mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-17 04:49:33 +07:00
0e311d237d
When the P4D page table layer is folded at runtime, the p4d_free()
should do nothing, the same as in <asm-generic/pgtable-nop4d.h>.
It seems this bug should cause double-free in efi_call_phys_epilog(),
but I don't know how to trigger that code path, so I can't confirm that
by testing.
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org # 4.17
Fixes: 98219dda2a ("x86/mm: Fold p4d page table layer at runtime")
Link: http://lkml.kernel.org/r/20180625102427.15015-1-aryabinin@virtuozzo.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
208 lines
5.7 KiB
C
208 lines
5.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_PGALLOC_H
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#define _ASM_X86_PGALLOC_H
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#include <linux/threads.h>
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#include <linux/mm.h> /* for struct page */
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#include <linux/pagemap.h>
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static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }
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#ifdef CONFIG_PARAVIRT
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#include <asm/paravirt.h>
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#else
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#define paravirt_pgd_alloc(mm) __paravirt_pgd_alloc(mm)
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static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
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static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {}
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static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {}
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static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
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unsigned long start, unsigned long count) {}
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static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {}
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static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn) {}
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static inline void paravirt_release_pte(unsigned long pfn) {}
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static inline void paravirt_release_pmd(unsigned long pfn) {}
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static inline void paravirt_release_pud(unsigned long pfn) {}
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static inline void paravirt_release_p4d(unsigned long pfn) {}
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#endif
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/*
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* Flags to use when allocating a user page table page.
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*/
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extern gfp_t __userpte_alloc_gfp;
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#ifdef CONFIG_PAGE_TABLE_ISOLATION
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/*
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* Instead of one PGD, we acquire two PGDs. Being order-1, it is
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* both 8k in size and 8k-aligned. That lets us just flip bit 12
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* in a pointer to swap between the two 4k halves.
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*/
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#define PGD_ALLOCATION_ORDER 1
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#else
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#define PGD_ALLOCATION_ORDER 0
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#endif
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/*
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* Allocate and free page tables.
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*/
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extern pgd_t *pgd_alloc(struct mm_struct *);
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extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
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extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
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extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
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/* Should really implement gc for free page table pages. This could be
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done with a reference count in struct page. */
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static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
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{
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BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
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free_page((unsigned long)pte);
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}
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static inline void pte_free(struct mm_struct *mm, struct page *pte)
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{
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pgtable_page_dtor(pte);
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__free_page(pte);
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}
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extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
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static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
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unsigned long address)
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{
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___pte_free_tlb(tlb, pte);
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}
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static inline void pmd_populate_kernel(struct mm_struct *mm,
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pmd_t *pmd, pte_t *pte)
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{
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paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
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set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
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}
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static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
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struct page *pte)
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{
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unsigned long pfn = page_to_pfn(pte);
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paravirt_alloc_pte(mm, pfn);
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set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
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}
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#define pmd_pgtable(pmd) pmd_page(pmd)
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#if CONFIG_PGTABLE_LEVELS > 2
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static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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struct page *page;
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gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO;
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if (mm == &init_mm)
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gfp &= ~__GFP_ACCOUNT;
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page = alloc_pages(gfp, 0);
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if (!page)
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return NULL;
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if (!pgtable_pmd_page_ctor(page)) {
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__free_pages(page, 0);
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return NULL;
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}
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return (pmd_t *)page_address(page);
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}
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static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
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{
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BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
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pgtable_pmd_page_dtor(virt_to_page(pmd));
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free_page((unsigned long)pmd);
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}
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extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
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static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
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unsigned long address)
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{
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___pmd_free_tlb(tlb, pmd);
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}
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#ifdef CONFIG_X86_PAE
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extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
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#else /* !CONFIG_X86_PAE */
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static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
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{
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paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
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set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
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}
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#endif /* CONFIG_X86_PAE */
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#if CONFIG_PGTABLE_LEVELS > 3
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static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
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{
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paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
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set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
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}
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static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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gfp_t gfp = GFP_KERNEL_ACCOUNT;
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if (mm == &init_mm)
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gfp &= ~__GFP_ACCOUNT;
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return (pud_t *)get_zeroed_page(gfp);
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}
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static inline void pud_free(struct mm_struct *mm, pud_t *pud)
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{
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BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
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free_page((unsigned long)pud);
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}
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extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
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static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
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unsigned long address)
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{
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___pud_free_tlb(tlb, pud);
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}
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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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static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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gfp_t gfp = GFP_KERNEL_ACCOUNT;
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if (mm == &init_mm)
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gfp &= ~__GFP_ACCOUNT;
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return (p4d_t *)get_zeroed_page(gfp);
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}
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static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
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{
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if (!pgtable_l5_enabled())
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return;
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BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
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free_page((unsigned long)p4d);
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}
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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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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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#endif /* CONFIG_PGTABLE_LEVELS > 3 */
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#endif /* CONFIG_PGTABLE_LEVELS > 2 */
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#endif /* _ASM_X86_PGALLOC_H */
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