From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4106BC63798 for ; Fri, 20 Nov 2020 12:16:27 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 65CFA2158C for ; Fri, 20 Nov 2020 12:16:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=suse.com header.i=@suse.com header.b="ILqKfaoh" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 65CFA2158C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lists.linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=virtualization-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id C249586E5C; Fri, 20 Nov 2020 12:16:25 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kD43iaDlO4Wc; Fri, 20 Nov 2020 12:16:24 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id 9AF4C86A84; Fri, 20 Nov 2020 12:16:24 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 7C6CCC163C; Fri, 20 Nov 2020 12:16:24 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id E10A9C0891 for ; Fri, 20 Nov 2020 12:16:22 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id C09268714B for ; Fri, 20 Nov 2020 12:16:22 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iu7p6S3+Gmsi for ; Fri, 20 Nov 2020 12:16:21 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by whitealder.osuosl.org (Postfix) with ESMTPS id 8B3C487143 for ; Fri, 20 Nov 2020 12:16:21 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1605874580; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=YefhziZmkc//JJPRQ3LwkHDQuojnCOZiaUec095OI04=; b=ILqKfaohLJK8dicHB14Kgv92XrND/IT0Xe8mqjbqLssK5A+dRatdi5sXW7J6K+oCUoK7fz 5p12xurhl/C/BUJ2g05j0XkM9uGNJk/Ds20Cw3oFy0nfvZZrSjqW2j0pGZZEBxo4KA4ZOi q/rkJsUnGvHyvBpLwcKIpeqmJDzgvH0= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 1C1E4AD5C; Fri, 20 Nov 2020 12:16:20 +0000 (UTC) Subject: Re: [PATCH v2 08/12] x86/paravirt: remove no longer needed 32-bit pvops cruft To: Peter Zijlstra References: <20201120114630.13552-1-jgross@suse.com> <20201120114630.13552-9-jgross@suse.com> <20201120120805.GF3021@hirez.programming.kicks-ass.net> Message-ID: <5c123e7f-299d-2a4c-3e30-878537d71546@suse.com> Date: Fri, 20 Nov 2020 13:16:19 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0 MIME-Version: 1.0 In-Reply-To: <20201120120805.GF3021@hirez.programming.kicks-ass.net> Cc: "VMware, Inc." , x86@kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, Ingo Molnar , Borislav Petkov , luto@kernel.org, "H. Peter Anvin" , xen-devel@lists.xenproject.org, Thomas Gleixner X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= via Virtualization Reply-To: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Content-Type: multipart/mixed; boundary="===============1396838165289504477==" Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --===============1396838165289504477== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="a2dWOuOmbtLJqOPjTKdEeUzEma86pRL3J" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --a2dWOuOmbtLJqOPjTKdEeUzEma86pRL3J Content-Type: multipart/mixed; boundary="PNbjwsjbyz3PMr6RwhSIwf66NdqTWYnze"; protected-headers="v1" From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= To: Peter Zijlstra Cc: xen-devel@lists.xenproject.org, x86@kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, luto@kernel.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Deep Shah , "VMware, Inc." Message-ID: <5c123e7f-299d-2a4c-3e30-878537d71546@suse.com> Subject: Re: [PATCH v2 08/12] x86/paravirt: remove no longer needed 32-bit pvops cruft References: <20201120114630.13552-1-jgross@suse.com> <20201120114630.13552-9-jgross@suse.com> <20201120120805.GF3021@hirez.programming.kicks-ass.net> In-Reply-To: <20201120120805.GF3021@hirez.programming.kicks-ass.net> --PNbjwsjbyz3PMr6RwhSIwf66NdqTWYnze Content-Type: multipart/mixed; boundary="------------648324777AF01D39B6723412" Content-Language: en-US This is a multi-part message in MIME format. --------------648324777AF01D39B6723412 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 20.11.20 13:08, Peter Zijlstra wrote: > On Fri, Nov 20, 2020 at 12:46:26PM +0100, Juergen Gross wrote: >> +#define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr, ...) = \ >> ({ \ >> PVOP_CALL_ARGS; \ >> PVOP_TEST_NULL(op); \ >> + BUILD_BUG_ON(sizeof(rettype) > sizeof(unsigned long)); \ >> + asm volatile(paravirt_alt(PARAVIRT_CALL) \ >> + : call_clbr, ASM_CALL_CONSTRAINT \ >> + : paravirt_type(op), \ >> + paravirt_clobber(clbr), \ >> + ##__VA_ARGS__ \ >> + : "memory", "cc" extra_clbr); \ >> + (rettype)(__eax & PVOP_RETMASK(rettype)); \ >> }) >=20 > This is now very similar to ____PVOP_VCALL() (note how PVOP_CALL_ARGS i= s > PVOP_VCALL_ARGS). >=20 > Could we get away with doing something horrible like: >=20 > #define ____PVOP_VCALL(X...) (void)____PVOP_CALL(long, X) >=20 > ? Oh, indeed. And in patch 9 the same could be done for the ALT variants. 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