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x86/mm/pageattr: Lookup address in an arbitrary PGD
This is preparatory work in order to be able to map pages into a specified PGD and not implicitly and only into init_mm. Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
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@ -30,6 +30,7 @@
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*/
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struct cpa_data {
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unsigned long *vaddr;
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pgd_t *pgd;
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pgprot_t mask_set;
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pgprot_t mask_clr;
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int numpages;
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@ -322,17 +323,9 @@ static inline pgprot_t static_protections(pgprot_t prot, unsigned long address,
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return prot;
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}
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/*
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* Lookup the page table entry for a virtual address. Return a pointer
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* to the entry and the level of the mapping.
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*
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* Note: We return pud and pmd either when the entry is marked large
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* or when the present bit is not set. Otherwise we would return a
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* pointer to a nonexisting mapping.
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*/
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pte_t *lookup_address(unsigned long address, unsigned int *level)
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static pte_t *__lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
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unsigned int *level)
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{
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pgd_t *pgd = pgd_offset_k(address);
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pud_t *pud;
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pmd_t *pmd;
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@ -361,8 +354,31 @@ pte_t *lookup_address(unsigned long address, unsigned int *level)
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return pte_offset_kernel(pmd, address);
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}
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/*
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* Lookup the page table entry for a virtual address. Return a pointer
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* to the entry and the level of the mapping.
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*
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* Note: We return pud and pmd either when the entry is marked large
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* or when the present bit is not set. Otherwise we would return a
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* pointer to a nonexisting mapping.
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*/
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pte_t *lookup_address(unsigned long address, unsigned int *level)
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{
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return __lookup_address_in_pgd(pgd_offset_k(address), address, level);
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}
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EXPORT_SYMBOL_GPL(lookup_address);
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static pte_t *_lookup_address_cpa(struct cpa_data *cpa, unsigned long address,
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unsigned int *level)
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{
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if (cpa->pgd)
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return __lookup_address_in_pgd(cpa->pgd + pgd_index(address),
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address, level);
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return lookup_address(address, level);
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}
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/*
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* This is necessary because __pa() does not work on some
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* kinds of memory, like vmalloc() or the alloc_remap()
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