x86/mm: Fold p4d page table layer at runtime
Change page table helpers to fold p4d at runtime. The logic is the same as in <asm-generic/pgtable-nop4d.h>. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/20180214182542.69302-8-kirill.shutemov@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -569,14 +569,16 @@ static inline p4dval_t p4d_val(p4d_t p4d)
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static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
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{
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pgdval_t val = native_pgd_val(pgd);
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PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp, val);
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if (pgtable_l5_enabled)
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PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp, native_pgd_val(pgd));
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else
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set_p4d((p4d_t *)(pgdp), (p4d_t) { pgd.pgd });
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}
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static inline void pgd_clear(pgd_t *pgdp)
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{
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set_pgd(pgdp, __pgd(0));
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if (pgtable_l5_enabled)
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set_pgd(pgdp, __pgd(0));
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}
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#endif /* CONFIG_PGTABLE_LEVELS == 5 */
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@ -167,6 +167,8 @@ static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
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#if CONFIG_PGTABLE_LEVELS > 4
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static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
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{
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if (!pgtable_l5_enabled)
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return;
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paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
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set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
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}
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@ -191,7 +193,8 @@ extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
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static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
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unsigned long address)
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{
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___p4d_free_tlb(tlb, p4d);
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if (pgtable_l5_enabled)
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___p4d_free_tlb(tlb, p4d);
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}
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#endif /* CONFIG_PGTABLE_LEVELS > 4 */
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@ -65,7 +65,7 @@ extern pmdval_t early_pmd_flags;
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#ifndef __PAGETABLE_P4D_FOLDED
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#define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
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#define pgd_clear(pgd) native_pgd_clear(pgd)
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#define pgd_clear(pgd) (pgtable_l5_enabled ? native_pgd_clear(pgd) : 0)
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#endif
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#ifndef set_p4d
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@ -859,6 +859,8 @@ static inline unsigned long p4d_index(unsigned long address)
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#if CONFIG_PGTABLE_LEVELS > 4
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static inline int pgd_present(pgd_t pgd)
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{
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if (!pgtable_l5_enabled)
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return 1;
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return pgd_flags(pgd) & _PAGE_PRESENT;
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}
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@ -876,6 +878,8 @@ static inline unsigned long pgd_page_vaddr(pgd_t pgd)
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/* to find an entry in a page-table-directory. */
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static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
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{
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if (!pgtable_l5_enabled)
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return (p4d_t *)pgd;
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return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address);
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}
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@ -883,6 +887,9 @@ static inline int pgd_bad(pgd_t pgd)
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{
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unsigned long ignore_flags = _PAGE_USER;
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if (!pgtable_l5_enabled)
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return 0;
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if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
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ignore_flags |= _PAGE_NX;
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@ -891,6 +898,8 @@ static inline int pgd_bad(pgd_t pgd)
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static inline int pgd_none(pgd_t pgd)
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{
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if (!pgtable_l5_enabled)
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return 0;
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/*
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* There is no need to do a workaround for the KNL stray
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* A/D bit erratum here. PGDs only point to page tables
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