Merge tag 's390-5.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Vasily Gorbik: - Add support for ftrace with direct call and ftrace direct call samples. - Add support for kernel command lines longer than current 896 bytes and make its length configurable. - Add support for BEAR enhancement facility to improve last breaking event instruction tracking. - Add kprobes sanity checks and testcases to prevent kprobe in the mid of an instruction. - Allow concurrent access to /dev/hwc for the CPUMF users. - Various ftrace / jump label improvements. - Convert unwinder tests to KUnit. - Add s390_iommu_aperture kernel parameter to tweak the limits on concurrently usable DMA mappings. - Add ap.useirq AP module option which can be used to disable interrupt use. - Add add_disk() error handling support to block device drivers. - Drop arch specific and use generic implementation of strlcpy and strrchr. - Several __pa/__va usages fixes. - Various cio, crypto, pci, kernel doc and other small fixes and improvements all over the code. [ Merge fixup as per https://lore.kernel.org/all/YXAqZ%2FEszRisunQw@osiris/ ] * tag 's390-5.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (63 commits) s390: make command line configurable s390: support command lines longer than 896 bytes s390/kexec_file: move kernel image size check s390/pci: add s390_iommu_aperture kernel parameter s390/spinlock: remove incorrect kernel doc indicator s390/string: use generic strlcpy s390/string: use generic strrchr s390/ap: function rework based on compiler warning s390/cio: make ccw_device_dma_* more robust s390/vfio-ap: s390/crypto: fix all kernel-doc warnings s390/hmcdrv: fix kernel doc comments s390/ap: new module option ap.useirq s390/cpumf: Allow multiple processes to access /dev/hwc s390/bitops: return true/false (not 1/0) from bool functions s390: add support for BEAR enhancement facility s390: introduce nospec_uses_trampoline() s390: rename last_break to pgm_last_break s390/ptrace: add last_break member to pt_regs s390/sclp: sort out physical vs virtual pointers usage s390/setup: convert start and end initrd pointers to virtual ...
2026-01-06 12:30:45 -08:00 · 2021-11-06 14:48:06 -07:00
parent 0c5c62ddf8 622021cd6c
commit 0b707e572a
97 changed files with 1288 additions and 658 deletions
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4992,6 +4992,18 @@
 			an IOTLB flush. Default is lazy flushing before reuse,
 			which is faster.

+	s390_iommu_aperture=	[KNL,S390]
+			Specifies the size of the per device DMA address space
+			accessible through the DMA and IOMMU APIs as a decimal
+			factor of the size of main memory.
+			The default is 1 meaning that one can concurrently use
+			as many DMA addresses as physical memory is installed,
+			if supported by hardware, and thus map all of memory
+			once. With a value of 2 one can map all of memory twice
+			and so on. As a special case a factor of 0 imposes no
+			restrictions other than those given by hardware at the
+			cost of significant additional memory use for tables.
+
 	sa1100ir	[NET]
 			See drivers/net/irda/sa1100_ir.c.

--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -153,12 +153,15 @@ config S390
 	select HAVE_DEBUG_KMEMLEAK
 	select HAVE_DMA_CONTIGUOUS
 	select HAVE_DYNAMIC_FTRACE
+	select HAVE_DYNAMIC_FTRACE_WITH_ARGS
+	select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
 	select HAVE_DYNAMIC_FTRACE_WITH_REGS
 	select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 	select HAVE_EFFICIENT_UNALIGNED_ACCESS
 	select HAVE_FAST_GUP
 	select HAVE_FENTRY
 	select HAVE_FTRACE_MCOUNT_RECORD
+	select HAVE_FUNCTION_ARG_ACCESS_API
 	select HAVE_FUNCTION_ERROR_INJECTION
 	select HAVE_FUNCTION_GRAPH_TRACER
 	select HAVE_FUNCTION_TRACER
@@ -190,6 +193,7 @@ config S390
 	select HAVE_REGS_AND_STACK_ACCESS_API
 	select HAVE_RELIABLE_STACKTRACE
 	select HAVE_RSEQ
+	select HAVE_SAMPLE_FTRACE_DIRECT
 	select HAVE_SOFTIRQ_ON_OWN_STACK
 	select HAVE_SYSCALL_TRACEPOINTS
 	select HAVE_VIRT_CPU_ACCOUNTING
@@ -434,6 +438,14 @@ endchoice
 config 64BIT
 	def_bool y

+config COMMAND_LINE_SIZE
+	int "Maximum size of kernel command line"
+	default 4096
+	range 896 1048576
+	help
+	  This allows you to specify the maximum length of the kernel command
+	  line.
+
 config COMPAT
 	def_bool y
 	prompt "Kernel support for 31 bit emulation"
@@ -938,6 +950,8 @@ menu "Selftests"

 config S390_UNWIND_SELFTEST
 	def_tristate n
+	depends on KUNIT
+	default KUNIT_ALL_TESTS
 	prompt "Test unwind functions"
 	help
 	  This option enables s390 specific stack unwinder testing kernel
@@ -946,4 +960,16 @@ config S390_UNWIND_SELFTEST

 	  Say N if you are unsure.

+config S390_KPROBES_SANITY_TEST
+	def_tristate n
+	prompt "Enable s390 specific kprobes tests"
+	depends on KPROBES
+	depends on KUNIT
+	help
+	  This option enables an s390 specific kprobes test module. This option
+	  is not useful for distributions or general kernels, but only for kernel
+	  developers working on architecture code.
+
+	  Say N if you are unsure.
+
 endmenu
--- a/arch/s390/boot/compressed/decompressor.h
+++ b/arch/s390/boot/compressed/decompressor.h
@@ -24,6 +24,7 @@ struct vmlinux_info {
 	unsigned long dynsym_start;
 	unsigned long rela_dyn_start;
 	unsigned long rela_dyn_end;
+	unsigned long amode31_size;
 };

 /* Symbols defined by linker scripts */
--- a/arch/s390/boot/head.S
+++ b/arch/s390/boot/head.S
@@ -184,35 +184,23 @@ iplstart:
 	bas	%r14,.Lloader		# load parameter file
 	ltr	%r2,%r2 		# got anything ?
 	bz	.Lnopf
-	chi	%r2,895
-	bnh	.Lnotrunc
-	la	%r2,895
+	l	%r3,MAX_COMMAND_LINE_SIZE+ARCH_OFFSET-PARMAREA(%r12)
+	ahi	%r3,-1
+	clr	%r2,%r3
+	bl	.Lnotrunc
+	lr	%r2,%r3
 .Lnotrunc:
 	l	%r4,.Linitrd
 	clc	0(3,%r4),.L_hdr		# if it is HDRx
 	bz	.Lagain1		# skip dataset header
 	clc	0(3,%r4),.L_eof		# if it is EOFx
 	bz	.Lagain1		# skip dateset trailer
-	la	%r5,0(%r4,%r2)
-	lr	%r3,%r2
-	la	%r3,COMMAND_LINE-PARMAREA(%r12) # load adr. of command line
-	mvc	0(256,%r3),0(%r4)
-	mvc	256(256,%r3),256(%r4)
-	mvc	512(256,%r3),512(%r4)
-	mvc	768(122,%r3),768(%r4)
-	slr	%r0,%r0
-	b	.Lcntlp
-.Ldelspc:
-	ic	%r0,0(%r2,%r3)
-	chi	%r0,0x20		# is it a space ?
-	be	.Lcntlp
-	ahi	%r2,1
-	b	.Leolp
-.Lcntlp:
-	brct	%r2,.Ldelspc
-.Leolp:
-	slr	%r0,%r0
-	stc	%r0,0(%r2,%r3)		# terminate buffer
+
+	lr	%r5,%r2
+	la	%r6,COMMAND_LINE-PARMAREA(%r12)
+	lr	%r7,%r2
+	ahi	%r7,1
+	mvcl	%r6,%r4
 .Lnopf:

 #
@@ -317,6 +305,7 @@ SYM_CODE_START_LOCAL(startup_normal)
 	xc	0x300(256),0x300
 	xc	0xe00(256),0xe00
 	xc	0xf00(256),0xf00
+	lctlg	%c0,%c15,.Lctl-.LPG0(%r13)	# load control registers
 	stcke	__LC_BOOT_CLOCK
 	mvc	__LC_LAST_UPDATE_CLOCK(8),__LC_BOOT_CLOCK+1
 	spt	6f-.LPG0(%r13)
@@ -335,6 +324,22 @@ SYM_CODE_END(startup_normal)
 	.quad	0x0000000180000000,startup_pgm_check_handler
 .Lio_new_psw:
 	.quad	0x0002000180000000,0x1f0	# disabled wait
+.Lctl:	.quad	0x04040000		# cr0: AFP registers & secondary space
+	.quad	0			# cr1: primary space segment table
+	.quad	0			# cr2: dispatchable unit control table
+	.quad	0			# cr3: instruction authorization
+	.quad	0xffff			# cr4: instruction authorization
+	.quad	0			# cr5: primary-aste origin
+	.quad	0			# cr6:	I/O interrupts
+	.quad	0			# cr7:	secondary space segment table
+	.quad	0x0000000000008000	# cr8:	access registers translation
+	.quad	0			# cr9:	tracing off
+	.quad	0			# cr10: tracing off
+	.quad	0			# cr11: tracing off
+	.quad	0			# cr12: tracing off
+	.quad	0			# cr13: home space segment table
+	.quad	0xc0000000		# cr14: machine check handling off
+	.quad	0			# cr15: linkage stack operations

 #include "head_kdump.S"

@@ -377,11 +382,10 @@ SYM_DATA_START(parmarea)
 	.quad	0			# OLDMEM_BASE
 	.quad	0			# OLDMEM_SIZE
 	.quad	kernel_version		# points to kernel version string
+	.quad	COMMAND_LINE_SIZE

 	.org	COMMAND_LINE
 	.byte	"root=/dev/ram0 ro"
 	.byte	0
 	.org	PARMAREA+__PARMAREA_SIZE
 SYM_DATA_END(parmarea)
-
-	.org	HEAD_END
--- a/arch/s390/boot/ipl_parm.c
+++ b/arch/s390/boot/ipl_parm.c
@@ -170,10 +170,10 @@ static inline int has_ebcdic_char(const char *str)

 void setup_boot_command_line(void)
 {
-	parmarea.command_line[ARCH_COMMAND_LINE_SIZE - 1] = 0;
+	parmarea.command_line[COMMAND_LINE_SIZE - 1] = 0;
 	/* convert arch command line to ascii if necessary */
 	if (has_ebcdic_char(parmarea.command_line))
-		EBCASC(parmarea.command_line, ARCH_COMMAND_LINE_SIZE);
+		EBCASC(parmarea.command_line, COMMAND_LINE_SIZE);
 	/* copy arch command line */
 	strcpy(early_command_line, strim(parmarea.command_line));

--- a/arch/s390/boot/pgm_check_info.c
+++ b/arch/s390/boot/pgm_check_info.c
@@ -175,6 +175,6 @@ void print_pgm_check_info(void)
 			    gpregs[12], gpregs[13], gpregs[14], gpregs[15]);
 	print_stacktrace();
 	decompressor_printk("Last Breaking-Event-Address:\n");
-	decompressor_printk(" [<%016lx>] %pS\n", (unsigned long)S390_lowcore.breaking_event_addr,
-			    (void *)S390_lowcore.breaking_event_addr);
+	decompressor_printk(" [<%016lx>] %pS\n", (unsigned long)S390_lowcore.pgm_last_break,
+			    (void *)S390_lowcore.pgm_last_break);
 }
--- a/arch/s390/boot/startup.c
+++ b/arch/s390/boot/startup.c
@@ -15,6 +15,7 @@
 #include "uv.h"

 unsigned long __bootdata_preserved(__kaslr_offset);
+unsigned long __bootdata(__amode31_base);
 unsigned long __bootdata_preserved(VMALLOC_START);
 unsigned long __bootdata_preserved(VMALLOC_END);
 struct page *__bootdata_preserved(vmemmap);
@@ -259,6 +260,12 @@ static void offset_vmlinux_info(unsigned long offset)
 	vmlinux.dynsym_start += offset;
 }

+static unsigned long reserve_amode31(unsigned long safe_addr)
+{
+	__amode31_base = PAGE_ALIGN(safe_addr);
+	return safe_addr + vmlinux.amode31_size;
+}
+
 void startup_kernel(void)
 {
 	unsigned long random_lma;
@@ -273,6 +280,7 @@ void startup_kernel(void)
 	setup_lpp();
 	store_ipl_parmblock();
 	safe_addr = mem_safe_offset();
+	safe_addr = reserve_amode31(safe_addr);
 	safe_addr = read_ipl_report(safe_addr);
 	uv_query_info();
 	rescue_initrd(safe_addr);
--- a/arch/s390/configs/debug_defconfig
+++ b/arch/s390/configs/debug_defconfig
@@ -61,7 +61,8 @@ CONFIG_PROTECTED_VIRTUALIZATION_GUEST=y
 CONFIG_CMM=m
 CONFIG_APPLDATA_BASE=y
 CONFIG_KVM=m
-CONFIG_S390_UNWIND_SELFTEST=y
+CONFIG_S390_UNWIND_SELFTEST=m
+CONFIG_S390_KPROBES_SANITY_TEST=m
 CONFIG_KPROBES=y
 CONFIG_JUMP_LABEL=y
 CONFIG_STATIC_KEYS_SELFTEST=y
@@ -776,7 +777,6 @@ CONFIG_CRC8=m
 CONFIG_RANDOM32_SELFTEST=y
 CONFIG_DMA_CMA=y
 CONFIG_CMA_SIZE_MBYTES=0
-CONFIG_DMA_API_DEBUG=y
 CONFIG_PRINTK_TIME=y
 CONFIG_DYNAMIC_DEBUG=y
 CONFIG_DEBUG_INFO=y
@@ -839,8 +839,13 @@ CONFIG_BPF_KPROBE_OVERRIDE=y
 CONFIG_HIST_TRIGGERS=y
 CONFIG_FTRACE_STARTUP_TEST=y
 # CONFIG_EVENT_TRACE_STARTUP_TEST is not set
+CONFIG_SAMPLES=y
+CONFIG_SAMPLE_TRACE_PRINTK=m
+CONFIG_SAMPLE_FTRACE_DIRECT=m
 CONFIG_DEBUG_ENTRY=y
 CONFIG_CIO_INJECT=y
+CONFIG_KUNIT=m
+CONFIG_KUNIT_DEBUGFS=y
 CONFIG_NOTIFIER_ERROR_INJECTION=m
 CONFIG_NETDEV_NOTIFIER_ERROR_INJECT=m
 CONFIG_FAULT_INJECTION=y
--- a/arch/s390/configs/defconfig
+++ b/arch/s390/configs/defconfig
@@ -60,6 +60,7 @@ CONFIG_CMM=m
 CONFIG_APPLDATA_BASE=y
 CONFIG_KVM=m
 CONFIG_S390_UNWIND_SELFTEST=m
+CONFIG_S390_KPROBES_SANITY_TEST=m
 CONFIG_KPROBES=y
 CONFIG_JUMP_LABEL=y
 # CONFIG_GCC_PLUGINS is not set
@@ -788,6 +789,11 @@ CONFIG_FTRACE_SYSCALLS=y
 CONFIG_BLK_DEV_IO_TRACE=y
 CONFIG_BPF_KPROBE_OVERRIDE=y
 CONFIG_HIST_TRIGGERS=y
+CONFIG_SAMPLES=y
+CONFIG_SAMPLE_TRACE_PRINTK=m
+CONFIG_SAMPLE_FTRACE_DIRECT=m
+CONFIG_KUNIT=m
+CONFIG_KUNIT_DEBUGFS=y
 CONFIG_LKDTM=m
 CONFIG_PERCPU_TEST=m
 CONFIG_ATOMIC64_SELFTEST=y
--- a/arch/s390/include/asm/barrier.h
+++ b/arch/s390/include/asm/barrier.h
@@ -16,20 +16,24 @@

 #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
 /* Fast-BCR without checkpoint synchronization */
-#define __ASM_BARRIER "bcr 14,0\n"
+#define __ASM_BCR_SERIALIZE "bcr 14,0\n"
 #else
-#define __ASM_BARRIER "bcr 15,0\n"
+#define __ASM_BCR_SERIALIZE "bcr 15,0\n"
 #endif

-#define mb() do {  asm volatile(__ASM_BARRIER : : : "memory"); } while (0)
+static __always_inline void bcr_serialize(void)
+{
+	asm volatile(__ASM_BCR_SERIALIZE : : : "memory");
+}

-#define rmb()				barrier()
-#define wmb()				barrier()
-#define dma_rmb()			mb()
-#define dma_wmb()			mb()
-#define __smp_mb()			mb()
-#define __smp_rmb()			rmb()
-#define __smp_wmb()			wmb()
+#define mb()		bcr_serialize()
+#define rmb()		barrier()
+#define wmb()		barrier()
+#define dma_rmb()	mb()
+#define dma_wmb()	mb()
+#define __smp_mb()	mb()
+#define __smp_rmb()	rmb()
+#define __smp_wmb()	wmb()

 #define __smp_store_release(p, v)					\
 do {									\
--- a/arch/s390/include/asm/bitops.h
+++ b/arch/s390/include/asm/bitops.h
@@ -188,7 +188,7 @@ static inline bool arch_test_and_set_bit_lock(unsigned long nr,
 					      volatile unsigned long *ptr)
 {
 	if (arch_test_bit(nr, ptr))
-		return 1;
+		return true;
 	return arch_test_and_set_bit(nr, ptr);
 }

--- a/arch/s390/include/asm/cpu.h
+++ b/arch/s390/include/asm/cpu.h
@@ -12,6 +12,7 @@
 #ifndef __ASSEMBLY__

 #include <linux/types.h>
+#include <linux/jump_label.h>

 struct cpuid
 {
@@ -21,5 +22,7 @@ struct cpuid
 	unsigned int unused  : 16;
 } __attribute__ ((packed, aligned(8)));

+DECLARE_STATIC_KEY_FALSE(cpu_has_bear);
+
 #endif /* __ASSEMBLY__ */
 #endif /* _ASM_S390_CPU_H */
--- a/arch/s390/include/asm/debug.h
+++ b/arch/s390/include/asm/debug.h
@@ -462,7 +462,7 @@ arch_initcall(VNAME(var, reg))
 *
 * @var: Name of debug_info_t variable
 * @name: Name of debug log (e.g. used for debugfs entry)
- * @pages_per_area: Number of pages per area
+ * @pages: Number of pages per area
 * @nr_areas: Number of debug areas
 * @buf_size: Size of data area in each debug entry
 * @view: Pointer to debug view struct
--- a/arch/s390/include/asm/ftrace.h
+++ b/arch/s390/include/asm/ftrace.h
@@ -17,7 +17,6 @@

 void ftrace_caller(void);

-extern char ftrace_graph_caller_end;
 extern void *ftrace_func;

 struct dyn_arch_ftrace { };
@@ -42,6 +41,35 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr)
 	return addr;
 }

+struct ftrace_regs {
+	struct pt_regs regs;
+};
+
+static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
+{
+	return &fregs->regs;
+}
+
+static __always_inline void ftrace_instruction_pointer_set(struct ftrace_regs *fregs,
+							   unsigned long ip)
+{
+	struct pt_regs *regs = arch_ftrace_get_regs(fregs);
+
+	regs->psw.addr = ip;
+}
+
+/*
+ * When an ftrace registered caller is tracing a function that is
+ * also set by a register_ftrace_direct() call, it needs to be
+ * differentiated in the ftrace_caller trampoline. To do this,
+ * place the direct caller in the ORIG_GPR2 part of pt_regs. This
+ * tells the ftrace_caller that there's a direct caller.
+ */
+static inline void arch_ftrace_set_direct_caller(struct pt_regs *regs, unsigned long addr)
+{
+	regs->orig_gpr2 = addr;
+}
+
 /*
 * Even though the system call numbers are identical for s390/s390x a
 * different system call table is used for compat tasks. This may lead
@@ -68,4 +96,32 @@ static inline bool arch_syscall_match_sym_name(const char *sym,
 }

 #endif /* __ASSEMBLY__ */
+
+#ifdef CONFIG_FUNCTION_TRACER
+
+#define FTRACE_NOP_INSN .word 0xc004, 0x0000, 0x0000 /* brcl 0,0 */
+
+#ifndef CC_USING_HOTPATCH
+
+#define FTRACE_GEN_MCOUNT_RECORD(name)		\
+	.section __mcount_loc, "a", @progbits;	\
+	.quad name;				\
+	.previous;
+
+#else /* !CC_USING_HOTPATCH */
+
+#define FTRACE_GEN_MCOUNT_RECORD(name)
+
+#endif /* !CC_USING_HOTPATCH */
+
+#define FTRACE_GEN_NOP_ASM(name)		\
+	FTRACE_GEN_MCOUNT_RECORD(name)		\
+	FTRACE_NOP_INSN
+
+#else /* CONFIG_FUNCTION_TRACER */
+
+#define FTRACE_GEN_NOP_ASM(name)
+
+#endif /* CONFIG_FUNCTION_TRACER */
+
 #endif /* _ASM_S390_FTRACE_H */
--- a/arch/s390/include/asm/jump_label.h
+++ b/arch/s390/include/asm/jump_label.h
@@ -2,6 +2,8 @@
 #ifndef _ASM_S390_JUMP_LABEL_H
 #define _ASM_S390_JUMP_LABEL_H

+#define HAVE_JUMP_LABEL_BATCH
+
 #ifndef __ASSEMBLY__

 #include <linux/types.h>
--- a/arch/s390/include/asm/livepatch.h
+++ b/arch/s390/include/asm/livepatch.h
@@ -16,9 +16,7 @@

 static inline void klp_arch_set_pc(struct ftrace_regs *fregs, unsigned long ip)
 {
-	struct pt_regs *regs = ftrace_get_regs(fregs);
-
-	regs->psw.addr = ip;
+	ftrace_instruction_pointer_set(fregs, ip);
 }

 #endif
--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -65,7 +65,7 @@ struct lowcore {
 	__u32	external_damage_code;		/* 0x00f4 */
 	__u64	failing_storage_address;	/* 0x00f8 */
 	__u8	pad_0x0100[0x0110-0x0100];	/* 0x0100 */
-	__u64	breaking_event_addr;		/* 0x0110 */
+	__u64	pgm_last_break;			/* 0x0110 */
 	__u8	pad_0x0118[0x0120-0x0118];	/* 0x0118 */
 	psw_t	restart_old_psw;		/* 0x0120 */
 	psw_t	external_old_psw;		/* 0x0130 */
@@ -93,9 +93,10 @@ struct lowcore {
 	psw_t	return_psw;			/* 0x0290 */
 	psw_t	return_mcck_psw;		/* 0x02a0 */

+	__u64	last_break;			/* 0x02b0 */
+
 	/* CPU accounting and timing values. */
-	__u64	sys_enter_timer;		/* 0x02b0 */
-	__u8	pad_0x02b8[0x02c0-0x02b8];	/* 0x02b8 */
+	__u64	sys_enter_timer;		/* 0x02b8 */
 	__u64	mcck_enter_timer;		/* 0x02c0 */
 	__u64	exit_timer;			/* 0x02c8 */
 	__u64	user_timer;			/* 0x02d0 */
@@ -188,7 +189,7 @@ struct lowcore {
 	__u32	tod_progreg_save_area;		/* 0x1324 */
 	__u32	cpu_timer_save_area[2];		/* 0x1328 */
 	__u32	clock_comp_save_area[2];	/* 0x1330 */
-	__u8	pad_0x1338[0x1340-0x1338];	/* 0x1338 */
+	__u64	last_break_save_area;		/* 0x1338 */
 	__u32	access_regs_save_area[16];	/* 0x1340 */
 	__u64	cregs_save_area[16];		/* 0x1380 */
 	__u8	pad_0x1400[0x1800-0x1400];	/* 0x1400 */
--- a/arch/s390/include/asm/nospec-branch.h
+++ b/arch/s390/include/asm/nospec-branch.h
@@ -12,6 +12,11 @@ void nospec_init_branches(void);
 void nospec_auto_detect(void);
 void nospec_revert(s32 *start, s32 *end);

+static inline bool nospec_uses_trampoline(void)
+{
+	return __is_defined(CC_USING_EXPOLINE) && !nospec_disable;
+}
+
 #endif /* __ASSEMBLY__ */

 #endif /* _ASM_S390_EXPOLINE_H */
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -583,11 +583,11 @@ static inline void cspg(unsigned long *ptr, unsigned long old, unsigned long new
 #define CRDTE_DTT_REGION1	0x1cUL

 static inline void crdte(unsigned long old, unsigned long new,
-			 unsigned long table, unsigned long dtt,
+			 unsigned long *table, unsigned long dtt,
 			 unsigned long address, unsigned long asce)
 {
 	union register_pair r1 = { .even = old, .odd = new, };
-	union register_pair r2 = { .even = table | dtt, .odd = address, };
+	union register_pair r2 = { .even = __pa(table) | dtt, .odd = address, };

 	asm volatile(".insn rrf,0xb98f0000,%[r1],%[r2],%[asce],0"
 		     : [r1] "+&d" (r1.pair)
@@ -1001,7 +1001,7 @@ static __always_inline void __ptep_ipte(unsigned long address, pte_t *ptep,
 					unsigned long opt, unsigned long asce,
 					int local)
 {
-	unsigned long pto = (unsigned long) ptep;
+	unsigned long pto = __pa(ptep);

 	if (__builtin_constant_p(opt) && opt == 0) {
 		/* Invalidation + TLB flush for the pte */
@@ -1023,7 +1023,7 @@ static __always_inline void __ptep_ipte(unsigned long address, pte_t *ptep,
 static __always_inline void __ptep_ipte_range(unsigned long address, int nr,
 					      pte_t *ptep, int local)
 {
-	unsigned long pto = (unsigned long) ptep;
+	unsigned long pto = __pa(ptep);

 	/* Invalidate a range of ptes + TLB flush of the ptes */
 	do {
@@ -1487,7 +1487,7 @@ static __always_inline void __pmdp_idte(unsigned long addr, pmd_t *pmdp,
 {
 	unsigned long sto;

-	sto = (unsigned long) pmdp - pmd_index(addr) * sizeof(pmd_t);
+	sto = __pa(pmdp) - pmd_index(addr) * sizeof(pmd_t);
 	if (__builtin_constant_p(opt) && opt == 0) {
 		/* flush without guest asce */
 		asm volatile(
@@ -1513,7 +1513,7 @@ static __always_inline void __pudp_idte(unsigned long addr, pud_t *pudp,
 {
 	unsigned long r3o;

-	r3o = (unsigned long) pudp - pud_index(addr) * sizeof(pud_t);
+	r3o = __pa(pudp) - pud_index(addr) * sizeof(pud_t);
 	r3o |= _ASCE_TYPE_REGION3;
 	if (__builtin_constant_p(opt) && opt == 0) {
 		/* flush without guest asce */
--- a/arch/s390/include/asm/ptrace.h
+++ b/arch/s390/include/asm/ptrace.h
@@ -76,8 +76,7 @@ enum {
 * The pt_regs struct defines the way the registers are stored on
 * the stack during a system call.
 */
-struct pt_regs 
-{
+struct pt_regs {
 	union {
 		user_pt_regs user_regs;
 		struct {
@@ -97,6 +96,7 @@ struct pt_regs
 	};
 	unsigned long flags;
 	unsigned long cr1;
+	unsigned long last_break;
 };

 /*
@@ -197,6 +197,25 @@ const char *regs_query_register_name(unsigned int offset);
 unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset);
 unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n);

+/**
+ * regs_get_kernel_argument() - get Nth function argument in kernel
+ * @regs:	pt_regs of that context
+ * @n:		function argument number (start from 0)
+ *
+ * regs_get_kernel_argument() returns @n th argument of the function call.
+ */
+static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs,
+						     unsigned int n)
+{
+	unsigned int argoffset = STACK_FRAME_OVERHEAD / sizeof(long);
+
+#define NR_REG_ARGUMENTS 5
+	if (n < NR_REG_ARGUMENTS)
+		return regs_get_register(regs, 2 + n);
+	n -= NR_REG_ARGUMENTS;
+	return regs_get_kernel_stack_nth(regs, argoffset + n);
+}
+
 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
 {
 	return regs->gprs[15];
--- a/Show More
+++ b/Show More