diff mbox series

[v9,11/13] arm64: mm: Display guarded pages in ptdump

Message ID 20200311192608.40095-12-broonie@kernel.org (mailing list archive)
State New, archived
Headers show
Series arm64: Branch Target Identification support | expand

Commit Message

Mark Brown March 11, 2020, 7:26 p.m. UTC 
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(+)
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Patch

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),