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=-8.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=ham 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 109B7C4727E for ; Wed, 7 Oct 2020 07:26:06 +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 2AC2F20870 for ; Wed, 7 Oct 2020 07:26:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="SzZq0Q02" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2AC2F20870 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id A4B6E86204; Wed, 7 Oct 2020 07:26:04 +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 w8kaHRqdA6yP; Wed, 7 Oct 2020 07:26:04 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id 0E38586160; Wed, 7 Oct 2020 07:26:04 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id E4B35C07FF; Wed, 7 Oct 2020 07:26:03 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 79FE3C0051 for ; Wed, 7 Oct 2020 07:26:02 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 5E08C86A32 for ; Wed, 7 Oct 2020 07:26:02 +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 fjrHC3AvtGTA for ; Wed, 7 Oct 2020 07:26:01 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by whitealder.osuosl.org (Postfix) with ESMTPS id 4505386A31 for ; Wed, 7 Oct 2020 07:26:01 +0000 (UTC) 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=syUPKwqvv3fci5Hq35S7nX/yxZnCRe91ZJjttKg/EGo=; b=SzZq0Q027pjcgKN2Pgye+LowNv G674Vw8JM0+X4PRS/gV9Q1vWoY96ToLiYbJgLlUk/Hy0HLrdUbvB38LBHFhwe3FiPvEPnZp8Xvgci IoTM8SjbsAVVMFnCRPWGgsAMK7lov4TxmhW4AY2YhY1w909W4Iq0xHOc53Lr5MomdKuHfuTlGBOWR c7YvtOwrepp7A/+mP36gds3g+7txURI8wmGgFJ0pBooOyVL/mlzytHI0r97ZtFyak9sbL8IR68Fke IStrPa7Wc9LvQ4Ww7Q03Ljm695p7ebCxv++ydkMhVOVMLEeYaSwhs9MJtAoi+5XP1Ur66qgFHgiaK ukC/Godg==; Received: from dyn-229.woodhou.se ([90.155.92.229]) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kQ3pm-0003j2-FW; Wed, 07 Oct 2020 07:25:58 +0000 Message-ID: <3bc0d6d001b276f881310714fb59ea03ac0e5173.camel@infradead.org> Subject: Re: [PATCH 09/13] x86/irq: Add x86_non_ir_cpumask From: David Woodhouse To: Thomas Gleixner , x86@kernel.org Date: Wed, 07 Oct 2020 08:25:57 +0100 In-Reply-To: <87ft6r58vy.fsf@nanos.tec.linutronix.de> References: <77e64f977f559412f62b467fd062d051ea288f14.camel@infradead.org> <20201005152856.974112-1-dwmw2@infradead.org> <20201005152856.974112-9-dwmw2@infradead.org> <87ft6r58vy.fsf@nanos.tec.linutronix.de> 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 Cc: Paolo Bonzini , iommu , linux-hyperv@vger.kernel.org, kvm X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1517974047971287207==" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" --===============1517974047971287207== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-rhvX1BHXNHKXOa8UeZf1" --=-rhvX1BHXNHKXOa8UeZf1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2020-10-06 at 23:42 +0200, Thomas Gleixner wrote: > On Mon, Oct 05 2020 at 16:28, David Woodhouse wrote: > > From: David Woodhouse > >=20 > > This is the mask of CPUs to which IRQs can be delivered without > > interrupt > > remapping. > > =20 > > +/* Mask of CPUs which can be targeted by non-remapped interrupts. > > */ > > +cpumask_t x86_non_ir_cpumask =3D { CPU_BITS_ALL }; >=20 > What? By default, if we didn't hit any limits, all CPUs can be targeted by external interrupts. It's the default today. Or at least we pretend it is, modulo the bugs :) > > #ifdef CONFIG_X86_32 > > =20 > > /* > > @@ -1838,6 +1841,7 @@ static __init void x2apic_enable(void) > > static __init void try_to_enable_x2apic(int remap_mode) > > { > > u32 apic_limit =3D 0; > > + int i; > > =20 > > if (x2apic_state =3D=3D X2APIC_DISABLED) > > return; > > @@ -1880,6 +1884,14 @@ static __init void try_to_enable_x2apic(int rema= p_mode) > > if (apic_limit) > > x2apic_set_max_apicid(apic_limit); > > =20 > > + /* Build the affinity mask for interrupts that can't be remapped. */ > > + cpumask_clear(&x86_non_ir_cpumask); > > + i =3D min_t(unsigned int, num_possible_cpus() - 1, apic_limit); > > + for ( ; i >=3D 0; i--) { > > + if (cpu_physical_id(i) <=3D apic_limit) > > + cpumask_set_cpu(i, &x86_non_ir_cpumask); > > + } >=20 > Blink. If the APIC id is not linear with the cpu numbers then this > results in a reduced addressable set of CPUs. WHY? Hm, good question. That loop was cargo-culted from hyperv-iommu.c; perhaps it makes more sense there because Hyper-V really does promise that linearity, or perhaps it was already buggy. Will fix. In fact, in apic.c I could probably just use the cpuid_to_apicid array which is right there in the file. > > diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_a= pic.c > > index aa9a3b54a96c..4d0ef46fedb9 100644 > > --- a/arch/x86/kernel/apic/io_apic.c > > +++ b/arch/x86/kernel/apic/io_apic.c > > @@ -2098,6 +2098,8 @@ static int mp_alloc_timer_irq(int ioapic, int pin= ) > > struct irq_alloc_info info; > > =20 > > ioapic_set_alloc_attr(&info, NUMA_NO_NODE, 0, 0); > > + if (domain->parent =3D=3D x86_vector_domain) > > + info.mask =3D &x86_non_ir_cpumask; >=20 > We are not going to sprinkle such domain checks all over the > place. Again, the mask is a property of the interrupt domain. 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