From mboxrd@z Thu Jan 1 00:00:00 1970 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758510AbeAIAAY (ORCPT + 1 other); Mon, 8 Jan 2018 19:00:24 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:58438 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758494AbeAIAAW (ORCPT ); Mon, 8 Jan 2018 19:00:22 -0500 Message-ID: <1515456009.4423.63.camel@infradead.org> Subject: Re: [PATCH] x86/retpoline: Also fill return buffer after idle From: David Woodhouse To: Andi Kleen Cc: pjt@google.com, linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, gregkh@linux-foundation.org, tim.c.chen@linux.intel.com, dave.hansen@intel.com, tglx@linutronix.de, peterz@infradead.org, luto@amacapital.net, Andi Kleen In-Reply-To: <20180108235126.28736-1-andi@firstfloor.org> References: <20180108235126.28736-1-andi@firstfloor.org> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-iMd9hgpLnTn5HX4fOT32" Date: Tue, 09 Jan 2018 00:00:09 +0000 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: --=-iMd9hgpLnTn5HX4fOT32 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2018-01-08 at 15:51 -0800, Andi Kleen wrote: > From: Andi Kleen >=20 > This is an extension of the earlier patch to fill the return buffer > on context switch. It uses the assembler macros added earlier. >=20 > When we go into deeper idle states the return buffer could be cleared > in MWAIT, but then another thread which wakes up earlier might > be poisoning the indirect branch predictor. Then when the return > buffer underflows there might an uncontrolled indirect branch. >=20 > To guard against this always fill the return buffer when exiting idle. >=20 > Needed on Skylake and some Broadwells. >=20 > Signed-off-by: Andi Kleen > --- > =C2=A0arch/x86/entry/entry_32.S=C2=A0=C2=A0=C2=A0=C2=A0|=C2=A0=C2=A08 +++= +++++ > =C2=A0arch/x86/entry/entry_64.S=C2=A0=C2=A0=C2=A0=C2=A0|=C2=A0=C2=A08 +++= +++++ > =C2=A0arch/x86/include/asm/mwait.h | 11 ++++++++++- > =C2=A03 files changed, 26 insertions(+), 1 deletion(-) >=20 > diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S > index 7dee84a3cf83..2687cce8a02e 100644 > --- a/arch/x86/entry/entry_32.S > +++ b/arch/x86/entry/entry_32.S > @@ -1092,3 +1092,11 @@ ENTRY(rewind_stack_do_exit) > =C2=A0 call do_exit > =C2=A01: jmp 1b > =C2=A0END(rewind_stack_do_exit) > + > +ENTRY(fill_return_buffer) > +#ifdef CONFIG_RETPOLINE > + ALTERNATIVE "ret", "", X86_FEATURE_RETPOLINE > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0FILL_RETURN_BUFFER > +#endif > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ret > +END(fill_return_buffer) > diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S > index a33033e2bfe0..92fbec1b0eb5 100644 > --- a/arch/x86/entry/entry_64.S > +++ b/arch/x86/entry/entry_64.S > @@ -1831,3 +1831,11 @@ ENTRY(rewind_stack_do_exit) > =C2=A0 > =C2=A0 call do_exit > =C2=A0END(rewind_stack_do_exit) > + > +ENTRY(fill_return_buffer) > +#ifdef CONFIG_RETPOLINE > + ALTERNATIVE "ret", "", X86_FEATURE_RETPOLINE > + FILL_RETURN_BUFFER > +#endif > + ret > +END(fill_return_buffer) > diff --git a/arch/x86/include/asm/mwait.h b/arch/x86/include/asm/mwait.h > index 39a2fb29378a..1d9f9269b5e7 100644 > --- a/arch/x86/include/asm/mwait.h > +++ b/arch/x86/include/asm/mwait.h > @@ -87,6 +87,8 @@ static inline void __sti_mwait(unsigned long eax, unsig= ned long ecx) > =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0:: "a" (eax), "c" (ecx)); > =C2=A0} > =C2=A0 > +extern __visible void fill_return_buffer(void); > + > =C2=A0/* > =C2=A0 * This uses new MONITOR/MWAIT instructions on P4 processors with P= NI, > =C2=A0 * which can obviate IPI to trigger checking of need_resched. > @@ -107,8 +109,15 @@ static inline void mwait_idle_with_hints(unsigned lo= ng eax, unsigned long ecx) > =C2=A0 } > =C2=A0 > =C2=A0 __monitor((void *)=C2=A4t_thread_info()->flags, 0, 0); > - if (!need_resched()) > + if (!need_resched()) { > =C2=A0 __mwait(eax, ecx); > + /* > + =C2=A0* idle could have cleared the return buffer, > + =C2=A0* so fill it to prevent uncontrolled > + =C2=A0* speculation. > + =C2=A0*/ > + fill_return_buffer(); > + } > =C2=A0 } > =C2=A0 current_clr_polling(); > =C2=A0} Probably doesn't matter right there but it's going to end up being used elsewhere with IBRS/IBPB, and the compiler is going to think it needs to save all the call-clobbered registers for that. 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