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Subject[PATCH v2 5/7] x86, mm: Support huge KVA mappings on x86
Date
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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