linux-kernel - [PATCH V10 29/44] memremap_pages: Reserve a PKS pkey for eventual use by PMEM

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Date:   Tue, 19 Apr 2022 10:06:34 -0700
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 V10 29/44] 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 V10
	This patch now reserves a key before the PKS testing does.  So
	adjust for this being the only key at this point in the series.

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 c914afecb2d3..4e63c8061e55 100644
--- a/include/linux/pks-keys.h
+++ b/include/linux/pks-keys.h
@@ -60,17 +60,22 @@
 
 /* PKS_KEY_DEFAULT must be 0 */
 #define PKS_KEY_DEFAULT		0
-#define PKS_KEY_MAX		PKS_NEW_KEY(PKS_KEY_DEFAULT, 1)
+#define PKS_KEY_PGMAP_PROTECTION \
+		PKS_NEW_KEY(PKS_KEY_DEFAULT, CONFIG_DEVMAP_ACCESS_PROTECTION)
+#define PKS_KEY_MAX		PKS_NEW_KEY(PKS_KEY_PGMAP_PROTECTION, 1)
 
 /* PKS_KEY_DEFAULT_INIT must be RW */
 #define PKS_KEY_DEFAULT_INIT	PKS_DECLARE_INIT_VALUE(PKS_KEY_DEFAULT, RW, 1)
+#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, \
 		PKS_KEY_MAX * PKR_BITS_PER_PKEY)
 
 #define PKS_INIT_VALUE ((PKS_ALL_AD & PKS_ALL_AD_MASK) | \
-			PKS_KEY_DEFAULT_INIT \
+			PKS_KEY_DEFAULT_INIT | \
+			PKS_KEY_PGMAP_INIT \
 			)
 
 #endif /* CONFIG_ARCH_ENABLE_SUPERVISOR_PKEYS */
-- 
2.35.1