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 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7BFF8C6FD1D for ; Mon, 27 Mar 2023 16:50:39 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pgq25-0004LG-Ip; Mon, 27 Mar 2023 12:49:21 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pgq23-0004Jr-7o for qemu-devel@nongnu.org; Mon, 27 Mar 2023 12:49:19 -0400 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pgq1z-0007u1-W7 for qemu-devel@nongnu.org; Mon, 27 Mar 2023 12:49:18 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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=hfG+zUs9YdvqJYlyJCvO3gYf23cdNEBI1XWBk3ZSRIo=; b=PQtqlJx6FqHfbzDsIEy3bhS0DD X2Gz2DcBpa2qM4NjIXVbf/s0UutZEJtKfLv7EhtcSI7Pvb1OReaBETMjxIsoKxKhGfbaIaNiuoGmL /s/OlYU2B7iKOOBqXChg5rALfh+aIUzSZ+/yZMUy5xc6YimMOR/n2nehhn5wAw79PkQfTheZQbSbX phbK9bKd2jEVQX5z5SZo54xiK+cwciTtI6eBrq3JO+tqqU03+BTik422sxylEfpOEOowTJK7ezxIx Cit6vJRK1qll6w+iBwjNdMJG550KW/chL69RnKEogV0XXGkzzEPFQ6PArd2TUXcbw5CLiaL32vGzL RyWja0UQ==; Received: from [2001:8b0:10b:5:bd73:4bc:634b:34b] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pgq1r-007ZAP-Qg; Mon, 27 Mar 2023 16:49:08 +0000 Message-ID: Subject: Re: [PATCH v2 2/5] apic: add support for x2APIC mode From: David Woodhouse To: Bui Quang Minh , qemu-devel@nongnu.org Cc: Paolo Bonzini , Richard Henderson , Eduardo Habkost , "Michael S . Tsirkin" , Marcel Apfelbaum , Igor Mammedov , Alex =?ISO-8859-1?Q?Benn=E9e?= Date: Mon, 27 Mar 2023 17:49:06 +0100 In-Reply-To: <445928d9-4cd3-978d-ce76-9cd01457b6f0@gmail.com> References: <20230326052039.33717-1-minhquangbui99@gmail.com> <20230326052039.33717-3-minhquangbui99@gmail.com> <05d55576-f703-18a1-7f9f-4c15b8c54490@gmail.com> <0944a6f4c7c1569c182a27d40bdeb0a164a41bbb.camel@infradead.org> <61446cfb-f937-3a0d-2a98-34febcc7e4f3@gmail.com> <3834475953c0f865e88251886f1e861d51c25a2b.camel@infradead.org> <445928d9-4cd3-978d-ce76-9cd01457b6f0@gmail.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-eWMsq0eT7LTouwhtzN38" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+ef3f5c3582df506c1a4c+7155+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-eWMsq0eT7LTouwhtzN38 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2023-03-27 at 23:35 +0700, Bui Quang Minh wrote: > On 3/27/23 23:22, David Woodhouse wrote: > > On Mon, 2023-03-27 at 22:45 +0700, Bui Quang Minh wrote: > > >=20 > > > > Maybe I'm misreading the patch, but to me it looks that > > > > if (dest =3D=3D 0xff) apic_get_broadcast_bitmask() bit applies even= in > > > > x2apic mode? So delivering to the APIC with physical ID 255 will be > > > > misinterpreted as a broadcast? > > >=20 > > > In case dest =3D=3D 0xff the second argument to apic_get_broadcast_bi= tmask > > > is set to false which means this is xAPIC broadcast > >=20 > > Yeah, but it *isn't* xAPIC broadcast. It's X2APIC unicast to APIC#255. > >=20 > > I think you want (although you don't have 'dev') something like this: > >=20 > >=20 > > static void apic_get_delivery_bitmask(uint32_t *deliver_bitmask, > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 uint32_t dest, uint8_t dest_mode) > > { > > =C2=A0=C2=A0=C2=A0=C2=A0 APICCommonState *apic_iter; > > =C2=A0=C2=A0=C2=A0=C2=A0 int i; > >=20 > > =C2=A0=C2=A0=C2=A0=C2=A0 memset(deliver_bitmask, 0x00, max_apic_words *= sizeof(uint32_t)); > >=20 > > =C2=A0=C2=A0=C2=A0=C2=A0 /* x2APIC broadcast id for both physical and l= ogical (cluster) mode */ > > =C2=A0=C2=A0=C2=A0=C2=A0 if (dest =3D=3D 0xffffffff) { > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 apic_get_broadcast_bit= mask(deliver_bitmask, true); > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return; > > =C2=A0=C2=A0=C2=A0=C2=A0 } > >=20 > > =C2=A0=C2=A0=C2=A0=C2=A0 if (dest_mode =3D=3D 0) { > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 apic_find_dest(deliver= _bitmask, dest); > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Broadcast to xAPIC = mode apics */ > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (dest =3D=3D 0xff) { > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (dest =3D=3D 0xff && is_= x2apic_mode(dev)) { > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 apic_get_broadcast_bitmask(deliver_bitmask, false); > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } > > =C2=A0=C2=A0=C2=A0=C2=A0 } else { > >=20 >=20 > Hmm, the unicast case is handled in apic_find_dest function, the logic= =20 > inside the if (dest =3D=3D 0xff) is for handling the broadcast case only. > This is because when dest =3D=3D 0xff, it can be both a x2APIC unicast an= d=20 > xAPIC broadcast in case we have some CPUs that are in xAPIC and others= =20 > are in x2APIC. Ah! Yes, I see it now. Shouldn't apic_get_broadcast_bitmask(=E2=80=A6 true) add *all* APICs to the mask, regardless of their mode? An APIC which is still in xAPIC mode will only look at the low 8 bits and see 0xFF which it also interprets as broadcast? Or is that not how real hardware behaves? > Do you think the code here is tricky and hard to read? Well, I completely failed to read it... :) I think changing the existing comment something like this might help... - /* Broadcast to xAPIC mode apics */ + /* Any APIC in xAPIC mode will interpret 0xFF as broadcast */ Coupled with a comment on apic_get_delivery_bitmask() clarifying that it depends on the mode of each APIC it considers =E2=80=94 which is obvious enough in retrospect now I read the code and you point it out to me, but empirically, we have to concede that it wasn't obvious *enough* :) --=-eWMsq0eT7LTouwhtzN38 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 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