From: Peter Zijlstra <peterz@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Dan Williams <dan.j.williams@intel.com>,
"Luck, Tony" <tony.luck@intel.com>,
Ingo Molnar <mingo@kernel.org>,
Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@alien8.de>,
Thomas Gleixner <tglx@linutronix.de>,
Rik van Riel <riel@surriel.com>
Subject: Re: [GIT PULL] x86/mm changes for v4.21
Date: Thu, 7 Feb 2019 15:01:31 +0100 [thread overview]
Message-ID: <20190207140131.GB32477@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <CAHk-=whSRGDk9437PvMFEvDvc5hr73fXj+CvNHZu=vNE=GFDFg@mail.gmail.com>
On Thu, Feb 07, 2019 at 11:50:52AM +0000, Linus Torvalds wrote:
> If you re-generate the canonical address in __cpa_addr(), now we'll
> actually have the real virtual address around for a lot of code-paths
> (pte lookup etc), which was what people wanted to avoid in the first
> place.
Note that it's an 'unsigned long' address, not an actual pointer, and
(afaict) non of the code paths use it as a pointer. This _should_ avoid
the CPU from following said pointer and doing a deref on it.
But yes, I didn't go all the way down, maybe I missed some.
next prev parent reply other threads:[~2019-02-07 14:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-24 23:11 Ingo Molnar
2018-12-27 2:45 ` pr-tracker-bot
2019-02-07 0:17 ` Luck, Tony
2019-02-07 0:33 ` Dave Hansen
2019-02-07 9:50 ` Peter Zijlstra
2019-02-07 10:18 ` Peter Zijlstra
2019-02-07 11:50 ` Linus Torvalds
2019-02-07 14:01 ` Peter Zijlstra [this message]
2019-02-07 17:36 ` Luck, Tony
2019-02-07 17:57 ` Peter Zijlstra
2019-02-07 18:07 ` Andy Lutomirski
2019-02-07 18:46 ` Luck, Tony
2019-02-07 20:24 ` Andy Lutomirski
2019-02-07 22:53 ` Linus Torvalds
2019-02-07 23:05 ` Andy Lutomirski
2019-02-07 18:40 ` Luck, Tony
2019-02-08 12:08 ` [PATCH] x86/mm/cpa: Fix set_mce_nospec() Peter Zijlstra
2019-02-08 13:37 ` [tip:x86/urgent] " tip-bot for Peter Zijlstra
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