From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x224NkMYhnvv5haWZNUvqt44U4DUYWMSQ9JOByyFquK4o/wXUVjFS8NXWFtU0q2Avm9jKYSmf ARC-Seal: i=1; a=rsa-sha256; t=1516877587; cv=none; d=google.com; s=arc-20160816; b=R+inYNA3b58AKrk4mMoxtoqdz5rohrmT6X9ah1ZpXVtriBEvN593ilWKj4zeR9qrd2 NnHjyoobJH2ZPc6BKkhEHpN1Hz2hcd2r07mtBzpZmQFkQi/mp1gzydPUsYGSVGxmHEJQ 48SBEW3KqVo9l7Q5XnIzfQTLEca3vFHSSFOL9zqjV1GqVB/k8De8o7q5/8c/S0oirro/ vqV/xdu5Y3nh1TC9S/bwOkBkez515bOq4gTB3wcQm4yAUchFULFBhKT7AG8K0Zb+JL4X z2n8eCqeOpEvzhOkLF8G1KP60nVsxztgALePs6pPRDJsEGZ/oirHMUSkE0eFIGo2qppG O1Qg== 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=tE68QLjPFGNf+vehKwGHhuwVL/E5+wfl/plTNZpM35I=; b=XmKwdWPQB/33J1emK2hFHC4hAjih+8cEI37QyWqjmrQ8p2eVFSsHiH18XEuc4kiKNQ snFSulONCUODf3ymbHxAaYtYGK6W7C/9fDDSI6IyKg+Iq+zsr8O0znOCXtLwKpTmEZPI /9FpcWKX3ewtQNtOuQVz7MYAPSEHI23cG9oJ1bnbvQNr6qEMs6frpbSBh3/SG4FhmfCa ZS8SkY0ZGv1UybdVYizFV4XkmIE1KeVC1zgUVqA261MCTtfkoJ/n9q5nJRx1/KuRxNlH 6DFjOWEFC43bWM8TT98czuqPdJRTLj8z4JbG9Ml4XEFKGIjlAK3GDGwRqixdt3ZJU75S KCVA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=pn3ktD22; spf=pass (google.com: best guess record for domain of batv+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=pn3ktD22; spf=pass (google.com: best guess record for domain of batv+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1516877573.30244.54.camel@infradead.org> Subject: Re: [PATCH 03/24] x86/paravirt: Annotate indirect calls From: David Woodhouse To: Juergen Gross , Peter Zijlstra Cc: Thomas Gleixner , Josh Poimboeuf , 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: <81ade568-6ab3-a62a-5026-5138f2313ab3@suse.com> References: <20180123152539.374360046@infradead.org> <20180123152638.162540737@infradead.org> <1516874525.30244.41.camel@infradead.org> <20180125102253.GB2228@hirez.programming.kicks-ass.net> <81ade568-6ab3-a62a-5026-5138f2313ab3@suse.com> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-h1b6LBJwmP8xhYvs3tHp" Date: Thu, 25 Jan 2018 10:52:53 +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?1590561433608474237?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-h1b6LBJwmP8xhYvs3tHp Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-01-25 at 11:26 +0100, Juergen Gross wrote: > On 25/01/18 11:22, Peter Zijlstra wrote: > >=20 > > On Thu, Jan 25, 2018 at 10:02:05AM +0000, David Woodhouse wrote: > > >=20 > > > On Tue, 2018-01-23 at 16:25 +0100, Peter Zijlstra wrote: > > > >=20 > > > > Paravirt emits indirect calls which get flagged by objtool retpolin= e > > > > checks, annotate it away because all these indirect calls will be > > > > patched out before we start userspace. > > > I've seen this asserted repeatedly but I've never truly convinced > > > myself of it. Is this absolutely unconditionally true in every case, > > > even when we're running as a guest and there are *actual* calls to be > > > made? We turn them into direct calls, never leave them indirect? > > That is my understanding; and when I worked on the paravirt spinlock > > code and disassembled live guest code this seemed to have happend. > >=20 > > But let me go read the paravirt code again to make a stronger argument > > in favour. > >=20 > paravirt_patch_default() is the function you want to look at: it either > replaces the indirect call by some cutom code (which is never an > indirect call) or by a call of the target function. OK, my brain hurts a bit but I'm happy now. 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