Merge tag 's390-5.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull more s390 updates from Vasily Gorbik:

 - Fix preempt_count initialization.

 - Rework call_on_stack() macro to add proper type handling and avoid
   possible register corruption.

 - More error prone "register asm" removal and fixes.

 - Fix syscall restarting when multiple signals are coming in. This adds
   minimalistic trampolines to vdso so we can return from signal without
   using the stack which requires pgm check handler hacks when NX is
   enabled.

 - Remove HAVE_IRQ_EXIT_ON_IRQ_STACK since this is no longer true after
   switch to generic entry.

 - Fix protected virtualization secure storage access exception
   handling.

 - Make machine check C handler always enter with DAT enabled and move
   register validation to C code.

 - Fix tinyconfig boot problem by avoiding MONITOR CALL without
   CONFIG_BUG.

 - Increase asm symbols alignment to 16 to make it consistent with
   compilers.

 - Enable concurrent access to the CPU Measurement Counter Facility.

 - Add support for dynamic AP bus size limit and rework ap_dqap to deal
   with messages greater than recv buffer.

* tag 's390-5.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (41 commits)
  s390: preempt: Fix preempt_count initialization
  s390/linkage: increase asm symbols alignment to 16
  s390: rename CALL_ON_STACK_NORETURN() to call_on_stack_noreturn()
  s390: add type checking to CALL_ON_STACK_NORETURN() macro
  s390: remove old CALL_ON_STACK() macro
  s390/softirq: use call_on_stack() macro
  s390/lib: use call_on_stack() macro
  s390/smp: use call_on_stack() macro
  s390/kexec: use call_on_stack() macro
  s390/irq: use call_on_stack() macro
  s390/mm: use call_on_stack() macro
  s390: introduce proper type handling call_on_stack() macro
  s390/irq: simplify on_async_stack()
  s390/irq: inline do_softirq_own_stack()
  s390/irq: simplify do_softirq_own_stack()
  s390/ap: get rid of register asm in ap_dqap()
  s390: rename PIF_SYSCALL_RESTART to PIF_EXECVE_PGSTE_RESTART
  s390: move restart of execve() syscall
  s390/signal: remove sigreturn on stack
  s390/signal: switch to using vdso for sigreturn and syscall restart
  ...

arch/s390/Kconfig

@@ -163,7 +163,6 @@ config S390
 	select HAVE_GCC_PLUGINS
 	select HAVE_GENERIC_VDSO
 	select HAVE_IOREMAP_PROT if PCI
-	select HAVE_IRQ_EXIT_ON_IRQ_STACK
 	select HAVE_KERNEL_BZIP2
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_LZ4
@@ -438,6 +437,7 @@ config COMPAT
 	select COMPAT_OLD_SIGACTION
 	select HAVE_UID16
 	depends on MULTIUSER
+	depends on !CC_IS_CLANG
 	help
 	  Select this option if you want to enable your system kernel to
 	  handle system-calls from ELF binaries for 31 bit ESA.  This option

arch/s390/Makefile

@@ -166,6 +166,19 @@ archheaders:
 archprepare:
 	$(Q)$(MAKE) $(build)=$(syscalls) kapi
 	$(Q)$(MAKE) $(build)=$(tools) kapi
+ifeq ($(KBUILD_EXTMOD),)
+# We need to generate vdso-offsets.h before compiling certain files in kernel/.
+# In order to do that, we should use the archprepare target, but we can't since
+# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
+# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
+# Therefore we need to generate the header after prepare0 has been made, hence
+# this hack.
+prepare: vdso_prepare
+vdso_prepare: prepare0
+	$(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h
+	$(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
+		$(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)
+endif
 
 # Don't use tabs in echo arguments
 define archhelp

arch/s390/boot/startup.c

@@ -23,6 +23,7 @@ unsigned long __bootdata_preserved(vmemmap_size);
 unsigned long __bootdata_preserved(MODULES_VADDR);
 unsigned long __bootdata_preserved(MODULES_END);
 unsigned long __bootdata(ident_map_size);
+int __bootdata(is_full_image) = 1;
 
 u64 __bootdata_preserved(stfle_fac_list[16]);
 u64 __bootdata_preserved(alt_stfle_fac_list[16]);

arch/s390/boot/uv.c

@@ -36,6 +36,7 @@ void uv_query_info(void)
 		uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE);
 		uv_info.max_num_sec_conf = uvcb.max_num_sec_conf;
 		uv_info.max_guest_cpu_id = uvcb.max_guest_cpu_id;
+		uv_info.uv_feature_indications = uvcb.uv_feature_indications;
 	}
 
 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST

arch/s390/include/asm/cpu_mcf.h

@@ -32,39 +32,22 @@ static const u64 cpumf_ctr_ctl[CPUMF_CTR_SET_MAX] = {
 	[CPUMF_CTR_SET_MT_DIAG] = 0x20,
 };
 
-static inline void ctr_set_enable(u64 *state, int ctr_set)
-{
-	*state |= cpumf_ctr_ctl[ctr_set] << CPUMF_LCCTL_ENABLE_SHIFT;
-}
-static inline void ctr_set_disable(u64 *state, int ctr_set)
-{
-	*state &= ~(cpumf_ctr_ctl[ctr_set] << CPUMF_LCCTL_ENABLE_SHIFT);
-}
-static inline void ctr_set_start(u64 *state, int ctr_set)
-{
-	*state |= cpumf_ctr_ctl[ctr_set] << CPUMF_LCCTL_ACTCTL_SHIFT;
-}
-static inline void ctr_set_stop(u64 *state, int ctr_set)
-{
-	*state &= ~(cpumf_ctr_ctl[ctr_set] << CPUMF_LCCTL_ACTCTL_SHIFT);
-}
-
-static inline void ctr_set_multiple_enable(u64 *state, u64 ctrsets)
+static inline void ctr_set_enable(u64 *state, u64 ctrsets)
 {
 	*state |= ctrsets << CPUMF_LCCTL_ENABLE_SHIFT;
 }
 
-static inline void ctr_set_multiple_disable(u64 *state, u64 ctrsets)
+static inline void ctr_set_disable(u64 *state, u64 ctrsets)
 {
 	*state &= ~(ctrsets << CPUMF_LCCTL_ENABLE_SHIFT);
 }
 
-static inline void ctr_set_multiple_start(u64 *state, u64 ctrsets)
+static inline void ctr_set_start(u64 *state, u64 ctrsets)
 {
 	*state |= ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT;
 }
 
-static inline void ctr_set_multiple_stop(u64 *state, u64 ctrsets)
+static inline void ctr_set_stop(u64 *state, u64 ctrsets)
 {
 	*state &= ~(ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT);
 }
@@ -92,8 +75,15 @@ struct cpu_cf_events {
 	struct cpumf_ctr_info	info;
 	atomic_t		ctr_set[CPUMF_CTR_SET_MAX];
 	atomic64_t		alert;
-	u64			state;
+	u64			state;		/* For perf_event_open SVC */
+	u64			dev_state;	/* For /dev/hwctr */
 	unsigned int		flags;
+	size_t used;			/* Bytes used in data */
+	size_t usedss;			/* Bytes used in start/stop */
+	unsigned char start[PAGE_SIZE];	/* Counter set at event add */
+	unsigned char stop[PAGE_SIZE];	/* Counter set at event delete */
+	unsigned char data[PAGE_SIZE];	/* Counter set at /dev/hwctr */
+	unsigned int sets;		/* # Counter set saved in memory */
 };
 DECLARE_PER_CPU(struct cpu_cf_events, cpu_cf_events);
 
@@ -124,4 +114,6 @@ static inline int stccm_avail(void)
 
 size_t cpum_cf_ctrset_size(enum cpumf_ctr_set ctrset,
 			   struct cpumf_ctr_info *info);
+int cfset_online_cpu(unsigned int cpu);
+int cfset_offline_cpu(unsigned int cpu);
 #endif /* _ASM_S390_CPU_MCF_H */

arch/s390/include/asm/ctl_reg.h

@@ -21,8 +21,6 @@
 #define CR0_INTERRUPT_KEY_SUBMASK	BIT(63 - 57)
 #define CR0_MEASUREMENT_ALERT_SUBMASK	BIT(63 - 58)
 
-#define CR2_GUARDED_STORAGE		BIT(63 - 59)
-
 #define CR14_UNUSED_32			BIT(63 - 32)
 #define CR14_UNUSED_33			BIT(63 - 33)
 #define CR14_CHANNEL_REPORT_SUBMASK	BIT(63 - 35)

arch/s390/include/asm/elf.h

@@ -144,10 +144,6 @@ typedef s390_compat_regs compat_elf_gregset_t;
 #include <linux/sched/mm.h>	/* for task_struct */
 #include <asm/mmu_context.h>
 
-#include <asm/vdso.h>
-
-extern unsigned int vdso_enabled;
-
 /*
  * This is used to ensure we don't load something for the wrong architecture.
  */
@@ -176,7 +172,7 @@ struct arch_elf_state {
 	    !current->mm->context.alloc_pgste) {		\
 		set_thread_flag(TIF_PGSTE);			\
 		set_pt_regs_flag(task_pt_regs(current),		\
-				 PIF_SYSCALL_RESTART);		\
+				 PIF_EXECVE_PGSTE_RESTART);	\
 		_state->rc = -EAGAIN;				\
 	}							\
 	_state->rc;						\
@@ -270,7 +266,6 @@ do {								\
 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 #define ARCH_DLINFO							\
 do {									\
-	if (vdso_enabled)						    \
 	NEW_AUX_ENT(AT_SYSINFO_EHDR,					\
 		    (unsigned long)current->mm->context.vdso_base);	\
 } while (0)

arch/s390/include/asm/entry-common.h

@@ -14,7 +14,6 @@
 #define ARCH_EXIT_TO_USER_MODE_WORK (_TIF_GUARDED_STORAGE | _TIF_PER_TRAP)
 
 void do_per_trap(struct pt_regs *regs);
-void do_syscall(struct pt_regs *regs);
 
 #ifdef CONFIG_DEBUG_ENTRY
 static __always_inline void arch_check_user_regs(struct pt_regs *regs)

arch/s390/include/asm/linkage.h

@@ -5,7 +5,7 @@
 #include <asm/asm-const.h>
 #include <linux/stringify.h>
 
-#define __ALIGN .align 4, 0x07
+#define __ALIGN .align 16, 0x07
 #define __ALIGN_STR __stringify(__ALIGN)
 
 /*

arch/s390/include/asm/nmi.h

@@ -23,12 +23,16 @@
 #define MCCK_CODE_SYSTEM_DAMAGE		BIT(63)
 #define MCCK_CODE_EXT_DAMAGE		BIT(63 - 5)
 #define MCCK_CODE_CP			BIT(63 - 9)
-#define MCCK_CODE_CPU_TIMER_VALID	BIT(63 - 46)
+#define MCCK_CODE_STG_ERROR		BIT(63 - 16)
+#define MCCK_CODE_STG_KEY_ERROR		BIT(63 - 18)
+#define MCCK_CODE_STG_DEGRAD		BIT(63 - 19)
 #define MCCK_CODE_PSW_MWP_VALID		BIT(63 - 20)
 #define MCCK_CODE_PSW_IA_VALID		BIT(63 - 23)
+#define MCCK_CODE_STG_FAIL_ADDR		BIT(63 - 24)
 #define MCCK_CODE_CR_VALID		BIT(63 - 29)
 #define MCCK_CODE_GS_VALID		BIT(63 - 36)
 #define MCCK_CODE_FC_VALID		BIT(63 - 43)
+#define MCCK_CODE_CPU_TIMER_VALID	BIT(63 - 46)
 
 #ifndef __ASSEMBLY__
 

arch/s390/include/asm/preempt.h

@@ -29,12 +29,6 @@ static inline void preempt_count_set(int pc)
 				  old, new) != old);
 }
 
-#define init_task_preempt_count(p)	do { } while (0)
-
-#define init_idle_preempt_count(p, cpu)	do { \
-	S390_lowcore.preempt_count = PREEMPT_DISABLED; \
-} while (0)
-
 static inline void set_preempt_need_resched(void)
 {
 	__atomic_and(~PREEMPT_NEED_RESCHED, &S390_lowcore.preempt_count);
@@ -88,12 +82,6 @@ static inline void preempt_count_set(int pc)
 	S390_lowcore.preempt_count = pc;
 }
 
-#define init_task_preempt_count(p)	do { } while (0)
-
-#define init_idle_preempt_count(p, cpu)	do { \
-	S390_lowcore.preempt_count = PREEMPT_DISABLED; \
-} while (0)
-
 static inline void set_preempt_need_resched(void)
 {
 }
@@ -130,6 +118,10 @@ static inline bool should_resched(int preempt_offset)
 
 #endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */
 
+#define init_task_preempt_count(p)	do { } while (0)
+/* Deferred to CPU bringup time */
+#define init_idle_preempt_count(p, cpu)	do { } while (0)
+
 #ifdef CONFIG_PREEMPTION
 extern void preempt_schedule(void);
 #define __preempt_schedule() preempt_schedule()

arch/s390/include/asm/ptrace.h

@@ -12,12 +12,12 @@
 #include <asm/tpi.h>
 
 #define PIF_SYSCALL			0	/* inside a system call */
-#define PIF_SYSCALL_RESTART	1	/* restart the current system call */
+#define PIF_EXECVE_PGSTE_RESTART	1	/* restart execve for PGSTE binaries */
 #define PIF_SYSCALL_RET_SET		2	/* return value was set via ptrace */
 #define PIF_GUEST_FAULT			3	/* indicates program check in sie64a */
 
 #define _PIF_SYSCALL			BIT(PIF_SYSCALL)
-#define _PIF_SYSCALL_RESTART	BIT(PIF_SYSCALL_RESTART)
+#define _PIF_EXECVE_PGSTE_RESTART	BIT(PIF_EXECVE_PGSTE_RESTART)
 #define _PIF_SYSCALL_RET_SET		BIT(PIF_SYSCALL_RET_SET)
 #define _PIF_GUEST_FAULT		BIT(PIF_GUEST_FAULT)
 
@@ -162,6 +162,14 @@ static inline int test_pt_regs_flag(struct pt_regs *regs, int flag)
 	return !!(regs->flags & (1UL << flag));
 }
 
+static inline int test_and_clear_pt_regs_flag(struct pt_regs *regs, int flag)
+{
+	int ret = test_pt_regs_flag(regs, flag);
+
+	clear_pt_regs_flag(regs, flag);
+	return ret;
+}
+
 /*
  * These are defined as per linux/ptrace.h, which see.
  */

arch/s390/include/asm/setup.h

@@ -159,6 +159,8 @@ static inline unsigned long kaslr_offset(void)
 	return __kaslr_offset;
 }
 
+extern int is_full_image;
+
 static inline u32 gen_lpswe(unsigned long addr)
 {
 	BUILD_BUG_ON(addr > 0xfff);

arch/s390/include/asm/softirq_stack.h

+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef __ASM_S390_SOFTIRQ_STACK_H
+#define __ASM_S390_SOFTIRQ_STACK_H
+
+#include <asm/lowcore.h>
+#include <asm/stacktrace.h>
+
+static inline void do_softirq_own_stack(void)
+{
+	call_on_stack(0, S390_lowcore.async_stack, void, __do_softirq);
+}
+
+#endif /* __ASM_S390_SOFTIRQ_STACK_H */

arch/s390/include/asm/stacktrace.h

@@ -74,23 +74,6 @@ struct stack_frame {
 	((unsigned long)__builtin_frame_address(0) -			\
 	 offsetof(struct stack_frame, back_chain))
 
-#define CALL_ARGS_0()							\
-	register unsigned long r2 asm("2")
-#define CALL_ARGS_1(arg1)						\
-	register unsigned long r2 asm("2") = (unsigned long)(arg1)
-#define CALL_ARGS_2(arg1, arg2)						\
-	CALL_ARGS_1(arg1);						\
-	register unsigned long r3 asm("3") = (unsigned long)(arg2)
-#define CALL_ARGS_3(arg1, arg2, arg3)					\
-	CALL_ARGS_2(arg1, arg2);					\
-	register unsigned long r4 asm("4") = (unsigned long)(arg3)
-#define CALL_ARGS_4(arg1, arg2, arg3, arg4)				\
-	CALL_ARGS_3(arg1, arg2, arg3);					\
-	register unsigned long r4 asm("5") = (unsigned long)(arg4)
-#define CALL_ARGS_5(arg1, arg2, arg3, arg4, arg5)			\
-	CALL_ARGS_4(arg1, arg2, arg3, arg4);				\
-	register unsigned long r4 asm("6") = (unsigned long)(arg5)
-
 /*
  * To keep this simple mark register 2-6 as being changed (volatile)
  * by the called function, even though register 6 is saved/nonvolatile.
@@ -109,34 +92,113 @@ struct stack_frame {
 #define CALL_CLOBBER_1 CALL_CLOBBER_2, "3"
 #define CALL_CLOBBER_0 CALL_CLOBBER_1
 
-#define CALL_ON_STACK(fn, stack, nr, args...)				\
+#define CALL_LARGS_0(...)						\
+	long dummy = 0
+#define CALL_LARGS_1(t1, a1)						\
+	long arg1  = (long)(t1)(a1)
+#define CALL_LARGS_2(t1, a1, t2, a2)					\
+	CALL_LARGS_1(t1, a1);						\
+	long arg2 = (long)(t2)(a2)
+#define CALL_LARGS_3(t1, a1, t2, a2, t3, a3)				\
+	CALL_LARGS_2(t1, a1, t2, a2);					\
+	long arg3 = (long)(t3)(a3)
+#define CALL_LARGS_4(t1, a1, t2, a2, t3, a3, t4, a4)			\
+	CALL_LARGS_3(t1, a1, t2, a2, t3, a3);				\
+	long arg4  = (long)(t4)(a4)
+#define CALL_LARGS_5(t1, a1, t2, a2, t3, a3, t4, a4, t5, a5)		\
+	CALL_LARGS_4(t1, a1, t2, a2, t3, a3, t4, a4);			\
+	long arg5 = (long)(t5)(a5)
+
+#define CALL_REGS_0							\
+	register long r2 asm("2") = dummy
+#define CALL_REGS_1							\
+	register long r2 asm("2") = arg1
+#define CALL_REGS_2							\
+	CALL_REGS_1;							\
+	register long r3 asm("3") = arg2
+#define CALL_REGS_3							\
+	CALL_REGS_2;							\
+	register long r4 asm("4") = arg3
+#define CALL_REGS_4							\
+	CALL_REGS_3;							\
+	register long r5 asm("5") = arg4
+#define CALL_REGS_5							\
+	CALL_REGS_4;							\
+	register long r6 asm("6") = arg5
+
+#define CALL_TYPECHECK_0(...)
+#define CALL_TYPECHECK_1(t, a, ...)					\
+	typecheck(t, a)
+#define CALL_TYPECHECK_2(t, a, ...)					\
+	CALL_TYPECHECK_1(__VA_ARGS__);					\
+	typecheck(t, a)
+#define CALL_TYPECHECK_3(t, a, ...)					\
+	CALL_TYPECHECK_2(__VA_ARGS__);					\
+	typecheck(t, a)
+#define CALL_TYPECHECK_4(t, a, ...)					\
+	CALL_TYPECHECK_3(__VA_ARGS__);					\
+	typecheck(t, a)
+#define CALL_TYPECHECK_5(t, a, ...)					\
+	CALL_TYPECHECK_4(__VA_ARGS__);					\
+	typecheck(t, a)
+
+#define CALL_PARM_0(...) void
+#define CALL_PARM_1(t, a, ...) t
+#define CALL_PARM_2(t, a, ...) t, CALL_PARM_1(__VA_ARGS__)
+#define CALL_PARM_3(t, a, ...) t, CALL_PARM_2(__VA_ARGS__)
+#define CALL_PARM_4(t, a, ...) t, CALL_PARM_3(__VA_ARGS__)
+#define CALL_PARM_5(t, a, ...) t, CALL_PARM_4(__VA_ARGS__)
+#define CALL_PARM_6(t, a, ...) t, CALL_PARM_5(__VA_ARGS__)
+
+/*
+ * Use call_on_stack() to call a function switching to a specified
+ * stack. Proper sign and zero extension of function arguments is
+ * done. Usage:
+ *
+ * rc = call_on_stack(nr, stack, rettype, fn, t1, a1, t2, a2, ...)
+ *
+ * - nr specifies the number of function arguments of fn.
+ * - stack specifies the stack to be used.
+ * - fn is the function to be called.
+ * - rettype is the return type of fn.
+ * - t1, a1, ... are pairs, where t1 must match the type of the first
+ *   argument of fn, t2 the second, etc. a1 is the corresponding
+ *   first function argument (not name), etc.
+ */
+#define call_on_stack(nr, stack, rettype, fn, ...)			\
 ({									\
+	rettype (*__fn)(CALL_PARM_##nr(__VA_ARGS__)) = fn;		\
 	unsigned long frame = current_frame_address();			\
-	CALL_ARGS_##nr(args);						\
+	unsigned long __stack = stack;					\
 	unsigned long prev;						\
+	CALL_LARGS_##nr(__VA_ARGS__);					\
+	CALL_REGS_##nr;							\
 									\
+	CALL_TYPECHECK_##nr(__VA_ARGS__);				\
 	asm volatile(							\
-		"	la	%[_prev],0(15)\n"			\
+		"	lgr	%[_prev],15\n"				\
 		"	lg	15,%[_stack]\n"				\
 		"	stg	%[_frame],%[_bc](15)\n"			\
 		"	brasl	14,%[_fn]\n"				\
-		"	la	15,0(%[_prev])\n"			\
-		: [_prev] "=&a" (prev), CALL_FMT_##nr			\
-		: [_stack] "R" (stack),					\
+		"	lgr	15,%[_prev]\n"				\
+		: [_prev] "=&d" (prev), CALL_FMT_##nr			\
+		: [_stack] "R" (__stack),				\
 		  [_bc] "i" (offsetof(struct stack_frame, back_chain)),	\
 		  [_frame] "d" (frame),					\
-		  [_fn] "X" (fn) : CALL_CLOBBER_##nr);			\
-	r2;								\
+		  [_fn] "X" (__fn) : CALL_CLOBBER_##nr);		\
+	(rettype)r2;							\
 })
 
-#define CALL_ON_STACK_NORETURN(fn, stack)				\
+#define call_on_stack_noreturn(fn, stack)				\
 ({									\
+	void (*__fn)(void) = fn;					\
+									\
 	asm volatile(							\
 		"	la	15,0(%[_stack])\n"			\
 		"	xc	%[_bc](8,15),%[_bc](15)\n"		\
 		"	brasl	14,%[_fn]\n"				\
 		::[_bc] "i" (offsetof(struct stack_frame, back_chain)),	\
-		  [_stack] "a" (stack), [_fn] "X" (fn));		\
+		  [_stack] "a" (stack), [_fn] "X" (__fn));		\
 	BUG();								\
 })
 

arch/s390/include/asm/uv.h

@@ -73,6 +73,10 @@ enum uv_cmds_inst {
 	BIT_UVC_CMD_UNPIN_PAGE_SHARED = 22,
 };
 
+enum uv_feat_ind {
+	BIT_UV_FEAT_MISC = 0,
+};
+
 struct uv_cb_header {
 	u16 len;
 	u16 cmd;	/* Command Code */
@@ -97,7 +101,8 @@ struct uv_cb_qui {
 	u64 max_guest_stor_addr;
 	u8  reserved88[158 - 136];
 	u16 max_guest_cpu_id;
-	u8  reserveda0[200 - 160];
+	u64 uv_feature_indications;
+	u8  reserveda0[200 - 168];
 } __packed __aligned(8);
 
 /* Initialize Ultravisor */
@@ -274,6 +279,7 @@ struct uv_info {
 	unsigned long max_sec_stor_addr;
 	unsigned int max_num_sec_conf;
 	unsigned short max_guest_cpu_id;
+	unsigned long uv_feature_indications;
 };
 
 extern struct uv_info uv_info;

arch/s390/include/asm/vdso.h

@@ -4,18 +4,31 @@
 
 #include <vdso/datapage.h>
 
-/* Default link address for the vDSO */
-#define VDSO64_LBASE	0
+#ifndef __ASSEMBLY__
 
-#define __VVAR_PAGES	2
+#include <generated/vdso64-offsets.h>
+#ifdef CONFIG_COMPAT
+#include <generated/vdso32-offsets.h>
+#endif
 
-#define VDSO_VERSION_STRING	LINUX_2.6.29
-
-#ifndef __ASSEMBLY__
+#define VDSO64_SYMBOL(tsk, name) ((tsk)->mm->context.vdso_base + (vdso64_offset_##name))
+#ifdef CONFIG_COMPAT
+#define VDSO32_SYMBOL(tsk, name) ((tsk)->mm->context.vdso_base + (vdso32_offset_##name))
+#else
+#define VDSO32_SYMBOL(tsk, name) (-1UL)
+#endif
 
 extern struct vdso_data *vdso_data;
 
 int vdso_getcpu_init(void);
 
 #endif /* __ASSEMBLY__ */
+
+/* Default link address for the vDSO */
+#define VDSO_LBASE	0
+
+#define __VVAR_PAGES	2
+
+#define VDSO_VERSION_STRING	LINUX_2.6.29
+
 #endif /* __S390_VDSO_H__ */

arch/s390/include/asm/vdso/gettimeofday.h

@@ -8,7 +8,6 @@
 
 #include <asm/timex.h>
 #include <asm/unistd.h>
-#include <asm/vdso.h>
 #include <linux/compiler.h>
 
 #define vdso_calc_delta __arch_vdso_calc_delta

arch/s390/kernel/Makefile

@@ -71,10 +71,10 @@ obj-$(CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT)	+= ima_arch.o
 obj-$(CONFIG_PERF_EVENTS)	+= perf_event.o perf_cpum_cf_common.o
 obj-$(CONFIG_PERF_EVENTS)	+= perf_cpum_cf.o perf_cpum_sf.o
 obj-$(CONFIG_PERF_EVENTS)	+= perf_cpum_cf_events.o perf_regs.o
-obj-$(CONFIG_PERF_EVENTS)	+= perf_cpum_cf_diag.o
 
 obj-$(CONFIG_TRACEPOINTS)	+= trace.o
 obj-$(findstring y, $(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) $(CONFIG_PGSTE))	+= uv.o
 
 # vdso
 obj-y				+= vdso64/
+obj-$(CONFIG_COMPAT)		+= vdso32/

arch/s390/kernel/asm-offsets.c

@@ -14,8 +14,6 @@
 #include <linux/pgtable.h>
 #include <asm/idle.h>
 #include <asm/gmap.h>
-#include <asm/nmi.h>
-#include <asm/setup.h>
 #include <asm/stacktrace.h>
 
 int main(void)
@@ -108,7 +106,6 @@ int main(void)
 	OFFSET(__LC_LAST_UPDATE_CLOCK, lowcore, last_update_clock);
 	OFFSET(__LC_INT_CLOCK, lowcore, int_clock);
 	OFFSET(__LC_MCCK_CLOCK, lowcore, mcck_clock);
-	OFFSET(__LC_CLOCK_COMPARATOR, lowcore, clock_comparator);
 	OFFSET(__LC_BOOT_CLOCK, lowcore, boot_clock);
 	OFFSET(__LC_CURRENT, lowcore, current_task);
 	OFFSET(__LC_KERNEL_STACK, lowcore, kernel_stack);
@@ -145,9 +142,6 @@ int main(void)
 	OFFSET(__LC_CREGS_SAVE_AREA, lowcore, cregs_save_area);
 	OFFSET(__LC_PGM_TDB, lowcore, pgm_tdb);
 	BLANK();
-	/* extended machine check save area */
-	OFFSET(__MCESA_GS_SAVE_AREA, mcesa, guarded_storage_save_area);
-	BLANK();
 	/* gmap/sie offsets */
 	OFFSET(__GMAP_ASCE, gmap, asce);
 	OFFSET(__SIE_PROG0C, kvm_s390_sie_block, prog0c);

arch/s390/kernel/compat_signal.c

@@ -28,6 +28,7 @@
 #include <linux/uaccess.h>
 #include <asm/lowcore.h>
 #include <asm/switch_to.h>
+#include <asm/vdso.h>
 #include "compat_linux.h"
 #include "compat_ptrace.h"
 #include "entry.h"
@@ -118,7 +119,6 @@ static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
 	fpregs_load((_s390_fp_regs *) &user_sregs.fpregs, &current->thread.fpu);
 
 	clear_pt_regs_flag(regs, PIF_SYSCALL); /* No longer in a system call */
-	clear_pt_regs_flag(regs, PIF_SYSCALL_RESTART);
 	return 0;
 }
 
@@ -304,11 +304,7 @@ static int setup_frame32(struct ksignal *ksig, sigset_t *set,
 		restorer = (unsigned long __force)
 			ksig->ka.sa.sa_restorer | PSW32_ADDR_AMODE;
 	} else {
-		/* Signal frames without vectors registers are short ! */
-		__u16 __user *svc = (void __user *) frame + frame_size - 2;
-		if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, svc))
-			return -EFAULT;
-		restorer = (unsigned long __force) svc | PSW32_ADDR_AMODE;
+		restorer = VDSO32_SYMBOL(current, sigreturn);
         }
 
 	/* Set up registers for signal handler */
@@ -371,10 +367,7 @@ static int setup_rt_frame32(struct ksignal *ksig, sigset_t *set,
 		restorer = (unsigned long __force)
 			ksig->ka.sa.sa_restorer | PSW32_ADDR_AMODE;
 	} else {
-		__u16 __user *svc = &frame->svc_insn;
-		if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, svc))
-			return -EFAULT;
-		restorer = (unsigned long __force) svc | PSW32_ADDR_AMODE;
+		restorer = VDSO32_SYMBOL(current, rt_sigreturn);
 	}
 
 	/* Create siginfo on the signal stack */

arch/s390/kernel/early.c

@@ -33,6 +33,8 @@
 #include <asm/switch_to.h>
 #include "entry.h"
 
+int __bootdata(is_full_image);
+
 static void __init reset_tod_clock(void)
 {
 	union tod_clock clk;
@@ -279,7 +281,7 @@ static void __init setup_boot_command_line(void)
 
 static void __init check_image_bootable(void)
 {
-	if (!memcmp(EP_STRING, (void *)EP_OFFSET, strlen(EP_STRING)))
+	if (is_full_image)
 		return;
 
 	sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n");

arch/s390/kernel/entry.S

@@ -14,7 +14,6 @@
 #include <asm/alternative-asm.h>
 #include <asm/processor.h>
 #include <asm/cache.h>
-#include <asm/ctl_reg.h>
 #include <asm/dwarf.h>
 #include <asm/errno.h>
 #include <asm/ptrace.h>
@@ -129,6 +128,24 @@ _LPP_OFFSET	= __LC_LPP
 		    "jnz .+8; .long 0xb2e8d000", 82
 	.endm
 
+	/*
+	 * The CHKSTG macro jumps to the provided label in case the
+	 * machine check interruption code reports one of unrecoverable
+	 * storage errors:
+	 * - Storage error uncorrected
+	 * - Storage key error uncorrected
+	 * - Storage degradation with Failing-storage-address validity
+	 */
+	.macro CHKSTG errlabel
+	TSTMSK	__LC_MCCK_CODE,(MCCK_CODE_STG_ERROR|MCCK_CODE_STG_KEY_ERROR)
+	jnz	\errlabel
+	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_STG_DEGRAD
+	jz	oklabel\@
+	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_STG_FAIL_ADDR
+	jnz	\errlabel
+oklabel\@:
+	.endm
+
 #if IS_ENABLED(CONFIG_KVM)
 	/*
 	 * The OUTSIDE macro jumps to the provided label in case the value
@@ -148,6 +165,13 @@ _LPP_OFFSET	= __LC_LPP
 	clgr	%r14,%r13
 	jhe	\outside_label
 	.endm
+
+	.macro SIEEXIT
+	lg	%r9,__SF_SIE_CONTROL(%r15)	# get control block pointer
+	ni	__SIE_PROG0C+3(%r9),0xfe	# no longer in SIE
+	lctlg	%c1,%c1,__LC_KERNEL_ASCE	# load primary asce
+	larl	%r9,sie_exit			# skip forward to sie_exit
+	.endm
 #endif
 
 	GEN_BR_THUNK %r14
@@ -235,7 +259,6 @@ ENTRY(sie64a)
 # are some corner cases (e.g. runtime instrumentation) where ILC is unpredictable.
 # Other instructions between sie64a and .Lsie_done should not cause program
 # interrupts. So lets use 3 nops as a landing pad for all possible rewinds.
-# See also .Lcleanup_sie
 .Lrewind_pad6:
 	nopr	7
 .Lrewind_pad4:
@@ -341,10 +364,7 @@ ENTRY(pgm_check_handler)
 #if IS_ENABLED(CONFIG_KVM)
 	# cleanup critical section for program checks in sie64a
 	OUTSIDE	%r9,.Lsie_gmap,.Lsie_done,1f
-	lg	%r14,__SF_SIE_CONTROL(%r15)	# get control block pointer
-	ni	__SIE_PROG0C+3(%r14),0xfe	# no longer in SIE
-	lctlg	%c1,%c1,__LC_KERNEL_ASCE	# load primary asce
-	larl	%r9,sie_exit			# skip forward to sie_exit
+	SIEEXIT
 	lghi	%r10,_PIF_GUEST_FAULT
 #endif
 1:	tmhh	%r8,0x4000		# PER bit set in old PSW ?
@@ -410,7 +430,8 @@ ENTRY(\name)
 	jnz	1f
 #if IS_ENABLED(CONFIG_KVM)
 	OUTSIDE	%r9,.Lsie_gmap,.Lsie_done,0f
-	brasl	%r14,.Lcleanup_sie
+	BPENTER	__SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)
+	SIEEXIT
 #endif
 0:	CHECK_STACK __LC_SAVE_AREA_ASYNC
 	aghi	%r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
@@ -484,8 +505,6 @@ ENTRY(mcck_int_handler)
 	BPOFF
 	la	%r1,4095		# validate r1
 	spt	__LC_CPU_TIMER_SAVE_AREA-4095(%r1)	# validate cpu timer
-	sckc	__LC_CLOCK_COMPARATOR			# validate comparator
-	lam	%a0,%a15,__LC_AREGS_SAVE_AREA-4095(%r1) # validate acrs
 	lmg	%r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# validate gprs
 	lg	%r12,__LC_CURRENT
 	lmg	%r8,%r9,__LC_MCK_OLD_PSW
@@ -496,41 +515,7 @@ ENTRY(mcck_int_handler)
 	la	%r14,4095
 	lctlg	%c0,%c15,__LC_CREGS_SAVE_AREA-4095(%r14) # validate ctl regs
 	ptlb
-	lg	%r11,__LC_MCESAD-4095(%r14) # extended machine check save area
-	nill	%r11,0xfc00		# MCESA_ORIGIN_MASK
-	TSTMSK	__LC_CREGS_SAVE_AREA+16-4095(%r14),CR2_GUARDED_STORAGE
-	jno	0f
-	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_GS_VALID
-	jno	0f
-	.insn	 rxy,0xe3000000004d,0,__MCESA_GS_SAVE_AREA(%r11) # LGSC
-0:	l	%r14,__LC_FP_CREG_SAVE_AREA-4095(%r14)
-	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_FC_VALID
-	jo	0f
-	sr	%r14,%r14
-0:	sfpc	%r14
-	TSTMSK	__LC_MACHINE_FLAGS,MACHINE_FLAG_VX
-	jo	0f
-	lghi	%r14,__LC_FPREGS_SAVE_AREA
-	ld	%f0,0(%r14)
-	ld	%f1,8(%r14)
-	ld	%f2,16(%r14)
-	ld	%f3,24(%r14)
-	ld	%f4,32(%r14)
-	ld	%f5,40(%r14)
-	ld	%f6,48(%r14)
-	ld	%f7,56(%r14)
-	ld	%f8,64(%r14)
-	ld	%f9,72(%r14)
-	ld	%f10,80(%r14)
-	ld	%f11,88(%r14)
-	ld	%f12,96(%r14)
-	ld	%f13,104(%r14)
-	ld	%f14,112(%r14)
-	ld	%f15,120(%r14)
-	j	1f
-0:	VLM	%v0,%v15,0,%r11
-	VLM	%v16,%v31,256,%r11
-1:	lghi	%r14,__LC_CPU_TIMER_SAVE_AREA
+	lghi	%r14,__LC_CPU_TIMER_SAVE_AREA
 	mvc	__LC_MCCK_ENTER_TIMER(8),0(%r14)
 	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_CPU_TIMER_VALID
 	jo	3f
@@ -546,24 +531,29 @@ ENTRY(mcck_int_handler)
 3:	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_PSW_MWP_VALID
 	jno	.Lmcck_panic
 	tmhh	%r8,0x0001		# interrupting from user ?
-	jnz	4f
+	jnz	6f
 	TSTMSK	__LC_MCCK_CODE,MCCK_CODE_PSW_IA_VALID
 	jno	.Lmcck_panic
-4:	ssm	__LC_PGM_NEW_PSW	# turn dat on, keep irqs off
-	tmhh	%r8,0x0001			# interrupting from user ?
-	jnz	.Lmcck_user
 #if IS_ENABLED(CONFIG_KVM)
-	OUTSIDE	%r9,.Lsie_gmap,.Lsie_done,.Lmcck_stack
-	OUTSIDE	%r9,.Lsie_entry,.Lsie_skip,5f
+	OUTSIDE	%r9,.Lsie_gmap,.Lsie_done,6f
+	OUTSIDE	%r9,.Lsie_entry,.Lsie_skip,4f
 	oi	__LC_CPU_FLAGS+7, _CIF_MCCK_GUEST
-5:	brasl	%r14,.Lcleanup_sie
-#endif
+	j	5f
+4:	CHKSTG	.Lmcck_panic
+5:	larl	%r14,.Lstosm_tmp
+	stosm	0(%r14),0x04		# turn dat on, keep irqs off
+	BPENTER	__SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)
+	SIEEXIT
 	j	.Lmcck_stack
-.Lmcck_user:
+#endif
+6:	CHKSTG	.Lmcck_panic
+	larl	%r14,.Lstosm_tmp
+	stosm	0(%r14),0x04		# turn dat on, keep irqs off
+	tmhh	%r8,0x0001		# interrupting from user ?
+	jz	.Lmcck_stack
 	BPENTER __TI_flags(%r12),_TIF_ISOLATE_BP
 .Lmcck_stack:
 	lg	%r15,__LC_MCCK_STACK
-.Lmcck_skip:
 	la	%r11,STACK_FRAME_OVERHEAD(%r15)
 	stctg	%c1,%c1,__PT_CR1(%r11)
 	lctlg	%c1,%c1,__LC_KERNEL_ASCE
@@ -605,8 +595,33 @@ ENTRY(mcck_int_handler)
 	b	__LC_RETURN_MCCK_LPSWE
 
 .Lmcck_panic:
-	lg	%r15,__LC_NODAT_STACK
-	j	.Lmcck_skip
+	/*
+	 * Iterate over all possible CPU addresses in the range 0..0xffff
+	 * and stop each CPU using signal processor. Use compare and swap
+	 * to allow just one CPU-stopper and prevent concurrent CPUs from
+	 * stopping each other while leaving the others running.
+	 */
+	lhi	%r5,0
+	lhi	%r6,1
+	larl	%r7,.Lstop_lock
+	cs	%r5,%r6,0(%r7)		# single CPU-stopper only
+	jnz	4f
+	larl	%r7,.Lthis_cpu
+	stap	0(%r7)			# this CPU address
+	lh	%r4,0(%r7)
+	nilh	%r4,0
+	lhi	%r0,1
+	sll	%r0,16			# CPU counter
+	lhi	%r3,0			# next CPU address
+0:	cr	%r3,%r4
+	je	2f
+1:	sigp	%r1,%r3,SIGP_STOP	# stop next CPU
+	brc	SIGP_CC_BUSY,1b
+2:	ahi	%r3,1
+	brct	%r0,0b
+3:	sigp	%r1,%r4,SIGP_STOP	# stop this CPU
+	brc	SIGP_CC_BUSY,3b
+4:	j	4b
 ENDPROC(mcck_int_handler)
 
 #
@@ -657,15 +672,11 @@ ENTRY(stack_overflow)
 ENDPROC(stack_overflow)
 #endif
 
-#if IS_ENABLED(CONFIG_KVM)
-.Lcleanup_sie:
-	BPENTER	__SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)
-	lg	%r9,__SF_SIE_CONTROL(%r15)	# get control block pointer
-	ni	__SIE_PROG0C+3(%r9),0xfe	# no longer in SIE
-	lctlg	%c1,%c1,__LC_KERNEL_ASCE
-	larl	%r9,sie_exit			# skip forward to sie_exit
-	BR_EX	%r14,%r13
-#endif
+	.section .data, "aw"
+		.align	4
+.Lstop_lock:	.long	0
+.Lthis_cpu:	.short	0
+.Lstosm_tmp:	.byte	0
 	.section .rodata, "a"
 #define SYSCALL(esame,emu)	.quad __s390x_ ## esame
 	.globl	sys_call_table

arch/s390/kernel/irq.c

@@ -110,15 +110,17 @@ static int on_async_stack(void)
 {
 	unsigned long frame = current_frame_address();
 
-	return !!!((S390_lowcore.async_stack - frame) >> (PAGE_SHIFT + THREAD_SIZE_ORDER));
+	return ((S390_lowcore.async_stack ^ frame) & ~(THREAD_SIZE - 1)) == 0;
 }
 
 static void do_irq_async(struct pt_regs *regs, int irq)
 {
-	if (on_async_stack())
+	if (on_async_stack()) {
 		do_IRQ(regs, irq);
-	else
-		CALL_ON_STACK(do_IRQ, S390_lowcore.async_stack, 2, regs, irq);
+	} else {
+		call_on_stack(2, S390_lowcore.async_stack, void, do_IRQ,
+			      struct pt_regs *, regs, int, irq);
+	}
 }
 
 static int irq_pending(struct pt_regs *regs)
@@ -265,24 +267,6 @@ unsigned int arch_dynirq_lower_bound(unsigned int from)
 	return from < NR_IRQS_BASE ? NR_IRQS_BASE : from;
 }
 
-/*
- * Switch to the asynchronous interrupt stack for softirq execution.
- */
-void do_softirq_own_stack(void)
-{
-	unsigned long old, new;
-
-	old = current_stack_pointer();
-	/* Check against async. stack address range. */
-	new = S390_lowcore.async_stack;
-	if (((new - old) >> (PAGE_SHIFT + THREAD_SIZE_ORDER)) != 0) {
-		CALL_ON_STACK(__do_softirq, new, 0);
-	} else {
-		/* We are already on the async stack. */
-		__do_softirq();
-	}
-}
-
 /*
  * ext_int_hash[index] is the list head for all external interrupts that hash
  * to this index.

arch/s390/kernel/kprobes.c

@@ -92,11 +92,6 @@ static void copy_instruction(struct kprobe *p)
 }
 NOKPROBE_SYMBOL(copy_instruction);
 
-static inline int is_kernel_addr(void *addr)
-{
-	return addr < (void *)_end;
-}
-
 static int s390_get_insn_slot(struct kprobe *p)
 {
 	/*
@@ -105,7 +100,7 @@ static int s390_get_insn_slot(struct kprobe *p)
 	 * field can be patched and executed within the insn slot.
 	 */
 	p->ainsn.insn = NULL;
-	if (is_kernel_addr(p->addr))
+	if (is_kernel((unsigned long)p->addr))
 		p->ainsn.insn = get_s390_insn_slot();
 	else if (is_module_addr(p->addr))
 		p->ainsn.insn = get_insn_slot();
@@ -117,7 +112,7 @@ static void s390_free_insn_slot(struct kprobe *p)
 {
 	if (!p->ainsn.insn)
 		return;
-	if (is_kernel_addr(p->addr))
+	if (is_kernel((unsigned long)p->addr))
 		free_s390_insn_slot(p->ainsn.insn, 0);
 	else
 		free_insn_slot(p->ainsn.insn, 0);

arch/s390/kernel/machine_kexec.c

@@ -132,7 +132,8 @@ static bool kdump_csum_valid(struct kimage *image)
 	int rc;
 
 	preempt_disable();
-	rc = CALL_ON_STACK(do_start_kdump, S390_lowcore.nodat_stack, 1, image);
+	rc = call_on_stack(1, S390_lowcore.nodat_stack, unsigned long, do_start_kdump,
+			   unsigned long, (unsigned long)image);
 	preempt_enable();
 	return rc == 0;
 #else

arch/s390/kernel/nmi.c

@@ -189,12 +189,16 @@ void noinstr s390_handle_mcck(void)
  * returns 0 if all required registers are available
  * returns 1 otherwise
  */
-static int notrace s390_check_registers(union mci mci, int umode)
+static int notrace s390_validate_registers(union mci mci, int umode)
 {
+	struct mcesa *mcesa;
+	void *fpt_save_area;
 	union ctlreg2 cr2;
 	int kill_task;
+	u64 zero;
 
 	kill_task = 0;
+	zero = 0;
 
 	if (!mci.gr) {
 		/*
@@ -205,14 +209,6 @@ static int notrace s390_check_registers(union mci mci, int umode)
 			s390_handle_damage();
 		kill_task = 1;
 	}
-	/* Check control registers */
-	if (!mci.cr) {
-		/*
-		 * Control registers have unknown contents.
-		 * Can't recover and therefore stopping machine.
-		 */
-		s390_handle_damage();
-	}
 	if (!mci.fp) {
 		/*
 		 * Floating point registers can't be restored. If the
@@ -225,35 +221,89 @@ static int notrace s390_check_registers(union mci mci, int umode)
 		if (!test_cpu_flag(CIF_FPU))
 			kill_task = 1;
 	}
+	fpt_save_area = &S390_lowcore.floating_pt_save_area;
 	if (!mci.fc) {
 		/*
 		 * Floating point control register can't be restored.
 		 * If the kernel currently uses the floating pointer
 		 * registers and needs the FPC register the system is
 		 * stopped. If the process has its floating pointer
-		 * registers loaded it is terminated.
+		 * registers loaded it is terminated. Otherwise the
+		 * FPC is just validated.
 		 */
 		if (S390_lowcore.fpu_flags & KERNEL_FPC)
 			s390_handle_damage();
+		asm volatile(
+			"	lfpc	%0\n"
+			:
+			: "Q" (zero));
 		if (!test_cpu_flag(CIF_FPU))
 			kill_task = 1;
+	} else {
+		asm volatile(
+			"	lfpc	%0\n"
+			:
+			: "Q" (S390_lowcore.fpt_creg_save_area));
 	}
 
-	if (MACHINE_HAS_VX) {
+	mcesa = (struct mcesa *)(S390_lowcore.mcesad & MCESA_ORIGIN_MASK);
+	if (!MACHINE_HAS_VX) {
+		/* Validate floating point registers */
+		asm volatile(
+			"	ld	0,0(%0)\n"
+			"	ld	1,8(%0)\n"
+			"	ld	2,16(%0)\n"
+			"	ld	3,24(%0)\n"
+			"	ld	4,32(%0)\n"
+			"	ld	5,40(%0)\n"
+			"	ld	6,48(%0)\n"
+			"	ld	7,56(%0)\n"
+			"	ld	8,64(%0)\n"
+			"	ld	9,72(%0)\n"
+			"	ld	10,80(%0)\n"
+			"	ld	11,88(%0)\n"
+			"	ld	12,96(%0)\n"
+			"	ld	13,104(%0)\n"
+			"	ld	14,112(%0)\n"
+			"	ld	15,120(%0)\n"
+			:
+			: "a" (fpt_save_area)
+			: "memory");
+	} else {
+		/* Validate vector registers */
+		union ctlreg0 cr0;
+
 		if (!mci.vr) {
 			/*
 			 * Vector registers can't be restored. If the kernel
 			 * currently uses vector registers the system is
 			 * stopped. If the process has its vector registers
-			 * loaded it is terminated.
+			 * loaded it is terminated. Otherwise just validate
+			 * the registers.
 			 */
 			if (S390_lowcore.fpu_flags & KERNEL_VXR)
 				s390_handle_damage();
 			if (!test_cpu_flag(CIF_FPU))
 				kill_task = 1;
 		}
+		cr0.val = S390_lowcore.cregs_save_area[0];
+		cr0.afp = cr0.vx = 1;
+		__ctl_load(cr0.val, 0, 0);
+		asm volatile(
+			"	la	1,%0\n"
+			"	.word	0xe70f,0x1000,0x0036\n" /* vlm 0,15,0(1) */
+			"	.word	0xe70f,0x1100,0x0c36\n" /* vlm 16,31,256(1) */
+			:
+			: "Q" (*(struct vx_array *)mcesa->vector_save_area)
+			: "1");
+		__ctl_load(S390_lowcore.cregs_save_area[0], 0, 0);
 	}
-	/* Check if access registers are valid */
+	/* Validate access registers */
+	asm volatile(
+		"	lam	0,15,0(%0)\n"
+		:
+		: "a" (&S390_lowcore.access_regs_save_area)
+		: "memory");
 	if (!mci.ar) {
 		/*
 		 * Access registers have unknown contents.
@@ -261,7 +311,7 @@ static int notrace s390_check_registers(union mci mci, int umode)
 		 */
 		kill_task = 1;
 	}
-	/* Check guarded storage registers */
+	/* Validate guarded storage registers */
 	cr2.val = S390_lowcore.cregs_save_area[2];
 	if (cr2.gse) {
 		if (!mci.gs) {
@@ -271,31 +321,26 @@ static int notrace s390_check_registers(union mci mci, int umode)
 			 * It has to be terminated.
 			 */
 			kill_task = 1;
+		} else {
+			load_gs_cb((struct gs_cb *)mcesa->guarded_storage_save_area);
 		}
 	}
-	/* Check if old PSW is valid */
-	if (!mci.wp) {
-		/*
-		 * Can't tell if we come from user or kernel mode
-		 * -> stopping machine.
-		 */
-		s390_handle_damage();
-	}
-	/* Check for invalid kernel instruction address */
-	if (!mci.ia && !umode) {
 	/*
-		 * The instruction address got lost while running
-		 * in the kernel -> stopping machine.
+	 * The getcpu vdso syscall reads CPU number from the programmable
+	 * field of the TOD clock. Disregard the TOD programmable register
+	 * validity bit and load the CPU number into the TOD programmable
+	 * field unconditionally.
 	 */
-		s390_handle_damage();
-	}
+	set_tod_programmable_field(raw_smp_processor_id());
+	/* Validate clock comparator register */
+	set_clock_comparator(S390_lowcore.clock_comparator);
 
 	if (!mci.ms || !mci.pm || !mci.ia)
 		kill_task = 1;
 
 	return kill_task;
 }
-NOKPROBE_SYMBOL(s390_check_registers);
+NOKPROBE_SYMBOL(s390_validate_registers);
 
 /*
  * Backup the guest's machine check info to its description block
@@ -353,11 +398,6 @@ int notrace s390_do_machine_check(struct pt_regs *regs)
 	mci.val = S390_lowcore.mcck_interruption_code;
 	mcck = this_cpu_ptr(&cpu_mcck);
 
-	if (mci.sd) {
-		/* System damage -> stopping machine */
-		s390_handle_damage();
-	}
-
 	/*
 	 * Reinject the instruction processing damages' machine checks
 	 * including Delayed Access Exception into the guest
@@ -398,7 +438,7 @@ int notrace s390_do_machine_check(struct pt_regs *regs)
 			s390_handle_damage();
 		}
 	}
-	if (s390_check_registers(mci, user_mode(regs))) {
+	if (s390_validate_registers(mci, user_mode(regs))) {
 		/*
 		 * Couldn't restore all register contents for the
 		 * user space process -> mark task for termination.
@@ -428,21 +468,6 @@ int notrace s390_do_machine_check(struct pt_regs *regs)
 		mcck_pending = 1;
 	}
 
-	/*
-	 * Reinject storage related machine checks into the guest if they
-	 * happen when the guest is running.
-	 */
-	if (!test_cpu_flag(CIF_MCCK_GUEST)) {
-		if (mci.se)
-			/* Storage error uncorrected */
-			s390_handle_damage();
-		if (mci.ke)
-			/* Storage key-error uncorrected */
-			s390_handle_damage();
-		if (mci.ds && mci.fa)
-			/* Storage degradation */
-			s390_handle_damage();
-	}
 	if (mci.cp) {
 		/* Channel report word pending */
 		mcck->channel_report = 1;

arch/s390/kernel/perf_cpum_cf_common.c

@@ -29,7 +29,11 @@ DEFINE_PER_CPU(struct cpu_cf_events, cpu_cf_events) = {
 	},
 	.alert = ATOMIC64_INIT(0),
 	.state = 0,
+	.dev_state = 0,
 	.flags = 0,
+	.used = 0,
+	.usedss = 0,
+	.sets = 0
 };
 /* Indicator whether the CPU-Measurement Counter Facility Support is ready */
 static bool cpum_cf_initalized;
@@ -96,25 +100,10 @@ bool kernel_cpumcf_avail(void)
 }
 EXPORT_SYMBOL(kernel_cpumcf_avail);
 
-
-/* Reserve/release functions for sharing perf hardware */
-static DEFINE_SPINLOCK(cpumcf_owner_lock);
-static void *cpumcf_owner;
-
 /* Initialize the CPU-measurement counter facility */
 int __kernel_cpumcf_begin(void)
 {
 	int flags = PMC_INIT;
-	int err = 0;
-
-	spin_lock(&cpumcf_owner_lock);
-	if (cpumcf_owner)
-		err = -EBUSY;
-	else
-		cpumcf_owner = __builtin_return_address(0);
-	spin_unlock(&cpumcf_owner_lock);
-	if (err)
-		return err;
 
 	on_each_cpu(cpum_cf_setup_cpu, &flags, 1);
 	irq_subclass_register(IRQ_SUBCLASS_MEASUREMENT_ALERT);
@@ -144,10 +133,6 @@ void __kernel_cpumcf_end(void)
 
 	on_each_cpu(cpum_cf_setup_cpu, &flags, 1);
 	irq_subclass_unregister(IRQ_SUBCLASS_MEASUREMENT_ALERT);
-
-	spin_lock(&cpumcf_owner_lock);
-	cpumcf_owner = NULL;
-	spin_unlock(&cpumcf_owner_lock);
 }
 EXPORT_SYMBOL(__kernel_cpumcf_end);
 
@@ -161,11 +146,13 @@ static int cpum_cf_setup(unsigned int cpu, int flags)
 
 static int cpum_cf_online_cpu(unsigned int cpu)
 {
-	return cpum_cf_setup(cpu, PMC_INIT);
+	cpum_cf_setup(cpu, PMC_INIT);
+	return cfset_online_cpu(cpu);
 }
 
 static int cpum_cf_offline_cpu(unsigned int cpu)
 {
+	cfset_offline_cpu(cpu);
 	return cpum_cf_setup(cpu, PMC_RELEASE);
 }
 

arch/s390/kernel/process.c

@@ -166,6 +166,12 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
 			p->thread.acrs[1] = (unsigned int)tls;
 		}
 	}
+	/*
+	 * s390 stores the svc return address in arch_data when calling
+	 * sigreturn()/restart_syscall() via vdso. 1 means no valid address
+	 * stored.
+	 */
+	p->restart_block.arch_data = 1;
 	return 0;
 }
 

arch/s390/kernel/setup.c

@@ -354,7 +354,7 @@ void __init arch_call_rest_init(void)
 	set_task_stack_end_magic(current);
 	stack += STACK_INIT_OFFSET;
 	S390_lowcore.kernel_stack = stack;
-	CALL_ON_STACK_NORETURN(rest_init, stack);
+	call_on_stack_noreturn(rest_init, stack);
 }
 
 static void __init setup_lowcore_dat_off(void)
@@ -442,6 +442,7 @@ static void __init setup_lowcore_dat_off(void)
 	lc->br_r1_trampoline = 0x07f1;	/* br %r1 */
 	lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
 	lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
+	lc->preempt_count = PREEMPT_DISABLED;
 
 	set_prefix((u32)(unsigned long) lc);
 	lowcore_ptr[0] = lc;

arch/s390/kernel/signal.c

@@ -32,6 +32,7 @@
 #include <linux/uaccess.h>
 #include <asm/lowcore.h>
 #include <asm/switch_to.h>
+#include <asm/vdso.h>
 #include "entry.h"
 
 /*
@@ -171,7 +172,6 @@ static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
 	fpregs_load(&user_sregs.fpregs, &current->thread.fpu);
 
 	clear_pt_regs_flag(regs, PIF_SYSCALL); /* No longer in a system call */
-	clear_pt_regs_flag(regs, PIF_SYSCALL_RESTART);
 	return 0;
 }
 
@@ -334,15 +334,10 @@ static int setup_frame(int sig, struct k_sigaction *ka,
 
 	/* Set up to return from userspace.  If provided, use a stub
 	   already in userspace.  */
-	if (ka->sa.sa_flags & SA_RESTORER) {
+	if (ka->sa.sa_flags & SA_RESTORER)
 		restorer = (unsigned long) ka->sa.sa_restorer;
-	} else {
-		/* Signal frame without vector registers are short ! */
-		__u16 __user *svc = (void __user *) frame + frame_size - 2;
-		if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, svc))
-			return -EFAULT;
-		restorer = (unsigned long) svc;
-	}
+	else
+		restorer = VDSO64_SYMBOL(current, sigreturn);
 
 	/* Set up registers for signal handler */
 	regs->gprs[14] = restorer;
@@ -397,14 +392,10 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
 
 	/* Set up to return from userspace.  If provided, use a stub
 	   already in userspace.  */
-	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
+	if (ksig->ka.sa.sa_flags & SA_RESTORER)
 		restorer = (unsigned long) ksig->ka.sa.sa_restorer;
-	} else {
-		__u16 __user *svc = &frame->svc_insn;
-		if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, svc))
-			return -EFAULT;
-		restorer = (unsigned long) svc;
-	}
+	else
+		restorer = VDSO64_SYMBOL(current, rt_sigreturn);
 
 	/* Create siginfo on the signal stack */
 	if (copy_siginfo_to_user(&frame->info, &ksig->info))
@@ -501,7 +492,7 @@ void arch_do_signal_or_restart(struct pt_regs *regs, bool has_signal)
 		}
 		/* No longer in a system call */
 		clear_pt_regs_flag(regs, PIF_SYSCALL);
-		clear_pt_regs_flag(regs, PIF_SYSCALL_RESTART);
+
 		rseq_signal_deliver(&ksig, regs);
 		if (is_compat_task())
 			handle_signal32(&ksig, oldset, regs);
@@ -517,14 +508,20 @@ void arch_do_signal_or_restart(struct pt_regs *regs, bool has_signal)
 		switch (regs->gprs[2]) {
 		case -ERESTART_RESTARTBLOCK:
 			/* Restart with sys_restart_syscall */
-			regs->int_code = __NR_restart_syscall;
-			fallthrough;
+			regs->gprs[2] = regs->orig_gpr2;
+			current->restart_block.arch_data = regs->psw.addr;
+			if (is_compat_task())
+				regs->psw.addr = VDSO32_SYMBOL(current, restart_syscall);
+			else
+				regs->psw.addr = VDSO64_SYMBOL(current, restart_syscall);
+			if (test_thread_flag(TIF_SINGLE_STEP))
+				clear_thread_flag(TIF_PER_TRAP);
+			break;
 		case -ERESTARTNOHAND:
 		case -ERESTARTSYS:
 		case -ERESTARTNOINTR:
-			/* Restart system call with magic TIF bit. */
 			regs->gprs[2] = regs->orig_gpr2;
-			set_pt_regs_flag(regs, PIF_SYSCALL_RESTART);
+			regs->psw.addr = __rewind_psw(regs->psw, regs->int_code >> 16);
 			if (test_thread_flag(TIF_SINGLE_STEP))
 				clear_thread_flag(TIF_PER_TRAP);
 			break;

arch/s390/kernel/smp.c

@@ -210,6 +210,7 @@ static int pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu)
 	lc->br_r1_trampoline = 0x07f1;	/* br %r1 */
 	lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
 	lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
+	lc->preempt_count = PREEMPT_DISABLED;
 	if (nmi_alloc_per_cpu(lc))
 		goto out;
 	lowcore_ptr[cpu] = lc;
@@ -300,24 +301,28 @@ static void pcpu_start_fn(struct pcpu *pcpu, void (*func)(void *), void *data)
 	pcpu_sigp_retry(pcpu, SIGP_RESTART, 0);
 }
 
+typedef void (pcpu_delegate_fn)(void *);
+
 /*
  * Call function via PSW restart on pcpu and stop the current cpu.
  */
-static void __pcpu_delegate(void (*func)(void*), void *data)
+static void __pcpu_delegate(pcpu_delegate_fn *func, void *data)
 {
 	func(data);	/* should not return */
 }
 
 static void __no_sanitize_address pcpu_delegate(struct pcpu *pcpu,
-						void (*func)(void *),
+						pcpu_delegate_fn *func,
 						void *data, unsigned long stack)
 {
 	struct lowcore *lc = lowcore_ptr[pcpu - pcpu_devices];
 	unsigned long source_cpu = stap();
 
 	__load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT);
-	if (pcpu->address == source_cpu)
-		CALL_ON_STACK(__pcpu_delegate, stack, 2, func, data);
+	if (pcpu->address == source_cpu) {
+		call_on_stack(2, stack, void, __pcpu_delegate,
+			      pcpu_delegate_fn *, func, void *, data);
+	}
 	/* Stop target cpu (if func returns this stops the current cpu). */
 	pcpu_sigp_retry(pcpu, SIGP_STOP, 0);
 	/* Restart func on the target cpu and stop the current cpu. */
@@ -898,7 +903,7 @@ static void __no_sanitize_address smp_start_secondary(void *cpuvoid)
 	S390_lowcore.restart_source = -1UL;
 	__ctl_load(S390_lowcore.cregs_save_area, 0, 15);
 	__load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT);
-	CALL_ON_STACK_NORETURN(smp_init_secondary, S390_lowcore.kernel_stack);
+	call_on_stack_noreturn(smp_init_secondary, S390_lowcore.kernel_stack);
 }
 
 /* Upping and downing of CPUs */

arch/s390/kernel/syscall.c

@@ -108,7 +108,7 @@ SYSCALL_DEFINE0(ni_syscall)
 	return -ENOSYS;
 }
 
-void do_syscall(struct pt_regs *regs)
+static void do_syscall(struct pt_regs *regs)
 {
 	unsigned long nr;
 
@@ -121,6 +121,10 @@ void do_syscall(struct pt_regs *regs)
 
 	regs->gprs[2] = nr;
 
+	if (nr == __NR_restart_syscall && !(current->restart_block.arch_data & 1)) {
+		regs->psw.addr = current->restart_block.arch_data;
+		current->restart_block.arch_data = 1;
+	}
 	nr = syscall_enter_from_user_mode_work(regs, nr);
 
 	/*
@@ -130,13 +134,16 @@ void do_syscall(struct pt_regs *regs)
 	 * work, the ptrace code sets PIF_SYSCALL_RET_SET, which is checked here
 	 * and if set, the syscall will be skipped.
 	 */
-	if (!test_pt_regs_flag(regs, PIF_SYSCALL_RET_SET)) {
+
+	if (unlikely(test_and_clear_pt_regs_flag(regs, PIF_SYSCALL_RET_SET)))
+		goto out;
 	regs->gprs[2] = -ENOSYS;
-		if (likely(nr < NR_syscalls))
+	if (likely(nr >= NR_syscalls))
+		goto out;
+	do {
 		regs->gprs[2] = current->thread.sys_call_table[nr](regs);
-	} else {
-		clear_pt_regs_flag(regs, PIF_SYSCALL_RET_SET);
-	}
+	} while (test_and_clear_pt_regs_flag(regs, PIF_EXECVE_PGSTE_RESTART));
+out:
 	syscall_exit_to_user_mode_work(regs);
 }
 
@@ -154,13 +161,8 @@ void noinstr __do_syscall(struct pt_regs *regs, int per_trap)
 	if (per_trap)
 		set_thread_flag(TIF_PER_TRAP);
 
-	for (;;) {
 	regs->flags = 0;
 	set_pt_regs_flag(regs, PIF_SYSCALL);
 	do_syscall(regs);
-		if (!test_pt_regs_flag(regs, PIF_SYSCALL_RESTART))
-			break;
-		local_irq_enable();
-	}
 	exit_to_user_mode();
 }

arch/s390/kernel/traps.c

@@ -277,6 +277,8 @@ static void __init test_monitor_call(void)
 {
 	int val = 1;
 
+	if (!IS_ENABLED(CONFIG_BUG))
+		return;
 	asm volatile(
 		"	mc	0,0\n"
 		"0:	xgr	%0,%0\n"
@@ -299,10 +301,9 @@ static void (*pgm_check_table[128])(struct pt_regs *regs);
 void noinstr __do_pgm_check(struct pt_regs *regs)
 {
 	unsigned long last_break = S390_lowcore.breaking_event_addr;
-	unsigned int trapnr, syscall_redirect = 0;
+	unsigned int trapnr;
 	irqentry_state_t state;
 
-	add_random_kstack_offset();
 	regs->int_code = *(u32 *)&S390_lowcore.pgm_ilc;
 	regs->int_parm_long = S390_lowcore.trans_exc_code;
 
@@ -344,18 +345,9 @@ void noinstr __do_pgm_check(struct pt_regs *regs)
 	trapnr = regs->int_code & PGM_INT_CODE_MASK;
 	if (trapnr)
 		pgm_check_table[trapnr](regs);
-	syscall_redirect = user_mode(regs) && test_pt_regs_flag(regs, PIF_SYSCALL);
 out:
 	local_irq_disable();
 	irqentry_exit(regs, state);
-
-	if (syscall_redirect) {
-		enter_from_user_mode(regs);
-		local_irq_enable();
-		regs->orig_gpr2 = regs->gprs[2];
-		do_syscall(regs);
-		exit_to_user_mode();
-	}
 }
 
 /*

arch/s390/kernel/uv.c

@@ -358,6 +358,15 @@ static ssize_t uv_query_facilities(struct kobject *kobj,
 static struct kobj_attribute uv_query_facilities_attr =
 	__ATTR(facilities, 0444, uv_query_facilities, NULL);
 
+static ssize_t uv_query_feature_indications(struct kobject *kobj,
+					    struct kobj_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%lx\n", uv_info.uv_feature_indications);
+}
+
+static struct kobj_attribute uv_query_feature_indications_attr =
+	__ATTR(feature_indications, 0444, uv_query_feature_indications, NULL);
+
 static ssize_t uv_query_max_guest_cpus(struct kobject *kobj,
 				       struct kobj_attribute *attr, char *page)
 {
@@ -390,6 +399,7 @@ static struct kobj_attribute uv_query_max_guest_addr_attr =
 
 static struct attribute *uv_query_attrs[] = {
 	&uv_query_facilities_attr.attr,
+	&uv_query_feature_indications_attr.attr,
 	&uv_query_max_guest_cpus_attr.attr,
 	&uv_query_max_guest_vms_attr.attr,
 	&uv_query_max_guest_addr_attr.attr,

arch/s390/kernel/vdso.c

@@ -20,7 +20,7 @@
 #include <asm/vdso.h>
 
 extern char vdso64_start[], vdso64_end[];
-static unsigned int vdso_pages;
+extern char vdso32_start[], vdso32_end[];
 
 static struct vm_special_mapping vvar_mapping;
 
@@ -37,18 +37,6 @@ enum vvar_pages {
 	VVAR_NR_PAGES,
 };
 
-unsigned int __read_mostly vdso_enabled = 1;
-
-static int __init vdso_setup(char *str)
-{
-	bool enabled;
-
-	if (!kstrtobool(str, &enabled))
-		vdso_enabled = enabled;
-	return 1;
-}
-__setup("vdso=", vdso_setup);
-
 #ifdef CONFIG_TIME_NS
 struct vdso_data *arch_get_vdso_data(void *vvar_page)
 {
@@ -155,7 +143,12 @@ static struct vm_special_mapping vvar_mapping = {
 	.fault = vvar_fault,
 };
 
-static struct vm_special_mapping vdso_mapping = {
+static struct vm_special_mapping vdso64_mapping = {
+	.name = "[vdso]",
+	.mremap = vdso_mremap,
+};
+
+static struct vm_special_mapping vdso32_mapping = {
 	.name = "[vdso]",
 	.mremap = vdso_mremap,
 };
@@ -171,16 +164,22 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 {
 	unsigned long vdso_text_len, vdso_mapping_len;
 	unsigned long vvar_start, vdso_text_start;
+	struct vm_special_mapping *vdso_mapping;
 	struct mm_struct *mm = current->mm;
 	struct vm_area_struct *vma;
 	int rc;
 
 	BUILD_BUG_ON(VVAR_NR_PAGES != __VVAR_PAGES);
-	if (!vdso_enabled || is_compat_task())
-		return 0;
 	if (mmap_write_lock_killable(mm))
 		return -EINTR;
-	vdso_text_len = vdso_pages << PAGE_SHIFT;
+
+	if (is_compat_task()) {
+		vdso_text_len = vdso32_end - vdso32_start;
+		vdso_mapping = &vdso32_mapping;
+	} else {
+		vdso_text_len = vdso64_end - vdso64_start;
+		vdso_mapping = &vdso64_mapping;
+	}
 	vdso_mapping_len = vdso_text_len + VVAR_NR_PAGES * PAGE_SIZE;
 	vvar_start = get_unmapped_area(NULL, 0, vdso_mapping_len, 0, 0);
 	rc = vvar_start;
@@ -198,7 +197,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 	vma = _install_special_mapping(mm, vdso_text_start, vdso_text_len,
 				       VM_READ|VM_EXEC|
 				       VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
-				       &vdso_mapping);
+				       vdso_mapping);
 	if (IS_ERR(vma)) {
 		do_munmap(mm, vvar_start, PAGE_SIZE, NULL);
 		rc = PTR_ERR(vma);
@@ -211,21 +210,25 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 	return rc;
 }
 
-static int __init vdso_init(void)
+static struct page ** __init vdso_setup_pages(void *start, void *end)
 {
-	struct page **pages;
+	int pages = (end - start) >> PAGE_SHIFT;
+	struct page **pagelist;
 	int i;
 
-	vdso_pages = (vdso64_end - vdso64_start) >> PAGE_SHIFT;
-	pages = kcalloc(vdso_pages + 1, sizeof(struct page *), GFP_KERNEL);
-	if (!pages) {
-		vdso_enabled = 0;
-		return -ENOMEM;
-	}
-	for (i = 0; i < vdso_pages; i++)
-		pages[i] = virt_to_page(vdso64_start + i * PAGE_SIZE);
-	pages[vdso_pages] = NULL;
-	vdso_mapping.pages = pages;
+	pagelist = kcalloc(pages + 1, sizeof(struct page *), GFP_KERNEL);
+	if (!pagelist)
+		panic("%s: Cannot allocate page list for VDSO", __func__);
+	for (i = 0; i < pages; i++)
+		pagelist[i] = virt_to_page(start + i * PAGE_SIZE);
+	return pagelist;
+}
+
+static int __init vdso_init(void)
+{
+	vdso64_mapping.pages = vdso_setup_pages(vdso64_start, vdso64_end);
+	if (IS_ENABLED(CONFIG_COMPAT))
+		vdso32_mapping.pages = vdso_setup_pages(vdso32_start, vdso32_end);
 	return 0;
 }
 arch_initcall(vdso_init);

arch/s390/kernel/vdso32/.gitignore

+# SPDX-License-Identifier: GPL-2.0-only
+vdso32.lds

arch/s390/kernel/vdso32/Makefile

+# SPDX-License-Identifier: GPL-2.0
+# List of files in the vdso
+
+KCOV_INSTRUMENT := n
+ARCH_REL_TYPE_ABS := R_390_COPY|R_390_GLOB_DAT|R_390_JMP_SLOT|R_390_RELATIVE
+ARCH_REL_TYPE_ABS += R_390_GOT|R_390_PLT
+
+include $(srctree)/lib/vdso/Makefile
+obj-vdso32 = vdso_user_wrapper-32.o note-32.o
+
+# Build rules
+
+targets := $(obj-vdso32) vdso32.so vdso32.so.dbg
+obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
+
+KBUILD_AFLAGS += -DBUILD_VDSO
+KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING
+
+KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS))
+KBUILD_AFLAGS_32 += -m31 -s
+
+KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
+KBUILD_CFLAGS_32 += -m31 -fPIC -shared -fno-common -fno-builtin
+
+LDFLAGS_vdso32.so.dbg += -fPIC -shared -nostdlib -soname=linux-vdso32.so.1 \
+	--hash-style=both --build-id=sha1 -melf_s390 -T
+
+$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
+$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
+
+obj-y += vdso32_wrapper.o
+CPPFLAGS_vdso32.lds += -P -C -U$(ARCH)
+
+# Disable gcov profiling, ubsan and kasan for VDSO code
+GCOV_PROFILE := n
+UBSAN_SANITIZE := n
+KASAN_SANITIZE := n
+
+# Force dependency (incbin is bad)
+$(obj)/vdso32_wrapper.o : $(obj)/vdso32.so
+
+$(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) FORCE
+	$(call if_changed,ld)
+
+# strip rule for the .so file
+$(obj)/%.so: OBJCOPYFLAGS := -S
+$(obj)/%.so: $(obj)/%.so.dbg FORCE
+	$(call if_changed,objcopy)
+
+$(obj-vdso32): %-32.o: %.S FORCE
+	$(call if_changed_dep,vdso32as)
+
+# actual build commands
+quiet_cmd_vdso32as = VDSO32A $@
+      cmd_vdso32as = $(CC) $(a_flags) -c -o $@ $<
+quiet_cmd_vdso32cc = VDSO32C $@
+      cmd_vdso32cc = $(CC) $(c_flags) -c -o $@ $<
+
+# install commands for the unstripped file
+quiet_cmd_vdso_install = INSTALL $@
+      cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
+
+vdso32.so: $(obj)/vdso32.so.dbg
+	@mkdir -p $(MODLIB)/vdso
+	$(call cmd,vdso_install)
+
+vdso_install: vdso32.so
+
+# Generate VDSO offsets using helper script
+gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
+quiet_cmd_vdsosym = VDSOSYM $@
+	cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
+
+include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE
+	$(call if_changed,vdsosym)

arch/s390/kernel/vdso32/gen_vdso_offsets.sh

+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+#
+# Match symbols in the DSO that look like VDSO_*; produce a header file
+# of constant offsets into the shared object.
+#
+# Doing this inside the Makefile will break the $(filter-out) function,
+# causing Kbuild to rebuild the vdso-offsets header file every time.
+#
+# Inspired by arm64 version.
+#
+
+LC_ALL=C
+sed -n 's/\([0-9a-f]*\) . __kernel_compat_\(.*\)/\#define vdso32_offset_\2\t0x\1/p'

arch/s390/kernel/vdso32/note.S

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text.
+ * Here we can supply some information useful to userland.
+ */
+
+#include <linux/uts.h>
+#include <linux/version.h>
+#include <linux/elfnote.h>
+
+ELFNOTE_START(Linux, 0, "a")
+	.long LINUX_VERSION_CODE
+ELFNOTE_END

arch/s390/kernel/vdso32/vdso32.lds.S

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This is the infamous ld script for the 64 bits vdso
+ * library
+ */
+
+#include <asm/page.h>
+#include <asm/vdso.h>
+
+OUTPUT_FORMAT("elf32-s390", "elf32-s390", "elf32-s390")
+OUTPUT_ARCH(s390:31-bit)
+ENTRY(_start)
+
+SECTIONS
+{
+	PROVIDE(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE);
+#ifdef CONFIG_TIME_NS
+	PROVIDE(_timens_data = _vdso_data + PAGE_SIZE);
+#endif
+	. = VDSO_LBASE + SIZEOF_HEADERS;
+
+	.hash		: { *(.hash) }			:text
+	.gnu.hash	: { *(.gnu.hash) }
+	.dynsym		: { *(.dynsym) }
+	.dynstr		: { *(.dynstr) }
+	.gnu.version	: { *(.gnu.version) }
+	.gnu.version_d	: { *(.gnu.version_d) }
+	.gnu.version_r	: { *(.gnu.version_r) }
+
+	.note		: { *(.note.*) }		:text	:note
+
+	. = ALIGN(16);
+	.text		: {
+		*(.text .stub .text.* .gnu.linkonce.t.*)
+	} :text
+	PROVIDE(__etext = .);
+	PROVIDE(_etext = .);
+	PROVIDE(etext = .);
+
+	/*
+	 * Other stuff is appended to the text segment:
+	 */
+	.rodata		: { *(.rodata .rodata.* .gnu.linkonce.r.*) }
+	.rodata1	: { *(.rodata1) }
+
+	.dynamic	: { *(.dynamic) }		:text	:dynamic
+
+	.eh_frame_hdr	: { *(.eh_frame_hdr) }		:text	:eh_frame_hdr
+	.eh_frame	: { KEEP (*(.eh_frame)) }	:text
+	.gcc_except_table : { *(.gcc_except_table .gcc_except_table.*) }
+
+	.rela.dyn ALIGN(8) : { *(.rela.dyn) }
+	.got ALIGN(8)	: { *(.got .toc) }
+
+	_end = .;
+	PROVIDE(end = .);
+
+	/*
+	 * Stabs debugging sections are here too.
+	 */
+	.stab	       0 : { *(.stab) }
+	.stabstr       0 : { *(.stabstr) }
+	.stab.excl     0 : { *(.stab.excl) }
+	.stab.exclstr  0 : { *(.stab.exclstr) }
+	.stab.index    0 : { *(.stab.index) }
+	.stab.indexstr 0 : { *(.stab.indexstr) }
+	.comment       0 : { *(.comment) }
+
+	/*
+	 * DWARF debug sections.
+	 * Symbols in the DWARF debugging sections are relative to the
+	 * beginning of the section so we begin them at 0.
+	 */
+	/* DWARF 1 */
+	.debug		0 : { *(.debug) }
+	.line		0 : { *(.line) }
+	/* GNU DWARF 1 extensions */
+	.debug_srcinfo	0 : { *(.debug_srcinfo) }
+	.debug_sfnames	0 : { *(.debug_sfnames) }
+	/* DWARF 1.1 and DWARF 2 */
+	.debug_aranges	0 : { *(.debug_aranges) }
+	.debug_pubnames 0 : { *(.debug_pubnames) }
+	/* DWARF 2 */
+	.debug_info	0 : { *(.debug_info .gnu.linkonce.wi.*) }
+	.debug_abbrev	0 : { *(.debug_abbrev) }
+	.debug_line	0 : { *(.debug_line) }
+	.debug_frame	0 : { *(.debug_frame) }
+	.debug_str	0 : { *(.debug_str) }
+	.debug_loc	0 : { *(.debug_loc) }
+	.debug_macinfo	0 : { *(.debug_macinfo) }
+	/* SGI/MIPS DWARF 2 extensions */
+	.debug_weaknames 0 : { *(.debug_weaknames) }
+	.debug_funcnames 0 : { *(.debug_funcnames) }
+	.debug_typenames 0 : { *(.debug_typenames) }
+	.debug_varnames  0 : { *(.debug_varnames) }
+	/* DWARF 3 */
+	.debug_pubtypes 0 : { *(.debug_pubtypes) }
+	.debug_ranges	0 : { *(.debug_ranges) }
+	.gnu.attributes 0 : { KEEP (*(.gnu.attributes)) }
+
+	/DISCARD/	: {
+		*(.note.GNU-stack)
+		*(.branch_lt)
+		*(.data .data.* .gnu.linkonce.d.* .sdata*)
+		*(.bss .sbss .dynbss .dynsbss)
+	}
+}
+
+/*
+ * Very old versions of ld do not recognize this name token; use the constant.
+ */
+#define PT_GNU_EH_FRAME	0x6474e550
+
+/*
+ * We must supply the ELF program headers explicitly to get just one
+ * PT_LOAD segment, and set the flags explicitly to make segments read-only.
+ */
+PHDRS
+{
+	text		PT_LOAD FILEHDR PHDRS FLAGS(5);	/* PF_R|PF_X */
+	dynamic		PT_DYNAMIC FLAGS(4);		/* PF_R */
+	note		PT_NOTE FLAGS(4);		/* PF_R */
+	eh_frame_hdr	PT_GNU_EH_FRAME;
+}
+
+/*
+ * This controls what symbols we export from the DSO.
+ */
+VERSION
+{
+	VDSO_VERSION_STRING {
+	global:
+		/*
+		 * Has to be there for the kernel to find
+		 */
+		__kernel_compat_restart_syscall;
+		__kernel_compat_rt_sigreturn;
+		__kernel_compat_sigreturn;
+	local: *;
+	};
+}

arch/s390/kernel/vdso32/vdso32_wrapper.S

+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <asm/page.h>
+
+	__PAGE_ALIGNED_DATA
+
+	.globl vdso32_start, vdso32_end
+	.balign PAGE_SIZE
+vdso32_start:
+	.incbin "arch/s390/kernel/vdso32/vdso32.so"
+	.balign PAGE_SIZE
+vdso32_end:
+
+	.previous

arch/s390/kernel/vdso32/vdso_user_wrapper.S

+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <asm/unistd.h>
+#include <asm/dwarf.h>
+
+.macro vdso_syscall func,syscall
+	.globl __kernel_compat_\func
+	.type  __kernel_compat_\func,@function
+	.align 8
+__kernel_compat_\func:
+	CFI_STARTPROC
+	svc	\syscall
+	/* Make sure we notice when a syscall returns, which shouldn't happen */
+	.word	0
+	CFI_ENDPROC
+	.size	__kernel_compat_\func,.-__kernel_compat_\func
+.endm
+
+vdso_syscall restart_syscall,__NR_restart_syscall
+vdso_syscall sigreturn,__NR_sigreturn
+vdso_syscall rt_sigreturn,__NR_rt_sigreturn

arch/s390/kernel/vdso64/Makefile

@@ -74,3 +74,11 @@ vdso64.so: $(obj)/vdso64.so.dbg
 	$(call cmd,vdso_install)
 
 vdso_install: vdso64.so
+
+# Generate VDSO offsets using helper script
+gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
+quiet_cmd_vdsosym = VDSOSYM $@
+	cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
+
+include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE
+	$(call if_changed,vdsosym)

arch/s390/kernel/vdso64/gen_vdso_offsets.sh

+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+#
+# Match symbols in the DSO that look like VDSO_*; produce a header file
+# of constant offsets into the shared object.
+#
+# Doing this inside the Makefile will break the $(filter-out) function,
+# causing Kbuild to rebuild the vdso-offsets header file every time.
+#
+# Inspired by arm64 version.
+#
+
+LC_ALL=C
+sed -n 's/\([0-9a-f]*\) . __kernel_\(.*\)/\#define vdso64_offset_\2\t0x\1/p'

arch/s390/kernel/vdso64/vdso64.lds.S

@@ -17,7 +17,7 @@ SECTIONS
 #ifdef CONFIG_TIME_NS
 	PROVIDE(_timens_data = _vdso_data + PAGE_SIZE);
 #endif
-	. = VDSO64_LBASE + SIZEOF_HEADERS;
+	. = VDSO_LBASE + SIZEOF_HEADERS;
 
 	.hash		: { *(.hash) }			:text
 	.gnu.hash	: { *(.gnu.hash) }
@@ -137,6 +137,9 @@ VERSION
 		__kernel_clock_gettime;
 		__kernel_clock_getres;
 		__kernel_getcpu;
+		__kernel_restart_syscall;
+		__kernel_rt_sigreturn;
+		__kernel_sigreturn;
 	local: *;
 	};
 }

arch/s390/kernel/vdso64/vdso_user_wrapper.S

@@ -37,3 +37,20 @@ vdso_func gettimeofday
 vdso_func clock_getres
 vdso_func clock_gettime
 vdso_func getcpu
+
+.macro vdso_syscall func,syscall
+	.globl __kernel_\func
+	.type  __kernel_\func,@function
+	.align 8
+__kernel_\func:
+	CFI_STARTPROC
+	svc	\syscall
+	/* Make sure we notice when a syscall returns, which shouldn't happen */
+	.word	0
+	CFI_ENDPROC
+	.size	__kernel_\func,.-__kernel_\func
+.endm
+
+vdso_syscall restart_syscall,__NR_restart_syscall
+vdso_syscall sigreturn,__NR_sigreturn
+vdso_syscall rt_sigreturn,__NR_rt_sigreturn

arch/s390/lib/string.c

@@ -162,7 +162,7 @@ char *strcat(char *dest, const char *src)
 		"	jo	0b\n"
 		"1:	mvst	%[dummy],%[src]\n"
 		"	jo	1b\n"
-		: [dummy] "=&a" (dummy), [dest] "+&a" (dest), [src] "+&a" (src)
+		: [dummy] "+&a" (dummy), [dest] "+&a" (dest), [src] "+&a" (src)
 		:
 		: "cc", "memory", "0");
 	return ret;

arch/s390/lib/test_unwind.c

@@ -120,7 +120,7 @@ static struct unwindme *unwindme;
 #define UWM_REGS		0x2	/* Pass regs to test_unwind(). */
 #define UWM_SP			0x4	/* Pass sp to test_unwind(). */
 #define UWM_CALLER		0x8	/* Unwind starting from caller. */
-#define UWM_SWITCH_STACK	0x10	/* Use CALL_ON_STACK. */
+#define UWM_SWITCH_STACK	0x10	/* Use call_on_stack. */
 #define UWM_IRQ			0x20	/* Unwind from irq context. */
 #define UWM_PGM			0x40	/* Unwind from program check handler. */
 
@@ -211,7 +211,8 @@ static noinline int unwindme_func2(struct unwindme *u)
 	if (u->flags & UWM_SWITCH_STACK) {
 		local_irq_save(flags);
 		local_mcck_disable();
-		rc = CALL_ON_STACK(unwindme_func3, S390_lowcore.nodat_stack, 1, u);
+		rc = call_on_stack(1, S390_lowcore.nodat_stack,
+				   int, unwindme_func3, struct unwindme *, u);
 		local_mcck_enable();
 		local_irq_restore(flags);
 		return rc;

arch/s390/lib/uaccess.c

@@ -224,7 +224,7 @@ static inline unsigned long copy_in_user_mvcos(void __user *to, const void __use
 		EX_TABLE(0b,3b)
 		: "+a" (size), "+a" (to), "+a" (from), "+a" (tmp1), "=a" (tmp2)
 		: [spec] "d" (0x810081UL)
-		: "cc", "memory");
+		: "cc", "memory", "0");
 	return size;
 }
 

arch/s390/mm/fault.c

@@ -285,26 +285,6 @@ static noinline void do_sigbus(struct pt_regs *regs)
 			(void __user *)(regs->int_parm_long & __FAIL_ADDR_MASK));
 }
 
-static noinline int signal_return(struct pt_regs *regs)
-{
-	u16 instruction;
-	int rc;
-
-	rc = __get_user(instruction, (u16 __user *) regs->psw.addr);
-	if (rc)
-		return rc;
-	if (instruction == 0x0a77) {
-		set_pt_regs_flag(regs, PIF_SYSCALL);
-		regs->int_code = 0x00040077;
-		return 0;
-	} else if (instruction == 0x0aad) {
-		set_pt_regs_flag(regs, PIF_SYSCALL);
-		regs->int_code = 0x000400ad;
-		return 0;
-	}
-	return -EACCES;
-}
-
 static noinline void do_fault_error(struct pt_regs *regs, int access,
 					vm_fault_t fault)
 {
@@ -312,9 +292,6 @@ static noinline void do_fault_error(struct pt_regs *regs, int access,
 
 	switch (fault) {
 	case VM_FAULT_BADACCESS:
-		if (access == VM_EXEC && signal_return(regs) == 0)
-			break;
-		fallthrough;
 	case VM_FAULT_BADMAP:
 		/* Bad memory access. Check if it is kernel or user space. */
 		if (user_mode(regs)) {
@@ -792,6 +769,32 @@ void do_secure_storage_access(struct pt_regs *regs)
 	struct page *page;
 	int rc;
 
+	/*
+	 * bit 61 tells us if the address is valid, if it's not we
+	 * have a major problem and should stop the kernel or send a
+	 * SIGSEGV to the process. Unfortunately bit 61 is not
+	 * reliable without the misc UV feature so we need to check
+	 * for that as well.
+	 */
+	if (test_bit_inv(BIT_UV_FEAT_MISC, &uv_info.uv_feature_indications) &&
+	    !test_bit_inv(61, &regs->int_parm_long)) {
+		/*
+		 * When this happens, userspace did something that it
+		 * was not supposed to do, e.g. branching into secure
+		 * memory. Trigger a segmentation fault.
+		 */
+		if (user_mode(regs)) {
+			send_sig(SIGSEGV, current, 0);
+			return;
+		}
+
+		/*
+		 * The kernel should never run into this case and we
+		 * have no way out of this situation.
+		 */
+		panic("Unexpected PGM 0x3d with TEID bit 61=0");
+	}
+
 	switch (get_fault_type(regs)) {
 	case USER_FAULT:
 		mm = current->mm;

arch/s390/mm/maccess.c

@@ -125,12 +125,18 @@ static unsigned long __no_sanitize_address _memcpy_real(unsigned long dest,
  */
 int memcpy_real(void *dest, void *src, size_t count)
 {
+	unsigned long _dest  = (unsigned long)dest;
+	unsigned long _src   = (unsigned long)src;
+	unsigned long _count = (unsigned long)count;
 	int rc;
 
 	if (S390_lowcore.nodat_stack != 0) {
 		preempt_disable();
-		rc = CALL_ON_STACK(_memcpy_real, S390_lowcore.nodat_stack, 3,
-				   dest, src, count);
+		rc = call_on_stack(3, S390_lowcore.nodat_stack,
+				   unsigned long, _memcpy_real,
+				   unsigned long, _dest,
+				   unsigned long, _src,
+				   unsigned long, _count);
 		preempt_enable();
 		return rc;
 	}
@@ -139,8 +145,7 @@ int memcpy_real(void *dest, void *src, size_t count)
 	 * not set up yet. Just call _memcpy_real on the early boot
 	 * stack
 	 */
-	return _memcpy_real((unsigned long) dest,(unsigned long) src,
-			    (unsigned long) count);
+	return _memcpy_real(_dest, _src, _count);
 }
 
 /*

drivers/s390/crypto/ap_bus.c

@@ -61,6 +61,9 @@ static char *aqm_str;
 module_param_named(aqmask, aqm_str, charp, 0440);
 MODULE_PARM_DESC(aqmask, "AP bus domain mask.");
 
+atomic_t ap_max_msg_size = ATOMIC_INIT(AP_DEFAULT_MAX_MSG_SIZE);
+EXPORT_SYMBOL(ap_max_msg_size);
+
 static struct device *ap_root_device;
 
 /* Hashtable of all queue devices on the AP bus */
@@ -316,11 +319,24 @@ EXPORT_SYMBOL(ap_test_config_ctrl_domain);
  * Returns true if TAPQ succeeded and the info is filled or
  * false otherwise.
  */
-static bool ap_queue_info(ap_qid_t qid, int *q_type,
-			  unsigned int *q_fac, int *q_depth, bool *q_decfg)
+static bool ap_queue_info(ap_qid_t qid, int *q_type, unsigned int *q_fac,
+			  int *q_depth, int *q_ml, bool *q_decfg)
 {
 	struct ap_queue_status status;
-	unsigned long info = 0;
+	union {
+		unsigned long value;
+		struct {
+			unsigned int fac   : 32; /* facility bits */
+			unsigned int at	   :  8; /* ap type */
+			unsigned int _res1 :  8;
+			unsigned int _res2 :  4;
+			unsigned int ml	   :  4; /* apxl ml */
+			unsigned int _res3 :  4;
+			unsigned int qd	   :  4; /* queue depth */
+		} tapq_gr2;
+	} tapq_info;
+
+	tapq_info.value = 0;
 
 	/* make sure we don't run into a specifiation exception */
 	if (AP_QID_CARD(qid) > ap_max_adapter_id ||
@@ -328,7 +344,7 @@ static bool ap_queue_info(ap_qid_t qid, int *q_type,
 		return false;
 
 	/* call TAPQ on this APQN */
-	status = ap_test_queue(qid, ap_apft_available(), &info);
+	status = ap_test_queue(qid, ap_apft_available(), &tapq_info.value);
 	switch (status.response_code) {
 	case AP_RESPONSE_NORMAL:
 	case AP_RESPONSE_RESET_IN_PROGRESS:
@@ -340,11 +356,12 @@ static bool ap_queue_info(ap_qid_t qid, int *q_type,
 		 * info should be filled. All bits 0 is not possible as
 		 * there is at least one of the mode bits set.
 		 */
-		if (WARN_ON_ONCE(!info))
+		if (WARN_ON_ONCE(!tapq_info.value))
 			return false;
-		*q_type = (int)((info >> 24) & 0xff);
-		*q_fac = (unsigned int)(info >> 32);
-		*q_depth = (int)(info & 0xff);
+		*q_type = tapq_info.tapq_gr2.at;
+		*q_fac = tapq_info.tapq_gr2.fac;
+		*q_depth = tapq_info.tapq_gr2.qd;
+		*q_ml = tapq_info.tapq_gr2.ml;
 		*q_decfg = status.response_code == AP_RESPONSE_DECONFIGURED;
 		switch (*q_type) {
 			/* For CEX2 and CEX3 the available functions
@@ -1516,7 +1533,7 @@ static inline void ap_scan_domains(struct ap_card *ac)
 	unsigned int func;
 	struct device *dev;
 	struct ap_queue *aq;
-	int rc, dom, depth, type;
+	int rc, dom, depth, type, ml;
 
 	/*
 	 * Go through the configuration for the domains and compare them
@@ -1540,7 +1557,7 @@ static inline void ap_scan_domains(struct ap_card *ac)
 			continue;
 		}
 		/* domain is valid, get info from this APQN */
-		if (!ap_queue_info(qid, &type, &func, &depth, &decfg)) {
+		if (!ap_queue_info(qid, &type, &func, &depth, &ml, &decfg)) {
 			if (aq) {
 				AP_DBF_INFO(
 					"%s(%d,%d) ap_queue_info() not successful, rm queue device\n",
@@ -1639,7 +1656,7 @@ static inline void ap_scan_adapter(int ap)
 	unsigned int func;
 	struct device *dev;
 	struct ap_card *ac;
-	int rc, dom, depth, type, comp_type;
+	int rc, dom, depth, type, comp_type, ml;
 
 	/* Is there currently a card device for this adapter ? */
 	dev = bus_find_device(&ap_bus_type, NULL,
@@ -1668,7 +1685,8 @@ static inline void ap_scan_adapter(int ap)
 	for (dom = 0; dom <= ap_max_domain_id; dom++)
 		if (ap_test_config_usage_domain(dom)) {
 			qid = AP_MKQID(ap, dom);
-			if (ap_queue_info(qid, &type, &func, &depth, &decfg))
+			if (ap_queue_info(qid, &type, &func,
+					  &depth, &ml, &decfg))
 				break;
 		}
 	if (dom > ap_max_domain_id) {
@@ -1737,7 +1755,7 @@ static inline void ap_scan_adapter(int ap)
 				    __func__, ap, type);
 			return;
 		}
-		ac = ap_card_create(ap, depth, type, comp_type, func);
+		ac = ap_card_create(ap, depth, type, comp_type, func, ml);
 		if (!ac) {
 			AP_DBF_WARN("%s(%d) ap_card_create() failed\n",
 				    __func__, ap);
@@ -1748,6 +1766,12 @@ static inline void ap_scan_adapter(int ap)
 		dev->bus = &ap_bus_type;
 		dev->parent = ap_root_device;
 		dev_set_name(dev, "card%02x", ap);
+		/* maybe enlarge ap_max_msg_size to support this card */
+		if (ac->maxmsgsize > atomic_read(&ap_max_msg_size)) {
+			atomic_set(&ap_max_msg_size, ac->maxmsgsize);
+			AP_DBF_INFO("%s(%d) ap_max_msg_size update to %d byte\n",
+				    __func__, ap, atomic_read(&ap_max_msg_size));
+		}
 		/* Register the new card device with AP bus */
 		rc = device_register(dev);
 		if (rc) {

drivers/s390/crypto/ap_bus.h

@@ -25,8 +25,11 @@
 #define AP_RESET_TIMEOUT (HZ*0.7)	/* Time in ticks for reset timeouts. */
 #define AP_CONFIG_TIME 30	/* Time in seconds between AP bus rescans. */
 #define AP_POLL_TIME 1		/* Time in ticks between receive polls. */
+#define AP_DEFAULT_MAX_MSG_SIZE (12 * 1024)
+#define AP_TAPQ_ML_FIELD_CHUNK_SIZE (4096)
 
 extern int ap_domain_index;
+extern atomic_t ap_max_msg_size;
 
 extern DECLARE_HASHTABLE(ap_queues, 8);
 extern spinlock_t ap_queues_lock;
@@ -167,6 +170,7 @@ struct ap_card {
 	unsigned int functions;		/* AP device function bitfield. */
 	int queue_depth;		/* AP queue depth.*/
 	int id;				/* AP card number. */
+	unsigned int maxmsgsize;	/* AP msg limit for this card */
 	bool config;			/* configured state */
 	atomic64_t total_request_count;	/* # requests ever for this AP device.*/
 };
@@ -228,7 +232,8 @@ struct ap_message {
 	struct list_head list;		/* Request queueing. */
 	unsigned long long psmid;	/* Message id. */
 	void *msg;			/* Pointer to message buffer. */
-	unsigned int len;		/* Message length. */
+	unsigned int len;		/* actual msg len in msg buffer */
+	unsigned int bufsize;		/* allocated msg buffer size */
 	u16 flags;			/* Flags, see AP_MSG_FLAG_xxx */
 	struct ap_fi fi;		/* Failure Injection cmd */
 	int rc;				/* Return code for this message */
@@ -290,8 +295,8 @@ void ap_queue_prepare_remove(struct ap_queue *aq);
 void ap_queue_remove(struct ap_queue *aq);
 void ap_queue_init_state(struct ap_queue *aq);
 
-struct ap_card *ap_card_create(int id, int queue_depth, int raw_device_type,
-			       int comp_device_type, unsigned int functions);
+struct ap_card *ap_card_create(int id, int queue_depth, int raw_type,
+			       int comp_type, unsigned int functions, int ml);
 
 struct ap_perms {
 	unsigned long ioctlm[BITS_TO_LONGS(AP_IOCTLS)];

drivers/s390/crypto/ap_card.c

@@ -174,6 +174,16 @@ static ssize_t config_store(struct device *dev,
 
 static DEVICE_ATTR_RW(config);
 
+static ssize_t max_msg_size_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct ap_card *ac = to_ap_card(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%u\n", ac->maxmsgsize);
+}
+
+static DEVICE_ATTR_RO(max_msg_size);
+
 static struct attribute *ap_card_dev_attrs[] = {
 	&dev_attr_hwtype.attr,
 	&dev_attr_raw_hwtype.attr,
@@ -184,6 +194,7 @@ static struct attribute *ap_card_dev_attrs[] = {
 	&dev_attr_pendingq_count.attr,
 	&dev_attr_modalias.attr,
 	&dev_attr_config.attr,
+	&dev_attr_max_msg_size.attr,
 	NULL
 };
 
@@ -209,7 +220,7 @@ static void ap_card_device_release(struct device *dev)
 }
 
 struct ap_card *ap_card_create(int id, int queue_depth, int raw_type,
-			       int comp_type, unsigned int functions)
+			       int comp_type, unsigned int functions, int ml)
 {
 	struct ap_card *ac;
 
@@ -223,5 +234,8 @@ struct ap_card *ap_card_create(int id, int queue_depth, int raw_type,
 	ac->queue_depth = queue_depth;
 	ac->functions = functions;
 	ac->id = id;
+	ac->maxmsgsize = ml > 0 ?
+		ml * AP_TAPQ_ML_FIELD_CHUNK_SIZE : AP_DEFAULT_MAX_MSG_SIZE;
+
 	return ac;
 }

drivers/s390/crypto/ap_queue.c

@@ -101,7 +101,7 @@ int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length)
 
 	if (msg == NULL)
 		return -EINVAL;
-	status = ap_dqap(qid, psmid, msg, length);
+	status = ap_dqap(qid, psmid, msg, length, NULL, NULL);
 	switch (status.response_code) {
 	case AP_RESPONSE_NORMAL:
 		return 0;
@@ -136,9 +136,24 @@ static struct ap_queue_status ap_sm_recv(struct ap_queue *aq)
 	struct ap_queue_status status;
 	struct ap_message *ap_msg;
 	bool found = false;
+	size_t reslen;
+	unsigned long resgr0 = 0;
+	int parts = 0;
 
+	/*
+	 * DQAP loop until response code and resgr0 indicate that
+	 * the msg is totally received. As we use the very same buffer
+	 * the msg is overwritten with each invocation. That's intended
+	 * and the receiver of the msg is informed with a msg rc code
+	 * of EMSGSIZE in such a case.
+	 */
+	do {
 		status = ap_dqap(aq->qid, &aq->reply->psmid,
-			 aq->reply->msg, aq->reply->len);
+				 aq->reply->msg, aq->reply->bufsize,
+				 &reslen, &resgr0);
+		parts++;
+	} while (status.response_code == 0xFF && resgr0 != 0);
+
 	switch (status.response_code) {
 	case AP_RESPONSE_NORMAL:
 		aq->queue_count = max_t(int, 0, aq->queue_count - 1);
@@ -150,7 +165,12 @@ static struct ap_queue_status ap_sm_recv(struct ap_queue *aq)
 				continue;
 			list_del_init(&ap_msg->list);
 			aq->pendingq_count--;
+			if (parts > 1) {
+				ap_msg->rc = -EMSGSIZE;
+				ap_msg->receive(aq, ap_msg, NULL);
+			} else {
 				ap_msg->receive(aq, ap_msg, aq->reply);
+			}
 			found = true;
 			break;
 		}

drivers/s390/crypto/zcrypt_api.c

@@ -900,6 +900,9 @@ static long _zcrypt_send_cprb(bool userspace, struct ap_perms *perms,
 		if (xcRB->user_defined != AUTOSELECT &&
 		    xcRB->user_defined != zc->card->id)
 			continue;
+		/* check if request size exceeds card max msg size */
+		if (ap_msg.len > zc->card->maxmsgsize)
+			continue;
 		/* check if device node has admission for this card */
 		if (!zcrypt_check_card(perms, zc->card->id))
 			continue;
@@ -1068,6 +1071,9 @@ static long _zcrypt_send_ep11_cprb(bool userspace, struct ap_perms *perms,
 		if (targets &&
 		    !is_desired_ep11_card(zc->card->id, target_num, targets))
 			continue;
+		/* check if request size exceeds card max msg size */
+		if (ap_msg.len > zc->card->maxmsgsize)
+			continue;
 		/* check if device node has admission for this card */
 		if (!zcrypt_check_card(perms, zc->card->id))
 			continue;

drivers/s390/crypto/zcrypt_cex4.c

@@ -28,9 +28,6 @@
 #define CEX4C_MIN_MOD_SIZE	 16	/*  256 bits	*/
 #define CEX4C_MAX_MOD_SIZE	512	/* 4096 bits	*/
 
-#define CEX4A_MAX_MESSAGE_SIZE	MSGTYPE50_CRB3_MAX_MSG_SIZE
-#define CEX4C_MAX_MESSAGE_SIZE	MSGTYPE06_MAX_MSG_SIZE
-
 /* Waiting time for requests to be processed.
  * Currently there are some types of request which are not deterministic.
  * But the maximum time limit managed by the stomper code is set to 60sec.
@@ -605,19 +602,19 @@ static int zcrypt_cex4_queue_probe(struct ap_device *ap_dev)
 	int rc;
 
 	if (ap_test_bit(&aq->card->functions, AP_FUNC_ACCEL)) {
-		zq = zcrypt_queue_alloc(CEX4A_MAX_MESSAGE_SIZE);
+		zq = zcrypt_queue_alloc(aq->card->maxmsgsize);
 		if (!zq)
 			return -ENOMEM;
 		zq->ops = zcrypt_msgtype(MSGTYPE50_NAME,
 					 MSGTYPE50_VARIANT_DEFAULT);
 	} else if (ap_test_bit(&aq->card->functions, AP_FUNC_COPRO)) {
-		zq = zcrypt_queue_alloc(CEX4C_MAX_MESSAGE_SIZE);
+		zq = zcrypt_queue_alloc(aq->card->maxmsgsize);
 		if (!zq)
 			return -ENOMEM;
 		zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
 					 MSGTYPE06_VARIANT_DEFAULT);
 	} else if (ap_test_bit(&aq->card->functions, AP_FUNC_EP11)) {
-		zq = zcrypt_queue_alloc(CEX4C_MAX_MESSAGE_SIZE);
+		zq = zcrypt_queue_alloc(aq->card->maxmsgsize);
 		if (!zq)
 			return -ENOMEM;
 		zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,

drivers/s390/crypto/zcrypt_msgtype50.c

@@ -442,11 +442,13 @@ static void zcrypt_cex2a_receive(struct ap_queue *aq,
 		goto out;	/* ap_msg->rc indicates the error */
 	t80h = reply->msg;
 	if (t80h->type == TYPE80_RSP_CODE) {
-		if (aq->ap_dev.device_type == AP_DEVICE_TYPE_CEX2A)
-			len = min_t(int, CEX2A_MAX_RESPONSE_SIZE, t80h->len);
-		else
-			len = min_t(int, CEX3A_MAX_RESPONSE_SIZE, t80h->len);
+		len = t80h->len;
+		if (len > reply->bufsize || len > msg->bufsize) {
+			msg->rc = -EMSGSIZE;
+		} else {
 			memcpy(msg->msg, reply->msg, len);
+			msg->len = len;
+		}
 	} else
 		memcpy(msg->msg, reply->msg, sizeof(error_reply));
 out:
@@ -469,10 +471,9 @@ static long zcrypt_cex2a_modexpo(struct zcrypt_queue *zq,
 	struct completion work;
 	int rc;
 
-	if (zq->zcard->user_space_type == ZCRYPT_CEX2A)
-		ap_msg->msg = kmalloc(MSGTYPE50_CRB2_MAX_MSG_SIZE, GFP_KERNEL);
-	else
-		ap_msg->msg = kmalloc(MSGTYPE50_CRB3_MAX_MSG_SIZE, GFP_KERNEL);
+	ap_msg->bufsize = (zq->zcard->user_space_type == ZCRYPT_CEX2A) ?
+		MSGTYPE50_CRB2_MAX_MSG_SIZE : MSGTYPE50_CRB3_MAX_MSG_SIZE;
+	ap_msg->msg = kmalloc(ap_msg->bufsize, GFP_KERNEL);
 	if (!ap_msg->msg)
 		return -ENOMEM;
 	ap_msg->receive = zcrypt_cex2a_receive;
@@ -515,10 +516,9 @@ static long zcrypt_cex2a_modexpo_crt(struct zcrypt_queue *zq,
 	struct completion work;
 	int rc;
 
-	if (zq->zcard->user_space_type == ZCRYPT_CEX2A)
-		ap_msg->msg = kmalloc(MSGTYPE50_CRB2_MAX_MSG_SIZE, GFP_KERNEL);
-	else
-		ap_msg->msg = kmalloc(MSGTYPE50_CRB3_MAX_MSG_SIZE, GFP_KERNEL);
+	ap_msg->bufsize = (zq->zcard->user_space_type == ZCRYPT_CEX2A) ?
+		MSGTYPE50_CRB2_MAX_MSG_SIZE : MSGTYPE50_CRB3_MAX_MSG_SIZE;
+	ap_msg->msg = kmalloc(ap_msg->bufsize, GFP_KERNEL);
 	if (!ap_msg->msg)
 		return -ENOMEM;
 	ap_msg->receive = zcrypt_cex2a_receive;

drivers/s390/crypto/zcrypt_msgtype6.h

@@ -19,8 +19,6 @@
 #define MSGTYPE06_VARIANT_NORNG		1
 #define MSGTYPE06_VARIANT_EP11		2
 
-#define MSGTYPE06_MAX_MSG_SIZE		(12*1024)
-
 /**
  * The type 6 message family is associated with CEXxC/CEXxP cards.
  *

drivers/s390/crypto/zcrypt_queue.c

@@ -111,17 +111,17 @@ bool zcrypt_queue_force_online(struct zcrypt_queue *zq, int online)
 	return false;
 }
 
-struct zcrypt_queue *zcrypt_queue_alloc(size_t max_response_size)
+struct zcrypt_queue *zcrypt_queue_alloc(size_t reply_buf_size)
 {
 	struct zcrypt_queue *zq;
 
 	zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL);
 	if (!zq)
 		return NULL;
-	zq->reply.msg = kmalloc(max_response_size, GFP_KERNEL);
+	zq->reply.msg = kmalloc(reply_buf_size, GFP_KERNEL);
 	if (!zq->reply.msg)
 		goto out_free;
-	zq->reply.len = max_response_size;
+	zq->reply.bufsize = reply_buf_size;
 	INIT_LIST_HEAD(&zq->list);
 	kref_init(&zq->refcount);
 	return zq;

include/linux/cpuhotplug.h

@@ -171,7 +171,6 @@ enum cpuhp_state {
 	CPUHP_AP_PERF_X86_CSTATE_ONLINE,
 	CPUHP_AP_PERF_X86_IDXD_ONLINE,
 	CPUHP_AP_PERF_S390_CF_ONLINE,
-	CPUHP_AP_PERF_S390_CFD_ONLINE,
 	CPUHP_AP_PERF_S390_SF_ONLINE,
 	CPUHP_AP_PERF_ARM_CCI_ONLINE,
 	CPUHP_AP_PERF_ARM_CCN_ONLINE,