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[22/39] x86/mm/pae: Populate the user page-table with user pgd's

Message ID 1531308586-29340-23-git-send-email-joro@8bytes.org (mailing list archive)
State New, archived
Headers show

Commit Message

Joerg Roedel July 11, 2018, 11:29 a.m. UTC 
From: Joerg Roedel <jroedel@suse.de>

When we populate a PGD entry, make sure we populate it in
the user page-table too.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 arch/x86/include/asm/pgtable-3level.h | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/arch/x86/include/asm/pgtable-3level.h b/arch/x86/include/asm/pgtable-3level.h
index f24df59..f2ca313 100644
--- a/arch/x86/include/asm/pgtable-3level.h
+++ b/arch/x86/include/asm/pgtable-3level.h
@@ -98,6 +98,9 @@  static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
 
 static inline void native_set_pud(pud_t *pudp, pud_t pud)
 {
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
+	pud.p4d.pgd = pti_set_user_pgtbl(&pudp->p4d.pgd, pud.p4d.pgd);
+#endif
 	set_64bit((unsigned long long *)(pudp), native_pud_val(pud));
 }
 
@@ -229,6 +232,10 @@  static inline pud_t native_pudp_get_and_clear(pud_t *pudp)
 {
 	union split_pud res, *orig = (union split_pud *)pudp;
 
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
+	pti_set_user_pgtbl(&pudp->p4d.pgd, __pgd(0));
+#endif
+
 	/* xchg acts as a barrier before setting of the high bits */
 	res.pud_low = xchg(&orig->pud_low, 0);
 	res.pud_high = orig->pud_high;