linux-kernel - [tip:x86/pti] x86/mm/legacy: Populate the user page-table with user pgd's

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Date:   Thu, 19 Jul 2018 16:30:34 -0700
From:   tip-bot for Joerg Roedel <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     dhgutteridge@...patico.ca, dvlasenk@...hat.com, jroedel@...e.de,
        hpa@...or.com, gregkh@...uxfoundation.org, peterz@...radead.org,
        David.Laight@...lab.com, jgross@...e.com, luto@...nel.org,
        linux-kernel@...r.kernel.org, brgerst@...il.com, bp@...en8.de,
        llong@...hat.com, dave.hansen@...el.com, aarcange@...hat.com,
        pavel@....cz, eduval@...zon.com, will.deacon@....com,
        mingo@...nel.org, torvalds@...ux-foundation.org, jkosina@...e.cz,
        jpoimboe@...hat.com, tglx@...utronix.de, boris.ostrovsky@...cle.com
Subject: [tip:x86/pti] x86/mm/legacy: Populate the user page-table with user
 pgd's

Commit-ID:  1f40a46cf47c12d93a5ad9dccd82bd36ff8f956a
Gitweb:     https://git.kernel.org/tip/1f40a46cf47c12d93a5ad9dccd82bd36ff8f956a
Author:     Joerg Roedel <jroedel@...e.de>
AuthorDate: Wed, 18 Jul 2018 11:41:00 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 20 Jul 2018 01:11:43 +0200

x86/mm/legacy: Populate the user page-table with user pgd's

Also populate the user-spage pgd's in the user page-table.

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/1531906876-13451-24-git-send-email-joro@8bytes.org

---
 arch/x86/include/asm/pgtable-2level.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/include/asm/pgtable-2level.h b/arch/x86/include/asm/pgtable-2level.h
index 685ffe8a0eaf..c399ea5eea41 100644
--- a/arch/x86/include/asm/pgtable-2level.h
+++ b/arch/x86/include/asm/pgtable-2level.h
@@ -19,6 +19,9 @@ static inline void native_set_pte(pte_t *ptep , pte_t pte)

 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
 {
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
+	pmd.pud.p4d.pgd = pti_set_user_pgtbl(&pmdp->pud.p4d.pgd, pmd.pud.p4d.pgd);
+#endif
 	*pmdp = pmd;
 }

@@ -58,6 +61,9 @@ static inline pte_t native_ptep_get_and_clear(pte_t *xp)
 #ifdef CONFIG_SMP
 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
 {
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
+	pti_set_user_pgtbl(&xp->pud.p4d.pgd, __pgd(0));
+#endif
 	return __pmd(xchg((pmdval_t *)xp, 0));
 }
 #else
@@ -67,6 +73,9 @@ static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
 #ifdef CONFIG_SMP
 static inline pud_t native_pudp_get_and_clear(pud_t *xp)
 {
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
+	pti_set_user_pgtbl(&xp->p4d.pgd, __pgd(0));
+#endif
 	return __pud(xchg((pudval_t *)xp, 0));
 }
 #else