Messages in this thread Patch in this message | | | From | Toshi Kani <> | Subject | [PATCH v2 5/7] x86, mm: Support huge KVA mappings on x86 | Date | Mon, 9 Feb 2015 15:45:33 -0700 |
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Implement huge KVA mapping interfaces on x86. Select HAVE_ARCH_HUGE_VMAP when X86_64 or X86_32 with X86_PAE is set. Without X86_PAE set, the X86_32 kernel has the 2-level page tables and cannot provide the huge KVA mappings.
Signed-off-by: Toshi Kani <toshi.kani@hp.com> --- arch/x86/Kconfig | 1 + arch/x86/mm/pgtable.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 0dc9d01..a79e286 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -97,6 +97,7 @@ config X86 select IRQ_FORCED_THREADING select HAVE_BPF_JIT if X86_64 select HAVE_ARCH_TRANSPARENT_HUGEPAGE + select HAVE_ARCH_HUGE_VMAP if X86_64 || (X86_32 && X86_PAE) select ARCH_HAS_SG_CHAIN select CLKEVT_I8253 select ARCH_HAVE_NMI_SAFE_CMPXCHG diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c index 6fb6927..e495432 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -481,3 +481,37 @@ void native_set_fixmap(enum fixed_addresses idx, phys_addr_t phys, { __native_set_fixmap(idx, pfn_pte(phys >> PAGE_SHIFT, flags)); } + +#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP +void pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot) +{ + set_pte((pte_t *)pud, pfn_pte( + (u64)addr >> PAGE_SHIFT, + __pgprot(pgprot_val(prot) | _PAGE_PSE))); +} + +void pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot) +{ + set_pte((pte_t *)pmd, pfn_pte( + (u64)addr >> PAGE_SHIFT, + __pgprot(pgprot_val(prot) | _PAGE_PSE))); +} + +int pud_clear_huge(pud_t *pud) +{ + if (pud_large(*pud)) { + pud_clear(pud); + return 1; + } + return 0; +} + +int pmd_clear_huge(pmd_t *pmd) +{ + if (pmd_large(*pmd)) { + pmd_clear(pmd); + return 1; + } + return 0; +} +#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
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