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    Subject[PATCH PTI v2 0/6] Clean up pgd handling and fix VSYSCALL and LDT
    Date
    I'm getting reasonably happy with this.  It still needs more testing,
    but I want to get it out there.

    The main things that need testing are the 5-level case for the both
    vsyscalls and the LDT. I'm getting a double-fault in ldt_gdt_64,
    but I haven't checked whether it's a bug in this series, and it
    kind of looks like it isn't. I'll figure it out in the morning.
    The docs also want updating for the 5 level case.

    Changes from v1:
    - vsyscalls actually work.
    - Added the "Warn and fail" patch to prevent the testing goof I had on v1.
    - Lots of cleanups

    Andy Lutomirski (6):
    x86/pti: Vastly simplify pgd synchronization
    Revert "x86/mm/pti: Disable native VSYSCALL"
    x86/vsyscall/64: Explicitly set _PAGE_USER in the pagetable hierarchy
    x86/vsyscall/64: Warn and fail vsyscall emulation in NATIVE mode
    x86/pti: Map the vsyscall page if needed
    x86/pti: Put the LDT in its own PGD if PTI is on

    Documentation/x86/x86_64/mm.txt | 11 ++-
    arch/x86/Kconfig | 8 --
    arch/x86/entry/vsyscall/vsyscall_64.c | 37 ++++++++-
    arch/x86/include/asm/mmu_context.h | 33 +++++++-
    arch/x86/include/asm/pgtable.h | 6 +-
    arch/x86/include/asm/pgtable_64.h | 77 ++++++++----------
    arch/x86/include/asm/pgtable_64_types.h | 2 +
    arch/x86/include/asm/processor.h | 23 ++++--
    arch/x86/include/asm/vsyscall.h | 1 +
    arch/x86/kernel/ldt.c | 138 +++++++++++++++++++++++++++++---
    arch/x86/mm/pti.c | 115 ++++++++++++++++----------
    11 files changed, 331 insertions(+), 120 deletions(-)

    --
    2.13.6

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