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Date: Thu, 10 Dec 2015 12:55:55 -0500
From: Daniel Micay <>
Cc: Catalin Marinas <>
Subject: Re: Self Introduction

> ARMv8 64-bit: ??

The worst case scenario would be doing something like the x86_64 UDEREF.

> x86 pre-late-Broadwell: nothing upstream (though UDEREF in PaX exists)

It's worth noting that there's the pre-PCID implementation (slow and
vulnerable to races) and then two choices of better implementations when
PCID is available. You probably know that already, but it's not obvious
to everyone else.
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