof(struct stack_frame))) {
 		struct stack_frame *sf = (struct stack_frame *)sp;
 
-		boot_printk(first ? "(sp:%016lx [<%016lx>] %pS)\n" :
+		if (first)
-				    " sp:%016lx [<%016lx>] %pS\n",
+			boot_emerg("(sp:%016lx [<%016lx>] %pS)\n", sp, sf->gprs[8], (void *)sf->gprs[8]);
-			    sp, sf->gprs[8], (void *)sf->gprs[8]);
+		else
+			boot_emerg(" sp:%016lx [<%016lx>] %pS\n", sp, sf->gprs[8], (void *)sf->gprs[8]);
 		if (sf->back_chain <= sp)
 			break;
 		sp = sf->back_chain;
@@ -36,30 +37,30 @@ void print_pgm_check_info(void)
 	unsigned long *gpregs = (unsigned long *)get_lowcore()->gpregs_save_area;
 	struct psw_bits *psw = &psw_bits(get_lowcore()->psw_save_area);
 
-	boot_printk("Linux version %s\n", kernel_version);
+	if (bootdebug)
+		boot_rb_dump();
+	boot_emerg("Linux version %s\n", kernel_version);
 	if (!is_prot_virt_guest() && early_command_line[0])
-		boot_printk("Kernel command line: %s\n", early_command_line);
+		boot_emerg("Kernel command line: %s\n", early_command_line);
-	boot_printk("Kernel fault: interruption code %04x ilc:%x\n",
+	boot_emerg("Kernel fault: interruption code %04x ilc:%d\n",
 		   get_lowcore()->pgm_code, get_lowcore()->pgm_ilc >> 1);
 	if (kaslr_enabled()) {
-		boot_printk("Kernel random base: %lx\n", __kaslr_offset);
+		boot_emerg("Kernel random base: %lx\n", __kaslr_offset);
-		boot_printk("Kernel random base phys: %lx\n", __kaslr_offset_phys);
+		boot_emerg("Kernel random base phys: %lx\n", __kaslr_offset_phys);
 	}
-	boot_printk("PSW : %016lx %016lx (%pS)\n",
+	boot_emerg("PSW : %016lx %016lx (%pS)\n",
 		   get_lowcore()->psw_save_area.mask,
 		   get_lowcore()->psw_save_area.addr,
 		   (void *)get_lowcore()->psw_save_area.addr);
-	boot_printk(
+	boot_emerg("      R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x P:%x AS:%x CC:%x PM:%x RI:%x EA:%x\n",
-		"      R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x P:%x AS:%x CC:%x PM:%x RI:%x EA:%x\n",
 		   psw->per, psw->dat, psw->io, psw->ext, psw->key, psw->mcheck,
-		psw->wait, psw->pstate, psw->as, psw->cc, psw->pm, psw->ri,
+		   psw->wait, psw->pstate, psw->as, psw->cc, psw->pm, psw->ri, psw->eaba);
-		psw->eaba);
+	boot_emerg("GPRS: %016lx %016lx %016lx %016lx\n", gpregs[0], gpregs[1], gpregs[2], gpregs[3]);
-	boot_printk("GPRS: %016lx %016lx %016lx %016lx\n", gpregs[0], gpregs[1], gpregs[2], gpregs[3]);
+	boot_emerg("      %016lx %016lx %016lx %016lx\n", gpregs[4], gpregs[5], gpregs[6], gpregs[7]);
-	boot_printk("      %016lx %016lx %016lx %016lx\n", gpregs[4], gpregs[5], gpregs[6], gpregs[7]);
+	boot_emerg("      %016lx %016lx %016lx %016lx\n", gpregs[8], gpregs[9], gpregs[10], gpregs[11]);
-	boot_printk("      %016lx %016lx %016lx %016lx\n", gpregs[8], gpregs[9], gpregs[10], gpregs[11]);
+	boot_emerg("      %016lx %016lx %016lx %016lx\n", gpregs[12], gpregs[13], gpregs[14], gpregs[15]);
-	boot_printk("      %016lx %016lx %016lx %016lx\n", gpregs[12], gpregs[13], gpregs[14], gpregs[15]);
 	print_stacktrace(get_lowcore()->gpregs_save_area[15]);
-	boot_printk("Last Breaking-Event-Address:\n");
+	boot_emerg("Last Breaking-Event-Address:\n");
-	boot_printk(" [<%016lx>] %pS\n", (unsigned long)get_lowcore()->pgm_last_break,
+	boot_emerg(" [<%016lx>] %pS\n", (unsigned long)get_lowcore()->pgm_last_break,
 		   (void *)get_lowcore()->pgm_last_break);
 }

arch/s390/boot/physmem_info.c

@@ -1,4 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
+#define boot_fmt(fmt) "physmem: " fmt
 #include <linux/processor.h>
 #include <linux/errno.h>
 #include <linux/init.h>
@@ -28,7 +29,7 @@ static struct physmem_range *__get_physmem_range_ptr(u32 n)
 		return &physmem_info.online[n];
 	if (unlikely(!physmem_info.online_extended)) {
 		physmem_info.online_extended = (struct physmem_range *)physmem_alloc_range(
-			RR_MEM_DETECT_EXTENDED, ENTRIES_EXTENDED_MAX, sizeof(long), 0,
+			RR_MEM_DETECT_EXT, ENTRIES_EXTENDED_MAX, sizeof(long), 0,
 			physmem_alloc_pos, true);
 	}
 	return &physmem_info.online_extended[n - MEM_INLINED_ENTRIES];
@@ -207,11 +208,16 @@ unsigned long detect_max_physmem_end(void)
 		max_physmem_end = search_mem_end();
 		physmem_info.info_source = MEM_DETECT_BIN_SEARCH;
 	}
+	boot_debug("Max physical memory: 0x%016lx (info source: %s)\n", max_physmem_end,
+		   get_physmem_info_source());
 	return max_physmem_end;
 }
 
 void detect_physmem_online_ranges(unsigned long max_physmem_end)
 {
+	unsigned long start, end;
+	int i;
+
 	if (!sclp_early_read_storage_info()) {
 		physmem_info.info_source = MEM_DETECT_SCLP_STOR_INFO;
 	} else if (physmem_info.info_source == MEM_DETECT_DIAG500_STOR_LIMIT) {
@@ -226,12 +232,16 @@ void detect_physmem_online_ranges(unsigned long max_physmem_end)
 	} else if (max_physmem_end) {
 		add_physmem_online_range(0, max_physmem_end);
 	}
+	boot_debug("Online memory ranges (info source: %s):\n", get_physmem_info_source());
+	for_each_physmem_online_range(i, &start, &end)
+		boot_debug(" online [%d]:   0x%016lx-0x%016lx\n", i, start, end);
 }
 
 void physmem_set_usable_limit(unsigned long limit)
 {
 	physmem_info.usable = limit;
 	physmem_alloc_pos = limit;
+	boot_debug("Usable memory limit: 0x%016lx\n", limit);
 }
 
 static void die_oom(unsigned long size, unsigned long align, unsigned long min, unsigned long max)
@@ -241,38 +251,47 @@ static void die_oom(unsigned long size, unsigned long align, unsigned long min,
 	enum reserved_range_type t;
 	int i;
 
-	boot_printk("Linux version %s\n", kernel_version);
+	boot_emerg("Linux version %s\n", kernel_version);
 	if (!is_prot_virt_guest() && early_command_line[0])
-		boot_printk("Kernel command line: %s\n", early_command_line);
+		boot_emerg("Kernel command line: %s\n", early_command_line);
-	boot_printk("Out of memory allocating %lx bytes %lx aligned in range %lx:%lx\n",
+	boot_emerg("Out of memory allocating %lu bytes 0x%lx aligned in range %lx:%lx\n",
 		   size, align, min, max);
-	boot_printk("Reserved memory ranges:\n");
+	boot_emerg("Reserved memory ranges:\n");
 	for_each_physmem_reserved_range(t, range, &start, &end) {
-		boot_printk("%016lx %016lx %s\n", start, end, get_rr_type_name(t));
+		boot_emerg("%016lx %016lx %s\n", start, end, get_rr_type_name(t));
 		total_reserved_mem += end - start;
 	}
-	boot_printk("Usable online memory ranges (info source: %s [%x]):\n",
+	boot_emerg("Usable online memory ranges (info source: %s [%d]):\n",
 		   get_physmem_info_source(), physmem_info.info_source);
 	for_each_physmem_usable_range(i, &start, &end) {
-		boot_printk("%016lx %016lx\n", start, end);
+		boot_emerg("%016lx %016lx\n", start, end);
 		total_mem += end - start;
 	}
-	boot_printk("Usable online memory total: %lx Reserved: %lx Free: %lx\n",
+	boot_emerg("Usable online memory total: %lu Reserved: %lu Free: %lu\n",
 		   total_mem, total_reserved_mem,
 		   total_mem > total_reserved_mem ? total_mem - total_reserved_mem : 0);
 	print_stacktrace(current_frame_address());
-	boot_printk("\n\n -- System halted\n");
+	boot_emerg(" -- System halted\n");
 	disabled_wait();
 }
 
-void physmem_reserve(enum reserved_range_type type, unsigned long addr, unsigned long size)
+static void _physmem_reserve(enum reserved_range_type type, unsigned long addr, unsigned long size)
 {
 	physmem_info.reserved[type].start = addr;
 	physmem_info.reserved[type].end = addr + size;
 }
 
+void physmem_reserve(enum reserved_range_type type, unsigned long addr, unsigned long size)
+{
+	_physmem_reserve(type, addr, size);
+	boot_debug("%-14s 0x%016lx-0x%016lx %s\n", "Reserve:", addr, addr + size,
+		   get_rr_type_name(type));
+}
+
 void physmem_free(enum reserved_range_type type)
 {
+	boot_debug("%-14s 0x%016lx-0x%016lx %s\n", "Free:", physmem_info.reserved[type].start,
+		   physmem_info.reserved[type].end, get_rr_type_name(type));
 	physmem_info.reserved[type].start = 0;
 	physmem_info.reserved[type].end = 0;
 }
@@ -339,41 +358,73 @@ unsigned long physmem_alloc_range(enum reserved_range_type type, unsigned long s
 	max = min(max, physmem_alloc_pos);
 	addr = __physmem_alloc_range(size, align, min, max, 0, NULL, die_on_oom);
 	if (addr)
-		physmem_reserve(type, addr, size);
+		_physmem_reserve(type, addr, size);
+	boot_debug("%-14s 0x%016lx-0x%016lx %s\n", "Alloc range:", addr, addr + size,
+		   get_rr_type_name(type));
 	return addr;
 }
 
-unsigned long physmem_alloc_top_down(enum reserved_range_type type, unsigned long size,
+unsigned long physmem_alloc(enum reserved_range_type type, unsigned long size,
-				     unsigned long align)
+			    unsigned long align, bool die_on_oom)
 {
 	struct reserved_range *range = &physmem_info.reserved[type];
-	struct reserved_range *new_range;
+	struct reserved_range *new_range = NULL;
 	unsigned int ranges_left;
 	unsigned long addr;
 
 	addr = __physmem_alloc_range(size, align, 0, physmem_alloc_pos, physmem_alloc_ranges,
-				     &ranges_left, true);
+				     &ranges_left, die_on_oom);
+	if (!addr)
+		return 0;
 	/* if not a consecutive allocation of the same type or first allocation */
 	if (range->start != addr + size) {
 		if (range->end) {
-			physmem_alloc_pos = __physmem_alloc_range(
+			addr = __physmem_alloc_range(sizeof(struct reserved_range), 0, 0,
-				sizeof(struct reserved_range), 0, 0, physmem_alloc_pos,
+						     physmem_alloc_pos, physmem_alloc_ranges,
-				physmem_alloc_ranges, &ranges_left, true);
+						     &ranges_left, true);
-			new_range = (struct reserved_range *)physmem_alloc_pos;
+			new_range = (struct reserved_range *)addr;
+			addr = __physmem_alloc_range(size, align, 0, addr, ranges_left,
+						     &ranges_left, die_on_oom);
+			if (!addr)
+				return 0;
 			*new_range = *range;
 			range->chain = new_range;
-			addr = __physmem_alloc_range(size, align, 0, physmem_alloc_pos,
-						     ranges_left, &ranges_left, true);
 		}
 		range->end = addr + size;
 	}
+	if (type != RR_VMEM) {
+		boot_debug("%-14s 0x%016lx-0x%016lx %-20s align 0x%lx split %d\n", "Alloc topdown:",
+			   addr, addr + size, get_rr_type_name(type), align, !!new_range);
+	}
 	range->start = addr;
 	physmem_alloc_pos = addr;
 	physmem_alloc_ranges = ranges_left;
 	return addr;
 }
 
+unsigned long physmem_alloc_or_die(enum reserved_range_type type, unsigned long size,
+				   unsigned long align)
+{
+	return physmem_alloc(type, size, align, true);
+}
+
 unsigned long get_physmem_alloc_pos(void)
 {
 	return physmem_alloc_pos;
 }
+
+void dump_physmem_reserved(void)
+{
+	struct reserved_range *range;
+	enum reserved_range_type t;
+	unsigned long start, end;
+
+	boot_debug("Reserved memory ranges:\n");
+	for_each_physmem_reserved_range(t, range, &start, &end) {
+		if (end) {
+			boot_debug("%-14s 0x%016lx-0x%016lx @%012lx chain %012lx\n",
+				   get_rr_type_name(t), start, end, (unsigned long)range,
+				   (unsigned long)range->chain);
+		}
+	}
+}

arch/s390/boot/printk.c

@@ -5,21 +5,111 @@
 #include <linux/ctype.h>
 #include <asm/stacktrace.h>
 #include <asm/boot_data.h>
+#include <asm/sections.h>
 #include <asm/lowcore.h>
 #include <asm/setup.h>
 #include <asm/sclp.h>
 #include <asm/uv.h>
 #include "boot.h"
 
+int boot_console_loglevel = CONFIG_CONSOLE_LOGLEVEL_DEFAULT;
+bool boot_ignore_loglevel;
+char __bootdata(boot_rb)[PAGE_SIZE * 2];
+bool __bootdata(boot_earlyprintk);
+size_t __bootdata(boot_rb_off);
+char __bootdata(bootdebug_filter)[128];
+bool __bootdata(bootdebug);
+
+static void boot_rb_add(const char *str, size_t len)
+{
+	/* leave double '\0' in the end */
+	size_t avail = sizeof(boot_rb) - boot_rb_off - 1;
+
+	/* store strings separated by '\0' */
+	if (len + 1 > avail)
+		boot_rb_off = 0;
+	strcpy(boot_rb + boot_rb_off, str);
+	boot_rb_off += len + 1;
+}
+
+static void print_rb_entry(const char *str)
+{
+	sclp_early_printk(printk_skip_level(str));
+}
+
+static bool debug_messages_printed(void)
+{
+	return boot_earlyprintk && (boot_ignore_loglevel || boot_console_loglevel > LOGLEVEL_DEBUG);
+}
+
+void boot_rb_dump(void)
+{
+	if (debug_messages_printed())
+		return;
+	sclp_early_printk("Boot messages ring buffer:\n");
+	boot_rb_foreach(print_rb_entry);
+}
+
 const char hex_asc[] = "0123456789abcdef";
 
 static char *as_hex(char *dst, unsigned long val, int pad)
 {
-	char *p, *end = p = dst + max(pad, (int)__fls(val | 1) / 4 + 1);
+	char *p = dst + max(pad, (int)__fls(val | 1) / 4 + 1);
 
-	for (*p-- = 0; p >= dst; val >>= 4)
+	for (*p-- = '\0'; p >= dst; val >>= 4)
 		*p-- = hex_asc[val & 0x0f];
-	return end;
+	return dst;
+}
+
+#define MAX_NUMLEN 21
+static char *as_dec(char *buf, unsigned long val, bool is_signed)
+{
+	bool negative = false;
+	char *p = buf + MAX_NUMLEN;
+
+	if (is_signed && (long)val < 0) {
+		val = (val == LONG_MIN ? LONG_MIN : -(long)val);
+		negative = true;
+	}
+
+	*--p = '\0';
+	do {
+		*--p = '0' + (val % 10);
+		val /= 10;
+	} while (val);
+
+	if (negative)
+		*--p = '-';
+	return p;
+}
+
+static ssize_t strpad(char *dst, size_t dst_size, const char *src,
+		      int _pad, bool zero_pad, bool decimal)
+{
+	ssize_t len = strlen(src), pad = _pad;
+	char *p = dst;
+
+	if (max(len, abs(pad)) >= dst_size)
+		return -E2BIG;
+
+	if (pad > len) {
+		if (decimal && zero_pad && *src == '-') {
+			*p++ = '-';
+			src++;
+			len--;
+			pad--;
+		}
+		memset(p, zero_pad ? '0' : ' ', pad - len);
+		p += pad - len;
+	}
+	memcpy(p, src, len);
+	p += len;
+	if (pad < 0 && -pad > len) {
+		memset(p, ' ', -pad - len);
+		p += -pad - len;
+	}
+	*p = '\0';
+	return p - dst;
 }
 
 static char *symstart(char *p)
@@ -58,35 +148,94 @@ static noinline char *findsym(unsigned long ip, unsigned short *off, unsigned sh
 	return NULL;
 }
 
-static noinline char *strsym(void *ip)
+#define MAX_SYMLEN 64
+static noinline char *strsym(char *buf, void *ip)
 {
-	static char buf[64];
 	unsigned short off;
 	unsigned short len;
 	char *p;
 
 	p = findsym((unsigned long)ip, &off, &len);
 	if (p) {
-		strncpy(buf, p, sizeof(buf));
+		strncpy(buf, p, MAX_SYMLEN);
 		/* reserve 15 bytes for offset/len in symbol+0x1234/0x1234 */
-		p = buf + strnlen(buf, sizeof(buf) - 15);
+		p = buf + strnlen(buf, MAX_SYMLEN - 15);
 		strcpy(p, "+0x");
-		p = as_hex(p + 3, off, 0);
+		as_hex(p + 3, off, 0);
-		strcpy(p, "/0x");
+		strcat(p, "/0x");
-		as_hex(p + 3, len, 0);
+		as_hex(p + strlen(p), len, 0);
 	} else {
 		as_hex(buf, (unsigned long)ip, 16);
 	}
 	return buf;
 }
 
-void boot_printk(const char *fmt, ...)
+static inline int printk_loglevel(const char *buf)
+{
+	if (buf[0] == KERN_SOH_ASCII && buf[1]) {
+		switch (buf[1]) {
+		case '0' ... '7':
+			return buf[1] - '0';
+		}
+	}
+	return MESSAGE_LOGLEVEL_DEFAULT;
+}
+
+static void boot_console_earlyprintk(const char *buf)
+{
+	int level = printk_loglevel(buf);
+
+	/* always print emergency messages */
+	if (level > LOGLEVEL_EMERG && !boot_earlyprintk)
+		return;
+	buf = printk_skip_level(buf);
+	/* print debug messages only when bootdebug is enabled */
+	if (level == LOGLEVEL_DEBUG && (!bootdebug || !bootdebug_filter_match(skip_timestamp(buf))))
+		return;
+	if (boot_ignore_loglevel || level < boot_console_loglevel)
+		sclp_early_printk(buf);
+}
+
+static char *add_timestamp(char *buf)
+{
+#ifdef CONFIG_PRINTK_TIME
+	union tod_clock *boot_clock = (union tod_clock *)&get_lowcore()->boot_clock;
+	unsigned long ns = tod_to_ns(get_tod_clock() - boot_clock->tod);
+	char ts[MAX_NUMLEN];
+
+	*buf++ = '[';
+	buf += strpad(buf, MAX_NUMLEN, as_dec(ts, ns / NSEC_PER_SEC, 0), 5, 0, 0);
+	*buf++ = '.';
+	buf += strpad(buf, MAX_NUMLEN, as_dec(ts, (ns % NSEC_PER_SEC) / NSEC_PER_USEC, 0), 6, 1, 0);
+	*buf++ = ']';
+	*buf++ = ' ';
+#endif
+	return buf;
+}
+
+#define va_arg_len_type(args, lenmod, typemod)				\
+	((lenmod == 'l') ? va_arg(args, typemod long) :			\
+	 (lenmod == 'h') ? (typemod short)va_arg(args, typemod int) :	\
+	 (lenmod == 'H') ? (typemod char)va_arg(args, typemod int) :	\
+	 (lenmod == 'z') ? va_arg(args, typemod long) :			\
+			   va_arg(args, typemod int))
+
+int boot_printk(const char *fmt, ...)
 {
 	char buf[1024] = { 0 };
 	char *end = buf + sizeof(buf) - 1; /* make sure buf is 0 terminated */
-	unsigned long pad;
+	bool zero_pad, decimal;
-	char *p = buf;
+	char *strval, *p = buf;
+	char valbuf[MAX(MAX_SYMLEN, MAX_NUMLEN)];
 	va_list args;
+	char lenmod;
+	ssize_t len;
+	int pad;
+
+	*p++ = KERN_SOH_ASCII;
+	*p++ = printk_get_level(fmt) ?: '0' + MESSAGE_LOGLEVEL_DEFAULT;
+	p = add_timestamp(p);
+	fmt = printk_skip_level(fmt);
 
 	va_start(args, fmt);
 	for (; p < end && *fmt; fmt++) {
@@ -94,31 +243,56 @@ void boot_printk(const char *fmt, ...)
 			*p++ = *fmt;
 			continue;
 		}
-		pad = isdigit(*++fmt) ? simple_strtol(fmt, (char **)&fmt, 10) : 0;
+		if (*++fmt == '%') {
+			*p++ = '%';
+			continue;
+		}
+		zero_pad = (*fmt == '0');
+		pad = simple_strtol(fmt, (char **)&fmt, 10);
+		lenmod = (*fmt == 'h' || *fmt == 'l' || *fmt == 'z') ? *fmt++ : 0;
+		if (lenmod == 'h' && *fmt == 'h') {
+			lenmod = 'H';
+			fmt++;
+		}
+		decimal = false;
 		switch (*fmt) {
 		case 's':
-			p = buf + strlcat(buf, va_arg(args, char *), sizeof(buf));
+			if (lenmod)
+				goto out;
+			strval = va_arg(args, char *);
+			zero_pad = false;
 			break;
 		case 'p':
-			if (*++fmt != 'S')
+			if (*++fmt != 'S' || lenmod)
 				goto out;
-			p = buf + strlcat(buf, strsym(va_arg(args, void *)), sizeof(buf));
+			strval = strsym(valbuf, va_arg(args, void *));
+			zero_pad = false;
 			break;
-		case 'l':
+		case 'd':
-			if (*++fmt != 'x' || end - p <= max(sizeof(long) * 2, pad))
+		case 'i':
-				goto out;
+			strval = as_dec(valbuf, va_arg_len_type(args, lenmod, signed), 1);
-			p = as_hex(p, va_arg(args, unsigned long), pad);
+			decimal = true;
+			break;
+		case 'u':
+			strval = as_dec(valbuf, va_arg_len_type(args, lenmod, unsigned), 0);
 			break;
 		case 'x':
-			if (end - p <= max(sizeof(int) * 2, pad))
+			strval = as_hex(valbuf, va_arg_len_type(args, lenmod, unsigned), 0);
-				goto out;
-			p = as_hex(p, va_arg(args, unsigned int), pad);
 			break;
 		default:
 			goto out;
 		}
+		len = strpad(p, end - p, strval, pad, zero_pad, decimal);
+		if (len == -E2BIG)
+			break;
+		p += len;
 	}
 out:
 	va_end(args);
-	sclp_early_printk(buf);
+	len = strlen(buf);
+	if (len) {
+		boot_rb_add(buf, len);
+		boot_console_earlyprintk(buf);
+	}
+	return len;
 }

arch/s390/boot/startup.c

@@ -1,4 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
+#define boot_fmt(fmt) "startup: " fmt
 #include <linux/string.h>
 #include <linux/elf.h>
 #include <asm/page-states.h>
@@ -42,7 +43,8 @@ struct machine_info machine;
 
 void error(char *x)
 {
-	boot_printk("\n\n%s\n\n -- System halted", x);
+	boot_emerg("%s\n", x);
+	boot_emerg(" -- System halted\n");
 	disabled_wait();
 }
 
@@ -143,7 +145,7 @@ static void rescue_initrd(unsigned long min, unsigned long max)
 		return;
 	old_addr = addr;
 	physmem_free(RR_INITRD);
-	addr = physmem_alloc_top_down(RR_INITRD, size, 0);
+	addr = physmem_alloc_or_die(RR_INITRD, size, 0);
 	memmove((void *)addr, (void *)old_addr, size);
 }
 
@@ -222,12 +224,16 @@ static void setup_ident_map_size(unsigned long max_physmem_end)
 	if (oldmem_data.start) {
 		__kaslr_enabled = 0;
 		ident_map_size = min(ident_map_size, oldmem_data.size);
+		boot_debug("kdump memory limit:  0x%016lx\n", oldmem_data.size);
 	} else if (ipl_block_valid && is_ipl_block_dump()) {
 		__kaslr_enabled = 0;
-		if (!sclp_early_get_hsa_size(&hsa_size) && hsa_size)
+		if (!sclp_early_get_hsa_size(&hsa_size) && hsa_size) {
 			ident_map_size = min(ident_map_size, hsa_size);
+			boot_debug("Stand-alone dump limit: 0x%016lx\n", hsa_size);
+		}
 	}
 #endif
+	boot_debug("Identity map size:   0x%016lx\n", ident_map_size);
 }
 
 #define FIXMAP_SIZE	round_up(MEMCPY_REAL_SIZE + ABS_LOWCORE_MAP_SIZE, sizeof(struct lowcore))
@@ -267,6 +273,7 @@ static unsigned long setup_kernel_memory_layout(unsigned long kernel_size)
 	BUILD_BUG_ON(!IS_ALIGNED(__NO_KASLR_START_KERNEL, THREAD_SIZE));
 	BUILD_BUG_ON(__NO_KASLR_END_KERNEL > _REGION1_SIZE);
 	vsize = get_vmem_size(ident_map_size, vmemmap_size, vmalloc_size, _REGION3_SIZE);
+	boot_debug("vmem size estimated: 0x%016lx\n", vsize);
 	if (IS_ENABLED(CONFIG_KASAN) || __NO_KASLR_END_KERNEL > _REGION2_SIZE ||
 	    (vsize > _REGION2_SIZE && kaslr_enabled())) {
 		asce_limit = _REGION1_SIZE;
@@ -290,8 +297,10 @@ static unsigned long setup_kernel_memory_layout(unsigned long kernel_size)
 	 * otherwise asce_limit and rte_size would have been adjusted.
 	 */
 	vmax = adjust_to_uv_max(asce_limit);
+	boot_debug("%d level paging       0x%016lx vmax\n", vmax == _REGION1_SIZE ? 4 : 3, vmax);
 #ifdef CONFIG_KASAN
 	BUILD_BUG_ON(__NO_KASLR_END_KERNEL > KASAN_SHADOW_START);
+	boot_debug("KASAN shadow area:   0x%016lx-0x%016lx\n", KASAN_SHADOW_START, KASAN_SHADOW_END);
 	/* force vmalloc and modules below kasan shadow */
 	vmax = min(vmax, KASAN_SHADOW_START);
 #endif
@@ -305,19 +314,27 @@ static unsigned long setup_kernel_memory_layout(unsigned long kernel_size)
 			pos = 0;
 		kernel_end = vmax - pos * THREAD_SIZE;
 		kernel_start = round_down(kernel_end - kernel_size, THREAD_SIZE);
+		boot_debug("Randomization range: 0x%016lx-0x%016lx\n", vmax - kaslr_len, vmax);
+		boot_debug("kernel image:        0x%016lx-0x%016lx (kaslr)\n", kernel_start,
+			   kernel_size + kernel_size);
 	} else if (vmax < __NO_KASLR_END_KERNEL || vsize > __NO_KASLR_END_KERNEL) {
 		kernel_start = round_down(vmax - kernel_size, THREAD_SIZE);
-		boot_printk("The kernel base address is forced to %lx\n", kernel_start);
+		boot_debug("kernel image:        0x%016lx-0x%016lx (constrained)\n", kernel_start,
+			   kernel_start + kernel_size);
 	} else {
 		kernel_start = __NO_KASLR_START_KERNEL;
+		boot_debug("kernel image:        0x%016lx-0x%016lx (nokaslr)\n", kernel_start,
+			   kernel_start + kernel_size);
 	}
 	__kaslr_offset = kernel_start;
+	boot_debug("__kaslr_offset:      0x%016lx\n", __kaslr_offset);
 
 	MODULES_END = round_down(kernel_start, _SEGMENT_SIZE);
 	MODULES_VADDR = MODULES_END - MODULES_LEN;
 	VMALLOC_END = MODULES_VADDR;
 	if (IS_ENABLED(CONFIG_KMSAN))
 		VMALLOC_END -= MODULES_LEN * 2;
+	boot_debug("modules area:        0x%016lx-0x%016lx\n", MODULES_VADDR, MODULES_END);
 
 	/* allow vmalloc area to occupy up to about 1/2 of the rest virtual space left */
 	vsize = (VMALLOC_END - FIXMAP_SIZE) / 2;
@@ -329,10 +346,15 @@ static unsigned long setup_kernel_memory_layout(unsigned long kernel_size)
 		VMALLOC_END -= vmalloc_size * 2;
 	}
 	VMALLOC_START = VMALLOC_END - vmalloc_size;
+	boot_debug("vmalloc area:        0x%016lx-0x%016lx\n", VMALLOC_START, VMALLOC_END);
 
 	__memcpy_real_area = round_down(VMALLOC_START - MEMCPY_REAL_SIZE, PAGE_SIZE);
+	boot_debug("memcpy real area:    0x%016lx-0x%016lx\n", __memcpy_real_area,
+		   __memcpy_real_area + MEMCPY_REAL_SIZE);
 	__abs_lowcore = round_down(__memcpy_real_area - ABS_LOWCORE_MAP_SIZE,
 				   sizeof(struct lowcore));
+	boot_debug("abs lowcore:         0x%016lx-0x%016lx\n", __abs_lowcore,
+		   __abs_lowcore + ABS_LOWCORE_MAP_SIZE);
 
 	/* split remaining virtual space between 1:1 mapping & vmemmap array */
 	pages = __abs_lowcore / (PAGE_SIZE + sizeof(struct page));
@@ -352,8 +374,11 @@ static unsigned long setup_kernel_memory_layout(unsigned long kernel_size)
 	BUILD_BUG_ON(MAX_DCSS_ADDR > (1UL << MAX_PHYSMEM_BITS));
 	max_mappable = max(ident_map_size, MAX_DCSS_ADDR);
 	max_mappable = min(max_mappable, vmemmap_start);
-	if (IS_ENABLED(CONFIG_RANDOMIZE_IDENTITY_BASE))
+#ifdef CONFIG_RANDOMIZE_IDENTITY_BASE
 	__identity_base = round_down(vmemmap_start - max_mappable, rte_size);
+#endif
+	boot_debug("identity map:        0x%016lx-0x%016lx\n", __identity_base,
+		   __identity_base + ident_map_size);
 
 	return asce_limit;
 }
@@ -412,6 +437,10 @@ void startup_kernel(void)
 	psw_t psw;
 
 	setup_lpp();
+	store_ipl_parmblock();
+	uv_query_info();
+	setup_boot_command_line();
+	parse_boot_command_line();
 
 	/*
 	 * Non-randomized kernel physical start address must be _SEGMENT_SIZE
@@ -431,12 +460,8 @@ void startup_kernel(void)
 	oldmem_data.start = parmarea.oldmem_base;
 	oldmem_data.size = parmarea.oldmem_size;
 
-	store_ipl_parmblock();
 	read_ipl_report();
-	uv_query_info();
 	sclp_early_read_info();
-	setup_boot_command_line();
-	parse_boot_command_line();
 	detect_facilities();
 	cmma_init();
 	sanitize_prot_virt_host();
@@ -526,6 +551,7 @@ void startup_kernel(void)
 			    __kaslr_offset, __kaslr_offset_phys);
 	kaslr_adjust_got(__kaslr_offset);
 	setup_vmem(__kaslr_offset, __kaslr_offset + kernel_size, asce_limit);
+	dump_physmem_reserved();
 	copy_bootdata();
 	__apply_alternatives((struct alt_instr *)_vmlinux_info.alt_instructions,
 			     (struct alt_instr *)_vmlinux_info.alt_instructions_end,
@@ -542,5 +568,6 @@ void startup_kernel(void)
 	 */
 	psw.addr = __kaslr_offset + vmlinux.entry;
 	psw.mask = PSW_KERNEL_BITS;
+	boot_debug("Starting kernel at:  0x%016lx\n", psw.addr);
 	__load_psw(psw);
 }

arch/s390/boot/vmem.c

@@ -1,4 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
+#define boot_fmt(fmt) "vmem: " fmt
 #include <linux/sched/task.h>
 #include <linux/pgtable.h>
 #include <linux/kasan.h>
@@ -13,6 +14,7 @@
 #include "decompressor.h"
 #include "boot.h"
 
+#define INVALID_PHYS_ADDR (~(phys_addr_t)0)
 struct ctlreg __bootdata_preserved(s390_invalid_asce);
 
 #ifdef CONFIG_PROC_FS
@@ -31,12 +33,42 @@ enum populate_mode {
 	POPULATE_IDENTITY,
 	POPULATE_KERNEL,
 #ifdef CONFIG_KASAN
+	/* KASAN modes should be last and grouped together, see is_kasan_populate_mode() */
 	POPULATE_KASAN_MAP_SHADOW,
 	POPULATE_KASAN_ZERO_SHADOW,
 	POPULATE_KASAN_SHALLOW
 #endif
 };
 
+#define POPULATE_MODE_NAME(t) case POPULATE_ ## t: return #t
+static inline const char *get_populate_mode_name(enum populate_mode t)
+{
+	switch (t) {
+	POPULATE_MODE_NAME(NONE);
+	POPULATE_MODE_NAME(DIRECT);
+	POPULATE_MODE_NAME(LOWCORE);
+	POPULATE_MODE_NAME(ABS_LOWCORE);
+	POPULATE_MODE_NAME(IDENTITY);
+	POPULATE_MODE_NAME(KERNEL);
+#ifdef CONFIG_KASAN
+	POPULATE_MODE_NAME(KASAN_MAP_SHADOW);
+	POPULATE_MODE_NAME(KASAN_ZERO_SHADOW);
+	POPULATE_MODE_NAME(KASAN_SHALLOW);
+#endif
+	default:
+		return "UNKNOWN";
+	}
+}
+
+static bool is_kasan_populate_mode(enum populate_mode mode)
+{
+#ifdef CONFIG_KASAN
+	return mode >= POPULATE_KASAN_MAP_SHADOW;
+#else
+	return false;
+#endif
+}
+
 static void pgtable_populate(unsigned long addr, unsigned long end, enum populate_mode mode);
 
 #ifdef CONFIG_KASAN
@@ -52,9 +84,12 @@ static pte_t pte_z;
 
 static inline void kasan_populate(unsigned long start, unsigned long end, enum populate_mode mode)
 {
-	start = PAGE_ALIGN_DOWN(__sha(start));
+	unsigned long sha_start = PAGE_ALIGN_DOWN(__sha(start));
-	end = PAGE_ALIGN(__sha(end));
+	unsigned long sha_end = PAGE_ALIGN(__sha(end));
-	pgtable_populate(start, end, mode);
+
+	boot_debug("%-17s 0x%016lx-0x%016lx >> 0x%016lx-0x%016lx\n", get_populate_mode_name(mode),
+		   start, end, sha_start, sha_end);
+	pgtable_populate(sha_start, sha_end, mode);
 }
 
 static void kasan_populate_shadow(unsigned long kernel_start, unsigned long kernel_end)
@@ -200,7 +235,7 @@ static void *boot_crst_alloc(unsigned long val)
 	unsigned long size = PAGE_SIZE << CRST_ALLOC_ORDER;
 	unsigned long *table;
 
-	table = (unsigned long *)physmem_alloc_top_down(RR_VMEM, size, size);
+	table = (unsigned long *)physmem_alloc_or_die(RR_VMEM, size, size);
 	crst_table_init(table, val);
 	__arch_set_page_dat(table, 1UL << CRST_ALLOC_ORDER);
 	return table;
@@ -216,7 +251,7 @@ static pte_t *boot_pte_alloc(void)
 	 * during POPULATE_KASAN_MAP_SHADOW when EDAT is off
 	 */
 	if (!pte_leftover) {
-		pte_leftover = (void *)physmem_alloc_top_down(RR_VMEM, PAGE_SIZE, PAGE_SIZE);
+		pte_leftover = (void *)physmem_alloc_or_die(RR_VMEM, PAGE_SIZE, PAGE_SIZE);
 		pte = pte_leftover + _PAGE_TABLE_SIZE;
 		__arch_set_page_dat(pte, 1);
 	} else {
@@ -228,11 +263,12 @@ static pte_t *boot_pte_alloc(void)
 	return pte;
 }
 
-static unsigned long _pa(unsigned long addr, unsigned long size, enum populate_mode mode)
+static unsigned long resolve_pa_may_alloc(unsigned long addr, unsigned long size,
+					  enum populate_mode mode)
 {
 	switch (mode) {
 	case POPULATE_NONE:
-		return -1;
+		return INVALID_PHYS_ADDR;
 	case POPULATE_DIRECT:
 		return addr;
 	case POPULATE_LOWCORE:
@@ -245,38 +281,64 @@ static unsigned long _pa(unsigned long addr, unsigned long size, enum populate_m
 		return __identity_pa(addr);
 #ifdef CONFIG_KASAN
 	case POPULATE_KASAN_MAP_SHADOW:
-		addr = physmem_alloc_top_down(RR_VMEM, size, size);
+		/* Allow to fail large page allocations, this will fall back to 1mb/4k pages */
+		addr = physmem_alloc(RR_VMEM, size, size, size == PAGE_SIZE);
+		if (addr) {
 			memset((void *)addr, 0, size);
 			return addr;
+		}
+		return INVALID_PHYS_ADDR;
 #endif
 	default:
-		return -1;
+		return INVALID_PHYS_ADDR;
 	}
 }
 
-static bool large_allowed(enum populate_mode mode)
+static bool large_page_mapping_allowed(enum populate_mode mode)
 {
-	return (mode == POPULATE_DIRECT) || (mode == POPULATE_IDENTITY) || (mode == POPULATE_KERNEL);
+	switch (mode) {
+	case POPULATE_DIRECT:
+	case POPULATE_IDENTITY:
+	case POPULATE_KERNEL:
+#ifdef CONFIG_KASAN
+	case POPULATE_KASAN_MAP_SHADOW:
+#endif
+		return true;
+	default:
+		return false;
+	}
 }
 
-static bool can_large_pud(pud_t *pu_dir, unsigned long addr, unsigned long end,
+static unsigned long try_get_large_pud_pa(pud_t *pu_dir, unsigned long addr, unsigned long end,
 					  enum populate_mode mode)
 {
-	unsigned long size = end - addr;
+	unsigned long pa, size = end - addr;
 
-	return machine.has_edat2 && large_allowed(mode) &&
+	if (!machine.has_edat2 || !large_page_mapping_allowed(mode) ||
-	       IS_ALIGNED(addr, PUD_SIZE) && (size >= PUD_SIZE) &&
+	    !IS_ALIGNED(addr, PUD_SIZE) || (size < PUD_SIZE))
-	       IS_ALIGNED(_pa(addr, size, mode), PUD_SIZE);
+		return INVALID_PHYS_ADDR;
+
+	pa = resolve_pa_may_alloc(addr, size, mode);
+	if (!IS_ALIGNED(pa, PUD_SIZE))
+		return INVALID_PHYS_ADDR;
+
+	return pa;
 }
 
-static bool can_large_pmd(pmd_t *pm_dir, unsigned long addr, unsigned long end,
+static unsigned long try_get_large_pmd_pa(pmd_t *pm_dir, unsigned long addr, unsigned long end,
 					  enum populate_mode mode)
 {
-	unsigned long size = end - addr;
+	unsigned long pa, size = end - addr;
 
-	return machine.has_edat1 && large_allowed(mode) &&
+	if (!machine.has_edat1 || !large_page_mapping_allowed(mode) ||
-	       IS_ALIGNED(addr, PMD_SIZE) && (size >= PMD_SIZE) &&
+	    !IS_ALIGNED(addr, PMD_SIZE) || (size < PMD_SIZE))
-	       IS_ALIGNED(_pa(addr, size, mode), PMD_SIZE);
+		return INVALID_PHYS_ADDR;
+
+	pa = resolve_pa_may_alloc(addr, size, mode);
+	if (!IS_ALIGNED(pa, PMD_SIZE))
+		return INVALID_PHYS_ADDR;
+
+	return pa;
 }
 
 static void pgtable_pte_populate(pmd_t *pmd, unsigned long addr, unsigned long end,
@@ -290,7 +352,7 @@ static void pgtable_pte_populate(pmd_t *pmd, unsigned long addr, unsigned long e
 		if (pte_none(*pte)) {
 			if (kasan_pte_populate_zero_shadow(pte, mode))
 				continue;
-			entry = __pte(_pa(addr, PAGE_SIZE, mode));
+			entry = __pte(resolve_pa_may_alloc(addr, PAGE_SIZE, mode));
 			entry = set_pte_bit(entry, PAGE_KERNEL);
 			set_pte(pte, entry);
 			pages++;
@@ -303,7 +365,7 @@ static void pgtable_pte_populate(pmd_t *pmd, unsigned long addr, unsigned long e
 static void pgtable_pmd_populate(pud_t *pud, unsigned long addr, unsigned long end,
 				 enum populate_mode mode)
 {
-	unsigned long next, pages = 0;
+	unsigned long pa, next, pages = 0;
 	pmd_t *pmd, entry;
 	pte_t *pte;
 
@@ -313,8 +375,9 @@ static void pgtable_pmd_populate(pud_t *pud, unsigned long addr, unsigned long e
 		if (pmd_none(*pmd)) {
 			if (kasan_pmd_populate_zero_shadow(pmd, addr, next, mode))
 				continue;
-			if (can_large_pmd(pmd, addr, next, mode)) {
+			pa = try_get_large_pmd_pa(pmd, addr, next, mode);
-				entry = __pmd(_pa(addr, _SEGMENT_SIZE, mode));
+			if (pa != INVALID_PHYS_ADDR) {
+				entry = __pmd(pa);
 				entry = set_pmd_bit(entry, SEGMENT_KERNEL);
 				set_pmd(pmd, entry);
 				pages++;
@@ -334,7 +397,7 @@ static void pgtable_pmd_populate(pud_t *pud, unsigned long addr, unsigned long e
 static void pgtable_pud_populate(p4d_t *p4d, unsigned long addr, unsigned long end,
 				 enum populate_mode mode)
 {
-	unsigned long next, pages = 0;
+	unsigned long pa, next, pages = 0;
 	pud_t *pud, entry;
 	pmd_t *pmd;
 
@@ -344,8 +407,9 @@ static void pgtable_pud_populate(p4d_t *p4d, unsigned long addr, unsigned long e
 		if (pud_none(*pud)) {
 			if (kasan_pud_populate_zero_shadow(pud, addr, next, mode))
 				continue;
-			if (can_large_pud(pud, addr, next, mode)) {
+			pa = try_get_large_pud_pa(pud, addr, next, mode);
-				entry = __pud(_pa(addr, _REGION3_SIZE, mode));
+			if (pa != INVALID_PHYS_ADDR) {
+				entry = __pud(pa);
 				entry = set_pud_bit(entry, REGION3_KERNEL);
 				set_pud(pud, entry);
 				pages++;
@@ -388,6 +452,13 @@ static void pgtable_populate(unsigned long addr, unsigned long end, enum populat
 	pgd_t *pgd;
 	p4d_t *p4d;
 
+	if (!is_kasan_populate_mode(mode)) {
+		boot_debug("%-17s 0x%016lx-0x%016lx -> 0x%016lx-0x%016lx\n",
+			   get_populate_mode_name(mode), addr, end,
+			   resolve_pa_may_alloc(addr, 0, mode),
+			   resolve_pa_may_alloc(end - 1, 0, mode) + 1);
+	}
+
 	pgd = pgd_offset(&init_mm, addr);
 	for (; addr < end; addr = next, pgd++) {
 		next = pgd_addr_end(addr, end);

arch/s390/include/asm/asm-extable.h

@@ -9,11 +9,11 @@
 #define EX_TYPE_NONE		0
 #define EX_TYPE_FIXUP		1
 #define EX_TYPE_BPF		2
-#define EX_TYPE_UA_STORE	3
+#define EX_TYPE_UA_FAULT	3
-#define EX_TYPE_UA_LOAD_MEM	4
 #define EX_TYPE_UA_LOAD_REG	5
 #define EX_TYPE_UA_LOAD_REGPAIR	6
 #define EX_TYPE_ZEROPAD		7
+#define EX_TYPE_FPC		8
 
 #define EX_DATA_REG_ERR_SHIFT	0
 #define EX_DATA_REG_ERR		GENMASK(3, 0)
@@ -69,11 +69,8 @@
 #define EX_TABLE_AMODE31(_fault, _target)				\
 	__EX_TABLE(.amode31.ex_table, _fault, _target, EX_TYPE_FIXUP, __stringify(%%r0), __stringify(%%r0), 0)
 
-#define EX_TABLE_UA_STORE(_fault, _target, _regerr)			\
+#define EX_TABLE_UA_FAULT(_fault, _target, _regerr)			\
-	__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_UA_STORE, _regerr, _regerr, 0)
+	__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_UA_FAULT, _regerr, _regerr, 0)
-
-#define EX_TABLE_UA_LOAD_MEM(_fault, _target, _regerr, _regmem, _len)	\
-	__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_MEM, _regerr, _regmem, _len)
 
 #define EX_TABLE_UA_LOAD_REG(_fault, _target, _regerr, _regzero)	\
 	__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_REG, _regerr, _regzero, 0)
@@ -84,4 +81,7 @@
 #define EX_TABLE_ZEROPAD(_fault, _target, _regdata, _regaddr)		\
 	__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_ZEROPAD, _regdata, _regaddr, 0)
 
+#define EX_TABLE_FPC(_fault, _target)					\
+	__EX_TABLE(__ex_table, _fault, _target, EX_TYPE_FPC, __stringify(%%r0), __stringify(%%r0), 0)
+
 #endif /* __ASM_EXTABLE_H */

arch/s390/include/asm/asm.h

@@ -28,7 +28,7 @@
  * [var] also contains the program mask. CC_TRANSFORM() moves the condition
  * code to the two least significant bits and sets all other bits to zero.
  */
-#if defined(__GCC_ASM_FLAG_OUTPUTS__) && !(IS_ENABLED(CONFIG_GCC_ASM_FLAG_OUTPUT_BROKEN))
+#if defined(__GCC_ASM_FLAG_OUTPUTS__) && !(IS_ENABLED(CONFIG_CC_ASM_FLAG_OUTPUT_BROKEN))
 
 #define __HAVE_ASM_FLAG_OUTPUTS__
 

arch/s390/include/asm/bitops.h

@@ -60,7 +60,7 @@ static __always_inline bool arch_test_bit(unsigned long nr, const volatile unsig
 		asm volatile(
 			"	tm	%[addr],%[mask]\n"
 			: "=@cc" (cc)
-			: [addr] "R" (*addr), [mask] "I" (mask)
+			: [addr] "Q" (*addr), [mask] "I" (mask)
 			);
 		return cc == 3;
 	}

arch/s390/include/asm/boot_data.h

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _ASM_S390_BOOT_DATA_H
 
+#include <linux/string.h>
 #include <asm/setup.h>
 #include <asm/ipl.h>
 
@@ -15,4 +16,54 @@ extern unsigned long ipl_cert_list_size;
 extern unsigned long early_ipl_comp_list_addr;
 extern unsigned long early_ipl_comp_list_size;
 
+extern char boot_rb[PAGE_SIZE * 2];
+extern bool boot_earlyprintk;
+extern size_t boot_rb_off;
+extern char bootdebug_filter[128];
+extern bool bootdebug;
+
+#define boot_rb_foreach(cb)							\
+	do {									\
+		size_t off = boot_rb_off + strlen(boot_rb + boot_rb_off) + 1;	\
+		size_t len;							\
+		for (; off < sizeof(boot_rb) && (len = strlen(boot_rb + off)); off += len + 1) \
+			cb(boot_rb + off);					\
+		for (off = 0; off < boot_rb_off && (len = strlen(boot_rb + off)); off += len + 1) \
+			cb(boot_rb + off);					\
+	} while (0)
+
+/*
+ * bootdebug_filter is a comma separated list of strings,
+ * where each string can be a prefix of the message.
+ */
+static inline bool bootdebug_filter_match(const char *buf)
+{
+	char *p = bootdebug_filter, *s;
+	char *end;
+
+	if (!*p)
+		return true;
+
+	end = p + strlen(p);
+	while (p < end) {
+		p = skip_spaces(p);
+		s = memscan(p, ',', end - p);
+		if (!strncmp(p, buf, s - p))
+			return true;
+		p = s + 1;
+	}
+	return false;
+}
+
+static inline const char *skip_timestamp(const char *buf)
+{
+#ifdef CONFIG_PRINTK_TIME
+	const char *p = memchr(buf, ']', strlen(buf));
+
+	if (p && p[1] == ' ')
+		return p + 2;
+#endif
+	return buf;
+}
+
 #endif /* _ASM_S390_BOOT_DATA_H */

arch/s390/include/asm/fpu-insn.h

@@ -100,19 +100,12 @@ static __always_inline void fpu_lfpc(unsigned int *fpc)
  */
 static inline void fpu_lfpc_safe(unsigned int *fpc)
 {
-	u32 tmp;
-
 	instrument_read(fpc, sizeof(*fpc));
 	asm_inline volatile(
-		"0:	lfpc	%[fpc]\n"
+		"	lfpc	%[fpc]\n"
-		"1:	nopr	%%r7\n"
+		"0:	nopr	%%r7\n"
-		".pushsection .fixup, \"ax\"\n"
+		EX_TABLE_FPC(0b, 0b)
-		"2:	lghi	%[tmp],0\n"
+		:
-		"	sfpc	%[tmp]\n"
-		"	jg	1b\n"
-		".popsection\n"
-		EX_TABLE(1b, 2b)
-		: [tmp] "=d" (tmp)
 		: [fpc] "Q" (*fpc)
 		: "memory");
 }
@@ -183,7 +176,19 @@ static __always_inline void fpu_vgfmg(u8 v1, u8 v2, u8 v3)
 		     : "memory");
 }
 
-#ifdef CONFIG_CC_IS_CLANG
+#ifdef CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS
+
+static __always_inline void fpu_vl(u8 v1, const void *vxr)
+{
+	instrument_read(vxr, sizeof(__vector128));
+	asm volatile("VL	%[v1],%O[vxr],,%R[vxr]\n"
+		     :
+		     : [vxr] "Q" (*(__vector128 *)vxr),
+		       [v1] "I" (v1)
+		     : "memory");
+}
+
+#else /* CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS */
 
 static __always_inline void fpu_vl(u8 v1, const void *vxr)
 {
@@ -197,19 +202,7 @@ static __always_inline void fpu_vl(u8 v1, const void *vxr)
 		: "memory", "1");
 }
 
-#else /* CONFIG_CC_IS_CLANG */
+#endif /* CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS */
-
-static __always_inline void fpu_vl(u8 v1, const void *vxr)
-{
-	instrument_read(vxr, sizeof(__vector128));
-	asm volatile("VL	%[v1],%O[vxr],,%R[vxr]\n"
-		     :
-		     : [vxr] "Q" (*(__vector128 *)vxr),
-		       [v1] "I" (v1)
-		     : "memory");
-}
-
-#endif /* CONFIG_CC_IS_CLANG */
 
 static __always_inline void fpu_vleib(u8 v, s16 val, u8 index)
 {
@@ -238,7 +231,23 @@ static __always_inline u64 fpu_vlgvf(u8 v, u16 index)
 	return val;
 }
 
-#ifdef CONFIG_CC_IS_CLANG
+#ifdef CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS
+
+static __always_inline void fpu_vll(u8 v1, u32 index, const void *vxr)
+{
+	unsigned int size;
+
+	size = min(index + 1, sizeof(__vector128));
+	instrument_read(vxr, size);
+	asm volatile("VLL	%[v1],%[index],%O[vxr],%R[vxr]\n"
+		     :
+		     : [vxr] "Q" (*(u8 *)vxr),
+		       [index] "d" (index),
+		       [v1] "I" (v1)
+		     : "memory");
+}
+
+#else /* CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS */
 
 static __always_inline void fpu_vll(u8 v1, u32 index, const void *vxr)
 {
@@ -256,25 +265,27 @@ static __always_inline void fpu_vll(u8 v1, u32 index, const void *vxr)
 		: "memory", "1");
 }
 
-#else /* CONFIG_CC_IS_CLANG */
+#endif /* CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS */
 
-static __always_inline void fpu_vll(u8 v1, u32 index, const void *vxr)
+#ifdef CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS
-{
-	unsigned int size;
 
-	size = min(index + 1, sizeof(__vector128));
+#define fpu_vlm(_v1, _v3, _vxrs)					\
-	instrument_read(vxr, size);
+({									\
-	asm volatile("VLL	%[v1],%[index],%O[vxr],%R[vxr]\n"
+	unsigned int size = ((_v3) - (_v1) + 1) * sizeof(__vector128);	\
-		     :
+	struct {							\
-		     : [vxr] "Q" (*(u8 *)vxr),
+		__vector128 _v[(_v3) - (_v1) + 1];			\
-		       [index] "d" (index),
+	} *_v = (void *)(_vxrs);					\
-		       [v1] "I" (v1)
+									\
-		     : "memory");
+	instrument_read(_v, size);					\
-}
+	asm volatile("VLM	%[v1],%[v3],%O[vxrs],%R[vxrs]\n"	\
+		     :							\
+		     : [vxrs] "Q" (*_v),				\
+		       [v1] "I" (_v1), [v3] "I" (_v3)			\
+		     : "memory");					\
+	(_v3) - (_v1) + 1;						\
+})
 
-#endif /* CONFIG_CC_IS_CLANG */
+#else /* CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS */
-
-#ifdef CONFIG_CC_IS_CLANG
 
 #define fpu_vlm(_v1, _v3, _vxrs)					\
 ({									\
@@ -294,25 +305,7 @@ static __always_inline void fpu_vll(u8 v1, u32 index, const void *vxr)
 	(_v3) - (_v1) + 1;						\
 })
 
-#else /* CONFIG_CC_IS_CLANG */
+#endif /* CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS */
-
-#define fpu_vlm(_v1, _v3, _vxrs)					\
-({									\
-	unsigned int size = ((_v3) - (_v1) + 1) * sizeof(__vector128);	\
-	struct {							\
-		__vector128 _v[(_v3) - (_v1) + 1];			\
-	} *_v = (void *)(_vxrs);					\
-									\
-	instrument_read(_v, size);					\
-	asm volatile("VLM	%[v1],%[v3],%O[vxrs],%R[vxrs]\n"	\
-		     :							\
-		     : [vxrs] "Q" (*_v),				\
-		       [v1] "I" (_v1), [v3] "I" (_v3)			\
-		     : "memory");					\
-	(_v3) - (_v1) + 1;						\
-})
-
-#endif /* CONFIG_CC_IS_CLANG */
 
 static __always_inline void fpu_vlr(u8 v1, u8 v2)
 {
@@ -362,7 +355,18 @@ static __always_inline void fpu_vsrlb(u8 v1, u8 v2, u8 v3)
 		     : "memory");
 }
 
-#ifdef CONFIG_CC_IS_CLANG
+#ifdef CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS
+
+static __always_inline void fpu_vst(u8 v1, const void *vxr)
+{
+	instrument_write(vxr, sizeof(__vector128));
+	asm volatile("VST	%[v1],%O[vxr],,%R[vxr]\n"
+		     : [vxr] "=Q" (*(__vector128 *)vxr)
+		     : [v1] "I" (v1)
+		     : "memory");
+}
+
+#else /* CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS */
 
 static __always_inline void fpu_vst(u8 v1, const void *vxr)
 {
@@ -375,20 +379,23 @@ static __always_inline void fpu_vst(u8 v1, const void *vxr)
 		: "memory", "1");
 }
 
-#else /* CONFIG_CC_IS_CLANG */
+#endif /* CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS */
 
-static __always_inline void fpu_vst(u8 v1, const void *vxr)
+#ifdef CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS
+
+static __always_inline void fpu_vstl(u8 v1, u32 index, const void *vxr)
 {
-	instrument_write(vxr, sizeof(__vector128));
+	unsigned int size;
-	asm volatile("VST	%[v1],%O[vxr],,%R[vxr]\n"
+
-		     : [vxr] "=Q" (*(__vector128 *)vxr)
+	size = min(index + 1, sizeof(__vector128));
-		     : [v1] "I" (v1)
+	instrument_write(vxr, size);
+	asm volatile("VSTL	%[v1],%[index],%O[vxr],%R[vxr]\n"
+		     : [vxr] "=Q" (*(u8 *)vxr)
+		     : [index] "d" (index), [v1] "I" (v1)
 		     : "memory");
 }
 
-#endif /* CONFIG_CC_IS_CLANG */
+#else /* CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS */
-
-#ifdef CONFIG_CC_IS_CLANG
 
 static __always_inline void fpu_vstl(u8 v1, u32 index, const void *vxr)
 {
@@ -404,23 +411,26 @@ static __always_inline void fpu_vstl(u8 v1, u32 index, const void *vxr)
 		: "memory", "1");
 }
 
-#else /* CONFIG_CC_IS_CLANG */
+#endif /* CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS */
 
-static __always_inline void fpu_vstl(u8 v1, u32 index, const void *vxr)
+#ifdef CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS
-{
-	unsigned int size;
 
-	size = min(index + 1, sizeof(__vector128));
+#define fpu_vstm(_v1, _v3, _vxrs)					\
-	instrument_write(vxr, size);
+({									\
-	asm volatile("VSTL	%[v1],%[index],%O[vxr],%R[vxr]\n"
+	unsigned int size = ((_v3) - (_v1) + 1) * sizeof(__vector128);	\
-		     : [vxr] "=Q" (*(u8 *)vxr)
+	struct {							\
-		     : [index] "d" (index), [v1] "I" (v1)
+		__vector128 _v[(_v3) - (_v1) + 1];			\
-		     : "memory");
+	} *_v = (void *)(_vxrs);					\
-}
+									\
+	instrument_write(_v, size);					\
+	asm volatile("VSTM	%[v1],%[v3],%O[vxrs],%R[vxrs]\n"	\
+		     : [vxrs] "=Q" (*_v)				\
+		     : [v1] "I" (_v1), [v3] "I" (_v3)			\
+		     : "memory");					\
+	(_v3) - (_v1) + 1;						\
+})
 
-#endif /* CONFIG_CC_IS_CLANG */
+#else /* CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS */
-
-#ifdef CONFIG_CC_IS_CLANG
 
 #define fpu_vstm(_v1, _v3, _vxrs)					\
 ({									\
@@ -439,24 +449,7 @@ static __always_inline void fpu_vstl(u8 v1, u32 index, const void *vxr)
 	(_v3) - (_v1) + 1;						\
 })
 
-#else /* CONFIG_CC_IS_CLANG */
+#endif /* CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS */
-
-#define fpu_vstm(_v1, _v3, _vxrs)					\
-({									\
-	unsigned int size = ((_v3) - (_v1) + 1) * sizeof(__vector128);	\
-	struct {							\
-		__vector128 _v[(_v3) - (_v1) + 1];			\
-	} *_v = (void *)(_vxrs);					\
-									\
-	instrument_write(_v, size);					\
-	asm volatile("VSTM	%[v1],%[v3],%O[vxrs],%R[vxrs]\n"	\
-		     : [vxrs] "=Q" (*_v)				\
-		     : [v1] "I" (_v1), [v3] "I" (_v3)			\
-		     : "memory");					\
-	(_v3) - (_v1) + 1;						\
-})
-
-#endif /* CONFIG_CC_IS_CLANG */
 
 static __always_inline void fpu_vupllf(u8 v1, u8 v2)
 {

arch/s390/include/asm/futex.h

@@ -2,80 +2,95 @@
 #ifndef _ASM_S390_FUTEX_H
 #define _ASM_S390_FUTEX_H
 
+#include <linux/instrumented.h>
 #include <linux/uaccess.h>
 #include <linux/futex.h>
 #include <asm/asm-extable.h>
 #include <asm/mmu_context.h>
 #include <asm/errno.h>
 
-#define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg)	\
+#define FUTEX_OP_FUNC(name, insn)						\
-	asm volatile(							\
+static uaccess_kmsan_or_inline int						\
+__futex_atomic_##name(int oparg, int *old, u32 __user *uaddr)			\
+{										\
+	int rc, new;								\
+										\
+	instrument_copy_from_user_before(old, uaddr, sizeof(*old));		\
+	asm_inline volatile(							\
 		"	sacf	256\n"						\
-		"0: l     %1,0(%6)\n"					\
+		"0:	l	%[old],%[uaddr]\n"				\
 		"1:"insn							\
-		"2: cs    %1,%2,0(%6)\n"				\
+		"2:	cs	%[old],%[new],%[uaddr]\n"			\
 		"3:	jl	1b\n"						\
-		"   lhi   %0,0\n"					\
+		"	lhi	%[rc],0\n"					\
 		"4:	sacf	768\n"						\
-		EX_TABLE(0b,4b) EX_TABLE(1b,4b)				\
+		EX_TABLE_UA_FAULT(0b, 4b, %[rc])				\
-		EX_TABLE(2b,4b) EX_TABLE(3b,4b)				\
+		EX_TABLE_UA_FAULT(1b, 4b, %[rc])				\
-		: "=d" (ret), "=&d" (oldval), "=&d" (newval),		\
+		EX_TABLE_UA_FAULT(2b, 4b, %[rc])				\
-		  "=m" (*uaddr)						\
+		EX_TABLE_UA_FAULT(3b, 4b, %[rc])				\
-		: "0" (-EFAULT), "d" (oparg), "a" (uaddr),		\
+		: [rc] "=d" (rc), [old] "=&d" (*old),				\
-		  "m" (*uaddr) : "cc");
+		  [new] "=&d" (new), [uaddr] "+Q" (*uaddr)			\
+		: [oparg] "d" (oparg)						\
+		: "cc");							\
+	if (!rc)								\
+		instrument_copy_from_user_after(old, uaddr, sizeof(*old), 0);	\
+	return rc;								\
+}
 
-static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
+FUTEX_OP_FUNC(set, "lr %[new],%[oparg]\n")
-		u32 __user *uaddr)
+FUTEX_OP_FUNC(add, "lr %[new],%[old]\n ar %[new],%[oparg]\n")
+FUTEX_OP_FUNC(or,  "lr %[new],%[old]\n or %[new],%[oparg]\n")
+FUTEX_OP_FUNC(and, "lr %[new],%[old]\n nr %[new],%[oparg]\n")
+FUTEX_OP_FUNC(xor, "lr %[new],%[old]\n xr %[new],%[oparg]\n")
+
+static inline
+int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
 {
-	int oldval = 0, newval, ret;
+	int old, rc;
 
 	switch (op) {
 	case FUTEX_OP_SET:
-		__futex_atomic_op("lr %2,%5\n",
+		rc = __futex_atomic_set(oparg, &old, uaddr);
-				  ret, oldval, newval, uaddr, oparg);
 		break;
 	case FUTEX_OP_ADD:
-		__futex_atomic_op("lr %2,%1\nar %2,%5\n",
+		rc = __futex_atomic_add(oparg, &old, uaddr);
-				  ret, oldval, newval, uaddr, oparg);
 		break;
 	case FUTEX_OP_OR:
-		__futex_atomic_op("lr %2,%1\nor %2,%5\n",
+		rc = __futex_atomic_or(oparg, &old, uaddr);
-				  ret, oldval, newval, uaddr, oparg);
 		break;
 	case FUTEX_OP_ANDN:
-		__futex_atomic_op("lr %2,%1\nnr %2,%5\n",
+		rc = __futex_atomic_and(~oparg, &old, uaddr);
-				  ret, oldval, newval, uaddr, ~oparg);
 		break;
 	case FUTEX_OP_XOR:
-		__futex_atomic_op("lr %2,%1\nxr %2,%5\n",
+		rc = __futex_atomic_xor(oparg, &old, uaddr);
-				  ret, oldval, newval, uaddr, oparg);
 		break;
 	default:
-		ret = -ENOSYS;
+		rc = -ENOSYS;
+	}
+	if (!rc)
+		*oval = old;
+	return rc;
 }
 
-	if (!ret)
+static uaccess_kmsan_or_inline
-		*oval = oldval;
+int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, u32 newval)
-
-	return ret;
-}
-
-static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
-						u32 oldval, u32 newval)
 {
-	int ret;
+	int rc;
 
-	asm volatile(
+	instrument_copy_from_user_before(uval, uaddr, sizeof(*uval));
+	asm_inline volatile(
 		"	sacf	256\n"
-		"0: cs   %1,%4,0(%5)\n"
+		"0:	cs	%[old],%[new],%[uaddr]\n"
-		"1: la   %0,0\n"
+		"1:	lhi	%[rc],0\n"
 		"2:	sacf	768\n"
-		EX_TABLE(0b,2b) EX_TABLE(1b,2b)
+		EX_TABLE_UA_FAULT(0b, 2b, %[rc])
-		: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
+		EX_TABLE_UA_FAULT(1b, 2b, %[rc])
-		: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
+		: [rc] "=d" (rc), [old] "+d" (oldval), [uaddr] "+Q" (*uaddr)
+		: [new] "d" (newval)
 		: "cc", "memory");
 	*uval = oldval;
-	return ret;
+	instrument_copy_from_user_after(uval, uaddr, sizeof(*uval), 0);
+	return rc;
 }
 
 #endif /* _ASM_S390_FUTEX_H */

arch/s390/include/asm/page.h

@@ -184,7 +184,11 @@ extern struct vm_layout vm_layout;
 
 #define __kaslr_offset		vm_layout.kaslr_offset
 #define __kaslr_offset_phys	vm_layout.kaslr_offset_phys
+#ifdef CONFIG_RANDOMIZE_IDENTITY_BASE
 #define __identity_base		vm_layout.identity_base
+#else
+#define __identity_base		0UL
+#endif
 #define ident_map_size		vm_layout.identity_size
 
 static inline unsigned long kaslr_offset(void)

arch/s390/include/asm/physmem_info.h

@@ -26,7 +26,7 @@ enum reserved_range_type {
 	RR_AMODE31,
 	RR_IPLREPORT,
 	RR_CERT_COMP_LIST,
-	RR_MEM_DETECT_EXTENDED,
+	RR_MEM_DETECT_EXT,
 	RR_VMEM,
 	RR_MAX
 };
@@ -128,7 +128,7 @@ static inline const char *get_rr_type_name(enum reserved_range_type t)
 	RR_TYPE_NAME(AMODE31);
 	RR_TYPE_NAME(IPLREPORT);
 	RR_TYPE_NAME(CERT_COMP_LIST);
-	RR_TYPE_NAME(MEM_DETECT_EXTENDED);
+	RR_TYPE_NAME(MEM_DETECT_EXT);
 	RR_TYPE_NAME(VMEM);
 	default:
 		return "UNKNOWN";

arch/s390/include/asm/sclp.h

@@ -172,6 +172,7 @@ void sclp_early_printk(const char *s);
 void __sclp_early_printk(const char *s, unsigned int len);
 void sclp_emergency_printk(const char *s);
 
+int sclp_init(void);
 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);

arch/s390/include/asm/uaccess.h

@@ -22,16 +22,117 @@
 
 void debug_user_asce(int exit);
 
-unsigned long __must_check
+union oac {
-raw_copy_from_user(void *to, const void __user *from, unsigned long n);
+	unsigned int val;
+	struct {
+		struct {
+			unsigned short key : 4;
+			unsigned short	   : 4;
+			unsigned short as  : 2;
+			unsigned short	   : 4;
+			unsigned short k   : 1;
+			unsigned short a   : 1;
+		} oac1;
+		struct {
+			unsigned short key : 4;
+			unsigned short	   : 4;
+			unsigned short as  : 2;
+			unsigned short	   : 4;
+			unsigned short k   : 1;
+			unsigned short a   : 1;
+		} oac2;
+	};
+};
 
-unsigned long __must_check
+static __always_inline __must_check unsigned long
-raw_copy_to_user(void __user *to, const void *from, unsigned long n);
+raw_copy_from_user_key(void *to, const void __user *from, unsigned long size, unsigned long key)
+{
+	unsigned long rem;
+	union oac spec = {
+		.oac2.key = key,
+		.oac2.as = PSW_BITS_AS_SECONDARY,
+		.oac2.k = 1,
+		.oac2.a = 1,
+	};
 
-#ifndef CONFIG_KASAN
+	asm_inline volatile(
-#define INLINE_COPY_FROM_USER
+		"	lr	%%r0,%[spec]\n"
-#define INLINE_COPY_TO_USER
+		"0:	mvcos	0(%[to]),0(%[from]),%[size]\n"
-#endif
+		"1:	jz	5f\n"
+		"	algr	%[size],%[val]\n"
+		"	slgr	%[from],%[val]\n"
+		"	slgr	%[to],%[val]\n"
+		"	j	0b\n"
+		"2:	la	%[rem],4095(%[from])\n" /* rem = from + 4095 */
+		"	nr	%[rem],%[val]\n"	/* rem = (from + 4095) & -4096 */
+		"	slgr	%[rem],%[from]\n"
+		"	clgr	%[size],%[rem]\n"	/* copy crosses next page boundary? */
+		"	jnh	6f\n"
+		"3:	mvcos	0(%[to]),0(%[from]),%[rem]\n"
+		"4:	slgr	%[size],%[rem]\n"
+		"	j	6f\n"
+		"5:	lghi	%[size],0\n"
+		"6:\n"
+		EX_TABLE(0b, 2b)
+		EX_TABLE(1b, 2b)
+		EX_TABLE(3b, 6b)
+		EX_TABLE(4b, 6b)
+		: [size] "+&a" (size), [from] "+&a" (from), [to] "+&a" (to), [rem] "=&a" (rem)
+		: [val] "a" (-4096UL), [spec] "d" (spec.val)
+		: "cc", "memory", "0");
+	return size;
+}
+
+static __always_inline __must_check unsigned long
+raw_copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+	return raw_copy_from_user_key(to, from, n, 0);
+}
+
+static __always_inline __must_check unsigned long
+raw_copy_to_user_key(void __user *to, const void *from, unsigned long size, unsigned long key)
+{
+	unsigned long rem;
+	union oac spec = {
+		.oac1.key = key,
+		.oac1.as = PSW_BITS_AS_SECONDARY,
+		.oac1.k = 1,
+		.oac1.a = 1,
+	};
+
+	asm_inline volatile(
+		"	lr	%%r0,%[spec]\n"
+		"0:	mvcos	0(%[to]),0(%[from]),%[size]\n"
+		"1:	jz	5f\n"
+		"	algr	%[size],%[val]\n"
+		"	slgr	%[to],%[val]\n"
+		"	slgr	%[from],%[val]\n"
+		"	j	0b\n"
+		"2:	la	%[rem],4095(%[to])\n"	/* rem = to + 4095 */
+		"	nr	%[rem],%[val]\n"	/* rem = (to + 4095) & -4096 */
+		"	slgr	%[rem],%[to]\n"
+		"	clgr	%[size],%[rem]\n"	/* copy crosses next page boundary? */
+		"	jnh	6f\n"
+		"3:	mvcos	0(%[to]),0(%[from]),%[rem]\n"
+		"4:	slgr	%[size],%[rem]\n"
+		"	j	6f\n"
+		"5:	lghi	%[size],0\n"
+		"6:\n"
+		EX_TABLE(0b, 2b)
+		EX_TABLE(1b, 2b)
+		EX_TABLE(3b, 6b)
+		EX_TABLE(4b, 6b)
+		: [size] "+&a" (size), [to] "+&a" (to), [from] "+&a" (from), [rem] "=&a" (rem)
+		: [val] "a" (-4096UL), [spec] "d" (spec.val)
+		: "cc", "memory", "0");
+	return size;
+}
+
+static __always_inline __must_check unsigned long
+raw_copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+	return raw_copy_to_user_key(to, from, n, 0);
+}
 
 unsigned long __must_check
 _copy_from_user_key(void *to, const void __user *from, unsigned long n, unsigned long key);
@@ -55,63 +156,71 @@ copy_to_user_key(void __user *to, const void *from, unsigned long n, unsigned lo
 	return n;
 }
 
-union oac {
-	unsigned int val;
-	struct {
-		struct {
-			unsigned short key : 4;
-			unsigned short	   : 4;
-			unsigned short as  : 2;
-			unsigned short	   : 4;
-			unsigned short k   : 1;
-			unsigned short a   : 1;
-		} oac1;
-		struct {
-			unsigned short key : 4;
-			unsigned short	   : 4;
-			unsigned short as  : 2;
-			unsigned short	   : 4;
-			unsigned short k   : 1;
-			unsigned short a   : 1;
-		} oac2;
-	};
-};
-
 int __noreturn __put_user_bad(void);
 
 #ifdef CONFIG_KMSAN
-#define get_put_user_noinstr_attributes \
+#define uaccess_kmsan_or_inline noinline __maybe_unused __no_sanitize_memory
-	noinline __maybe_unused __no_sanitize_memory
 #else
-#define get_put_user_noinstr_attributes __always_inline
+#define uaccess_kmsan_or_inline __always_inline
 #endif
 
-#define DEFINE_PUT_USER(type)						\
+#ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
-static get_put_user_noinstr_attributes int				\
+
+#define DEFINE_PUT_USER_NOINSTR(type)					\
+static uaccess_kmsan_or_inline int					\
+__put_user_##type##_noinstr(unsigned type __user *to,			\
+			    unsigned type *from,			\
+			    unsigned long size)				\
+{									\
+	asm goto(							\
+		"	llilh	%%r0,%[spec]\n"				\
+		"0:	mvcos	%[to],%[from],%[size]\n"		\
+		"1:	nopr	%%r7\n"					\
+		EX_TABLE(0b, %l[Efault])				\
+		EX_TABLE(1b, %l[Efault])				\
+		: [to] "+Q" (*to)					\
+		: [size] "d" (size), [from] "Q" (*from),		\
+		  [spec] "I" (0x81)					\
+		: "cc", "0"						\
+		: Efault						\
+		);							\
+	return 0;							\
+Efault:									\
+	return -EFAULT;							\
+}
+
+#else /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
+
+#define DEFINE_PUT_USER_NOINSTR(type)					\
+static uaccess_kmsan_or_inline int					\
 __put_user_##type##_noinstr(unsigned type __user *to,			\
 			    unsigned type *from,			\
 			    unsigned long size)				\
 {									\
-	union oac __oac_spec = {					\
-		.oac1.as = PSW_BITS_AS_SECONDARY,			\
-		.oac1.a = 1,						\
-	};								\
 	int rc;								\
 									\
 	asm volatile(							\
-		"	lr	0,%[spec]\n"				\
+		"	llilh	%%r0,%[spec]\n"				\
-		"0:	mvcos	%[_to],%[_from],%[_size]\n"		\
+		"0:	mvcos	%[to],%[from],%[size]\n"		\
-		"1:	xr	%[rc],%[rc]\n"				\
+		"1:	lhi	%[rc],0\n"				\
 		"2:\n"							\
-		EX_TABLE_UA_STORE(0b, 2b, %[rc])			\
+		EX_TABLE_UA_FAULT(0b, 2b, %[rc])			\
-		EX_TABLE_UA_STORE(1b, 2b, %[rc])			\
+		EX_TABLE_UA_FAULT(1b, 2b, %[rc])			\
-		: [rc] "=&d" (rc), [_to] "+Q" (*(to))			\
+		: [rc] "=d" (rc), [to] "+Q" (*to)			\
-		: [_size] "d" (size), [_from] "Q" (*(from)),		\
+		: [size] "d" (size), [from] "Q" (*from),		\
-		  [spec] "d" (__oac_spec.val)				\
+		  [spec] "I" (0x81)					\
 		: "cc", "0");						\
 	return rc;							\
-}									\
+}
-									\
+
+#endif /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
+
+DEFINE_PUT_USER_NOINSTR(char);
+DEFINE_PUT_USER_NOINSTR(short);
+DEFINE_PUT_USER_NOINSTR(int);
+DEFINE_PUT_USER_NOINSTR(long);
+
+#define DEFINE_PUT_USER(type)						\
 static __always_inline int						\
 __put_user_##type(unsigned type __user *to, unsigned type *from,	\
 		  unsigned long size)					\
@@ -128,69 +237,111 @@ DEFINE_PUT_USER(short);
 DEFINE_PUT_USER(int);
 DEFINE_PUT_USER(long);
 
-static __always_inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
+#define __put_user(x, ptr)						\
-{
+({									\
-	int rc;
+	__typeof__(*(ptr)) __x = (x);					\
+	int __prc;							\
+									\
+	__chk_user_ptr(ptr);						\
+	switch (sizeof(*(ptr))) {					\
+	case 1:								\
+		__prc = __put_user_char((unsigned char __user *)(ptr),	\
+					(unsigned char *)&__x,		\
+					sizeof(*(ptr)));		\
+		break;							\
+	case 2:								\
+		__prc = __put_user_short((unsigned short __user *)(ptr),\
+					 (unsigned short *)&__x,	\
+					 sizeof(*(ptr)));		\
+		break;							\
+	case 4:								\
+		__prc = __put_user_int((unsigned int __user *)(ptr),	\
+				       (unsigned int *)&__x,		\
+				       sizeof(*(ptr)));			\
+		break;							\
+	case 8:								\
+		__prc = __put_user_long((unsigned long __user *)(ptr),	\
+					(unsigned long *)&__x,		\
+					sizeof(*(ptr)));		\
+		break;							\
+	default:							\
+		__prc = __put_user_bad();				\
+		break;							\
+	}								\
+	__builtin_expect(__prc, 0);					\
+})
 
-	switch (size) {
+#define put_user(x, ptr)						\
-	case 1:
+({									\
-		rc = __put_user_char((unsigned char __user *)ptr,
+	might_fault();							\
-				     (unsigned char *)x,
+	__put_user(x, ptr);						\
-				     size);
+})
-		break;
-	case 2:
-		rc = __put_user_short((unsigned short __user *)ptr,
-				      (unsigned short *)x,
-				      size);
-		break;
-	case 4:
-		rc = __put_user_int((unsigned int __user *)ptr,
-				    (unsigned int *)x,
-				    size);
-		break;
-	case 8:
-		rc = __put_user_long((unsigned long __user *)ptr,
-				     (unsigned long *)x,
-				     size);
-		break;
-	default:
-		__put_user_bad();
-		break;
-	}
-	return rc;
-}
 
 int __noreturn __get_user_bad(void);
 
-#define DEFINE_GET_USER(type)						\
+#ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
-static get_put_user_noinstr_attributes int				\
+
+#define DEFINE_GET_USER_NOINSTR(type)					\
+static uaccess_kmsan_or_inline int					\
 __get_user_##type##_noinstr(unsigned type *to,				\
-			    unsigned type __user *from,			\
+			    const unsigned type __user *from,		\
+			    unsigned long size)				\
+{									\
+	asm goto(							\
+		"	lhi	%%r0,%[spec]\n"				\
+		"0:	mvcos	%[to],%[from],%[size]\n"		\
+		"1:	nopr	%%r7\n"					\
+		EX_TABLE(0b, %l[Efault])				\
+		EX_TABLE(1b, %l[Efault])				\
+		: [to] "=Q" (*to)					\
+		: [size] "d" (size), [from] "Q" (*from),		\
+		  [spec] "I" (0x81)					\
+		: "cc", "0"						\
+		: Efault						\
+		);							\
+	return 0;							\
+Efault:									\
+	*to = 0;							\
+	return -EFAULT;							\
+}
+
+#else /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
+
+#define DEFINE_GET_USER_NOINSTR(type)					\
+static uaccess_kmsan_or_inline int					\
+__get_user_##type##_noinstr(unsigned type *to,				\
+			    const unsigned type __user *from,		\
 			    unsigned long size)				\
 {									\
-	union oac __oac_spec = {					\
-		.oac2.as = PSW_BITS_AS_SECONDARY,			\
-		.oac2.a = 1,						\
-	};								\
 	int rc;								\
 									\
 	asm volatile(							\
-		"	lr	0,%[spec]\n"				\
+		"	lhi	%%r0,%[spec]\n"				\
-		"0:	mvcos	0(%[_to]),%[_from],%[_size]\n"		\
+		"0:	mvcos	%[to],%[from],%[size]\n"		\
-		"1:	xr	%[rc],%[rc]\n"				\
+		"1:	lhi	%[rc],0\n"				\
 		"2:\n"							\
-		EX_TABLE_UA_LOAD_MEM(0b, 2b, %[rc], %[_to], %[_ksize])	\
+		EX_TABLE_UA_FAULT(0b, 2b, %[rc])			\
-		EX_TABLE_UA_LOAD_MEM(1b, 2b, %[rc], %[_to], %[_ksize])	\
+		EX_TABLE_UA_FAULT(1b, 2b, %[rc])			\
-		: [rc] "=&d" (rc), "=Q" (*(to))				\
+		: [rc] "=d" (rc), [to] "=Q" (*to)			\
-		: [_size] "d" (size), [_from] "Q" (*(from)),		\
+		: [size] "d" (size), [from] "Q" (*from),		\
-		  [spec] "d" (__oac_spec.val), [_to] "a" (to),		\
+		  [spec] "I" (0x81)					\
-		  [_ksize] "K" (size)					\
 		: "cc", "0");						\
+	if (likely(!rc))						\
+		return 0;						\
+	*to = 0;							\
 	return rc;							\
-}									\
+}
-									\
+
+#endif /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
+
+DEFINE_GET_USER_NOINSTR(char);
+DEFINE_GET_USER_NOINSTR(short);
+DEFINE_GET_USER_NOINSTR(int);
+DEFINE_GET_USER_NOINSTR(long);
+
+#define DEFINE_GET_USER(type)						\
 static __always_inline int						\
-__get_user_##type(unsigned type *to, unsigned type __user *from,	\
+__get_user_##type(unsigned type *to, const unsigned type __user *from,	\
 		  unsigned long size)					\
 {									\
 	int rc;								\
@@ -205,107 +356,50 @@ DEFINE_GET_USER(short);
 DEFINE_GET_USER(int);
 DEFINE_GET_USER(long);
 
-static __always_inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
-{
-	int rc;
-
-	switch (size) {
-	case 1:
-		rc = __get_user_char((unsigned char *)x,
-				     (unsigned char __user *)ptr,
-				     size);
-		break;
-	case 2:
-		rc = __get_user_short((unsigned short *)x,
-				      (unsigned short __user *)ptr,
-				      size);
-		break;
-	case 4:
-		rc = __get_user_int((unsigned int *)x,
-				    (unsigned int __user *)ptr,
-				    size);
-		break;
-	case 8:
-		rc = __get_user_long((unsigned long *)x,
-				     (unsigned long __user *)ptr,
-				     size);
-		break;
-	default:
-		__get_user_bad();
-		break;
-	}
-	return rc;
-}
-
-/*
- * These are the main single-value transfer routines.  They automatically
- * use the right size if we just have the right pointer type.
- */
-#define __put_user(x, ptr)						\
-({									\
-	__typeof__(*(ptr)) __x = (x);					\
-	int __pu_err = -EFAULT;						\
-									\
-	__chk_user_ptr(ptr);						\
-	switch (sizeof(*(ptr))) {					\
-	case 1:								\
-	case 2:								\
-	case 4:								\
-	case 8:								\
-		__pu_err = __put_user_fn(&__x, ptr, sizeof(*(ptr)));	\
-		break;							\
-	default:							\
-		__put_user_bad();					\
-		break;							\
-	}								\
-	__builtin_expect(__pu_err, 0);					\
-})
-
-#define put_user(x, ptr)						\
-({									\
-	might_fault();							\
-	__put_user(x, ptr);						\
-})
-
 #define __get_user(x, ptr)						\
 ({									\
-	int __gu_err = -EFAULT;						\
+	const __user void *____guptr = (ptr);				\
+	int __grc;							\
 									\
 	__chk_user_ptr(ptr);						\
 	switch (sizeof(*(ptr))) {					\
 	case 1: {							\
+		const unsigned char __user *__guptr = ____guptr;	\
 		unsigned char __x;					\
 									\
-		__gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr)));	\
+		__grc = __get_user_char(&__x, __guptr, sizeof(*(ptr)));	\
 		(x) = *(__force __typeof__(*(ptr)) *)&__x;		\
 		break;							\
 	};								\
 	case 2: {							\
+		const unsigned short __user *__guptr = ____guptr;	\
 		unsigned short __x;					\
 									\
-		__gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr)));	\
+		__grc = __get_user_short(&__x, __guptr, sizeof(*(ptr)));\
 		(x) = *(__force __typeof__(*(ptr)) *)&__x;		\
 		break;							\
 	};								\
 	case 4: {							\
+		const unsigned int __user *__guptr = ____guptr;		\
 		unsigned int __x;					\
 									\
-		__gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr)));	\
+		__grc = __get_user_int(&__x, __guptr, sizeof(*(ptr)));	\
 		(x) = *(__force __typeof__(*(ptr)) *)&__x;		\
 		break;							\
 	};								\
 	case 8: {							\
+		const unsigned long __user *__guptr = ____guptr;	\
 		unsigned long __x;					\
 									\
-		__gu_err = __get_user_fn(&__x, ptr, sizeof(*(ptr)));	\
+		__grc = __get_user_long(&__x, __guptr, sizeof(*(ptr)));	\
 		(x) = *(__force __typeof__(*(ptr)) *)&__x;		\
 		break;							\
 	};								\
 	default:							\
-		__get_user_bad();					\
+		__grc = __get_user_bad();				\
 		break;							\
 	}								\
-	__builtin_expect(__gu_err, 0);					\
+	__builtin_expect(__grc, 0);					\
 })
 
 #define get_user(x, ptr)						\
@@ -341,109 +435,71 @@ static inline void *s390_kernel_write(void *dst, const void *src, size_t size)
 	return __s390_kernel_write(dst, src, size);
 }
 
-int __noreturn __put_kernel_bad(void);
+void __noreturn __mvc_kernel_nofault_bad(void);
 
-#define __put_kernel_asm(val, to, insn)					\
+#if defined(CONFIG_CC_HAS_ASM_GOTO_OUTPUT) && defined(CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS)
-({									\
-	int __rc;							\
-									\
-	asm volatile(							\
-		"0:   " insn "  %[_val],%[_to]\n"			\
-		"1:	xr	%[rc],%[rc]\n"				\
-		"2:\n"							\
-		EX_TABLE_UA_STORE(0b, 2b, %[rc])			\
-		EX_TABLE_UA_STORE(1b, 2b, %[rc])			\
-		: [rc] "=d" (__rc), [_to] "+Q" (*(to))			\
-		: [_val] "d" (val)					\
-		: "cc");						\
-	__rc;								\
-})
 
-#define __put_kernel_nofault(dst, src, type, err_label)			\
+#define __mvc_kernel_nofault(dst, src, type, err_label)			\
 do {									\
-	unsigned long __x = (unsigned long)(*((type *)(src)));		\
+	switch (sizeof(type)) {						\
-	int __pk_err;							\
+	case 1:								\
+	case 2:								\
+	case 4:								\
+	case 8:								\
+		asm goto(						\
+			"0:	mvc	%O[_dst](%[_len],%R[_dst]),%[_src]\n" \
+			"1:	nopr	%%r7\n"				\
+			EX_TABLE(0b, %l[err_label])			\
+			EX_TABLE(1b, %l[err_label])			\
+			: [_dst] "=Q" (*(type *)dst)			\
+			: [_src] "Q" (*(type *)(src)),			\
+			  [_len] "I" (sizeof(type))			\
+			:						\
+			: err_label);					\
+		break;							\
+	default:							\
+		__mvc_kernel_nofault_bad();				\
+		break;							\
+	}								\
+} while (0)
+
+#else /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT) && CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS */
+
+#define __mvc_kernel_nofault(dst, src, type, err_label)			\
+do {									\
+	type *(__dst) = (type *)(dst);					\
+	int __rc;							\
 									\
 	switch (sizeof(type)) {						\
 	case 1:								\
-		__pk_err = __put_kernel_asm(__x, (type *)(dst), "stc"); \
-		break;							\
 	case 2:								\
-		__pk_err = __put_kernel_asm(__x, (type *)(dst), "sth"); \
-		break;							\
 	case 4:								\
-		__pk_err = __put_kernel_asm(__x, (type *)(dst), "st");	\
-		break;							\
 	case 8:								\
-		__pk_err = __put_kernel_asm(__x, (type *)(dst), "stg"); \
+		asm_inline volatile(					\
-		break;							\
+			"0:	mvc	0(%[_len],%[_dst]),%[_src]\n"	\
-	default:							\
+			"1:	lhi	%[_rc],0\n"			\
-		__pk_err = __put_kernel_bad();				\
-		break;							\
-	}								\
-	if (unlikely(__pk_err))						\
-		goto err_label;						\
-} while (0)
-
-int __noreturn __get_kernel_bad(void);
-
-#define __get_kernel_asm(val, from, insn)				\
-({									\
-	int __rc;							\
-									\
-	asm volatile(							\
-		"0:   " insn "  %[_val],%[_from]\n"			\
-		"1:	xr	%[rc],%[rc]\n"				\
 			"2:\n"						\
-		EX_TABLE_UA_LOAD_REG(0b, 2b, %[rc], %[_val])		\
+			EX_TABLE_UA_FAULT(0b, 2b, %[_rc])		\
-		EX_TABLE_UA_LOAD_REG(1b, 2b, %[rc], %[_val])		\
+			EX_TABLE_UA_FAULT(1b, 2b, %[_rc])		\
-		: [rc] "=d" (__rc), [_val] "=d" (val)			\
+			: [_rc] "=d" (__rc),				\
-		: [_from] "Q" (*(from))					\
+			  "=m" (*__dst)					\
-		: "cc");						\
+			: [_src] "Q" (*(type *)(src)),			\
-	__rc;								\
+			[_dst] "a" (__dst),				\
-})
+			[_len] "I" (sizeof(type)));			\
-
+		if (__rc)						\
-#define __get_kernel_nofault(dst, src, type, err_label)			\
+			goto err_label;					\
-do {									\
-	int __gk_err;							\
-									\
-	switch (sizeof(type)) {						\
-	case 1: {							\
-		unsigned char __x;					\
-									\
-		__gk_err = __get_kernel_asm(__x, (type *)(src), "ic");	\
-		*((type *)(dst)) = (type)__x;				\
 		break;							\
-	};								\
-	case 2: {							\
-		unsigned short __x;					\
-									\
-		__gk_err = __get_kernel_asm(__x, (type *)(src), "lh");	\
-		*((type *)(dst)) = (type)__x;				\
-		break;							\
-	};								\
-	case 4: {							\
-		unsigned int __x;					\
-									\
-		__gk_err = __get_kernel_asm(__x, (type *)(src), "l");	\
-		*((type *)(dst)) = (type)__x;				\
-		break;							\
-	};								\
-	case 8: {							\
-		unsigned long __x;					\
-									\
-		__gk_err = __get_kernel_asm(__x, (type *)(src), "lg");	\
-		*((type *)(dst)) = (type)__x;				\
-		break;							\
-	};								\
 	default:							\
-		__gk_err = __get_kernel_bad();				\
+		__mvc_kernel_nofault_bad();				\
 		break;							\
 	}								\
-	if (unlikely(__gk_err))						\
-		goto err_label;						\
 } while (0)
 
+#endif /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT && CONFIG_CC_HAS_ASM_AOR_FORMAT_FLAGS */
+
+#define __get_kernel_nofault __mvc_kernel_nofault
+#define __put_kernel_nofault __mvc_kernel_nofault
+
 void __cmpxchg_user_key_called_with_bad_pointer(void);
 
 #define CMPXCHG_USER_KEY_MAX_LOOPS 128

arch/s390/kernel/early.c

@@ -50,6 +50,7 @@ decompressor_handled_param(facilities);
 decompressor_handled_param(nokaslr);
 decompressor_handled_param(cmma);
 decompressor_handled_param(relocate_lowcore);
+decompressor_handled_param(bootdebug);
 #if IS_ENABLED(CONFIG_KVM)
 decompressor_handled_param(prot_virt);
 #endif
@@ -58,7 +59,7 @@ static void __init kasan_early_init(void)
 {
 #ifdef CONFIG_KASAN
 	init_task.kasan_depth = 0;
-	sclp_early_printk("KernelAddressSanitizer initialized\n");
+	pr_info("KernelAddressSanitizer initialized\n");
 #endif
 }
 

arch/s390/kernel/setup.c

@@ -157,6 +157,12 @@ u64 __bootdata_preserved(stfle_fac_list[16]);
 EXPORT_SYMBOL(stfle_fac_list);
 struct oldmem_data __bootdata_preserved(oldmem_data);
 
+char __bootdata(boot_rb)[PAGE_SIZE * 2];
+bool __bootdata(boot_earlyprintk);
+size_t __bootdata(boot_rb_off);
+char __bootdata(bootdebug_filter)[128];
+bool __bootdata(bootdebug);
+
 unsigned long __bootdata_preserved(VMALLOC_START);
 EXPORT_SYMBOL(VMALLOC_START);
 
@@ -686,7 +692,7 @@ static void __init reserve_physmem_info(void)
 {
 	unsigned long addr, size;
 
-	if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
+	if (get_physmem_reserved(RR_MEM_DETECT_EXT, &addr, &size))
 		memblock_reserve(addr, size);
 }
 
@@ -694,7 +700,7 @@ static void __init free_physmem_info(void)
 {
 	unsigned long addr, size;
 
-	if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
+	if (get_physmem_reserved(RR_MEM_DETECT_EXT, &addr, &size))
 		memblock_phys_free(addr, size);
 }
 
@@ -724,7 +730,7 @@ static void __init reserve_lowcore(void)
 	void *lowcore_end = lowcore_start + sizeof(struct lowcore);
 	void *start, *end;
 
-	if ((void *)__identity_base < lowcore_end) {
+	if (absolute_pointer(__identity_base) < lowcore_end) {
 		start = max(lowcore_start, (void *)__identity_base);
 		end = min(lowcore_end, (void *)(__identity_base + ident_map_size));
 		memblock_reserve(__pa(start), __pa(end));
@@ -865,6 +871,23 @@ static void __init log_component_list(void)
 	}
 }
 
+/*
+ * Print avoiding interpretation of % in buf and taking bootdebug option
+ * into consideration.
+ */
+static void __init print_rb_entry(const char *buf)
+{
+	char fmt[] = KERN_SOH "0boot: %s";
+	int level = printk_get_level(buf);
+
+	buf = skip_timestamp(printk_skip_level(buf));
+	if (level == KERN_DEBUG[1] && (!bootdebug || !bootdebug_filter_match(buf)))
+		return;
+
+	fmt[1] = level;
+	printk(fmt, buf);
+}
+
 /*
  * Setup function called from init/main.c just after the banner
  * was printed.
@@ -884,6 +907,9 @@ void __init setup_arch(char **cmdline_p)
 		pr_info("Linux is running natively in 64-bit mode\n");
 	else
 		pr_info("Linux is running as a guest in 64-bit mode\n");
+	/* Print decompressor messages if not already printed */
+	if (!boot_earlyprintk)
+		boot_rb_foreach(print_rb_entry);
 
 	if (have_relocated_lowcore())
 		pr_info("Lowcore relocated to 0x%px\n", get_lowcore());
@@ -987,3 +1013,8 @@ void __init setup_arch(char **cmdline_p)
 	/* Add system specific data to the random pool */
 	setup_randomness();
 }
+
+void __init arch_cpu_finalize_init(void)
+{
+	sclp_init();
+}

arch/s390/kernel/vmlinux.lds.S

@@ -52,7 +52,6 @@ SECTIONS
 		SOFTIRQENTRY_TEXT
 		FTRACE_HOTPATCH_TRAMPOLINES_TEXT
 		*(.text.*_indirect_*)
-		*(.fixup)
 		*(.gnu.warning)
 		. = ALIGN(PAGE_SIZE);
 		_etext = .;		/* End of text section */

arch/s390/lib/uaccess.c

@@ -31,51 +31,6 @@ void debug_user_asce(int exit)
 }
 #endif /*CONFIG_DEBUG_ENTRY */
 
-static unsigned long raw_copy_from_user_key(void *to, const void __user *from,
-					    unsigned long size, unsigned long key)
-{
-	unsigned long rem;
-	union oac spec = {
-		.oac2.key = key,
-		.oac2.as = PSW_BITS_AS_SECONDARY,
-		.oac2.k = 1,
-		.oac2.a = 1,
-	};
-
-	asm volatile(
-		"	lr	0,%[spec]\n"
-		"0:	mvcos	0(%[to]),0(%[from]),%[size]\n"
-		"1:	jz	5f\n"
-		"	algr	%[size],%[val]\n"
-		"	slgr	%[from],%[val]\n"
-		"	slgr	%[to],%[val]\n"
-		"	j	0b\n"
-		"2:	la	%[rem],4095(%[from])\n"	/* rem = from + 4095 */
-		"	nr	%[rem],%[val]\n"	/* rem = (from + 4095) & -4096 */
-		"	slgr	%[rem],%[from]\n"
-		"	clgr	%[size],%[rem]\n"	/* copy crosses next page boundary? */
-		"	jnh	6f\n"
-		"3:	mvcos	0(%[to]),0(%[from]),%[rem]\n"
-		"4:	slgr	%[size],%[rem]\n"
-		"	j	6f\n"
-		"5:	slgr	%[size],%[size]\n"
-		"6:\n"
-		EX_TABLE(0b, 2b)
-		EX_TABLE(1b, 2b)
-		EX_TABLE(3b, 6b)
-		EX_TABLE(4b, 6b)
-		: [size] "+&a" (size), [from] "+&a" (from), [to] "+&a" (to), [rem] "=&a" (rem)
-		: [val] "a" (-4096UL), [spec] "d" (spec.val)
-		: "cc", "memory", "0");
-	return size;
-}
-
-unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n)
-{
-	return raw_copy_from_user_key(to, from, n, 0);
-}
-EXPORT_SYMBOL(raw_copy_from_user);
-
 unsigned long _copy_from_user_key(void *to, const void __user *from,
 				  unsigned long n, unsigned long key)
 {
@@ -93,51 +48,6 @@ unsigned long _copy_from_user_key(void *to, const void __user *from,
 }
 EXPORT_SYMBOL(_copy_from_user_key);
 
-static unsigned long raw_copy_to_user_key(void __user *to, const void *from,
-					  unsigned long size, unsigned long key)
-{
-	unsigned long rem;
-	union oac spec = {
-		.oac1.key = key,
-		.oac1.as = PSW_BITS_AS_SECONDARY,
-		.oac1.k = 1,
-		.oac1.a = 1,
-	};
-
-	asm volatile(
-		"	lr	0,%[spec]\n"
-		"0:	mvcos	0(%[to]),0(%[from]),%[size]\n"
-		"1:	jz	5f\n"
-		"	algr	%[size],%[val]\n"
-		"	slgr	%[to],%[val]\n"
-		"	slgr	%[from],%[val]\n"
-		"	j	0b\n"
-		"2:	la	%[rem],4095(%[to])\n"	/* rem = to + 4095 */
-		"	nr	%[rem],%[val]\n"	/* rem = (to + 4095) & -4096 */
-		"	slgr	%[rem],%[to]\n"
-		"	clgr	%[size],%[rem]\n"	/* copy crosses next page boundary? */
-		"	jnh	6f\n"
-		"3:	mvcos	0(%[to]),0(%[from]),%[rem]\n"
-		"4:	slgr	%[size],%[rem]\n"
-		"	j	6f\n"
-		"5:	slgr	%[size],%[size]\n"
-		"6:\n"
-		EX_TABLE(0b, 2b)
-		EX_TABLE(1b, 2b)
-		EX_TABLE(3b, 6b)
-		EX_TABLE(4b, 6b)
-		: [size] "+&a" (size), [to] "+&a" (to), [from] "+&a" (from), [rem] "=&a" (rem)
-		: [val] "a" (-4096UL), [spec] "d" (spec.val)
-		: "cc", "memory", "0");
-	return size;
-}
-
-unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n)
-{
-	return raw_copy_to_user_key(to, from, n, 0);
-}
-EXPORT_SYMBOL(raw_copy_to_user);
-
 unsigned long _copy_to_user_key(void __user *to, const void *from,
 				unsigned long n, unsigned long key)
 {

arch/s390/mm/extable.c

@@ -7,6 +7,7 @@
 #include <linux/panic.h>
 #include <asm/asm-extable.h>
 #include <asm/extable.h>
+#include <asm/fpu.h>
 
 const struct exception_table_entry *s390_search_extables(unsigned long addr)
 {
@@ -26,7 +27,7 @@ static bool ex_handler_fixup(const struct exception_table_entry *ex, struct pt_r
 	return true;
 }
 
-static bool ex_handler_ua_store(const struct exception_table_entry *ex, struct pt_regs *regs)
+static bool ex_handler_ua_fault(const struct exception_table_entry *ex, struct pt_regs *regs)
 {
 	unsigned int reg_err = FIELD_GET(EX_DATA_REG_ERR, ex->data);
 
@@ -35,18 +36,6 @@ static bool ex_handler_ua_store(const struct exception_table_entry *ex, struct p
 	return true;
 }
 
-static bool ex_handler_ua_load_mem(const struct exception_table_entry *ex, struct pt_regs *regs)
-{
-	unsigned int reg_addr = FIELD_GET(EX_DATA_REG_ADDR, ex->data);
-	unsigned int reg_err = FIELD_GET(EX_DATA_REG_ERR, ex->data);
-	size_t len = FIELD_GET(EX_DATA_LEN, ex->data);
-
-	regs->gprs[reg_err] = -EFAULT;
-	memset((void *)regs->gprs[reg_addr], 0, len);
-	regs->psw.addr = extable_fixup(ex);
-	return true;
-}
-
 static bool ex_handler_ua_load_reg(const struct exception_table_entry *ex,
 				   bool pair, struct pt_regs *regs)
 {
@@ -77,6 +66,13 @@ static bool ex_handler_zeropad(const struct exception_table_entry *ex, struct pt
 	return true;
 }
 
+static bool ex_handler_fpc(const struct exception_table_entry *ex, struct pt_regs *regs)
+{
+	fpu_sfpc(0);
+	regs->psw.addr = extable_fixup(ex);
+	return true;
+}
+
 bool fixup_exception(struct pt_regs *regs)
 {
 	const struct exception_table_entry *ex;
@@ -89,16 +85,16 @@ bool fixup_exception(struct pt_regs *regs)
 		return ex_handler_fixup(ex, regs);
 	case EX_TYPE_BPF:
 		return ex_handler_bpf(ex, regs);
-	case EX_TYPE_UA_STORE:
+	case EX_TYPE_UA_FAULT:
-		return ex_handler_ua_store(ex, regs);
+		return ex_handler_ua_fault(ex, regs);
-	case EX_TYPE_UA_LOAD_MEM:
-		return ex_handler_ua_load_mem(ex, regs);
 	case EX_TYPE_UA_LOAD_REG:
 		return ex_handler_ua_load_reg(ex, false, regs);
 	case EX_TYPE_UA_LOAD_REGPAIR:
 		return ex_handler_ua_load_reg(ex, true, regs);
 	case EX_TYPE_ZEROPAD:
 		return ex_handler_zeropad(ex, regs);
+	case EX_TYPE_FPC:
+		return ex_handler_fpc(ex, regs);
 	}
 	panic("invalid exception table entry");
 }

arch/s390/mm/vmem.c

@@ -662,7 +662,7 @@ void __init vmem_map_init(void)
 	if (!static_key_enabled(&cpu_has_bear))
 		set_memory_x(0, 1);
 	if (debug_pagealloc_enabled())
-		__set_memory_4k(__va(0), __va(0) + ident_map_size);
+		__set_memory_4k(__va(0), absolute_pointer(__va(0)) + ident_map_size);
 	pr_info("Write protected kernel read-only data: %luk\n",
 		(unsigned long)(__end_rodata - _stext) >> 10);
 }

arch/s390/pci/pci_bus.c

@@ -171,7 +171,6 @@ void zpci_bus_scan_busses(void)
 static bool zpci_bus_is_multifunction_root(struct zpci_dev *zdev)
 {
 	return !s390_pci_no_rid && zdev->rid_available &&
-		zpci_is_device_configured(zdev) &&
 		!zdev->vfn;
 }
 

arch/s390/purgatory/Makefile

@@ -13,7 +13,7 @@ CFLAGS_sha256.o := -D__DISABLE_EXPORTS -D__NO_FORTIFY
 $(obj)/mem.o: $(srctree)/arch/s390/lib/mem.S FORCE
 	$(call if_changed_rule,as_o_S)
 
-KBUILD_CFLAGS := -fno-strict-aliasing -Wall -Wstrict-prototypes
+KBUILD_CFLAGS := -std=gnu11 -fno-strict-aliasing -Wall -Wstrict-prototypes
 KBUILD_CFLAGS += -Wno-pointer-sign -Wno-sign-compare
 KBUILD_CFLAGS += -fno-zero-initialized-in-bss -fno-builtin -ffreestanding
 KBUILD_CFLAGS += -Os -m64 -msoft-float -fno-common

arch/s390/tools/gen_opcode_table.c

@@ -201,6 +201,17 @@ static int cmp_long_insn(const void *a, const void *b)
 	return strcmp(((struct insn *)a)->name, ((struct insn *)b)->name);
 }
 
+static void print_insn_name(const char *name)
+{
+	size_t i, len;
+
+	len = strlen(name);
+	printf("{");
+	for (i = 0; i < len; i++)
+		printf(" \'%c\',", name[i]);
+	printf(" }");
+}
+
 static void print_long_insn(struct gen_opcode *desc)
 {
 	struct insn *insn;
@@ -223,7 +234,9 @@ static void print_long_insn(struct gen_opcode *desc)
 		insn = &desc->insn[i];
 		if (insn->name_len < 6)
 			continue;
-		printf("\t[LONG_INSN_%s] = \"%s\", \\\n", insn->upper, insn->name);
+		printf("\t[LONG_INSN_%s] = ", insn->upper);
+		print_insn_name(insn->name);
+		printf(", \\\n");
 	}
 	printf("}\n\n");
 }
@@ -236,10 +249,12 @@ static void print_opcode(struct insn *insn, int nr)
 	if (insn->type->byte != 0)
 		opcode += 2;
 	printf("\t[%4d] = { .opfrag = 0x%s, .format = INSTR_%s, ", nr, opcode, insn->format);
-	if (insn->name_len < 6)
+	if (insn->name_len < 6) {
-		printf(".name = \"%s\" ", insn->name);
+		printf(".name =  ");
-	else
+		print_insn_name(insn->name);
+	} else {
 		printf(".offset = LONG_INSN_%s", insn->upper);
+	}
 	printf(" }, \\\n");
 }
 

drivers/s390/char/sclp.c

@@ -245,7 +245,6 @@ static void sclp_request_timeout(bool force_restart);
 static void sclp_process_queue(void);
 static void __sclp_make_read_req(void);
 static int sclp_init_mask(int calculate);
-static int sclp_init(void);
 
 static void
 __sclp_queue_read_req(void)
@@ -1251,8 +1250,7 @@ static struct platform_driver sclp_pdrv = {
 
 /* Initialize SCLP driver. Return zero if driver is operational, non-zero
  * otherwise. */
-static int
+int sclp_init(void)
-sclp_init(void)
 {
 	unsigned long flags;
 	int rc = 0;
@@ -1305,13 +1303,7 @@ sclp_init(void)
 
 static __init int sclp_initcall(void)
 {
-	int rc;
+	return platform_driver_register(&sclp_pdrv);
-
-	rc = platform_driver_register(&sclp_pdrv);
-	if (rc)
-		return rc;
-
-	return sclp_init();
 }
 
 arch_initcall(sclp_initcall);

drivers/s390/char/vmlogrdr.c

@@ -123,7 +123,7 @@ static DECLARE_WAIT_QUEUE_HEAD(read_wait_queue);
  */
 
 static struct vmlogrdr_priv_t sys_ser[] = {
-	{ .system_service = "*LOGREC ",
+	{ .system_service = { '*', 'L', 'O', 'G', 'R', 'E', 'C', ' ' },
 	  .internal_name  = "logrec",
 	  .recording_name = "EREP",
 	  .minor_num      = 0,
@@ -132,7 +132,7 @@ static struct vmlogrdr_priv_t sys_ser[] = {
 	  .autorecording  = 1,
 	  .autopurge      = 1,
 	},
-	{ .system_service = "*ACCOUNT",
+	{ .system_service = { '*', 'A', 'C', 'C', 'O', 'U', 'N', 'T' },
 	  .internal_name  = "account",
 	  .recording_name = "ACCOUNT",
 	  .minor_num      = 1,
@@ -141,7 +141,7 @@ static struct vmlogrdr_priv_t sys_ser[] = {
 	  .autorecording  = 1,
 	  .autopurge      = 1,
 	},
-	{ .system_service = "*SYMPTOM",
+	{ .system_service = { '*', 'S', 'Y', 'M', 'P', 'T', 'O', 'M' },
 	  .internal_name  = "symptom",
 	  .recording_name = "SYMPTOM",
 	  .minor_num      = 2,
@@ -356,7 +356,7 @@ static int vmlogrdr_open (struct inode *inode, struct file *filp)
 	if (connect_rc) {
 		pr_err("vmlogrdr: iucv connection to %s "
 		       "failed with rc %i \n",
-		       logptr->system_service, connect_rc);
+		       logptr->internal_name, connect_rc);
 		goto out_path;
 	}