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 EB507C41604 for ; Wed, 7 Oct 2020 15:05:49 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (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 F300A20797 for ; Wed, 7 Oct 2020 15:05:47 +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="ssPgUyWx" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F300A20797 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 hemlock.osuosl.org (Postfix) with ESMTP id 6CC9C87270; Wed, 7 Oct 2020 15:05:47 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vd6kUoQWX2RR; Wed, 7 Oct 2020 15:05:46 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by hemlock.osuosl.org (Postfix) with ESMTP id D08608726D; Wed, 7 Oct 2020 15:05:46 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id B3CB6C016F; Wed, 7 Oct 2020 15:05:46 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id C236DC0051 for ; Wed, 7 Oct 2020 15:05:44 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 9741A22E89 for ; Wed, 7 Oct 2020 15:05:44 +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 ouazxTVHFLT0 for ; Wed, 7 Oct 2020 15:05:43 +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 silver.osuosl.org (Postfix) with ESMTPS id 353FF22DE3 for ; Wed, 7 Oct 2020 15:05:43 +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=zKWQA2yAGaqmOghYt+avcm6yMnvKPMDscc2xQM1eST0=; b=ssPgUyWxRLnNHQbQHmXgBuUXPW Hb0jhsa+zkRx1CfKdHpHAem0MJrqUzthEebC9llCzhdclaNn9ww1em0AmyQwZVHvCrqZSeQPrQml4 kUqEvWGl4i869KNcV7hkPdxbtjOALY4F3pgmf70U5ecga8+y/aRmY7bRAYU+ILv1ulYkxJmicx4a5 AIIR3vCFaev0m8FQh9H46SChZwSgZnTyCDVmLtYrB3mKK3YEiIPcAMODeO8k7Eld9ZYKWeitC2UbP gvS9ebMxU6qsdwcRm5oiWIyf3JH2JpFFNSPleiRSpIRT6nbmZISNChhmhO95D9dx80AiAK2Ia+jV8 0NFHnLqg==; Received: from [54.239.6.186] (helo=freeip.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kQB0d-0001KO-BQ; Wed, 07 Oct 2020 15:05:39 +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 16:05:37 +0100 In-Reply-To: <87imbm3zdq.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> <874kn65h0r.fsf@nanos.tec.linutronix.de> <87imbm3zdq.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="===============3077350010129915361==" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" --===============3077350010129915361== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-aoPIaLB26Ua2Cx3xlBo2" --=-aoPIaLB26Ua2Cx3xlBo2 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2020-10-07 at 16:05 +0200, Thomas Gleixner wrote: > > > The information has to property of the relevant irq domains and the > > > hierarchy allows you nicely to retrieve it from there instead of > > > sprinkling this all over the place. > >=20 > > No. This is not a property of the parent domain per se. Especially if > > you're thinking that we could inherit the affinity mask from the > > parent, then twice no. > >=20 > > This is a property of the MSI domain itself, and how many bits of > > destination ID the hardware at *this* level can interpret and pass on > > to the parent domain. >=20 > Errm what? >=20 > The MSI domain does not know anything about what the underlying domain > can handle and it shouldn't. >=20 > If MSI is on top of remapping then the remapping domain defines what the > MSI domain can do and not the other way round. Ditto for the non > remapped case in which the vector domain decides. >=20 > The top most MSI irq chip does not even have a compose function, neither > for the remap nor for the vector case. The composition is done by the > parent domain from the data which the parent domain constructed. Same > for the IO/APIC just less clearly separated. >=20 > The top most chip just takes what the underlying domain constructed and > writes it to the message store, because that's what the top most chip > controls. It does not control the content. Sure, whatever. The way we arrange the IRQ domain hierarchy in x86 Linux doesn't really match my understanding of the real hardware, or how qemu emulates it either. But it is at least internally self- consistent, and in this model it probably does make some sense to claim the 8-bit limit on x86_vector_domain itself, and *remove* that limit in the remapping irqdomain. Not really the important part to deal with right now, either way. --=-aoPIaLB26Ua2Cx3xlBo2 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q cXuzkOpibq2YurVStHAiGqAOMGMXhcVGqPuGhcVcVzVUjsvEzAV9Po9K2rpZ52FE4rDkpDK1pBK+ 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