From: Mark Brown <broonie@kernel.org>
Date: Mon, 16 Mar 2020 16:50:53 +0000 (+0000)
Subject: arm64: mm: Display guarded pages in ptdump
X-Git-Tag: v5.10.7~2348^2~9^2~16^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=de48bb369242fe17022fab3a2addc9c6dacad43f;p=platform%2Fkernel%2Flinux-rpi.git

arm64: mm: Display guarded pages in ptdump

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>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---

diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c
index 860c00e..78163b7 100644
--- a/arch/arm64/mm/dump.c
+++ b/arch/arm64/mm/dump.c
@@ -146,6 +146,11 @@ static const struct prot_bits pte_bits[] = {
 		.set	= "UXN",
 		.clear	= "   ",
 	}, {
+		.mask	= PTE_GP,
+		.val	= PTE_GP,
+		.set	= "GP",
+		.clear	= "  ",
+	}, {
 		.mask	= PTE_ATTRINDX_MASK,
 		.val	= PTE_ATTRINDX(MT_DEVICE_nGnRnE),
 		.set	= "DEVICE/nGnRnE",