From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x226LKCrTyvTJPhfTuXIZDkEwzKuJbNoLRRAfDRMcOxrnPBM+PWMK9uzo1EhrI03zbY1wXqDi ARC-Seal: i=1; a=rsa-sha256; t=1517249406; cv=none; d=google.com; s=arc-20160816; b=P5FysGxyoyL3QulYVJrAngSVxGFFoodu0Y/XTYTEn92rfXfBeAjzyD3YOcrOKL1SAq 5YjaKneDc4GNbVyUD7m0BltFNETeI2nhMNgZ31T3GF14NT6MOb7mqy7vfesvraoYayT6 tIiNLYTBzvUuqFP/GOk/cLQt8ATNDTrqO3DoNXqxuUSuOyInakVUY/F2EU//ofR/DPsv axhd9+T74JLLYQ00tLjQYZ09UcfoRFtSh9lK+T0b/rWXDYpsRiUTmMzwgScwJAWCP1G2 +W215GUbSyiVC2J53aiFmCazAlvMkhUEybku9E7Wvop3tonpt+hXhFyAAbWq8nl+6/W4 6now== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:date:face:references:in-reply-to:cc:to:from:subject :message-id:dkim-signature:arc-authentication-results; bh=wMf/w2Ukw6ypoEGfS6j4KX3dgQFU0v9FDY0Ov34au0c=; b=WJr+nzQV3QGbGfel5istlryRLCezad8BSjFedd7x35k2w5Wy6GrxtZFXR7BpDXL9UM M5NlU+/yrx7hqKT1OiRVXxkPGJ6yxV6+wFYiojOqMTDjY2bBOKl+2nBCFc/Ojw/UL5IE rppSBxwvLo14LyITWGOBW+BRtOA1EVOl8Qxw8mVt/08TNqEJFrO5S5gBfZ7NFDbubGSV ogosinHLSpYsCSK97GSrroEsDmEcm7V4cfIyz7DFA36/SSSiXEQ1bHbLjuxsroaH+EGP 54UXsP7Uyai0TFeZltsCKL7a1b4ndI2MSsuOEIIDb7aV0wiHBuVjfmduW7cjgaTluyNe +kTQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=keapcgTT; spf=pass (google.com: best guess record for domain of batv+012fdbe956077515f1b7+5272+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+012fdbe956077515f1b7+5272+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=keapcgTT; spf=pass (google.com: best guess record for domain of batv+012fdbe956077515f1b7+5272+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+012fdbe956077515f1b7+5272+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1517249375.18619.24.camel@infradead.org> Subject: Re: [PATCH 03/24] x86/paravirt: Annotate indirect calls From: David Woodhouse To: Josh Poimboeuf , Peter Zijlstra Cc: Thomas Gleixner , linux-kernel@vger.kernel.org, Dave Hansen , Ashok Raj , Tim Chen , Andy Lutomirski , Linus Torvalds , Greg KH , Andrea Arcangeli , Andi Kleen , Arjan Van De Ven , Dan Williams , Paolo Bonzini , Jun Nakajima , Asit Mallick , Jason Baron In-Reply-To: <20180129175858.4btnobcifaumc7g4@treble> References: <20180123152539.374360046@infradead.org> <20180123152638.162540737@infradead.org> <20180129175858.4btnobcifaumc7g4@treble> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-ylcRKC3UbiasewoEEwzB" Date: Mon, 29 Jan 2018 18:09:35 +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 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1590397845189698377?= X-GMAIL-MSGID: =?utf-8?q?1590951313666520923?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-ylcRKC3UbiasewoEEwzB Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2018-01-29 at 11:58 -0600, Josh Poimboeuf wrote: > On Tue, Jan 23, 2018 at 04:25:42PM +0100, Peter Zijlstra wrote: > >=20 > > Paravirt emits indirect calls which get flagged by objtool > > retpoline > > checks, annotate it away because all these indirect calls will be > > patched out before we start userspace. > >=20 > > Signed-off-by: Peter Zijlstra (Intel) > > --- > > =C2=A0arch/x86/include/asm/paravirt.h=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0|=C2=A0=C2=A0=C2=A022 ++++++++++++++++++--- > > - > > =C2=A0arch/x86/include/asm/paravirt_types.h |=C2=A0=C2=A0=C2=A0=C2=A07 = ++++++- > > =C2=A02 files changed, 24 insertions(+), 5 deletions(-) > >=20 > > --- a/arch/x86/include/asm/paravirt.h > > +++ b/arch/x86/include/asm/paravirt.h > > @@ -828,6 +828,12 @@ extern void default_banner(void); > > =C2=A0 =C2=A0.short clobbers; \ > > =C2=A0 .popsection > > =C2=A0 > > +#define PARA_RETPOLINE_SAFE \ > > + 773:; \ > > + .pushsection .discard.retpoline_safe; \ > > + _ASM_PTR 773b; \ > > + .popsection > > Why does paravirt have its own version of this macro? 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