linux-kernel - [RFC] Correct usage of swapgs instruction in arch/x86

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Message-ID: <CAO6TR8UK1ucJXnG2GwycTNJUTTHeCO6tNSRfKR5zT-YZzmex6A@mail.gmail.com>
Date:	Thu, 17 Dec 2015 02:10:24 -0700
From:	Jeff Merkey <linux.mdb@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: [RFC] Correct usage of swapgs instruction in arch/x86

Propose complete review of Linux architecture and use of swapgs
instruction to enable kgdb, kdb, mdb, kprobes, and other debugging
tools to operate correctly.

Linux currently does not support the above listed tools due to an
architectural limitation in the way Linux deals with
userspace/kernelspace transitions.
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