linux-kernel - [PATCH v2 2/2] KVM: arm64: Clarify meaning of _MASK and

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Message-Id: <20240802-kvm-arm64-fgt-doc-v2-2-b90183df14f6@kernel.org>
Date: Fri, 02 Aug 2024 16:37:34 +0100
From: Mark Brown <broonie@...nel.org>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
 James Morse <james.morse@....com>, 
 Suzuki K Poulose <suzuki.poulose@....com>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
 Fuad Tabba <tabba@...gle.com>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
 linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: [PATCH v2 2/2] KVM: arm64: Clarify meaning of _MASK and _nMASK for
 FGT registers

Since the use of _MASK to mean bits where setting the bit causes traps to
be generated is a little unusual add a clarifying comment.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 arch/arm64/include/asm/kvm_arm.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index d347483395b4..c2f387905d9c 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -343,6 +343,10 @@
  * FGT register definitions
  *
  * RES0 and polarity masks for the FGT registers.
+ *
+ * _RES0:  Bits which are RES0
+ * _MASK:  Bits with positive polarity
+ * _nMASK: Bits with negative polarity
  */
 #define __HFGRTR_EL2_RES0	HFGxTR_EL2_RES0
 #define __HFGRTR_EL2_MASK	GENMASK(49, 0)

-- 
2.39.2