From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Borislav Petkov <bp@alien8.de>
Cc: David Woodhouse <dwmw@amazon.co.uk>,
Andi Kleen <ak@linux.intel.com>, Paul Turner <pjt@google.com>,
LKML <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linux-foundation.org>,
Tim Chen <tim.c.chen@linux.intel.com>,
Dave Hansen <dave.hansen@intel.com>,
tglx@linutronix.de, Kees Cook <keescook@google.com>,
Rik van Riel <riel@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@amacapital.net>,
Jiri Kosina <jikos@kernel.org>,
gnomes@lxorguk.ukuu.org.uk, x86@kernel.org,
thomas.lendacky@amd.com
Subject: Re: [PATCH v8 03/12] x86/retpoline: Add initial retpoline support
Date: Sun, 14 Jan 2018 09:53:45 -0600 [thread overview]
Message-ID: <20180114155345.ozxzh6zbi3or37wz@treble> (raw)
In-Reply-To: <20180114150219.olnya5vlgjbmbcbr@pd.tnic>
On Sun, Jan 14, 2018 at 04:02:19PM +0100, Borislav Petkov wrote:
> On Thu, Jan 11, 2018 at 09:46:25PM +0000, David Woodhouse wrote:
> > +/*
> > + * This should be used immediately before a retpoline alternative. It tells
> > + * objtool where the retpolines are so that it can make sense of the control
> > + * flow by just reading the original instruction(s) and ignoring the
> > + * alternatives.
> > + */
> > +.macro ANNOTATE_NOSPEC_ALTERNATIVE
> > + .Lannotate_\@:
> > + .pushsection .discard.nospec
> > + .long .Lannotate_\@ - .
> > + .popsection
> > +.endm
>
> Hey Josh, what happened to parsing only the retpoline-related
> .altinstructions sections with the X86_FEATURE bits? Or is this
> annotation used for something more additionally?
Yeah, that idea came after this patch was already written. I haven't
implemented it yet.
--
Josh
next prev parent reply other threads:[~2018-01-14 15:53 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-11 21:46 [PATCH v8 00/12] Retpoline: Avoid speculative indirect calls in kernel David Woodhouse
2018-01-11 21:46 ` [PATCH v8 01/12] objtool: Detect jumps to retpoline thunks David Woodhouse
2018-01-11 23:22 ` [tip:x86/pti] " tip-bot for Josh Poimboeuf
2018-01-11 21:46 ` [PATCH v8 02/12] objtool: Allow alternatives to be ignored David Woodhouse
2018-01-11 23:22 ` [tip:x86/pti] " tip-bot for Josh Poimboeuf
2018-01-18 19:09 ` [v8,02/12] " Guenter Roeck
2018-01-18 19:33 ` Josh Poimboeuf
2018-01-18 19:41 ` Guenter Roeck
2018-01-22 19:34 ` David Woodhouse
2018-01-22 20:25 ` Guenter Roeck
2018-01-22 20:27 ` David Woodhouse
2018-01-28 21:06 ` Josh Poimboeuf
2018-01-29 1:26 ` Guenter Roeck
2018-01-29 17:15 ` Guenter Roeck
2018-01-29 17:30 ` Josh Poimboeuf
2018-01-22 19:27 ` Guenter Roeck
2018-01-11 21:46 ` [PATCH v8 03/12] x86/retpoline: Add initial retpoline support David Woodhouse
2018-01-11 23:23 ` [tip:x86/pti] " tip-bot for David Woodhouse
2018-01-11 23:58 ` [PATCH v8 03/12] " Tom Lendacky
2018-01-12 10:28 ` David Woodhouse
2018-01-12 14:02 ` Tom Lendacky
2018-01-14 15:02 ` Borislav Petkov
2018-01-14 15:53 ` Josh Poimboeuf [this message]
2018-01-14 15:59 ` Borislav Petkov
2018-01-11 21:46 ` [PATCH v8 04/12] x86/spectre: Add boot time option to select Spectre v2 mitigation David Woodhouse
2018-01-11 23:23 ` [tip:x86/pti] " tip-bot for David Woodhouse
2018-01-23 22:40 ` [PATCH v8 04/12] " Borislav Petkov
2018-01-23 22:53 ` David Woodhouse
2018-01-23 23:05 ` Andi Kleen
2018-01-23 22:55 ` Jiri Kosina
2018-01-23 23:05 ` Borislav Petkov
2018-01-24 0:32 ` Kees Cook
2018-01-24 9:58 ` Borislav Petkov
2018-01-23 23:06 ` Jiri Kosina
2018-01-23 23:21 ` Andi Kleen
2018-01-23 23:24 ` Jiri Kosina
2018-01-23 23:45 ` Andi Kleen
2018-01-23 23:49 ` Jiri Kosina
2018-01-24 4:26 ` Greg Kroah-Hartman
2018-01-24 9:56 ` Jiri Kosina
2018-01-24 13:58 ` Greg Kroah-Hartman
2018-01-24 14:03 ` Jiri Kosina
2018-01-24 14:22 ` Greg Kroah-Hartman
2018-01-11 21:46 ` [PATCH v8 05/12] x86/retpoline/crypto: Convert crypto assembler indirect jumps David Woodhouse
2018-01-11 23:24 ` [tip:x86/pti] " tip-bot for David Woodhouse
2018-01-11 21:46 ` [PATCH v8 06/12] x86/retpoline/entry: Convert entry " David Woodhouse
2018-01-11 23:24 ` [tip:x86/pti] " tip-bot for David Woodhouse
2018-01-11 21:46 ` [PATCH v8 07/12] x86/retpoline/ftrace: Convert ftrace " David Woodhouse
2018-01-11 23:25 ` [tip:x86/pti] " tip-bot for David Woodhouse
2018-01-11 21:46 ` [PATCH v8 08/12] x86/retpoline/hyperv: Convert " David Woodhouse
2018-01-11 23:25 ` [tip:x86/pti] " tip-bot for David Woodhouse
2018-01-11 21:46 ` [PATCH v8 09/12] x86/retpoline/xen: Convert Xen hypercall " David Woodhouse
2018-01-11 23:25 ` [tip:x86/pti] " tip-bot for David Woodhouse
2018-01-11 21:46 ` [PATCH v8 10/12] x86/retpoline/checksum32: Convert assembler " David Woodhouse
2018-01-11 23:26 ` [tip:x86/pti] " tip-bot for David Woodhouse
2018-01-11 21:46 ` [PATCH v8 11/12] x86/retpoline/irq32: " David Woodhouse
2018-01-11 23:26 ` [tip:x86/pti] " tip-bot for Andi Kleen
2018-01-11 21:46 ` [PATCH v8 12/12] x86/retpoline: Fill return stack buffer on vmexit David Woodhouse
2018-01-11 23:27 ` [tip:x86/pti] " tip-bot for David Woodhouse
2018-01-11 23:51 ` [PATCH v8 12/12] " Andi Kleen
2018-01-12 11:11 ` [PATCH v8.1 " David Woodhouse
2018-01-12 11:15 ` Thomas Gleixner
2018-01-12 11:21 ` Woodhouse, David
2018-01-12 11:37 ` [tip:x86/pti] " tip-bot for David Woodhouse
2018-01-14 14:50 ` Borislav Petkov
2018-01-14 15:28 ` Thomas Gleixner
2018-01-14 15:35 ` Borislav Petkov
2018-01-25 12:07 ` Borislav Petkov
2018-01-25 12:20 ` David Woodhouse
2018-01-25 12:45 ` Borislav Petkov
2018-01-25 15:10 ` Josh Poimboeuf
2018-01-25 15:51 ` Borislav Petkov
2018-01-25 16:03 ` David Woodhouse
2018-01-25 16:56 ` Josh Poimboeuf
2018-01-25 17:00 ` David Woodhouse
2018-01-25 17:05 ` Andy Lutomirski
2018-01-25 17:44 ` Josh Poimboeuf
2018-01-25 18:41 ` Jiri Kosina
2018-01-25 17:10 ` Thomas Gleixner
2018-01-25 17:32 ` Josh Poimboeuf
2018-01-25 17:53 ` Borislav Petkov
2018-01-25 18:04 ` David Woodhouse
2018-01-25 18:32 ` Josh Poimboeuf
2018-01-25 19:07 ` Borislav Petkov
2018-01-25 19:10 ` Borislav Petkov
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