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    Subject[PATCH v2 39/46] hugetlb: x86: enable high-granularity mapping for x86_64
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    Now that HGM is fully supported for GENERAL_HUGETLB, we can enable it
    for x86_64. We can only enable it for 64-bit architectures because the
    vm flag VM_HUGETLB_HGM uses a high bit.

    The x86 KVM MMU already properly handles HugeTLB HGM pages (it does a
    page table walk to determine which size to use in the second-stage page
    table instead of, for example, checking vma_mmu_pagesize, like arm64
    does).

    Signed-off-by: James Houghton <jthoughton@google.com>

    diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
    index 3604074a878b..fde9ba1dd8d7 100644
    --- a/arch/x86/Kconfig
    +++ b/arch/x86/Kconfig
    @@ -126,6 +126,7 @@ config X86
    select ARCH_WANT_GENERAL_HUGETLB
    select ARCH_WANT_HUGE_PMD_SHARE
    select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP if X86_64
    + select ARCH_WANT_HUGETLB_HIGH_GRANULARITY_MAPPING if X86_64
    select ARCH_WANT_LD_ORPHAN_WARN
    select ARCH_WANTS_THP_SWAP if X86_64
    select ARCH_HAS_PARANOID_L1D_FLUSH
    --
    2.39.2.637.g21b0678d19-goog
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