Merge tag 's390-6.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull more s390 updates from Heiko Carstens:

 - Add empty command line parameter handling stubs to kernel for all
   command line parameters which are handled in the decompressor. This
   avoids invalid "Unknown kernel command line parameters" messages from
   the kernel, and also avoids that these will be incorrectly passed to
   user space. This caused already confusion, therefore add the empty
   stubs

 - Add missing phys_to_virt() handling to machine check handler

 - Introduce and use a union to be used for zcrypt inline assemblies.
   This makes sure that only a register wide member of the union is
   passed as input and output parameter to inline assemblies, while
   usual C code uses other members of the union to access bit fields of
   it

 - Add and use a READ_ONCE_ALIGNED_128() macro, which can be used to
   atomically read a 128-bit value from memory. This replaces the
   (mis-)use of the 128-bit cmpxchg operation to do the same in cpum_sf
   code. Currently gcc does not generate the used lpq instruction if
   __READ_ONCE() is used for aligned 128-bit accesses, therefore use
   this s390 specific helper

 - Simplify machine check handler code if a task needs to be killed
   because of e.g. register corruption due to a machine malfunction

 - Perform CPU reset to clear pending interrupts and TLB entries on an
   already stopped target CPU before delegating work to it

 - Generate arch/s390/boot/vmlinux.map link map for the decompressor,
   when CONFIG_VMLINUX_MAP is enabled for debugging purposes

 - Fix segment type handling for dcssblk devices. It incorrectly always
   returned type "READ/WRITE" even for read-only segements, which can
   result in a kernel panic if somebody tries to write to a read-only
   device

 - Sort config S390 select list again

 - Fix two kprobe reenter bugs revealed by a recently added kprobe kunit
   test

* tag 's390-6.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/kprobes: fix current_kprobe never cleared after kprobes reenter
  s390/kprobes: fix irq mask clobbering on kprobe reenter from post_handler
  s390/Kconfig: sort config S390 select list again
  s390/extmem: return correct segment type in __segment_load()
  s390/decompressor: add link map saving
  s390/smp: perform cpu reset before delegating work to target cpu
  s390/mcck: cleanup user process termination path
  s390/cpum_sf: use READ_ONCE_ALIGNED_128() instead of 128-bit cmpxchg
  s390/rwonce: add READ_ONCE_ALIGNED_128() macro
  s390/ap,zcrypt,vfio: introduce and use ap_queue_status_reg union
  s390/nmi: fix virtual-physical address confusion
  s390/setup: do not complain about parameters handled in decompressor

6 files changed, 30 insertions, 39 deletions

diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 59eba19ae0f2..d26f02495636 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -36,6 +36,23 @@
 
 int __bootdata(is_full_image);
 
+#define decompressor_handled_param(param)			\
+static int __init ignore_decompressor_param_##param(char *s)	\
+{								\
+	return 0;						\
+}								\
+early_param(#param, ignore_decompressor_param_##param)
+
+decompressor_handled_param(mem);
+decompressor_handled_param(vmalloc);
+decompressor_handled_param(dfltcc);
+decompressor_handled_param(noexec);
+decompressor_handled_param(facilities);
+decompressor_handled_param(nokaslr);
+#if IS_ENABLED(CONFIG_KVM)
+decompressor_handled_param(prot_virt);
+#endif
+
 static void __init reset_tod_clock(void)
 {
 	union tod_clock clk;
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index c8d8c9960936..76a06f3d3671 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -562,16 +562,6 @@ ENTRY(mcck_int_handler)
 	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
 	lgr	%r2,%r11		# pass pointer to pt_regs
 	brasl	%r14,s390_do_machine_check
-	cghi	%r2,0
-	je	.Lmcck_return
-	lg	%r1,__LC_KERNEL_STACK	# switch to kernel stack
-	mvc	STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11)
-	xc	__SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1)
-	la	%r11,STACK_FRAME_OVERHEAD(%r1)
-	lgr	%r2,%r11
-	lgr	%r15,%r1
-	brasl	%r14,s390_handle_mcck
-.Lmcck_return:
 	lctlg	%c1,%c1,__PT_CR1(%r11)
 	lmg	%r0,%r10,__PT_R0(%r11)
 	mvc	__LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW
diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c
index 5e713f318de3..7b41ceecbb25 100644
--- a/arch/s390/kernel/kprobes.c
+++ b/arch/s390/kernel/kprobes.c
@@ -278,6 +278,7 @@ static void pop_kprobe(struct kprobe_ctlblk *kcb)
 {
 	__this_cpu_write(current_kprobe, kcb->prev_kprobe.kp);
 	kcb->kprobe_status = kcb->prev_kprobe.status;
+	kcb->prev_kprobe.kp = NULL;
 }
 NOKPROBE_SYMBOL(pop_kprobe);
 
@@ -402,12 +403,11 @@ static int post_kprobe_handler(struct pt_regs *regs)
 	if (!p)
 		return 0;
 
+	resume_execution(p, regs);
 	if (kcb->kprobe_status != KPROBE_REENTER && p->post_handler) {
 		kcb->kprobe_status = KPROBE_HIT_SSDONE;
 		p->post_handler(p, regs, 0);
 	}
-
-	resume_execution(p, regs);
 	pop_kprobe(kcb);
 	preempt_enable_no_resched();
 
diff --git a/arch/s390/kernel/nmi.c b/arch/s390/kernel/nmi.c
index 5dbf274719a9..38ec0487521c 100644
--- a/arch/s390/kernel/nmi.c
+++ b/arch/s390/kernel/nmi.c
@@ -156,7 +156,7 @@ NOKPROBE_SYMBOL(s390_handle_damage);
  * Main machine check handler function. Will be called with interrupts disabled
  * and machine checks enabled.
  */
-void __s390_handle_mcck(void)
+void s390_handle_mcck(void)
 {
 	struct mcck_struct mcck;
 
@@ -192,23 +192,16 @@ void __s390_handle_mcck(void)
 	if (mcck.stp_queue)
 		stp_queue_work();
 	if (mcck.kill_task) {
-		local_irq_enable();
 		printk(KERN_EMERG "mcck: Terminating task because of machine "
 		       "malfunction (code 0x%016lx).\n", mcck.mcck_code);
 		printk(KERN_EMERG "mcck: task: %s, pid: %d.\n",
 		       current->comm, current->pid);
-		make_task_dead(SIGSEGV);
+		if (is_global_init(current))
+			panic("mcck: Attempting to kill init!\n");
+		do_send_sig_info(SIGKILL, SEND_SIG_PRIV, current, PIDTYPE_PID);
 	}
 }
 
-void noinstr s390_handle_mcck(struct pt_regs *regs)
-{
-	trace_hardirqs_off();
-	pai_kernel_enter(regs);
-	__s390_handle_mcck();
-	pai_kernel_exit(regs);
-	trace_hardirqs_on();
-}
 /*
  * returns 0 if register contents could be validated
  * returns 1 otherwise
@@ -346,8 +339,7 @@ static void notrace s390_backup_mcck_info(struct pt_regs *regs)
 	struct sie_page *sie_page;
 
 	/* r14 contains the sie block, which was set in sie64a */
-	struct kvm_s390_sie_block *sie_block =
-			(struct kvm_s390_sie_block *) regs->gprs[14];
+	struct kvm_s390_sie_block *sie_block = phys_to_virt(regs->gprs[14]);
 
 	if (sie_block == NULL)
 		/* Something's seriously wrong, stop system. */
@@ -374,7 +366,7 @@ NOKPROBE_SYMBOL(s390_backup_mcck_info);
 /*
  * machine check handler.
  */
-int notrace s390_do_machine_check(struct pt_regs *regs)
+void notrace s390_do_machine_check(struct pt_regs *regs)
 {
 	static int ipd_count;
 	static DEFINE_SPINLOCK(ipd_lock);
@@ -504,16 +496,10 @@ int notrace s390_do_machine_check(struct pt_regs *regs)
 	}
 	clear_cpu_flag(CIF_MCCK_GUEST);
 
-	if (user_mode(regs) && mcck_pending) {
-		irqentry_nmi_exit(regs, irq_state);
-		return 1;
-	}
-
 	if (mcck_pending)
 		schedule_mcck_handler();
 
 	irqentry_nmi_exit(regs, irq_state);
-	return 0;
 }
 NOKPROBE_SYMBOL(s390_do_machine_check);
 
diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c
index 79904a839fb9..e7b867e2f73f 100644
--- a/arch/s390/kernel/perf_cpum_sf.c
+++ b/arch/s390/kernel/perf_cpum_sf.c
@@ -1355,8 +1355,7 @@ static void hw_perf_event_update(struct perf_event *event, int flush_all)
 		num_sdb++;
 
 		/* Reset trailer (using compare-double-and-swap) */
-		/* READ_ONCE() 16 byte header */
-		prev.val = __cdsg(&te->header.val, 0, 0);
+		prev.val = READ_ONCE_ALIGNED_128(te->header.val);
 		do {
 			old.val = prev.val;
 			new.val = prev.val;
@@ -1558,8 +1557,7 @@ static bool aux_set_alert(struct aux_buffer *aux, unsigned long alert_index,
 	struct hws_trailer_entry *te;
 
 	te = aux_sdb_trailer(aux, alert_index);
-	/* READ_ONCE() 16 byte header */
-	prev.val = __cdsg(&te->header.val, 0, 0);
+	prev.val = READ_ONCE_ALIGNED_128(te->header.val);
 	do {
 		old.val = prev.val;
 		new.val = prev.val;
@@ -1637,8 +1635,7 @@ static bool aux_reset_buffer(struct aux_buffer *aux, unsigned long range,
 	idx_old = idx = aux->empty_mark + 1;
 	for (i = 0; i < range_scan; i++, idx++) {
 		te = aux_sdb_trailer(aux, idx);
-		/* READ_ONCE() 16 byte header */
-		prev.val = __cdsg(&te->header.val, 0, 0);
+		prev.val = READ_ONCE_ALIGNED_128(te->header.val);
 		do {
 			old.val = prev.val;
 			new.val = prev.val;
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 23c427284773..d4888453bbf8 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -333,6 +333,7 @@ static void pcpu_delegate(struct pcpu *pcpu,
 	}
 	/* Stop target cpu (if func returns this stops the current cpu). */
 	pcpu_sigp_retry(pcpu, SIGP_STOP, 0);
+	pcpu_sigp_retry(pcpu, SIGP_CPU_RESET, 0);
 	/* Restart func on the target cpu and stop the current cpu. */
 	if (lc) {
 		lc->restart_stack = stack;
@@ -522,7 +523,7 @@ static void smp_handle_ext_call(void)
 	if (test_bit(ec_call_function_single, &bits))
 		generic_smp_call_function_single_interrupt();
 	if (test_bit(ec_mcck_pending, &bits))
-		__s390_handle_mcck();
+		s390_handle_mcck();
 	if (test_bit(ec_irq_work, &bits))
 		irq_work_run();
 }