linux-kernel - [PATCH V9 38/45] memremap_pages: Reserve a PKS pkey for eventual use by PMEM

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Message-Id: <20220310172019.850939-39-ira.weiny@intel.com>
Date:   Thu, 10 Mar 2022 09:20:12 -0800
From:   ira.weiny@...el.com
To:     Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dan Williams <dan.j.williams@...el.com>
Cc:     Ira Weiny <ira.weiny@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH V9 38/45] memremap_pages: Reserve a PKS pkey for eventual use by PMEM

From: Ira Weiny <ira.weiny@...el.com>

Reserve a pkey for use by the memmap facility and set the default
protections to Access Disabled.

Signed-off-by: Ira Weiny <ira.weiny@...el.com>

---
Changes for V9
	Adjust for new key allocation
	From Dave Hansen
		use pkey
---
 include/linux/pks-keys.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/pks-keys.h b/include/linux/pks-keys.h
index f7e82e462659..32075ac54964 100644
--- a/include/linux/pks-keys.h
+++ b/include/linux/pks-keys.h
@@ -61,7 +61,9 @@
 /* PKS_KEY_DEFAULT must be 0 */
 #define PKS_KEY_DEFAULT		0
 #define PKS_KEY_TEST		PKS_NEW_KEY(PKS_KEY_DEFAULT, CONFIG_PKS_TEST)
-#define PKS_KEY_MAX		PKS_NEW_KEY(PKS_KEY_TEST, 1)
+#define PKS_KEY_PGMAP_PROTECTION \
+		PKS_NEW_KEY(PKS_KEY_TEST, CONFIG_DEVMAP_ACCESS_PROTECTION)
+#define PKS_KEY_MAX		PKS_NEW_KEY(PKS_KEY_PGMAP_PROTECTION, 1)
 
 #ifdef CONFIG_PKS_TEST_ALL_KEYS
 #undef PKS_KEY_MAX
@@ -72,6 +74,8 @@
 #define PKS_KEY_DEFAULT_INIT	PKS_DECLARE_INIT_VALUE(PKS_KEY_DEFAULT, RW, 1)
 #define PKS_KEY_TEST_INIT	PKS_DECLARE_INIT_VALUE(PKS_KEY_TEST, AD, \
 							CONFIG_PKS_TEST)
+#define PKS_KEY_PGMAP_INIT	PKS_DECLARE_INIT_VALUE(PKS_KEY_PGMAP_PROTECTION, \
+					AD, CONFIG_DEVMAP_ACCESS_PROTECTION)
 
 #define PKS_ALL_AD_MASK \
 	GENMASK(PKS_NUM_PKEYS * PKR_BITS_PER_PKEY, \
@@ -79,7 +83,8 @@
 
 #define PKS_INIT_VALUE ((PKS_ALL_AD & PKS_ALL_AD_MASK) | \
 			PKS_KEY_DEFAULT_INIT | \
-			PKS_KEY_TEST_INIT \
+			PKS_KEY_TEST_INIT | \
+			PKS_KEY_PGMAP_INIT \
 			)
 
 #endif /* CONFIG_ARCH_ENABLE_SUPERVISOR_PKEYS */
-- 
2.35.1