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From:   Mark Brown <broonie@kernel.org>
To:     Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>
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        Mark Brown <broonie@kernel.org>
Subject: [PATCH v10 11/13] arm64: mm: Display guarded pages in ptdump
Date:   Mon, 16 Mar 2020 16:50:53 +0000
Message-Id: <20200316165055.31179-12-broonie@kernel.org>
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v8.5-BTI introduces the GP field in stage 1 translation tables which
indicates that blocks and pages with it set are guarded pages for which
branch target identification checks should be performed. Decode this
when dumping the page tables to aid debugging.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
---
 arch/arm64/mm/dump.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c
index 860c00ec8bd3..78163b7a7dde 100644
--- a/arch/arm64/mm/dump.c
+++ b/arch/arm64/mm/dump.c
@@ -145,6 +145,11 @@ static const struct prot_bits pte_bits[] = {
 		.val	= PTE_UXN,
 		.set	= "UXN",
 		.clear	= "   ",
+	}, {
+		.mask	= PTE_GP,
+		.val	= PTE_GP,
+		.set	= "GP",
+		.clear	= "  ",
 	}, {
 		.mask	= PTE_ATTRINDX_MASK,
 		.val	= PTE_ATTRINDX(MT_DEVICE_nGnRnE),
-- 
2.20.1