[PATCH v5 12/12] arm64: mm: Display guarded pages in ptdump

Mark Brown
2020-01-22T21:22:26Z

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: Catalin Marinas <catalin.marinas@arm.com>
---
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 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),
--
2.20.1