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From: Ingo Molnar <mingo@elte.hu>
To: Andrew Lutomirski <luto@mit.edu>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Arjan van de Ven <arjan@infradead.org>,
	Jan Beulich <JBeulich@novell.com>
Subject: Re: [PATCH 0/5] x86-64: Remove syscall instructions at fixed addresses
Date: Tue, 31 May 2011 14:54:15 +0200	[thread overview]
Message-ID: <20110531125415.GD10249@elte.hu> (raw)
In-Reply-To: <BANLkTi=Gi_0Uyj+dA6GjriRU9fCzKuLU=g@mail.gmail.com>


* Andrew Lutomirski <luto@mit.edu> wrote:

> [...] More importantly, vread_tsc contains an alternative and the 
> vDSO can't currently contain alternative instructions.  That can 
> probably be fixed, but it'll take a bit of work.

You could start with picking the more compatible alternative 
instruction initially. I don't at all mind losing half a cycle of 
performance in that case ... this code should be secure first.

Thanks,

	Ingo

  reply	other threads:[~2011-05-31 12:54 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-27 17:38 [PATCH 0/5] x86-64: Remove syscall instructions at fixed addresses Andy Lutomirski
2011-05-27 17:38 ` [PATCH 1/5] x86-64: Fix alignment of jiffies variable Andy Lutomirski
2011-05-27 17:38 ` [PATCH 2/5] x86-64: Give vvars their own page Andy Lutomirski
2011-05-29 20:34   ` Borislav Petkov
2011-05-30  1:37     ` Andrew Lutomirski
2011-05-27 17:38 ` [PATCH 3/5] x86-64: Remove kernel.vsyscall64 sysctl Andy Lutomirski
2011-05-27 17:38 ` [PATCH 4/5] x86-64: Replace vsyscall gettimeofday fallback with int 0xcc Andy Lutomirski
2011-05-29 19:10   ` Ingo Molnar
2011-05-29 19:23     ` Andrew Lutomirski
2011-05-29 19:43       ` Ingo Molnar
2011-05-29 19:49       ` Ingo Molnar
2011-05-29 19:57         ` Andrew Lutomirski
2011-05-29 20:01           ` Ingo Molnar
2011-05-29 20:04             ` Andrew Lutomirski
2011-05-29 20:26     ` Borislav Petkov
2011-05-29 19:49   ` Jesper Juhl
2011-05-29 19:54     ` Jesper Juhl
2011-05-29 20:05       ` Andrew Lutomirski
2011-05-29 20:07         ` Jesper Juhl
2011-05-27 17:38 ` [PATCH 5/5] x86-64: Map the HPET NX Andy Lutomirski
2011-05-29 19:19 ` [PATCH 0/5] x86-64: Remove syscall instructions at fixed addresses Ingo Molnar
2011-05-31  2:33   ` Andrew Lutomirski
2011-05-31  8:07     ` Ingo Molnar
2011-05-31 12:27       ` Andrew Lutomirski
2011-05-31 12:54         ` Ingo Molnar [this message]
2011-05-31 13:06           ` Andrew Lutomirski
2011-05-31 13:11             ` Ingo Molnar
2011-05-31 13:17               ` Andrew Lutomirski

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