linux-kernel - [PATCH v9 5/5] KVM: arm64: Introduce the PTDUMP_STAGE2

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Message-ID: <20240827084549.45731-6-sebastianene@google.com>
Date: Tue, 27 Aug 2024 08:45:48 +0000
From: Sebastian Ene <sebastianene@...gle.com>
To: akpm@...ux-foundation.org, alexghiti@...osinc.com, ankita@...dia.com, 
	ardb@...nel.org, catalin.marinas@....com, christophe.leroy@...roup.eu, 
	james.morse@....com, vdonnefort@...gle.com, mark.rutland@....com, 
	maz@...nel.org, oliver.upton@...ux.dev, rananta@...gle.com, 
	ryan.roberts@....com, sebastianene@...gle.com, shahuang@...hat.com, 
	suzuki.poulose@....com, will@...nel.org, yuzenghui@...wei.com
Cc: kvmarm@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, kernel-team@...roid.com
Subject: [PATCH v9 5/5] KVM: arm64: Introduce the PTDUMP_STAGE2_DEBUGFS config

When this config is enabled, it exposes the stage-2 pagetable layout
through a debugfs file.

Signed-off-by: Sebastian Ene <sebastianene@...gle.com>
---
 arch/arm64/kvm/Kconfig | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index 8304eb342be9..ead632ad01b4 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -66,4 +66,21 @@ config PROTECTED_NVHE_STACKTRACE
 
 	  If unsure, or not using protected nVHE (pKVM), say N.
 
+config PTDUMP_STAGE2_DEBUGFS
+	bool "Present the stage-2 pagetables to debugfs"
+	depends on KVM
+	depends on DEBUG_KERNEL
+	depends on DEBUG_FS
+	depends on GENERIC_PTDUMP
+	select PTDUMP_CORE
+	default n
+	help
+	  Say Y here if you want to show the stage-2 kernel pagetables
+	  layout in a debugfs file. This information is only useful for kernel developers
+	  who are working in architecture specific areas of the kernel.
+	  It is probably not a good idea to enable this feature in a production
+	  kernel.
+
+	  If in doubt, say N.
+
 endif # VIRTUALIZATION
-- 
2.46.0.295.g3b9ea8a38a-goog