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

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Message-Id: <20240731-kvm-arm64-fgt-doc-v1-2-abb364f8fe57@kernel.org>
Date: Wed, 31 Jul 2024 19:58:38 +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 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..1d8745740fb1 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 which enable traps when set
+ * _nMASK: Bits which disable traps when set
  */
 #define __HFGRTR_EL2_RES0	HFGxTR_EL2_RES0
 #define __HFGRTR_EL2_MASK	GENMASK(49, 0)

-- 
2.39.2