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 17EF1C64EC4 for ; Mon, 6 Mar 2023 16:50:54 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pZE2s-0003aB-Ll; Mon, 06 Mar 2023 11:50:42 -0500 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 1pZE2r-0003Zj-5T for qemu-devel@nongnu.org; Mon, 06 Mar 2023 11:50:41 -0500 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 1pZE2o-0007zR-1a for qemu-devel@nongnu.org; Mon, 06 Mar 2023 11:50:40 -0500 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=Jug9oLSf85yWh5A0IumJTnH+XfwI/oIDYdxnUm2JKfU=; b=t7D/++dFI0dxwcsQ+Yhs+4z6Vx m5OfoOTD1f9UBEHaIwpASZGrDmFVqSSqQLLtamO/PmJ+9QgN0arhTrbLeUcR3g3+Ilw4Wh3FQcBKr HO3wSQYkatrKcsVTUOJ9jNsOI6NoxuDfPMuKk40rCpBpwzoZLepVMYrA9UOBpYFmBpUzao1e5tQn6 +QTbm8i0kl90mnARaVKbgNJwbWYTZQxyVTPY9sZoW9lMtVQ1izVq8Kj9W7wDwkLdm8E89ziC3Vf7R L9IHYBgWaCToo5TLPp4RcHSKb2bWIZGM+oTdVbDt1D7luHPWan8wyTGMpodYSsgxF6778zpdrzfzy JwzbtiEg==; Received: from [2001:8b0:10b:5:c09:fa3d:b1cb:4d7e] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pZE2g-005VOs-N3; Mon, 06 Mar 2023 16:50:31 +0000 Message-ID: <9da78e3b051ce3d9c857b793fe879f917cb518cb.camel@infradead.org> Subject: Re: [PATCH 1/4] apic: add support for x2APIC mode From: David Woodhouse To: Bui Quang Minh , Igor Mammedov Cc: qemu-devel@nongnu.org, Paolo Bonzini , Richard Henderson , Eduardo Habkost , "Michael S . Tsirkin" , Marcel Apfelbaum Date: Mon, 06 Mar 2023 16:50:29 +0000 In-Reply-To: References: <20230221160500.30336-1-minhquangbui99@gmail.com> <20230221160500.30336-2-minhquangbui99@gmail.com> <20230224152932.1de436cb@imammedo.users.ipa.redhat.com> <20230227170759.12297901@imammedo.users.ipa.redhat.com> <20230228173954.6a7b6c4f@imammedo.users.ipa.redhat.com> <71d9e801-80b2-d5ed-4c02-b328f0b175d4@gmail.com> <20230306114331.531c9cd2@imammedo.users.ipa.redhat.com> <96f1f670d576dbb1969055353b9e7b5a8632a4c8.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-mw9eb/RDZ6t+M0MIrljE" 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+ff41e94de7101eaa820e+7134+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 --=-mw9eb/RDZ6t+M0MIrljE Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2023-03-06 at 23:39 +0700, Bui Quang Minh wrote: > On 3/6/23 22:51, David Woodhouse wrote: > > On Mon, 2023-03-06 at 11:43 +0100, Igor Mammedov wrote: > > > > However, there are still problems while trying to extending support= to > > > > APIC ID larger than 255 because there are many places assume APIC I= D is > > > > 8-bit long. > > >=20 > > > that's what I was concerned about (i.e. just enabling x2apic without = fixing > > > with all code that just assumes 8bit apicid). > >=20 > > Even before you extend the physical APIC IDs past 254 or 255, there's > > still the issue that 255 isn't a broadcast in X2APIC mode. And that > > *logical* addressing will use more than 8 bits even when the physical > > IDs are lower. > >=20 > > > > One of that is interrupt remapping which returns 32-bit > > > > destination ID but uses MSI (which has 8-bit destination) to send t= o > > > > APIC. I will look more into this. > >=20 > > The translated 'output' from the interrupt remapping doesn't "use MSI", > > in the sense of a write transaction which happens to go to addresses in > > the 0x00000000FEExxxxx range. The *input* to interrupt remapping comes > > from that intercept. > >=20 > > The output is already "known" to be an MSI message, with a full 64-bit > > address and 32-bit data, and the KVM API puts the high 24 bits of the > > target APIC ID into the high word of the address. > >=20 > > If you look at the "generic" x86_iommu_irq_to_msi_message() in > > hw/intc/x86-iommu.c you'll see it's also using the same trick: > >=20 > > =C2=A0=C2=A0=C2=A0=C2=A0 msg.__addr_hi =3D irq->dest & 0xffffff00; >=20 > Yeah, I see that trick too, with this hunk and temporarily disable=20 > broadcast destination id 0xff in physical mode, I am able to boot Linux= =20 > with 255 CPUs (I can't see how to use few CPUs but configure with high= =20 > APIC ID) I never worked out how to explicitly assign high APIC IDs but you can at least spread them out by explicitly setting the topology to something weird like sockets=3D17,cores=3D3,threads=3D3 so that some APIC I= Ds get skipped. Of course, that doesn't let you exercise the interesting corner case of physical APIC ID 0xff though. I wonder if there's a way of doing it such that only CPU#0 and CPU#255 are *online* at boot, even if the rest theoretically exist?=20 > @@ -814,7 +816,12 @@ static void apic_send_msi(MSIMessage *msi) > =C2=A0 { > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 uint64_t addr =3D msi->address; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 uint32_t data =3D msi->data; > -=C2=A0=C2=A0=C2=A0 uint8_t dest =3D (addr & MSI_ADDR_DEST_ID_MASK) >> MS= I_ADDR_DEST_ID_SHIFT; > +=C2=A0=C2=A0=C2=A0 uint32_t dest =3D (addr & MSI_ADDR_DEST_ID_MASK) >> M= SI_ADDR_DEST_ID_SHIFT; > +=C2=A0=C2=A0=C2=A0 /* > +=C2=A0=C2=A0=C2=A0=C2=A0 * The higher 3 bytes of destination id is store= d in higher word of > +=C2=A0=C2=A0=C2=A0=C2=A0 * msi address. See x86_iommu_irq_to_msi_message= () > +=C2=A0=C2=A0=C2=A0=C2=A0 */ > +=C2=A0=C2=A0=C2=A0 dest =3D dest | (addr >> 32); >=20 > I am reading the manual now, looks like broadcast destination id in=20 > x2APIC is 0xffff_ffff in both physical and logic mode. 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