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 E4508C43457 for ; Tue, 13 Oct 2020 10:53:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 83309214DB for ; Tue, 13 Oct 2020 10:53:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="zEA5ILd4" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387607AbgJMKxK (ORCPT ); Tue, 13 Oct 2020 06:53:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59100 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728135AbgJMKxK (ORCPT ); Tue, 13 Oct 2020 06:53:10 -0400 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0681AC0613D0; Tue, 13 Oct 2020 03:53:10 -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=xbqXxjgoiIpNrneJWINZPll5ODEj733BvwKW7utVQU0=; b=zEA5ILd4k91AXHz4ccw2wNCQfR RvFpgM7idcH/CKP0LERnBnxnZw7kjKF4y+HDDwhwJFMLer7jIweZmRbLlNrsaksnsNqy56vnIp+vT 6W/0I2vEQ1gmNtVwWZBtsfWKenyQhcx1NjFXvDy+ZRsIw/3vE9VdcF6uvUOB7INLGMQc3+s5u4l6p FcFqfg9e5oVByT5bUipU3yblYusm+7AYaeOVXXETpKlvqtOVJHJoQNGIwl9tv6KX4ShxMDunHVQNM qUVnP7oQe7ixfDVAwwD6Pu5OOhPzD+5rx+nQiPfxzmqCI49CS2WxJiL3Cy/KTH8rW/4afQ3opZfPg H+QXWJUw==; 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 1kSHvW-000762-KV; Tue, 13 Oct 2020 10:53:06 +0000 Message-ID: <832c2d4c11cd99382782474f51d15889ffa24407.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 11:53:04 +0100 In-Reply-To: <87wnzuo127.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> <87wnzuo127.fsf@nanos.tec.linutronix.de> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-H+N0izcHS7o738vALDT4" 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 --=-H+N0izcHS7o738vALDT4 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2020-10-13 at 12:46 +0200, Thomas Gleixner wrote: > And after becoming more awake, that wont work anyway because there is > more than one IR domain, so there is no way to return an error "You > forgot to register" obviously. >=20 > But the APIC id (32768) valid check is also broken because IR can be > enabled even without X2APIC. Nope, it's perfectly OK to allow HPET and I/OAPIC to be parented in the x86_vector_domain in that case, regardless of IR. The *actual* criterion for x86_vector_select() returning zero to say=20 "don't use me" is "could there be CPUs in the system which can't be reached through x86_vector_msi_compose_msg()?". It's not really about IR at all. The apic_id_valid(32768) check is checking precisely the right thing. --=-H+N0izcHS7o738vALDT4 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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