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[v4,12/12] arm64: mm: Display guarded pages in ptdump

Message ID 20191211154206.46260-13-broonie@kernel.org
State New
Headers show
Series arm64: ARMv8.5-A: Branch Target Identification support | expand

Commit Message

Mark Brown Dec. 11, 2019, 3:42 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>

---
 arch/arm64/mm/dump.c | 5 +++++
 1 file changed, 5 insertions(+)

-- 
2.20.1
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Patch

diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c
index 0a920b538a89..880bd5160dc2 100644
--- a/arch/arm64/mm/dump.c
+++ b/arch/arm64/mm/dump.c
@@ -143,6 +143,11 @@  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),