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    Subject[PATCH 16/35] x86/pgtable/pae: Unshare kernel PMDs when PTI is enabled
    Date
    From: Joerg Roedel <jroedel@suse.de>

    With PTI we need to map the per-process LDT into the kernel
    address-space for each process, so we need separate kernel
    PMDs per PGD.

    Signed-off-by: Joerg Roedel <jroedel@suse.de>
    ---
    arch/x86/include/asm/pgtable-3level_types.h | 5 +++--
    1 file changed, 3 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/include/asm/pgtable-3level_types.h b/arch/x86/include/asm/pgtable-3level_types.h
    index 6a59a6d..78038e0 100644
    --- a/arch/x86/include/asm/pgtable-3level_types.h
    +++ b/arch/x86/include/asm/pgtable-3level_types.h
    @@ -21,9 +21,10 @@ typedef union {
    #endif /* !__ASSEMBLY__ */

    #ifdef CONFIG_PARAVIRT
    -#define SHARED_KERNEL_PMD (pv_info.shared_kernel_pmd)
    +#define SHARED_KERNEL_PMD ((!static_cpu_has(X86_FEATURE_PTI) && \
    + (pv_info.shared_kernel_pmd)))
    #else
    -#define SHARED_KERNEL_PMD 1
    +#define SHARED_KERNEL_PMD (!static_cpu_has(X86_FEATURE_PTI))
    #endif

    /*
    --
    2.7.4
    \
     
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