From: Andi Kleen <andi@firstfloor.org>
To: Andrew Lutomirski <luto@mit.edu>
Cc: Andi Kleen <andi@firstfloor.org>,
"H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
torvalds@linux-foundation.org, lueckintel@yahoo.com,
kimwooyoung@gmail.com
Subject: Re: New vsyscall emulation breaks JITs
Date: Fri, 5 Aug 2011 23:21:53 +0200 [thread overview]
Message-ID: <20110805212153.GL5782@one.firstfloor.org> (raw)
In-Reply-To: <CAObL_7G2TqBVXvfuh2GPNteYBNoc8_s398KS+jPOPQYAhPHz0Q@mail.gmail.com>
On Fri, Aug 05, 2011 at 05:00:44PM -0400, Andrew Lutomirski wrote:
> > If anything runtime, but really for me it looks like the vsyscall
> > changes should be only in one of those limited compability paranoia
> > patchkits.
>
> Switching it in runtime would be a giant mess because user code might
You can always switch at boot time.
But really serious binary incompatibility like this should not be default
(not even talking about the slow down for existing binaries using time())
-Andi
next prev parent reply other threads:[~2011-08-05 21:21 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-05 20:09 New vsyscall emulation breaks JITs Andi Kleen
2011-08-05 20:23 ` H. Peter Anvin
2011-08-05 20:26 ` Andi Kleen
2011-08-05 20:36 ` H. Peter Anvin
2011-08-05 20:47 ` Andi Kleen
2011-08-05 20:45 ` Andrew Lutomirski
2011-08-05 20:48 ` H. Peter Anvin
2011-08-05 20:52 ` Andi Kleen
2011-08-05 21:00 ` Andrew Lutomirski
2011-08-05 21:21 ` Andi Kleen [this message]
2011-08-05 21:26 ` Andrew Lutomirski
2011-08-05 22:06 ` H. Peter Anvin
2011-08-05 22:11 ` Andrew Lutomirski
2011-08-06 0:20 ` Andrew Lutomirski
2011-08-06 0:32 ` H. Peter Anvin
2011-08-06 3:01 ` [RFC] x86-64: Allow emulated vsyscalls from user addresses Andy Lutomirski
2011-08-06 3:04 ` [RFC v2] " Andy Lutomirski
2011-08-06 6:45 ` Ingo Molnar
2011-08-07 12:19 ` Borislav Petkov
2011-08-07 12:58 ` Andrew Lutomirski
2011-08-07 15:44 ` Borislav Petkov
2011-08-07 16:14 ` Andrew Lutomirski
2011-08-11 13:16 ` Pavel Machek
2011-08-11 13:27 ` Andrew Lutomirski
2011-08-09 22:27 ` New vsyscall emulation breaks JITs Suresh Siddha
2011-08-09 13:26 ` Andrew Lutomirski
2011-08-09 15:04 ` Andi Kleen
2011-08-09 15:22 ` Andrew Lutomirski
2011-08-09 16:47 ` [RFC] x86-64: Add vsyscall=emulate|native|none option Andy Lutomirski
2011-08-09 19:54 ` Linus Torvalds
2011-08-09 16:57 ` New vsyscall emulation breaks JITs H. Peter Anvin
2011-08-09 17:05 ` Andrew Lutomirski
[not found] ` <1312919938.17118.YahooMailNeo@web120010.mail.ne1.yahoo.com>
2011-08-09 20:59 ` H. Peter Anvin
2011-08-09 21:04 ` Andrew Lutomirski
2011-08-09 22:36 ` Linus Torvalds
2011-08-10 0:56 ` H. Peter Anvin
[not found] ` <1312934493.45753.YahooMailNeo@web120015.mail.ne1.yahoo.com>
2011-08-10 1:49 ` H. Peter Anvin
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