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 06486C6FD1D for ; Mon, 27 Mar 2023 16:57:10 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pgq9P-0006vI-5x; Mon, 27 Mar 2023 12:56:55 -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 1pgq9M-0006uc-MS for qemu-devel@nongnu.org; Mon, 27 Mar 2023 12:56:52 -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 1pgq9K-0001SA-1h for qemu-devel@nongnu.org; Mon, 27 Mar 2023 12:56:52 -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=KuWoYXhRxce6obX5o6zCz0abl2g1t8ptuhaSVMpgVCU=; b=js98/kFOm63pV4F3FFzjPORYJf NHG2QdqVZXHaR4/HYk64Y8qJKF7eiWVpwPgMulsyH+RQ9pPD2HwqhpzXvQtM+emM18UBriUAQ6R0r Q1DlfukXxDUEtDkLYlBJDl3e51pLnNDY3zWObfEQjUPW2YUNmIpRZXw2d4UDLiRZLJRnmCwz4oI4t qhC4+tJL7WRe79Bvd8fSDV1t4+eMZrH/W2kkT74Ga7JUuMcE1rwy2PkmRezyifUP7zYs0jBOVSD/N n8Ouw5TXthc5KPtkKQiNJIGZpG/3jBfQaRMET2b0TKXmzwk5kfF7V7JKqCguQn35uKREL6Cq60h3T WZ6bjHzQ==; 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 1pgq9F-007ZWV-Gs; Mon, 27 Mar 2023 16:56:45 +0000 Message-ID: Subject: Re: [PATCH v2 1/5] i386/tcg: implement x2APIC registers MSR access 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 17:56:43 +0100 In-Reply-To: <20230326052039.33717-2-minhquangbui99@gmail.com> References: <20230326052039.33717-1-minhquangbui99@gmail.com> <20230326052039.33717-2-minhquangbui99@gmail.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-9YaD7e/jrtx3KTy5e9nO" 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 --=-9YaD7e/jrtx3KTy5e9nO Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sun, 2023-03-26 at 12:20 +0700, Bui Quang Minh wrote: >=20 > +static void apic_mem_write(void *opaque, hwaddr addr, uint64_t val, > +=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 unsigned size) > +{ > +=C2=A0=C2=A0=C2=A0 int index =3D (addr >> 4) & 0xff; > + > +=C2=A0=C2=A0=C2=A0 if (size < 4) { > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return; > +=C2=A0=C2=A0=C2=A0 } > + > +=C2=A0=C2=A0=C2=A0 if (addr > 0xfff || !index) { > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* MSI and MMIO APIC are at t= he same memory location, > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * but actually not on t= he global bus: MSI is on PCI bus > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * APIC is connected dir= ectly to the CPU. > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * Mapping them on the g= lobal bus happens to work because > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * MSI registers are res= erved in APIC MMIO and vice versa. > */ > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 MSIMessage msi =3D { .address= =3D addr, .data =3D val }; > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 apic_send_msi(&msi); > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return; > +=C2=A0=C2=A0=C2=A0 } I know you're just moving this bit around, but note that it means we *can't* implement the 15-bit MSI trick as things stand, because those extra 7 bits end up in bits 4-11 of the address, and that means the 'addr > 0xfff' check isn't correct any more. However, that's only relevant in X2APIC mode... and there's no MMIO access to registers in X2APIC mode. So the check could perhaps become something like... DeviceState *apic =3D cpu_get_current_apic(); if (!apic || is_x2apic_mode(apic) || addr > 0xfff || !index) { /* MSI and MMIO APIC are at the same memory location, * but actually not on the global bus: MSI is on PCI bus * APIC is connected directly to the CPU. * Mapping them on the global bus happens to work because * MSI registers are reserved in xAPIC MMIO and vice versa. * In X2APIC mode, there is no MMIO and bits 4-11 of the * address *might* be used to encode the extended dest ID. */ MSIMessage msi =3D ... --=-9YaD7e/jrtx3KTy5e9nO 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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