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 60AC7C4727E for ; Wed, 7 Oct 2020 07:49:02 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (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 C1D2F20B1F for ; Wed, 7 Oct 2020 07:48:59 +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="qENNS/4m" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C1D2F20B1F 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 silver.osuosl.org (Postfix) with ESMTP id 1A82F22D24; Wed, 7 Oct 2020 07:48:59 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id q7BSn77MiGQs; Wed, 7 Oct 2020 07:48:57 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by silver.osuosl.org (Postfix) with ESMTP id 44C3C2011A; Wed, 7 Oct 2020 07:48:57 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 2E2D9C07FF; Wed, 7 Oct 2020 07:48:57 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 3E245C0051 for ; Wed, 7 Oct 2020 07:48:56 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 2CF3A86A72 for ; Wed, 7 Oct 2020 07:48:56 +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 CovRVTc2yUVB for ; Wed, 7 Oct 2020 07:48:55 +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 536B486A6D for ; Wed, 7 Oct 2020 07:48:55 +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=ULNLuJX8ydiU99mozxAJU9DkyJYHanQB/3JYwBFyPoI=; b=qENNS/4mSczqO6CrQv8C19Fd1t +a+VsSA4HiJd9PNRRFmEoHTC3xTZxEs1PXEViFhRTL0tkUcEz/e/i0z/gQALbuBrARFwKRaoZAZxe tM5tXxv9hgOA3P05KaSyZFoEn18BWPoWZ1kv1zFjuPSqJSXHFtnPS7wPSWU5nbMeXTKWOCUZZXh6z YsuoTzhfvfSZIBcZr6RoZurKfseGmBusIQHoTutByAEgLgadDZ8bcttvTPhaQVLorPLH2Co5MNKX7 5yKB7MXAsLviwtPPWnyDOO01FwGqYPODnZvIQzLQ96xU3aJDgugKHcomCR5ttJOQZURbT29s1BUzW aJJ5FYQw==; 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 1kQ4Bw-0005fk-Oe; Wed, 07 Oct 2020 07:48:52 +0000 Message-ID: Subject: Re: [PATCH 10/13] x86/irq: Limit IOAPIC and MSI domains' affinity without IR From: David Woodhouse To: Thomas Gleixner , x86@kernel.org Date: Wed, 07 Oct 2020 08:48:51 +0100 In-Reply-To: <87d01v58bw.fsf@nanos.tec.linutronix.de> References: <77e64f977f559412f62b467fd062d051ea288f14.camel@infradead.org> <20201005152856.974112-1-dwmw2@infradead.org> <20201005152856.974112-10-dwmw2@infradead.org> <87d01v58bw.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="===============9001604696759498712==" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" --===============9001604696759498712== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-dUCVxM/N5P8DL/Jxk0HJ" --=-dUCVxM/N5P8DL/Jxk0HJ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2020-10-06 at 23:54 +0200, Thomas Gleixner wrote: > On Mon, Oct 05 2020 at 16:28, David Woodhouse wrote: >=20 > > From: David Woodhouse > >=20 > > When interrupt remapping isn't enabled, only the first 255 CPUs can >=20 > No, only CPUs with an APICid < 255 .... Ack. > > receive external interrupts. Set the appropriate max affinity for > > the IOAPIC and MSI IRQ domains accordingly. > >=20 > > This also fixes the case where interrupt remapping is enabled but some > > devices are not within the scope of any active IOMMU. >=20 > What? If this fixes an pre-existing problem then >=20 > 1) Explain the problem proper > 2) Have a patch at the beginning of the series which fixes it > independently of this pile >=20 > If it's fixing a problem in your pile, then you got the ordering wrong. It's not that simple; there's not a single patch which fixes that and which can go first. I can, and do, fix the "no IR" case in a simple patch that goes first, simply by restricting the kernel to the APIC IDs which can be targeted. This is the case I called out in the cover letter: This patch series implements a per-domain "maximum affinity" set and uses it for the non-remapped IOAPIC and MSI domains on x86. As well as allowing more CPUs to be used without interrupt remapping, this also fixes the case where some IOAPICs or PCI devices aren't actually in scope of any active IOMMU and are operating without remapping. To fix *that* case, we really do need the whole series giving us per- domain restricted affinity, and to use it for those MSIs/IOAPICs that the IRQ remapping doesn't cover. > You didn't start kernel programming as of yesterday, so you really know > how that works. >=20 > > ip->irqdomain->parent =3D parent; > > + if (parent =3D=3D x86_vector_domain) > > + irq_domain_set_affinity(ip->irqdomain, &x86_non_ir_cpumask); >=20 > OMG This IOAPIC function may or may not be behind remapping. >=20 > > if (cfg->type =3D=3D IOAPIC_DOMAIN_LEGACY || > > cfg->type =3D=3D IOAPIC_DOMAIN_STRICT) > > diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c > > index 4d891967bea4..af5ce5c4da02 100644 > > --- a/arch/x86/kernel/apic/msi.c > > +++ b/arch/x86/kernel/apic/msi.c > > @@ -259,6 +259,7 @@ struct irq_domain * __init native_create_pci_msi_do= main(void) > > pr_warn("Failed to initialize PCI-MSI irqdomain.\n"); > > } else { > > d->flags |=3D IRQ_DOMAIN_MSI_NOMASK_QUIRK; > > + irq_domain_set_affinity(d, &x86_non_ir_cpumask); >=20 > So here it's unconditional Yes, this code is only for the non-remapped case and there's a separate arch_create_remap_msi_irq_domain() function a few lines further down which creates the IR-PCI-MSI IRQ domain. So no need for a condition here. > > } > > return d; > > } > > @@ -479,6 +480,8 @@ struct irq_domain *hpet_create_irq_domain(int hpet_= id) > > irq_domain_free_fwnode(fn); > > kfree(domain_info); > > } > > + if (parent =3D=3D x86_vector_domain) > > + irq_domain_set_affinity(d, &x86_non_ir_cpumask); >=20 > And here we need a condition again. Completely obvious and reviewable - N= OT. And HPET may or may not be behind remapping so again needs the condition. 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