linux-kernel - [PATCH v2 3/9] arm64/nmi: Add Kconfig for NMI

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Date: Thu, 11 Apr 2024 06:48:52 +0000
From: Liao Chang <liaochang1@...wei.com>
To: <catalin.marinas@....com>, <will@...nel.org>, <maz@...nel.org>,
	<oliver.upton@...ux.dev>, <james.morse@....com>, <suzuki.poulose@....com>,
	<yuzenghui@...wei.com>, <tglx@...utronix.de>, <mark.rutland@....com>,
	<ardb@...nel.org>, <broonie@...nel.org>, <liaochang1@...wei.com>,
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	<frederic@...nel.org>, <reijiw@...gle.com>, <ruanjinjie@...wei.com>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<kvmarm@...ts.linux.dev>
Subject: [PATCH v2 3/9] arm64/nmi: Add Kconfig for NMI

From: Mark Brown <broonie@...nel.org>

Since NMI handling is in some fairly hot paths we provide a Kconfig option
which allows support to be compiled out when not needed.

Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Liao Chang <liaochang1@...wei.com>
---
 arch/arm64/Kconfig | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 7b11c98b3e84..c7d00d0cae9e 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -2095,6 +2095,23 @@ config ARM64_EPAN
 	  if the cpu does not implement the feature.
 endmenu # "ARMv8.7 architectural features"
 
+menu "ARMv8.8 architectural features"
+
+config ARM64_NMI
+	bool "Enable support for Non-maskable Interrupts (NMI)"
+	default y
+	help
+	  Non-maskable interrupts are an architecture and GIC feature
+	  which allow the system to configure some interrupts to be
+	  configured to have superpriority, allowing them to be handled
+	  before other interrupts and masked for shorter periods of time.
+
+	  The feature is detected at runtime, and will remain disabled
+	  if the cpu does not implement the feature. It will also be
+	  disabled if pseudo NMIs are enabled at runtime.
+
+endmenu # "ARMv8.8 architectural features"
+
 config ARM64_SVE
 	bool "ARM Scalable Vector Extension support"
 	default y
-- 
2.34.1