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x86/mm/pae: Populate the user page-table with user pgd's
When a PGD entry is populated, make sure to populate it in the user page-table too. Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Pavel Machek <pavel@ucw.cz> Cc: "H . Peter Anvin" <hpa@zytor.com> Cc: linux-mm@kvack.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Juergen Gross <jgross@suse.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Brian Gerst <brgerst@gmail.com> Cc: David Laight <David.Laight@aculab.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Eduardo Valentin <eduval@amazon.com> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: Will Deacon <will.deacon@arm.com> Cc: aliguori@amazon.com Cc: daniel.gruss@iaik.tugraz.at Cc: hughd@google.com Cc: keescook@google.com Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Waiman Long <llong@redhat.com> Cc: "David H . Gutteridge" <dhgutteridge@sympatico.ca> Cc: joro@8bytes.org Link: https://lkml.kernel.org/r/1531906876-13451-23-git-send-email-joro@8bytes.org
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@ -98,6 +98,9 @@ static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
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static inline void native_set_pud(pud_t *pudp, pud_t pud)
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{
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#ifdef CONFIG_PAGE_TABLE_ISOLATION
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pud.p4d.pgd = pti_set_user_pgtbl(&pudp->p4d.pgd, pud.p4d.pgd);
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#endif
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set_64bit((unsigned long long *)(pudp), native_pud_val(pud));
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}
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@ -229,6 +232,10 @@ static inline pud_t native_pudp_get_and_clear(pud_t *pudp)
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{
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union split_pud res, *orig = (union split_pud *)pudp;
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#ifdef CONFIG_PAGE_TABLE_ISOLATION
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pti_set_user_pgtbl(&pudp->p4d.pgd, __pgd(0));
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#endif
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/* xchg acts as a barrier before setting of the high bits */
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res.pud_low = xchg(&orig->pud_low, 0);
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res.pud_high = orig->pud_high;
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