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Date: Tue, 9 May 2017 16:57:28 +0200
From: Richard Weinberger <>
To: "Fogh, Anders" <>,
 Daniel Gruss <>
Cc: Christoph Hellwig <>,
 kernel list <>,
 "" <>,
 "" <>,
 "" <>,
 Michael Schwarz <>,
 Richard Fellner <>,
 "Kirill A. Shutemov" <>,
 Ingo Molnar <>
Subject: Re: Re: [RFC, PATCH] x86_64: KAISER - do not
 mapkernel in user mode

Am 09.05.2017 um 16:44 schrieb Fogh, Anders:
>>> i.e. how does it perform on recent AMD systems?
> Sorry for the latency. Recent AMD is reported by Enrique Nissem to not
> be vulnerable to the prefetch attack. TSX attack doesn't apply to AMD.
> Hund, Willems & Holz wrote in 2013 that AMD was vulnerable to that
> attack. The BTB is almost surely working in a different manner of
> fashion if at all. So AMD may or may not be vulnerable to the DPF
> attack, but none of the modern attacks should work - at least out of the
> box.

But the promoted patch will also run on AMD systems, that's why I asked
for the overhead.


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