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Date:   Mon, 16 Apr 2018 18:01:54 +0200
From:   Joerg Roedel <>
To:     Linus Torvalds <>
Cc:     Thomas Gleixner <>,
        Ingo Molnar <>,
        "H . Peter Anvin" <>,
        the arch/x86 maintainers <>,
        Linux Kernel Mailing List <>,
        linux-mm <>, Andy Lutomirski <>,
        Dave Hansen <>,
        Josh Poimboeuf <>,
        Juergen Gross <>,
        Peter Zijlstra <>,
        Borislav Petkov <>, Jiri Kosina <>,
        Boris Ostrovsky <>,
        Brian Gerst <>,
        David Laight <>,
        Denys Vlasenko <>,
        Eduardo Valentin <>,
        Greg KH <>,
        Will Deacon <>,
        "Liguori, Anthony" <>,
        Daniel Gruss <>,
        Hugh Dickins <>,
        Kees Cook <>,
        Andrea Arcangeli <>,
        Waiman Long <>, Pavel Machek <>,
        "David H . Gutteridge" <>,
        Joerg Roedel <>
Subject: Re: [PATCH 00/35 v5] PTI support for x32

Hi Linus,

On Mon, Apr 16, 2018 at 08:32:46AM -0700, Linus Torvalds wrote:
> Also, it would be nice to have performance numbers,

Here are some numbers I gathered for Ingo on v2 of the patch-set:

I don't think they significantly changed, but I can measure them again
if needed.

Besides those, what other numbers/tests are you interested in?

> and check that the global page issues are at least fixed on 32-bit
> too, since we screwed that up on x86-64 initially.
> On x86-32, the global pages are likely a bigger deal since there's no PCID.

Okay, I verify if there are any global bits left in the page-tables.
According to the PTDUMP_X86 the cpu_entry_area is mapped with G=1 (which
should be fine?) and another 4M range in the kernel mapping. I need to
check what that is.



>                   Linus

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