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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@kaod.org>,
        Nicholas Piggin <npiggin@gmail.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.12 305/363] powerpc/64s: Make NMI record implicitly soft-masked code as irqs disabled
Date:   Mon, 17 May 2021 16:02:51 +0200
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From: Nicholas Piggin <npiggin@gmail.com>

[ Upstream commit 4ec5feec1ad029bdf7d49bc50ccc0c195eeabe93 ]

scv support introduced the notion of code that implicitly soft-masks
irqs due to the instruction addresses. This is required because scv
enters the kernel with MSR[EE]=1.

If a NMI (including soft-NMI) interrupt hits when we are implicitly
soft-masked then its regs->softe does not reflect this because it is
derived from the explicit soft mask state (paca->irq_soft_mask). This
makes arch_irq_disabled_regs(regs) return false.

This can trigger a warning in the soft-NMI watchdog code (shown below).
Fix it by having NMI interrupts set regs->softe to disabled in case of
interrupting an implicit soft-masked region.

  ------------[ cut here ]------------
  WARNING: CPU: 41 PID: 1103 at arch/powerpc/kernel/watchdog.c:259 soft_nmi_interrupt+0x3e4/0x5f0
  CPU: 41 PID: 1103 Comm: (spawn) Not tainted
  NIP:  c000000000039534 LR: c000000000039234 CTR: c000000000009a00
  REGS: c000007fffbcf940 TRAP: 0700   Not tainted
  MSR:  9000000000021033 <SF,HV,ME,IR,DR,RI,LE>  CR: 22042482  XER: 200400ad
  CFAR: c000000000039260 IRQMASK: 3
  GPR00: c000000000039204 c000007fffbcfbe0 c000000001d6c300 0000000000000003
  GPR04: 00007ffffa45d078 0000000000000000 0000000000000008 0000000000000020
  GPR08: 0000007ffd4e0000 0000000000000000 c000007ffffceb00 7265677368657265
  GPR12: 9000000000009033 c000007ffffceb00 00000f7075bf4480 000000000000002a
  GPR16: 00000f705745a528 00007ffffa45ddd8 00000f70574d0008 0000000000000000
  GPR20: 00000f7075c58d70 00000f7057459c38 0000000000000001 0000000000000040
  GPR24: 0000000000000000 0000000000000029 c000000001dae058 0000000000000029
  GPR28: 0000000000000000 0000000000000800 0000000000000009 c000007fffbcfd60
  NIP [c000000000039534] soft_nmi_interrupt+0x3e4/0x5f0
  LR [c000000000039234] soft_nmi_interrupt+0xe4/0x5f0
  Call Trace:
  [c000007fffbcfbe0] [c000000000039204] soft_nmi_interrupt+0xb4/0x5f0 (unreliable)
  [c000007fffbcfcf0] [c00000000000c0e8] soft_nmi_common+0x138/0x1c4
  --- interrupt: 900 at end_real_trampolines+0x0/0x1000
  NIP:  c000000000003000 LR: 00007ca426adb03c CTR: 900000000280f033
  REGS: c000007fffbcfd60 TRAP: 0900
  MSR:  9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE>  CR: 44042482  XER: 200400ad
  CFAR: 00007ca426946020 IRQMASK: 0
  GPR00: 00000000000000ad 00007ffffa45d050 00007ca426b07f00 0000000000000035
  GPR04: 00007ffffa45d078 0000000000000000 0000000000000008 0000000000000020
  GPR08: 0000000000000000 0000000000100000 0000000010000000 00007ffffa45d110
  GPR12: 0000000000000001 00007ca426d4e680 00000f7075bf4480 000000000000002a
  GPR16: 00000f705745a528 00007ffffa45ddd8 00000f70574d0008 0000000000000000
  GPR20: 00000f7075c58d70 00000f7057459c38 0000000000000001 0000000000000040
  GPR24: 0000000000000000 00000f7057473f68 0000000000000003 000000000000041b
  GPR28: 00007ffffa45d4c4 0000000000000035 0000000000000000 00000f7057473f68
  NIP [c000000000003000] end_real_trampolines+0x0/0x1000
  LR [00007ca426adb03c] 0x7ca426adb03c
  --- interrupt: 900
  Instruction dump:
  60000000 60000000 60420000 38600001 482b3ae5 60000000 e93f0138 a36d0008
  7daa6b78 71290001 7f7907b4 4082fd34 <0fe00000> 4bfffd2c 60420000 ea6100a8
  ---[ end trace dc75f67d819779da ]---

Fixes: 118178e62e2e ("powerpc: move NMI entry/exit code into wrapper")
Reported-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210503111708.758261-1-npiggin@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/powerpc/include/asm/interrupt.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h
index e8d09a841373..31ed5356590a 100644
--- a/arch/powerpc/include/asm/interrupt.h
+++ b/arch/powerpc/include/asm/interrupt.h
@@ -138,6 +138,13 @@ static inline void interrupt_nmi_enter_prepare(struct pt_regs *regs, struct inte
 	local_paca->irq_soft_mask = IRQS_ALL_DISABLED;
 	local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
 
+	if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && !(regs->msr & MSR_PR) &&
+				regs->nip < (unsigned long)__end_interrupts) {
+		// Kernel code running below __end_interrupts is
+		// implicitly soft-masked.
+		regs->softe = IRQS_ALL_DISABLED;
+	}
+
 	/* Don't do any per-CPU operations until interrupt state is fixed */
 #endif
 	/* Allow DEC and PMI to be traced when they are soft-NMI */
-- 
2.30.2