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Date:   Fri, 26 Apr 2019 09:42:23 +0200
From:   Peter Zijlstra <>
To:     Mike Rapoport <>
        Alexandre Chartre <>,
        Andy Lutomirski <>,
        Borislav Petkov <>,
        Dave Hansen <>,
        "H. Peter Anvin" <>, Ingo Molnar <>,
        James Bottomley <>,
        Jonathan Adams <>,
        Kees Cook <>,
        Paul Turner <>,
        Thomas Gleixner <>,,,
Subject: Re: [RFC PATCH 5/7] x86/mm/fault: hook up SCI verification

On Fri, Apr 26, 2019 at 12:45:52AM +0300, Mike Rapoport wrote:
> If a system call runs in isolated context, it's accesses to kernel code and
> data will be verified by SCI susbsytem.
> Signed-off-by: Mike Rapoport <>
> ---
>  arch/x86/mm/fault.c | 28 ++++++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)

There's a distinct lack of touching do_double_fault(). It appears to me
that you'll instantly trigger #DF when you #PF, because the #PF handler
itself will not be able to run.

And then obviously you have to be very careful to make sure #DF can,
_at_all_times_ run, otherwise you'll tripple-fault and we all know what
that does.

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