linux-kernel - [PATCH v2 3/3] arm64: smp: Disable priority masking when NMI is enable on PSR.I section

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Date:   Wed,  4 Nov 2020 17:05:39 +0900
From:   Yuichi Ito <ito-yuichi@...itsu.com>
To:     maz@...nel.org, sumit.garg@...aro.org, tglx@...utronix.de,
        jason@...edaemon.net, catalin.marinas@....com, will@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Yuichi Ito <ito-yuichi@...itsu.com>
Subject: [PATCH v2 3/3] arm64: smp: Disable priority masking when NMI is enable on PSR.I section

It should be prohibitted to use priority masking in NMI context.

Using local_irq_disable() under the above conditions causes a WARNING.
Then, there will be also a mismatch between the PSR.I values and PMR GIC_PRIO_PSR_I_SET.

Signed-off-by: Yuichi Ito <ito-yuichi@...itsu.com>
---
 arch/arm64/kernel/smp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index fd59bc7..3c49f06 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -872,7 +872,9 @@ static void ipi_cpu_crash_stop(unsigned int cpu, struct pt_regs *regs)
 
 	atomic_dec(&waiting_for_crash_ipi);
 
-	local_irq_disable();
+	if(!in_nmi())
+		local_irq_disable();
+
 	sdei_mask_local_cpu();
 
 	if (IS_ENABLED(CONFIG_HOTPLUG_CPU))
-- 
1.8.3.1