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 BE6A0C433DF for ; Tue, 13 Oct 2020 07:52:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2D7D6207C3 for ; Tue, 13 Oct 2020 07:52:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="P+CnQOMj" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390429AbgJMHwN (ORCPT ); Tue, 13 Oct 2020 03:52:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59198 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390384AbgJMHwN (ORCPT ); Tue, 13 Oct 2020 03:52:13 -0400 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BBD7EC0613D0; Tue, 13 Oct 2020 00:52:12 -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=uiBoiTyCTjYljnarFoxRgTgTOzIit1DOsWrzq8J/PyU=; b=P+CnQOMjRBrCowRiARgobTT3sV BD4Y+AJfDlMwa6ttHu4AjKF4tx0OJ2X2vJkfHmXolzQaUdYfW0SknkcgeQ94vidruy8f6oc7uDi8V nTTTyz4wDBOuFFoReHf+x9XN3k91i5b4/6Amq8HBHvNoYwK2FKZsGhWajmR90B9Wsp09uWh4kUH1o XEGsJV534MtMkxrYxlrekWAtfJfq20uRM/5fxJ4FihAzAd517SQT5wzs2xC4+6d+up6OSrF8c+K7A TR8Ig5e+DunQUzkrWPQyjp1K7zuSfTTCCptBZsX+rqak6Vbhcy8tMr8T+l8Nm883huwzn6HzRFs85 UB0KYbiw==; 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 1kSF6M-0004Lg-1e; Tue, 13 Oct 2020 07:52:07 +0000 Message-ID: <0de733f6384874d68afba2606119d0d9b1e8b34e.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 08:52:04 +0100 In-Reply-To: <87eem3ozxd.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> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-0BV85l6Te4RanQVP8cfA" 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-kernel@vger.kernel.org --=-0BV85l6Te4RanQVP8cfA Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2020-10-13 at 00:13 +0200, Thomas Gleixner wrote: > On Mon, Oct 12 2020 at 21:20, David Woodhouse wrote: > > On Mon, 2020-10-12 at 20:38 +0200, Thomas Gleixner wrote: > > > Nasty, but way better than what we have now.=20 > >=20 > > Want me to send that out in email or is the git tree enough for now? > >=20 > > I've cleaned it up a little and fixed a bug in the I/OAPIC error path. >=20 > Mail would be nice once you are confident with the pile. After the next cup of coffee. Will send it as an incremental series on top of my previous ext_dest_id series. > > Still not entirely convinced about the apic->apic_id_valid(32768) thing > > but it should work well enough, and doesn't require exporting any extra > > state from apic.c that way. >=20 > Yeah, that part is odd. >=20 > I really dislike the way how irq_find_matching_fwspec() works. The 'rc' > value is actually boolean despite being type 'int' and if 'rc' is not 0 > then it returns the domain even if 'rc' is an error code. >=20 > But that does not allow to return error codes from a domain match() / > select() callback which is what we really want to express that there is > something fishy. I don't know that we need to return an explicit error. I made x86_vector_select() refuse to match if IRQ remapping is enabled, which means that the irq_find_matching_fwspec() call will fail by returning NULL in precisely the cases it should. (Which should never happen; qv). That failure means HPET will refuse to set up MSI, or I/OAPIC will refuse to initialise (later causing a BUG and a failure to boot, which is probably the correct thing to do). It's all fine. + dom =3D irq_find_matching_fwspec(fwspec, DOMAIN_BUS_IR); + if (dom) + return IS_ERR(dom) ? NULL : dom; + + return x86_vector_domain; +} Ick. There's no need for that. 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. --=-0BV85l6Te4RanQVP8cfA 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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