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=-10.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,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 BD7C8C4363D for ; Wed, 7 Oct 2020 14:24:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5AEB8212CC for ; Wed, 7 Oct 2020 14:24:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="uVCNsg8G" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728513AbgJGOYB (ORCPT ); Wed, 7 Oct 2020 10:24:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59074 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728053AbgJGOYA (ORCPT ); Wed, 7 Oct 2020 10:24:00 -0400 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B840BC061755; Wed, 7 Oct 2020 07:24:00 -0700 (PDT) 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=iGa3fvjef5Q+s/OFumvi/FNW5w/Xq4roYcwSo3au2uk=; b=uVCNsg8Go88yugrNEjTpVn/YdV +QTa1oKDIWIzRzvCm6fBOC5DMFgOUUbZpStrEYeJc4178T8c31DlPdHLERLCjYGb0OAzSB9OWOvxb g6gyYf2H4qHhxPKbnb3O3lQ8ykPQutGI31TCPwxUazqV++GwbdtJoUBcpqT00v5y3l3ZGTtmgdyJN wYOMco1ST6wqHSnFbE7lpWRH3sHvK67flcTbVCHoOvmm1x/yyTnzAKa3hvayIP1pdnNr33bVYTJFU Ibf39fwMB89w3MKNWSOilUP6aWE7w8JHwJ/TqIS4Npw4fYlvUULjw8KY+ShonadBnbfFShFjBILs3 FsG+p5pw==; Received: from [54.239.6.187] (helo=freeip.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kQAMH-0003g0-1Q; Wed, 07 Oct 2020 14:23:57 +0000 Message-ID: <1b1fda3079627748e1f5084ddae8a686258c78d9.camel@infradead.org> Subject: Re: [PATCH 10/13] x86/irq: Limit IOAPIC and MSI domains' affinity without IR From: David Woodhouse To: Thomas Gleixner , x86@kernel.org Cc: iommu , kvm , linux-hyperv@vger.kernel.org, Paolo Bonzini Date: Wed, 07 Oct 2020 15:23:54 +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> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-x4/WWVJcTTdunN9okLGz" 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 Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org --=-x4/WWVJcTTdunN9okLGz Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2020-10-07 at 16:05 +0200, Thomas Gleixner wrote: > On Wed, Oct 07 2020 at 14:08, David Woodhouse wrote: > > On 7 October 2020 13:59:00 BST, Thomas Gleixner wr= ote: > > > On Wed, Oct 07 2020 at 08:48, David Woodhouse wrote: > > > > To fix *that* case, we really do need the whole series giving us pe= r- > > > > domain restricted affinity, and to use it for those MSIs/IOAPICs th= at > > > > the IRQ remapping doesn't cover. > > >=20 > > > Which do not exist today. > >=20 > > Sure. But at patch 10/13 into this particular patch series, it *does* > > exist. >=20 > As I told you before: Your ordering is wrong. We do not introduce bugs > first and then fix them later .... I didn't introduce that bug; it's been there for years. Fixing it properly requires per-irqdomain affinity limits. There's a cute little TODO at least in the Intel irq-remapping driver, noting that we should probably check if there are any IOAPICs that aren't in the scope of any DRHD at all. But that's all. If it happens, I think we'll end up doing the right thing and instantiating a non-IR IOAPIC domain for it, and if we *don't* have any CPU with an APIC ID above... (checks notes)... 7 ... then it'll just about work out. Over 7 and we're screwed (because logical mode; see also https://git.infradead.org/users/dwmw2/linux.git/commit/429f0c33f for a straw man but that's getting even further down the rabbit hole) --=-x4/WWVJcTTdunN9okLGz 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 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