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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/s390/kernel/nmi.c
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@@ -125,7 +125,7 @@
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 static notrace void s390_handle_damage(void)
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 {
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 	smp_emergency_stop();
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-	disabled_wait((unsigned long) __builtin_return_address(0));
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+	disabled_wait();
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 	while (1);
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 }
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 NOKPROBE_SYMBOL(s390_handle_damage);
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@@ -148,7 +148,6 @@
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 	local_mcck_disable();
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 	mcck = *this_cpu_ptr(&cpu_mcck);
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 	memset(this_cpu_ptr(&cpu_mcck), 0, sizeof(mcck));
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-	clear_cpu_flag(CIF_MCCK_PENDING);
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 	local_mcck_enable();
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 	local_irq_restore(flags);
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@@ -333,7 +332,7 @@
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 /*
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  * machine check handler.
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  */
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-void notrace s390_do_machine_check(struct pt_regs *regs)
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+int notrace s390_do_machine_check(struct pt_regs *regs)
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 {
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 	static int ipd_count;
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 	static DEFINE_SPINLOCK(ipd_lock);
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@@ -342,6 +341,7 @@
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 	unsigned long long tmp;
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 	union mci mci;
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 	unsigned long mcck_dam_code;
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+	int mcck_pending = 0;
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345
 
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 	nmi_enter();
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 	inc_irq_stat(NMI_NMI);
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@@ -400,7 +400,7 @@
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 		 */
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 		mcck->kill_task = 1;
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 		mcck->mcck_code = mci.val;
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-		set_cpu_flag(CIF_MCCK_PENDING);
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+		mcck_pending = 1;
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 	}
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405
 
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 	/*
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@@ -420,8 +420,7 @@
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 			mcck->stp_queue |= stp_sync_check();
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 		if (S390_lowcore.external_damage_code & (1U << ED_STP_ISLAND))
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 			mcck->stp_queue |= stp_island_check();
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-		if (mcck->stp_queue)
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-			set_cpu_flag(CIF_MCCK_PENDING);
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+		mcck_pending = 1;
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 	}
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 	/*
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@@ -442,12 +441,12 @@
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 	if (mci.cp) {
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 		/* Channel report word pending */
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 		mcck->channel_report = 1;
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-		set_cpu_flag(CIF_MCCK_PENDING);
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+		mcck_pending = 1;
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 	}
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 	if (mci.w) {
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 		/* Warning pending */
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 		mcck->warning = 1;
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-		set_cpu_flag(CIF_MCCK_PENDING);
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+		mcck_pending = 1;
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 	}
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 	/*
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@@ -462,7 +461,17 @@
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 		*((long *)(regs->gprs[15] + __SF_SIE_REASON)) = -EINTR;
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 	}
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 	clear_cpu_flag(CIF_MCCK_GUEST);
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+
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+	if (user_mode(regs) && mcck_pending) {
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+		nmi_exit();
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+		return 1;
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+	}
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+
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+	if (mcck_pending)
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+		schedule_mcck_handler();
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+
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 	nmi_exit();
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+	return 0;
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 }
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 NOKPROBE_SYMBOL(s390_do_machine_check);
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