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=-5.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,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 6C8FEC43467 for ; Tue, 13 Oct 2020 10:16:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D8D5B20708 for ; Tue, 13 Oct 2020 10:16:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="rm2zBx8b" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729406AbgJMKQK (ORCPT ); Tue, 13 Oct 2020 06:16:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53326 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726935AbgJMKQJ (ORCPT ); Tue, 13 Oct 2020 06:16:09 -0400 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 860FEC0613D0; Tue, 13 Oct 2020 03:16:05 -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=5Er//8ohC9wYbLX9QACaAMI63gHl/CEo7kNgSZrS2os=; b=rm2zBx8bNLiQnUwh36FPE+hO8+ /w9lmvWhzi2315H+dNyhd0bV1IyvnnnDHvOhN6gvZkK2vcxrXepWmDACsQqs5WtKeDM4R3CTPNN18 n5KQv75XsJRvJHsPGQc4xjr2KRWsiUTJ3tbwb1YyLQhQm2gBGjoF15oaRaUU42DpV8o8ahhgekGFD isOSixnE8MtcI2vafmR9yBnbH5TacB3Cs6xPM0MfRnLH7VeIou9FWX1apEd+MgnV+BJmkEILzc7Kn ipoh72dX3XWVBtcomzGHeBIIMyMI3uV8/g8r+l3Rq68+SMD/hRUCA3sAclrOdmldcmCfDsECoQ4YM pG7Nz1ZA==; Received: from 54-240-197-239.amazon.com ([54.240.197.239] helo=u3832b3a9db3152.ant.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kSHLd-0000ba-Vu; Tue, 13 Oct 2020 10:16:02 +0000 Message-ID: <1d213d46b9f94ba9e14876eb08da995ca6ddeffb.camel@infradead.org> Subject: Re: [PATCH 5/5] x86/kvm: Add KVM_FEATURE_MSI_EXT_DEST_ID From: David Woodhouse To: Thomas Gleixner , x86@kernel.org, Marc Zyngier Cc: kvm , Paolo Bonzini , linux-kernel Date: Tue, 13 Oct 2020 11:15:59 +0100 In-Reply-To: <87zh4qo4o5.fsf@nanos.tec.linutronix.de> References: <803bb6b2212e65c568c84ff6882c2aa8a0ee03d5.camel@infradead.org> <20201007122046.1113577-1-dwmw2@infradead.org> <20201007122046.1113577-5-dwmw2@infradead.org> <87blhcx6qz.fsf@nanos.tec.linutronix.de> <95625dfce360756b99641c31212634c1bf80a69a.camel@infradead.org> <87362owhcb.fsf@nanos.tec.linutronix.de> <87tuv4uwmt.fsf@nanos.tec.linutronix.de> <958f0d5c9844f94f2ce47a762c5453329b9e737e.camel@infradead.org> <874kn2s3ud.fsf@nanos.tec.linutronix.de> <0E51DAB1-5973-4226-B127-65D77DC46CB5@infradead.org> <87pn5or8k7.fsf@nanos.tec.linutronix.de> <87ft6jrdpk.fsf@nanos.tec.linutronix.de> <25c54f8e5da1fd5cf3b01ad2fdc1640c5d86baa1.camel@infradead.org> <87362jqoh3.fsf@nanos.tec.linutronix.de> <1abc2a34c894c32eb474a868671577f6991579df.camel@infradead.org> <87eem3ozxd.fsf@nanos.tec.linutronix.de> <0de733f6384874d68afba2606119d0d9b1e8b34e.camel@infradead.org> <87zh4qo4o5.fsf@nanos.tec.linutronix.de> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-0Ie2CDTRpzf+UVyr1cMu" 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: kvm@vger.kernel.org --=-0Ie2CDTRpzf+UVyr1cMu Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2020-10-13 at 11:28 +0200, Thomas Gleixner wrote: > On Tue, Oct 13 2020 at 08:52, David Woodhouse wrote: > > On Tue, 2020-10-13 at 00:13 +0200, Thomas Gleixner wrote: > > + dom =3D irq_find_matching_fwspec(fwspec, DOMAIN_BUS_IR); > > + if (dom) > > + return IS_ERR(dom) ? NULL : dom; > > + > > + return x86_vector_domain; > > +} > >=20 > > Ick. There's no need for that. > >=20 > > Eliminating that awful "if not found then slip the x86_vector_domain in > > as a special case" was the whole *point* of using > > irq_find_matching_fwspec() in the first place. >=20 > The point was to get rid of irq_remapping_get_irq_domain(). My reason for doing it was to get rid of irq_remapping_get_irq_domain() *because* I hated the special-casing and magical slipping in of x86_vector_domain when it returned NULL. > And TBH, >=20 > if (apicid_valid(32768)) >=20 > is just another way to slip the vector domain in. It's just differently > awful. For me, that's very much not just "slipping the vector domain in". That's the vector domain returning true in its *own* ->select() function, in the circumstances where it wants to be used. The key difference is that nobody needs an external magic pointer to the x86_vector_domain. In a true irqdomain hierarchy system, shouldn't we be trying to eliminate *all* those magic pointers to specific domains, if we can? And sure, the apicid_valid(32768) as a proxy for irq_remapping_enabled is a bit of an ugly trick. I suppose we can explicitly expose irq_remapping_enabled from drivers/iommu if we wanted to. > Having an explicit answer from the search for IR: >=20 > - Here is the domain > - Your device is not registered properly > - IR not enabled or not supported >=20 > is way more obvious than the above disguised is_remapping_enabled() > check. I just don't even like thinking of it as a 'search for IR'. HPET shouldn't be caring about IR any more than PCI devices do. It just wants its parent irqdomain, that's all. For I/OAPIC there's the slight complexity that it does actually ack level-triggered interrupts differently when it's behind IR. But I don't think we need a whole separate irq_chip for that; surely it could be handled internally in ioapic_ack_level() ?=20 Either way, even with that slight hack it's nicer to think of mp_irqdomain_create() just wanting to find its parent domain, without any special knowledge of IR and falling back to x86_parent_domain. 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