linux-kernel - Re: [PATCH 4/7] x86: Add support for rd/wr fs/gs base

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Message-ID: <20140501215139.GI2382@two.firstfloor.org>
Date:	Thu, 1 May 2014 23:51:39 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Andi Kleen <andi@...stfloor.org>, "H. Peter Anvin" <hpa@...or.com>,
	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 4/7] x86: Add support for rd/wr fs/gs base

> Allowing userspace to prevent itself from being rescheduled by loading
> something strange into gsbase seems unfortunate.

The timer tick will eventually catch it, so any delay is tightly
bounded.

Also still gets rescheduled most of the time, just not when a paranoid 
exception handler is running.

-Andi
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