linux-kernel - [tip:x86/pti] x86/pgtable: Move pti_set_user

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Message-ID: <tip-fcbbd977572cfe5a3dcc97d663bf7480431a07ca@git.kernel.org>
Date:   Thu, 19 Jul 2018 16:28:23 -0700
From:   tip-bot for Joerg Roedel <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, jkosina@...e.cz, luto@...nel.org,
        tglx@...utronix.de, aarcange@...hat.com, bp@...en8.de,
        llong@...hat.com, eduval@...zon.com, dave.hansen@...el.com,
        peterz@...radead.org, jroedel@...e.de, jpoimboe@...hat.com,
        linux-kernel@...r.kernel.org, boris.ostrovsky@...cle.com,
        dvlasenk@...hat.com, gregkh@...uxfoundation.org,
        torvalds@...ux-foundation.org, pavel@....cz,
        David.Laight@...lab.com, will.deacon@....com, hpa@...or.com,
        brgerst@...il.com, jgross@...e.com, dhgutteridge@...patico.ca
Subject: [tip:x86/pti] x86/pgtable: Move pti_set_user_pgtbl() to pgtable.h

Commit-ID:  fcbbd977572cfe5a3dcc97d663bf7480431a07ca
Gitweb:     https://git.kernel.org/tip/fcbbd977572cfe5a3dcc97d663bf7480431a07ca
Author:     Joerg Roedel <jroedel@...e.de>
AuthorDate: Wed, 18 Jul 2018 11:40:56 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 20 Jul 2018 01:11:42 +0200

x86/pgtable: Move pti_set_user_pgtbl() to pgtable.h

There it is also usable from 32 bit code.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Pavel Machek <pavel@....cz>
Cc: "H . Peter Anvin" <hpa@...or.com>
Cc: linux-mm@...ck.org
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Juergen Gross <jgross@...e.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Jiri Kosina <jkosina@...e.cz>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: Brian Gerst <brgerst@...il.com>
Cc: David Laight <David.Laight@...lab.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Eduardo Valentin <eduval@...zon.com>
Cc: Greg KH <gregkh@...uxfoundation.org>
Cc: Will Deacon <will.deacon@....com>
Cc: aliguori@...zon.com
Cc: daniel.gruss@...k.tugraz.at
Cc: hughd@...gle.com
Cc: keescook@...gle.com
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Waiman Long <llong@...hat.com>
Cc: "David H . Gutteridge" <dhgutteridge@...patico.ca>
Cc: joro@...tes.org
Link: https://lkml.kernel.org/r/1531906876-13451-20-git-send-email-joro@8bytes.org

---
 arch/x86/include/asm/pgtable.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index eb474329d751..cc117161f13d 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -640,8 +640,31 @@ static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,

 pmd_t *populate_extra_pmd(unsigned long vaddr);
 pte_t *populate_extra_pte(unsigned long vaddr);
+
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
+pgd_t __pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd);
+
+/*
+ * Take a PGD location (pgdp) and a pgd value that needs to be set there.
+ * Populates the user and returns the resulting PGD that must be set in
+ * the kernel copy of the page tables.
+ */
+static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
+{
+	if (!static_cpu_has(X86_FEATURE_PTI))
+		return pgd;
+	return __pti_set_user_pgtbl(pgdp, pgd);
+}
+#else   /* CONFIG_PAGE_TABLE_ISOLATION */
+static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
+{
+	return pgd;
+}
+#endif  /* CONFIG_PAGE_TABLE_ISOLATION */
+
 #endif	/* __ASSEMBLY__ */

+
 #ifdef CONFIG_X86_32
 # include <asm/pgtable_32.h>
 #else