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Date:   Sat, 2 Dec 2017 11:38:09 +0100 (CET)
From:   Thomas Gleixner <>
To:     Andy Lutomirski <>
cc:     X86 ML <>, Borislav Petkov <>,
        "" <>,
        Brian Gerst <>,
        Dave Hansen <>,
        Linus Torvalds <>,
        Josh Poimboeuf <>
Subject: Re: [PATCH 2/2] x86/kpti: Reference all cpu_entry_area pagetables
 in the usermode tables

On Fri, 1 Dec 2017, Andy Lutomirski wrote:

> We were manually configuring cpu_entry_area in the usermode tables.
> This was error-prone and wasted memory.  (Not much memory, but
> still.)  Instead, just reference the same pagetables.
> This avoids needing to keep the KPTI code and the normal
> cpu_entry_area code in sync, since the KPTI code no longer cares
> what's in cpu_entry_area.
> [This does *not* work on the current KPTI series.  It requires that
>  all the kernelmode cpu_entry_tables are pre-allocated.  That
>  happens in the series as I submitted it, but tglx changed it for
>  reasons that I haven't figured out.]

As I said it crashed and burned for yet unknown reasons. I'll dig into


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