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=-5.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 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 4BE7DC55178 for ; Sun, 25 Oct 2020 10:26:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C6DAB22269 for ; Sun, 25 Oct 2020 10:26:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ToY6/cu2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1415109AbgJYK03 (ORCPT ); Sun, 25 Oct 2020 06:26:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39330 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1414861AbgJYK02 (ORCPT ); Sun, 25 Oct 2020 06:26:28 -0400 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 843EBC0613CE; Sun, 25 Oct 2020 03:26:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Mime-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=K9kntGHFOsOEm1g+OgHWZFiKuRmTvWdOaA5xA4LyyM4=; b=ToY6/cu2DHsTZwhtPoe4SXBuAq UW+4v6WdANnJ7+ExOU1FaPL+2hfuamOyVZ9c8XiaETYmYTTkS6LNzbJvX9pbTBpCJe1WC94JtwGwC xqYLHl8/1PLX2FqjxFGh9AvWwqODtYidPhPG/chaR/B6LO2zht+POZaykj0RxZ7ZyyD8tCJZpY4ZQ xaKVRFtYKKVvkeiknKC5UUvFI82xS3nopTuGffavgNzsvEQ5Mzk97+il8ql97IKGndjQ/aJc90XQs pl69aKPPTE4QpeVXkuO/7xqpR7FjqfEh5EH3lgipCKFtX3STcOX864Z90Ygu3Okqb13HgHg0P4d7+ 1UjXsDTA==; Received: from 54-240-197-234.amazon.com ([54.240.197.234] helo=u3832b3a9db3152.ant.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kWdE9-0000Fl-FN; Sun, 25 Oct 2020 10:26:17 +0000 Message-ID: Subject: Re: [PATCH v3 17/35] x86/pci/xen: Use msi_msg shadow structs From: David Woodhouse To: David Laight , "x86@kernel.org" Cc: kvm , "iommu@lists.linux-foundation.org" , "joro@8bytes.org" , Thomas Gleixner , Paolo Bonzini , linux-kernel , "linux-hyperv@vger.kernel.org" , "maz@misterjones.org" , Dexuan Cui Date: Sun, 25 Oct 2020 10:26:14 +0000 In-Reply-To: <3e69326016524d97bcdea35d0765cc68@AcuMS.aculab.com> References: <20201024213535.443185-1-dwmw2@infradead.org> <20201024213535.443185-18-dwmw2@infradead.org> <3e69326016524d97bcdea35d0765cc68@AcuMS.aculab.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-S2N3L7aHbJOqt6NgSCe8" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org --=-S2N3L7aHbJOqt6NgSCe8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sun, 2020-10-25 at 09:49 +0000, David Laight wrote: > Just looking at a random one of these patches... >=20 > Does the compiler manage to optimise that reasonably? > Or does it generate a lot of shifts and masks as each > bitfield is set? >=20 > The code generation for bitfields is often a lot worse > that that for |=3D setting bits in a word. Indeed, it appears to be utterly appalling. That was one of my motivations for doing it with masks and shifts in the first place. Because in ioapic_setup_msg_from_msi(), for example, these two are consecutive in both source and destination: entry->vector =3D msg.arch_data.vector; entry->delivery_mode =3D msg.arch_data.delivery_mode; And so are those: entry->ir_format =3D msg.arch_addr_lo.dmar_format; entry->ir_index_0_14 =3D msg.arch_addr_lo.dmar_index_0_14; But GCC 7.5.0 here is doing them all separately... 00000000000011e0 : { 11e0: 53 push %rbx 11e1: 48 89 f3 mov %rsi,%rbx 11e4: 48 83 ec 18 sub $0x18,%rsp irq_chip_compose_msi_msg(irq_data, &msg); 11e8: 48 89 e6 mov %rsp,%rsi { 11eb: 65 48 8b 04 25 28 00 mov %gs:0x28,%rax 11f2: 00 00=20 11f4: 48 89 44 24 10 mov %rax,0x10(%rsp) 11f9: 31 c0 xor %eax,%eax irq_chip_compose_msi_msg(irq_data, &msg); 11fb: e8 00 00 00 00 callq 1200 entry->vector =3D msg.arch_data.vector; 1200: 0f b6 44 24 08 movzbl 0x8(%rsp),%eax entry->delivery_mode =3D msg.arch_data.delivery_mode; 1205: 0f b6 53 01 movzbl 0x1(%rbx),%edx 1209: 0f b6 74 24 09 movzbl 0x9(%rsp),%esi entry->vector =3D msg.arch_data.vector; 120e: 88 03 mov %al,(%rbx) entry->dest_mode_logical =3D msg.arch_addr_lo.dest_mode_logi= cal; 1210: 0f b6 04 24 movzbl (%rsp),%eax entry->delivery_mode =3D msg.arch_data.delivery_mode; 1214: 83 e2 f0 and $0xfffffff0,%edx 1217: 83 e6 07 and $0x7,%esi entry->dest_mode_logical =3D msg.arch_addr_lo.dest_mode_logi= cal; 121a: 09 f2 or %esi,%edx 121c: 8d 0c 00 lea (%rax,%rax,1),%ecx entry->ir_format =3D msg.arch_addr_lo.dmar_format; 121f: c0 e8 04 shr $0x4,%al entry->dest_mode_logical =3D msg.arch_addr_lo.dest_mode_logi= cal; 1222: 83 e1 08 and $0x8,%ecx 1225: 09 ca or %ecx,%edx 1227: 88 53 01 mov %dl,0x1(%rbx) entry->ir_format =3D msg.arch_addr_lo.dmar_format; 122a: 89 c2 mov %eax,%edx entry->ir_index_0_14 =3D msg.arch_addr_lo.dmar_index_0_1= 4; 122c: 8b 04 24 mov (%rsp),%eax 122f: 83 e2 01 and $0x1,%edx 1232: c1 e8 05 shr $0x5,%eax 1235: 66 25 ff 7f and $0x7fff,%ax 1239: 8d 0c 00 lea (%rax,%rax,1),%ecx 123c: 66 c1 e8 07 shr $0x7,%ax 1240: 88 43 07 mov %al,0x7(%rbx) 1243: 09 ca or %ecx,%edx } 1245: 48 8b 44 24 10 mov 0x10(%rsp),%rax 124a: 65 48 33 04 25 28 00 xor %gs:0x28,%rax 1251: 00 00=20 entry->ir_index_0_14 =3D msg.arch_addr_lo.dmar_index_0_1= 4; 1253: 88 53 06 mov %dl,0x6(%rbx) } 1256: 75 06 jne 125e 1258: 48 83 c4 18 add $0x18,%rsp 125c: 5b pop %rbx 125d: c3 retq =20 125e: e8 00 00 00 00 callq 1263 1263: 0f 1f 00 nopl (%rax) 1266: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 126d: 00 00 00=20 Still, this isn't really a fast path so I'm content to file the GCC PR for the really *obvious* misses and let it take its course. --=-S2N3L7aHbJOqt6NgSCe8 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG 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