From: Andrew Lutomirski <luto@mit.edu>
To: Ingo Molnar <mingo@elte.hu>
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 09:17:39 -0400 [thread overview]
Message-ID: <BANLkTimqf7HY9AnMDjPr197m4LrA4qJNkg@mail.gmail.com> (raw)
In-Reply-To: <20110531131117.GB13888@elte.hu>
On Tue, May 31, 2011 at 9:11 AM, Ingo Molnar <mingo@elte.hu> wrote:
>
> * Andrew Lutomirski <luto@mit.edu> wrote:
>
>> > 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.
>>
>> The more compatible one is mfence, which in some cases could (I
>> think) be a lot more than half a cycle.
>
> I'd still suggest to do the mfence change now and remove the
> alternatives patching for now - if it's more than half a cycle then
> it sure will be implemented properly, right?
I don't know. I just cut 5 ns off the thing a couple weeks ago and no
one beat me to it :)
I'll take a look at how hard the patching will be.
--Andy
>
> Thanks,
>
> Ingo
>
prev parent reply other threads:[~2011-05-31 13:18 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
2011-05-31 13:06 ` Andrew Lutomirski
2011-05-31 13:11 ` Ingo Molnar
2011-05-31 13:17 ` Andrew Lutomirski [this message]
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