From: Ben Collins <ben.collins@ubuntu.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Pavel Machek <pavel@ucw.cz>,
linux-kernel@vger.kernel.org, torvalds@osdl.org
Subject: Re: [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading.
Date: Fri, 01 Dec 2006 10:09:17 -0500 [thread overview]
Message-ID: <1164985757.5257.933.camel@gullible> (raw)
In-Reply-To: <1164983529.3233.73.camel@laptopd505.fenrus.org>
On Fri, 2006-12-01 at 15:32 +0100, Arjan van de Ven wrote:
> >
> > The idea is that we want our users to be able to use hyper-threading,
> > but we don't want it on by default.
>
> Hi,
>
> can I ask why not?
I'm just basing this on the history of the patch, which preceeds me, so
if this is incorrect, please don't blame me for misinformation :)
The original patch claims that hyper-threading opens the user up to some
sort of security risk involving hardware limitations in protecting
memory across the threads. I can't recall all the details.
If this is wrong, I'm more than happy to just drop the whole damn patch.
next prev parent reply other threads:[~2006-12-01 15:09 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-30 4:26 Ubuntu patch sync for 2.6.20 Ben Collins
2006-11-30 4:26 ` Ben Collins
2006-11-30 4:26 ` Ben Collins
2006-11-30 4:26 ` [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading Ben Collins
2006-11-30 11:06 ` Alan
2006-11-30 18:08 ` Siddha, Suresh B
2006-12-01 13:29 ` Pavel Machek
2006-12-01 13:41 ` Ben Collins
2006-12-01 14:32 ` Arjan van de Ven
2006-12-01 15:09 ` Ben Collins [this message]
2006-12-01 16:10 ` Arjan van de Ven
2006-12-01 16:14 ` Ben Collins
2006-12-01 16:20 ` Linus Torvalds
2006-12-01 16:56 ` Alan
2006-12-01 17:13 ` Mark Rustad
2006-11-30 4:26 ` [PATCH 2/4] [APIC] Allow disabling of UP APIC/IO-APIC by default, with command line option to turn it on Ben Collins
2006-12-01 8:39 ` Ingo Molnar
2006-12-01 20:56 ` Ben Collins
2006-12-02 8:56 ` Ingo Molnar
2006-11-30 4:26 ` [PATCH 3/4] [ATM] Add CPPFLAGS to byteorder.h check Ben Collins
2006-11-30 4:26 ` [PATCH 4/4] [HVCS] Select HVC_CONSOLE if HVCS is enabled Ben Collins
2006-11-30 12:32 ` Roman Zippel
2006-11-30 15:04 ` Ben Collins
2006-12-07 22:50 [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading Peter Cordes
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