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| author |   Sean Christopherson <sean.j.christopherson@intel.com> | 2020-01-08 12:24:39 -0800 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2020-01-27 20:00:03 +0100 |
| commit | 13c72c060f1ba6f4eddd7b1c4f52a8aded43d6d9 (patch) | |
| tree | c0043704b8ec370deff286db8bbaa8f8ebed74dd /arch/x86/include/asm | |
| parent | KVM: Play nice with read-only memslots when querying host page size (diff) | |
| download | linux-dev-13c72c060f1ba6f4eddd7b1c4f52a8aded43d6d9.tar.xz linux-dev-13c72c060f1ba6f4eddd7b1c4f52a8aded43d6d9.zip | |
x86/mm: Introduce lookup_address_in_mm()
Add a helper, lookup_address_in_mm(), to traverse the page tables of a
given mm struct. KVM will use the helper to retrieve the host mapping
level, e.g. 4k vs. 2mb vs. 1gb, of a compound (or DAX-backed) page
without having to resort to implementation specific metadata. E.g. KVM
currently uses different logic for HugeTLB vs. THP, and would add a
third variant for DAX-backed files.
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/pgtable_types.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index b5e49e6bac63..b68f72adb53e 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -561,6 +561,10 @@ static inline void update_page_count(int level, unsigned long pages) { } extern pte_t *lookup_address(unsigned long address, unsigned int *level); extern pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address, unsigned int *level); + +struct mm_struct; +extern pte_t *lookup_address_in_mm(struct mm_struct *mm, unsigned long address, + unsigned int *level); extern pmd_t *lookup_pmd_address(unsigned long address); extern phys_addr_t slow_virt_to_phys(void *__address); extern int __init kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, |