Merge tag 's390-5.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Vasily Gorbik:

 - Add support for IBM z15 machines.

 - Add SHA3 and CCA AES cipher key support in zcrypt and pkey
   refactoring.

 - Move to arch_stack_walk infrastructure for the stack unwinder.

 - Various kasan fixes and improvements.

 - Various command line parsing fixes.

 - Improve decompressor phase debuggability.

 - Lift no bss usage restriction for the early code.

 - Use refcount_t for reference counters for couple of places in mm
   code.

 - Logging improvements and return code fix in vfio-ccw code.

 - Couple of zpci fixes and minor refactoring.

 - Remove some outdated documentation.

 - Fix secure boot detection.

 - Other various minor code clean ups.

* tag 's390-5.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (48 commits)
  s390: remove pointless drivers-y in drivers/s390/Makefile
  s390/cpum_sf: Fix line length and format string
  s390/pci: fix MSI message data
  s390: add support for IBM z15 machines
  s390/crypto: Support for SHA3 via CPACF (MSA6)
  s390/startup: add pgm check info printing
  s390/crypto: xts-aes-s390 fix extra run-time crypto self tests finding
  vfio-ccw: fix error return code in vfio_ccw_sch_init()
  s390: vfio-ap: fix warning reset not completed
  s390/base: remove unused s390_base_mcck_handler
  s390/sclp: Fix bit checked for has_sipl
  s390/zcrypt: fix wrong handling of cca cipher keygenflags
  s390/kasan: add kdump support
  s390/setup: avoid using strncmp with hardcoded length
  s390/sclp: avoid using strncmp with hardcoded length
  s390/module: avoid using strncmp with hardcoded length
  s390/pci: avoid using strncmp with hardcoded length
  s390/kaslr: reserve memory for kasan usage
  s390/mem_detect: provide single get_mem_detect_end
  s390/cmma: reuse kstrtobool for option value parsing
  ...

12 files changed, 76 insertions, 174 deletions

diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 0f255b54b051..7edbbcd8228a 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -10,20 +10,12 @@ CFLAGS_REMOVE_ftrace.o		= $(CC_FLAGS_FTRACE)
 
 # Do not trace early setup code
 CFLAGS_REMOVE_early.o		= $(CC_FLAGS_FTRACE)
-CFLAGS_REMOVE_early_nobss.o	= $(CC_FLAGS_FTRACE)
 
 endif
 
 GCOV_PROFILE_early.o		:= n
-GCOV_PROFILE_early_nobss.o	:= n
-
 KCOV_INSTRUMENT_early.o		:= n
-KCOV_INSTRUMENT_early_nobss.o	:= n
-
 UBSAN_SANITIZE_early.o		:= n
-UBSAN_SANITIZE_early_nobss.o	:= n
-
-KASAN_SANITIZE_early_nobss.o	:= n
 KASAN_SANITIZE_ipl.o		:= n
 KASAN_SANITIZE_machine_kexec.o	:= n
 
@@ -48,7 +40,7 @@ CFLAGS_ptrace.o		+= -DUTS_MACHINE='"$(UTS_MACHINE)"'
 
 obj-y	:= traps.o time.o process.o base.o early.o setup.o idle.o vtime.o
 obj-y	+= processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
-obj-y	+= debug.o irq.o ipl.o dis.o diag.o vdso.o early_nobss.o
+obj-y	+= debug.o irq.o ipl.o dis.o diag.o vdso.o
 obj-y	+= sysinfo.o lgr.o os_info.o machine_kexec.o pgm_check.o
 obj-y	+= runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o sthyi.o
 obj-y	+= entry.o reipl.o relocate_kernel.o kdebugfs.o alternative.o
@@ -90,6 +82,3 @@ obj-$(CONFIG_TRACEPOINTS)	+= trace.o
 # vdso
 obj-y				+= vdso64/
 obj-$(CONFIG_COMPAT_VDSO)	+= vdso32/
-
-chkbss := head64.o early_nobss.o
-include $(srctree)/arch/s390/scripts/Makefile.chkbss
diff --git a/arch/s390/kernel/base.S b/arch/s390/kernel/base.S
index 2f39ea57f358..b79e0fd571f8 100644
--- a/arch/s390/kernel/base.S
+++ b/arch/s390/kernel/base.S
@@ -16,27 +16,6 @@
 	GEN_BR_THUNK %r9
 	GEN_BR_THUNK %r14
 
-ENTRY(s390_base_mcck_handler)
-	basr	%r13,0
-0:	lg	%r15,__LC_NODAT_STACK	# load panic stack
-	aghi	%r15,-STACK_FRAME_OVERHEAD
-	larl	%r1,s390_base_mcck_handler_fn
-	lg	%r9,0(%r1)
-	ltgr	%r9,%r9
-	jz	1f
-	BASR_EX	%r14,%r9
-1:	la	%r1,4095
-	lmg	%r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)
-	lpswe	__LC_MCK_OLD_PSW
-ENDPROC(s390_base_mcck_handler)
-
-	.section .bss
-	.align 8
-	.globl	s390_base_mcck_handler_fn
-s390_base_mcck_handler_fn:
-	.quad	0
-	.previous
-
 ENTRY(s390_base_ext_handler)
 	stmg	%r0,%r15,__LC_SAVE_AREA_ASYNC
 	basr	%r13,0
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 6312fed48530..b432d63d0b37 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -32,6 +32,21 @@
 #include <asm/boot_data.h>
 #include "entry.h"
 
+static void __init reset_tod_clock(void)
+{
+	u64 time;
+
+	if (store_tod_clock(&time) == 0)
+		return;
+	/* TOD clock not running. Set the clock to Unix Epoch. */
+	if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0)
+		disabled_wait();
+
+	memset(tod_clock_base, 0, 16);
+	*(__u64 *) &tod_clock_base[1] = TOD_UNIX_EPOCH;
+	S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
+}
+
 /*
  * Initialize storage key for kernel pages
  */
@@ -301,6 +316,7 @@ static void __init check_image_bootable(void)
 
 void __init startup_init(void)
 {
+	reset_tod_clock();
 	check_image_bootable();
 	time_early_init();
 	init_kernel_storage_key();
diff --git a/arch/s390/kernel/early_nobss.c b/arch/s390/kernel/early_nobss.c
deleted file mode 100644
index 52a3ef959341..000000000000
--- a/arch/s390/kernel/early_nobss.c
+++ /dev/null
@@ -1,45 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- *    Copyright IBM Corp. 2007, 2018
- */
-
-/*
- * Early setup functions which may not rely on an initialized bss
- * section. The last thing that is supposed to happen here is
- * initialization of the bss section.
- */
-
-#include <linux/processor.h>
-#include <linux/string.h>
-#include <asm/sections.h>
-#include <asm/lowcore.h>
-#include <asm/timex.h>
-#include <asm/kasan.h>
-#include "entry.h"
-
-static void __init reset_tod_clock(void)
-{
-	u64 time;
-
-	if (store_tod_clock(&time) == 0)
-		return;
-	/* TOD clock not running. Set the clock to Unix Epoch. */
-	if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0)
-		disabled_wait();
-
-	memset(tod_clock_base, 0, 16);
-	*(__u64 *) &tod_clock_base[1] = TOD_UNIX_EPOCH;
-	S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
-}
-
-static void __init clear_bss_section(void)
-{
-	memset(__bss_start, 0, __bss_stop - __bss_start);
-}
-
-void __init startup_init_nobss(void)
-{
-	reset_tod_clock();
-	clear_bss_section();
-	kasan_early_init();
-}
diff --git a/arch/s390/kernel/early_printk.c b/arch/s390/kernel/early_printk.c
index 40c1dfec944e..6f24d83bc5dc 100644
--- a/arch/s390/kernel/early_printk.c
+++ b/arch/s390/kernel/early_printk.c
@@ -25,7 +25,7 @@ static int __init setup_early_printk(char *buf)
 	if (early_console)
 		return 0;
 	/* Accept only "earlyprintk" and "earlyprintk=sclp" */
-	if (buf && strncmp(buf, "sclp", 4))
+	if (buf && !str_has_prefix(buf, "sclp"))
 		return 0;
 	if (!sclp.has_linemode && !sclp.has_vt220)
 		return 0;
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index f384a18e6c26..0d9ee198f4eb 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -34,11 +34,9 @@ ENTRY(startup_continue)
 	larl	%r14,init_task
 	stg	%r14,__LC_CURRENT
 	larl	%r15,init_thread_union+THREAD_SIZE-STACK_FRAME_OVERHEAD
-#
-# Early setup functions that may not rely on an initialized bss section,
-# like moving the initrd. Returns with an initialized bss section.
-#
-	brasl	%r14,startup_init_nobss
+#ifdef CONFIG_KASAN
+	brasl	%r14,kasan_early_init
+#endif
 #
 # Early machine initialization and detection functions.
 #
diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c
index 31889db609e9..ba8f19bb438b 100644
--- a/arch/s390/kernel/module.c
+++ b/arch/s390/kernel/module.c
@@ -472,11 +472,11 @@ int module_finalize(const Elf_Ehdr *hdr,
 			apply_alternatives(aseg, aseg + s->sh_size);
 
 		if (IS_ENABLED(CONFIG_EXPOLINE) &&
-		    (!strncmp(".s390_indirect", secname, 14)))
+		    (str_has_prefix(secname, ".s390_indirect")))
 			nospec_revert(aseg, aseg + s->sh_size);
 
 		if (IS_ENABLED(CONFIG_EXPOLINE) &&
-		    (!strncmp(".s390_return", secname, 12)))
+		    (str_has_prefix(secname, ".s390_return")))
 			nospec_revert(aseg, aseg + s->sh_size);
 	}
 
diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c
index 1266194afb02..292a452cd1f3 100644
--- a/arch/s390/kernel/perf_cpum_sf.c
+++ b/arch/s390/kernel/perf_cpum_sf.c
@@ -514,7 +514,6 @@ static void extend_sampling_buffer(struct sf_buffer *sfb,
 				    sfb_pending_allocs(sfb, hwc));
 }
 
-
 /* Number of perf events counting hardware events */
 static atomic_t num_events;
 /* Used to avoid races in calling reserve/release_cpumf_hardware */
@@ -923,9 +922,10 @@ static void cpumsf_pmu_enable(struct pmu *pmu)
 	lpp(&S390_lowcore.lpp);
 
 	debug_sprintf_event(sfdbg, 6, "pmu_enable: es=%i cs=%i ed=%i cd=%i "
-			    "tear=%p dear=%p\n", cpuhw->lsctl.es, cpuhw->lsctl.cs,
-			    cpuhw->lsctl.ed, cpuhw->lsctl.cd,
-			    (void *) cpuhw->lsctl.tear, (void *) cpuhw->lsctl.dear);
+			    "tear=%p dear=%p\n", cpuhw->lsctl.es,
+			    cpuhw->lsctl.cs, cpuhw->lsctl.ed, cpuhw->lsctl.cd,
+			    (void *) cpuhw->lsctl.tear,
+			    (void *) cpuhw->lsctl.dear);
 }
 
 static void cpumsf_pmu_disable(struct pmu *pmu)
@@ -1083,7 +1083,8 @@ static void debug_sample_entry(struct hws_basic_entry *sample,
 			       struct hws_trailer_entry *te)
 {
 	debug_sprintf_event(sfdbg, 4, "hw_collect_samples: Found unknown "
-			    "sampling data entry: te->f=%i basic.def=%04x (%p)\n",
+			    "sampling data entry: te->f=%i basic.def=%04x "
+			    "(%p)\n",
 			    te->f, sample->def, sample);
 }
 
@@ -1216,7 +1217,7 @@ static void hw_perf_event_update(struct perf_event *event, int flush_all)
 
 		/* Timestamps are valid for full sample-data-blocks only */
 		debug_sprintf_event(sfdbg, 6, "hw_perf_event_update: sdbt=%p "
-				    "overflow=%llu timestamp=0x%llx\n",
+				    "overflow=%llu timestamp=%#llx\n",
 				    sdbt, te->overflow,
 				    (te->f) ? trailer_timestamp(te) : 0ULL);
 
@@ -1879,10 +1880,12 @@ static struct attribute_group cpumsf_pmu_events_group = {
 	.name = "events",
 	.attrs = cpumsf_pmu_events_attr,
 };
+
 static struct attribute_group cpumsf_pmu_format_group = {
 	.name = "format",
 	.attrs = cpumsf_pmu_format_attr,
 };
+
 static const struct attribute_group *cpumsf_pmu_attr_groups[] = {
 	&cpumsf_pmu_events_group,
 	&cpumsf_pmu_format_group,
@@ -1938,7 +1941,8 @@ static void cpumf_measurement_alert(struct ext_code ext_code,
 
 	/* Report measurement alerts only for non-PRA codes */
 	if (alert != CPU_MF_INT_SF_PRA)
-		debug_sprintf_event(sfdbg, 6, "measurement alert: 0x%x\n", alert);
+		debug_sprintf_event(sfdbg, 6, "measurement alert: %#x\n",
+				    alert);
 
 	/* Sampling authorization change request */
 	if (alert & CPU_MF_INT_SF_SACA)
@@ -1959,6 +1963,7 @@ static void cpumf_measurement_alert(struct ext_code ext_code,
 		sf_disable();
 	}
 }
+
 static int cpusf_pmu_setup(unsigned int cpu, int flags)
 {
 	/* Ignore the notification if no events are scheduled on the PMU.
@@ -2096,5 +2101,6 @@ static int __init init_cpum_sampling_pmu(void)
 out:
 	return err;
 }
+
 arch_initcall(init_cpum_sampling_pmu);
 core_param(cpum_sfb_size, CPUM_SF_MAX_SDB, sfb_size, 0640);
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 63873aa6693f..b0afec673f77 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -184,20 +184,30 @@ unsigned long get_wchan(struct task_struct *p)
 
 	if (!p || p == current || p->state == TASK_RUNNING || !task_stack_page(p))
 		return 0;
+
+	if (!try_get_task_stack(p))
+		return 0;
+
 	low = task_stack_page(p);
 	high = (struct stack_frame *) task_pt_regs(p);
 	sf = (struct stack_frame *) p->thread.ksp;
-	if (sf <= low || sf > high)
-		return 0;
+	if (sf <= low || sf > high) {
+		return_address = 0;
+		goto out;
+	}
 	for (count = 0; count < 16; count++) {
-		sf = (struct stack_frame *) sf->back_chain;
-		if (sf <= low || sf > high)
-			return 0;
-		return_address = sf->gprs[8];
+		sf = (struct stack_frame *)READ_ONCE_NOCHECK(sf->back_chain);
+		if (sf <= low || sf > high) {
+			return_address = 0;
+			goto out;
+		}
+		return_address = READ_ONCE_NOCHECK(sf->gprs[8]);
 		if (!in_sched_functions(return_address))
-			return return_address;
+			goto out;
 	}
-	return 0;
+out:
+	put_task_stack(p);
+	return return_address;
 }
 
 unsigned long arch_align_stack(unsigned long sp)
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 253177900950..3ff291bc63b7 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -99,6 +99,7 @@ int __bootdata_preserved(prot_virt_guest);
 int __bootdata(noexec_disabled);
 int __bootdata(memory_end_set);
 unsigned long __bootdata(memory_end);
+unsigned long __bootdata(vmalloc_size);
 unsigned long __bootdata(max_physmem_end);
 struct mem_detect_info __bootdata(mem_detect);
 
@@ -168,15 +169,15 @@ static void __init set_preferred_console(void)
 static int __init conmode_setup(char *str)
 {
 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
-	if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
+	if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
                 SET_CONSOLE_SCLP;
 #endif
 #if defined(CONFIG_TN3215_CONSOLE)
-	if (strncmp(str, "3215", 5) == 0)
+	if (!strcmp(str, "3215"))
 		SET_CONSOLE_3215;
 #endif
 #if defined(CONFIG_TN3270_CONSOLE)
-	if (strncmp(str, "3270", 5) == 0)
+	if (!strcmp(str, "3270"))
 		SET_CONSOLE_3270;
 #endif
 	set_preferred_console();
@@ -211,7 +212,7 @@ static void __init conmode_default(void)
 #endif
 			return;
 		}
-		if (strncmp(ptr + 8, "3270", 4) == 0) {
+		if (str_has_prefix(ptr + 8, "3270")) {
 #if defined(CONFIG_TN3270_CONSOLE)
 			SET_CONSOLE_3270;
 #elif defined(CONFIG_TN3215_CONSOLE)
@@ -219,7 +220,7 @@ static void __init conmode_default(void)
 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 			SET_CONSOLE_SCLP;
 #endif
-		} else if (strncmp(ptr + 8, "3215", 4) == 0) {
+		} else if (str_has_prefix(ptr + 8, "3215")) {
 #if defined(CONFIG_TN3215_CONSOLE)
 			SET_CONSOLE_3215;
 #elif defined(CONFIG_TN3270_CONSOLE)
@@ -302,15 +303,6 @@ void machine_power_off(void)
 void (*pm_power_off)(void) = machine_power_off;
 EXPORT_SYMBOL_GPL(pm_power_off);
 
-static int __init parse_vmalloc(char *arg)
-{
-	if (!arg)
-		return -EINVAL;
-	VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
-	return 0;
-}
-early_param("vmalloc", parse_vmalloc);
-
 void *restart_stack __section(.data);
 
 unsigned long stack_alloc(void)
@@ -563,10 +555,9 @@ static void __init setup_resources(void)
 
 static void __init setup_memory_end(void)
 {
-	unsigned long vmax, vmalloc_size, tmp;
+	unsigned long vmax, tmp;
 
 	/* Choose kernel address space layout: 3 or 4 levels. */
-	vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
 	if (IS_ENABLED(CONFIG_KASAN)) {
 		vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)
 			   ? _REGION1_SIZE
@@ -990,6 +981,10 @@ static int __init setup_hwcaps(void)
 	case 0x3907:
 		strcpy(elf_platform, "z14");
 		break;
+	case 0x8561:
+	case 0x8562:
+		strcpy(elf_platform, "z15");
+		break;
 	}
 
 	/*
diff --git a/arch/s390/kernel/stacktrace.c b/arch/s390/kernel/stacktrace.c
index f6a620f854e1..f8fc4f8aef9b 100644
--- a/arch/s390/kernel/stacktrace.c
+++ b/arch/s390/kernel/stacktrace.c
@@ -6,57 +6,19 @@
  *  Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
  */
 
-#include <linux/sched.h>
-#include <linux/sched/debug.h>
 #include <linux/stacktrace.h>
-#include <linux/kallsyms.h>
-#include <linux/export.h>
 #include <asm/stacktrace.h>
 #include <asm/unwind.h>
 
-void save_stack_trace(struct stack_trace *trace)
+void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
+		     struct task_struct *task, struct pt_regs *regs)
 {
 	struct unwind_state state;
+	unsigned long addr;
 
-	unwind_for_each_frame(&state, current, NULL, 0) {
-		if (trace->nr_entries >= trace->max_entries)
+	unwind_for_each_frame(&state, task, regs, 0) {
+		addr = unwind_get_return_address(&state);
+		if (!addr || !consume_entry(cookie, addr, false))
 			break;
-		if (trace->skip > 0)
-			trace->skip--;
-		else
-			trace->entries[trace->nr_entries++] = state.ip;
 	}
 }
-EXPORT_SYMBOL_GPL(save_stack_trace);
-
-void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
-{
-	struct unwind_state state;
-
-	unwind_for_each_frame(&state, tsk, NULL, 0) {
-		if (trace->nr_entries >= trace->max_entries)
-			break;
-		if (in_sched_functions(state.ip))
-			continue;
-		if (trace->skip > 0)
-			trace->skip--;
-		else
-			trace->entries[trace->nr_entries++] = state.ip;
-	}
-}
-EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
-
-void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
-{
-	struct unwind_state state;
-
-	unwind_for_each_frame(&state, current, regs, 0) {
-		if (trace->nr_entries >= trace->max_entries)
-			break;
-		if (trace->skip > 0)
-			trace->skip--;
-		else
-			trace->entries[trace->nr_entries++] = state.ip;
-	}
-}
-EXPORT_SYMBOL_GPL(save_stack_trace_regs);
diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
index c6bc190f3c28..ed1fc08ccea2 100644
--- a/arch/s390/kernel/vdso.c
+++ b/arch/s390/kernel/vdso.c
@@ -97,21 +97,13 @@ static const struct vm_special_mapping vdso_mapping = {
 	.mremap = vdso_mremap,
 };
 
-static int __init vdso_setup(char *s)
+static int __init vdso_setup(char *str)
 {
-	unsigned long val;
-	int rc;
+	bool enabled;
 
-	rc = 0;
-	if (strncmp(s, "on", 3) == 0)
-		vdso_enabled = 1;
-	else if (strncmp(s, "off", 4) == 0)
-		vdso_enabled = 0;
-	else {
-		rc = kstrtoul(s, 0, &val);
-		vdso_enabled = rc ? 0 : !!val;
-	}
-	return !rc;
+	if (!kstrtobool(str, &enabled))
+		vdso_enabled = enabled;
+	return 1;
 }
 __setup("vdso=", vdso_setup);