linux-kernel - [PATCH V8 37/44] memremap_pages: Set PKS PKey in PTEs if PGMAP

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Date:   Thu, 27 Jan 2022 09:54:58 -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>,
        linux-kernel@...r.kernel.org
Subject: [PATCH V8 37/44] memremap_pages: Set PKS PKey in PTEs if PGMAP_PROTECTIONS is requested

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

When the user requests protections the dev_pagemap mappings need to have
a PKEY set.

Define devmap_protection_adjust_pgprot() to add the PKey to the page
protections.  Call it when PGMAP_PROTECTIONS is requested when remapping
pages.

Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 mm/memremap.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/mm/memremap.c b/mm/memremap.c
index a74d985a1908..d3e6f328a711 100644
--- a/mm/memremap.c
+++ b/mm/memremap.c
@@ -83,6 +83,14 @@ static void devmap_protection_enable(void)
 	static_branch_inc(&dev_pgmap_protection_static_key);
 }
 
+static pgprot_t devmap_protection_adjust_pgprot(pgprot_t prot)
+{
+	pgprotval_t val;
+
+	val = pgprot_val(prot);
+	return __pgprot(val | _PAGE_PKEY(PKS_KEY_PGMAP_PROTECTION));
+}
+
 static void devmap_protection_disable(void)
 {
 	static_branch_dec(&dev_pgmap_protection_static_key);
@@ -99,6 +107,10 @@ EXPORT_SYMBOL_GPL(pgmap_protection_available);
 static void devmap_protection_enable(void) { }
 static void devmap_protection_disable(void) { }
 
+static pgprot_t devmap_protection_adjust_pgprot(pgprot_t prot)
+{
+	return prot;
+}
 #endif /* CONFIG_DEVMAP_ACCESS_PROTECTION */
 
 static void pgmap_array_delete(struct range *range)
@@ -353,6 +365,7 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
 		if (!pgmap_protection_available())
 			return ERR_PTR(-EINVAL);
 		devmap_protection_enable();
+		params.pgprot = devmap_protection_adjust_pgprot(params.pgprot);
 	}
 
 	switch (pgmap->type) {
-- 
2.31.1