From 1f404058e2911afe08417ef82f17aba6adccfc63 Mon Sep 17 00:00:00 2001
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Date: Thu, 9 Jul 2020 08:59:28 +0530
Subject: [PATCH] powerpc/book3s64/pkeys: Explain key 1 reservation details
References: jsc#SLE-16556 bsc#1078248 FATE#322447
Patch-mainline: v5.9-rc1
Git-commit: 1f404058e2911afe08417ef82f17aba6adccfc63
This explains the details w.r.t key 1.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200709032946.881753-6-aneesh.kumar@linux.ibm.com
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/mm/book3s64/pkeys.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/mm/book3s64/pkeys.c b/arch/powerpc/mm/book3s64/pkeys.c
index 82ace6acb0aa..ee27f18fac32 100644
--- a/arch/powerpc/mm/book3s64/pkeys.c
+++ b/arch/powerpc/mm/book3s64/pkeys.c
@@ -128,7 +128,10 @@ static int pkey_initialize(void)
#else
os_reserved = 0;
#endif
- /* Bits are in LE format. */
+ /*
+ * key 1 is recommended not to be used. PowerISA(3.0) page 1015,
+ * programming note.
+ */
reserved_allocation_mask = (0x1 << 1) | (0x1 << execute_only_key);
/* register mask is in BE format */
--
2.26.2