linux-kernel - [PATCH V10 30/44] memremap_pages: Set PKS pkey in PTEs if requested

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Date:   Tue, 19 Apr 2022 10:06:35 -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 30/44] memremap_pages: Set PKS pkey in PTEs if requested

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

When a devmap caller requests protections, the dev_pagemap PTE's need to
have a PKEY set.

When PGMAP_PROTECTIONS is requested add the pkey to the page
protections.

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

---
Changes for V9
	From Dave Hansen
		use pkey
---
 mm/memremap.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/mm/memremap.c b/mm/memremap.c
index 4dfb3025cee3..215ab9c51917 100644
--- a/mm/memremap.c
+++ b/mm/memremap.c
@@ -81,6 +81,14 @@ 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);
@@ -91,6 +99,10 @@ static void devmap_protection_disable(void)
 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)
@@ -333,6 +345,7 @@ 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) {
-- 
2.35.1