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=-5.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=no 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 8BDBFC4363A for ; Mon, 5 Oct 2020 15:28:33 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (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 F00AD20637 for ; Mon, 5 Oct 2020 15:28:32 +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="azF5mWxl" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F00AD20637 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 whitealder.osuosl.org (Postfix) with ESMTP id 7B6D384DE1; Mon, 5 Oct 2020 15:28:32 +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 hUxucZUn8WWY; Mon, 5 Oct 2020 15:28:31 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by whitealder.osuosl.org (Postfix) with ESMTP id 29C6284AB8; Mon, 5 Oct 2020 15:28:31 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id EA78EC07FF; Mon, 5 Oct 2020 15:28:30 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 0EE70C0051 for ; Mon, 5 Oct 2020 15:28:30 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 029B884BC2 for ; Mon, 5 Oct 2020 15:28:30 +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 jMJ9UFEFomdE for ; Mon, 5 Oct 2020 15:28:29 +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 E5C7384AB8 for ; Mon, 5 Oct 2020 15:28:28 +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:Date:Cc:To: From:Subject:Message-ID:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:In-Reply-To:References; bh=dFkgso4DV7mAFdVY77wdMaL2nqc+vFfAseQkT62QKIY=; b=azF5mWxlJrzpErgwCEWLNfLYXr YkAk6vHonHHNCW+5GFVc8Y0AvfGHMGT0Q1PdHV/OoIXDFZyBJ3Y7avI8aVx6GMWhPMj8WQnM+8pGk 55Q7BvnBYB+Z8gVvSQPaellG773V/aUWS4djpbdkwXzelgB1spHBfOdwA4/uVfzOOJ0Px8uglKekR bi32CnSwQJZaiyf88KslB3ZzTpPgVHeKxrRseZQkw87DPPsdV+05CT1x2oVcR6g4YQzmWoM3xnFQx s3C4vCGbMCXHwBvYJyG1+LFLH4bSeFPOZUp6H8QCZm29gljX9jQdCLMqJc+Bpls63Rz+pXo5OAhRh OGrWredQ==; Received: from 54-240-197-232.amazon.com ([54.240.197.232] helo=u3832b3a9db3152.ant.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kPSPa-0004Fx-7o; Mon, 05 Oct 2020 15:28:26 +0000 Message-ID: <77e64f977f559412f62b467fd062d051ea288f14.camel@infradead.org> Subject: [PATCH 0/13] Fix per-domain IRQ affinity, allow >255 CPUs on x86 without IRQ remapping From: David Woodhouse To: x86 Date: Mon, 05 Oct 2020 16:28:24 +0100 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="===============3824489732207510239==" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" --===============3824489732207510239== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-pl9UyMMd1jNvV8bNriR9" --=-pl9UyMMd1jNvV8bNriR9 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Linux currently refuses to use >255 CPUs on x86 unless it has interrupt remapping. This is a bit gratuitous because it could use those extra CPUs just fine; it just can't target external interrupts at them. The only problem is that our generic IRQ domain code cann't cope with the concept of domains which can only target a subset of CPUs. The hyperv-iommu IRQ remapping driver works around this =E2=80=94 not by actually doing any remapping, but just returning -EINVAL if the affinity is ever set to an unreachable CPU. This almost works, but ends up being a bit late because irq_set_affinity_locked() doesn't call into the irqchip driver immediately; the error only happens later. 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. While we're at it, recognise that the 8-bit limit is a bit gratuitous and a hypervisor could offer at least 15 bits of APIC ID in the IOAPIC RTE and MSI address bits 11-5 without even needing to use remapping. David Woodhouse (13): x86/apic: Use x2apic in guest kernels even with unusable CPUs. x86/msi: Only use high bits of MSI address for DMAR unit x86/ioapic: Handle Extended Destination ID field in RTE x86/apic: Support 15 bits of APIC ID in IOAPIC/MSI where available genirq: Prepare for default affinity to be passed to __irq_alloc_desc= s() genirq: Add default_affinity argument to __irq_alloc_descs() irqdomain: Add max_affinity argument to irq_domain_alloc_descs() genirq: Add irq_domain_set_affinity() x86/irq: Add x86_non_ir_cpumask x86/irq: Limit IOAPIC and MSI domains' affinity without IR x86/smp: Allow more than 255 CPUs even without interrupt remapping iommu/irq_remapping: Kill most of hyperv-iommu.c now it's redundant x86/kvm: Add KVM_FEATURE_MSI_EXT_DEST_ID Documentation/virt/kvm/cpuid.rst | 4 + arch/x86/include/asm/apic.h | 1 + arch/x86/include/asm/io_apic.h | 3 +- arch/x86/include/asm/mpspec.h | 2 + arch/x86/include/asm/x86_init.h | 2 + arch/x86/include/uapi/asm/kvm_para.h | 1 + arch/x86/kernel/apic/apic.c | 41 +++++++++- arch/x86/kernel/apic/io_apic.c | 23 ++++-- arch/x86/kernel/apic/msi.c | 44 +++++++++-- arch/x86/kernel/apic/x2apic_phys.c | 9 +++ arch/x86/kernel/kvm.c | 6 ++ arch/x86/kernel/x86_init.c | 1 + drivers/iommu/hyperv-iommu.c | 149 +------------------------------= ---- include/linux/interrupt.h | 2 + include/linux/irq.h | 10 ++- include/linux/irqdomain.h | 7 +- kernel/irq/devres.c | 8 +- kernel/irq/ipi.c | 2 +- kernel/irq/irqdesc.c | 29 ++++--- kernel/irq/irqdomain.c | 69 ++++++++++++++-- kernel/irq/manage.c | 19 ++++- 21 files changed, 240 insertions(+), 192 deletions(-) --=-pl9UyMMd1jNvV8bNriR9 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE 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