From: Jiri Kosina <jikos@kernel.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: Tim Chen <tim.c.chen@linux.intel.com>,
Jonathan Corbet <corbet@lwn.net>,
Thomas Gleixner <tglx@linutronix.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
Tom Lendacky <thomas.lendacky@amd.com>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Andrea Arcangeli <aarcange@redhat.com>,
David Woodhouse <dwmw@amazon.co.uk>,
Andi Kleen <ak@linux.intel.com>,
Dave Hansen <dave.hansen@intel.com>,
Asit Mallick <asit.k.mallick@intel.com>,
Arjan van de Ven <arjan@linux.intel.com>,
Jon Masters <jcm@redhat.com>, Waiman Long <longman9394@gmail.com>,
Greg KH <gregkh@linuxfoundation.org>,
Borislav Petkov <bp@alien8.de>,
linux-kernel@vger.kernel.org, x86@kernel.org,
stable@vger.kernel.org
Subject: Re: [PATCH] x86/speculation: Add document to describe Spectre and its mitigations
Date: Mon, 14 Jan 2019 14:06:19 +0100 (CET) [thread overview]
Message-ID: <nycvar.YFH.7.76.1901141403550.6626@cbobk.fhfr.pm> (raw)
In-Reply-To: <20190114130153.GC21544@amd>
On Mon, 14 Jan 2019, Pavel Machek wrote:
> Frankly I'd not call it Meltdown, as it works only on data in the cache,
> so the defense is completely different. Seems more like a l1tf
> :-).
Meltdown on x86 also seems to work only for data in L1D, but the pipeline
could be constructed in a way that data are actually fetched into L1D
before speculation gives up, which is not the case on ppc (speculation
aborts on L2->L1 propagation IIRC). That's why flushing L1D on ppc is
sufficient, but on x86 it's not.
--
Jiri Kosina
SUSE Labs
next prev parent reply other threads:[~2019-01-14 13:06 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-21 17:44 [PATCH] x86/speculation: Add document to describe Spectre and its mitigations Tim Chen
2018-12-21 21:59 ` Ben Greear
2018-12-22 1:17 ` Tim Chen
2018-12-31 16:22 ` Ben Greear
2018-12-31 17:10 ` Arjan van de Ven
2019-01-07 17:57 ` Tim Chen
2019-01-09 0:58 ` Ben Greear
2019-01-09 1:35 ` Tim Chen
2018-12-23 23:11 ` Alexei Starovoitov
2019-01-08 21:12 ` Tim Chen
2019-01-09 1:11 ` Alexei Starovoitov
2019-01-09 1:41 ` Tim Chen
2019-01-09 2:42 ` Alexei Starovoitov
2018-12-28 17:34 ` Jonathan Corbet
2019-01-08 21:18 ` Tim Chen
2019-01-13 23:10 ` Pavel Machek
2019-01-13 23:12 ` Jiri Kosina
2019-01-14 12:01 ` Pavel Machek
2019-01-14 12:06 ` Jiri Kosina
2019-01-14 13:01 ` Pavel Machek
2019-01-14 13:06 ` Jiri Kosina [this message]
2019-01-14 14:39 ` Arjan van de Ven
2019-01-30 0:12 ` Thomas Gleixner
2019-02-12 12:00 ` Thomas Gleixner
2019-02-12 17:36 ` Tim Chen
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