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=-8.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 003B9C4363A for ; Thu, 8 Oct 2020 13:00:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 86320207DE for ; Thu, 8 Oct 2020 13:00:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="PwTZFfmJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730205AbgJHNA4 (ORCPT ); Thu, 8 Oct 2020 09:00:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42956 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729986AbgJHNAz (ORCPT ); Thu, 8 Oct 2020 09:00:55 -0400 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4FD9DC061755; Thu, 8 Oct 2020 06:00:55 -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=ogLTQUVw7RQ0SMq88BDwOj5osDnJSkZ9cgiGR6v2BYU=; b=PwTZFfmJ6c4MmnWKrl6n6YjlC2 oBGoxTP9T/JpX2sqOtFIXX2MRd/n2JdX3wDobhwlIshC5GJAusEJ+opHifxo20h92ARH8eVEwiklm YT65Y0KVRSyZWwFT8J2S8zeAuInfi+r0iu3nh8cxg8usm8r8qUOmHvurUvNsp8B1KalnIVQAmHM4J GzsC5hImN+DKARu8VUGy39YfnlhmTCym81C+e7Et2pGj8QVrdoKwasjha+f86Dfd2e9CCuBauWFVV 5X1mg1AJPkPs/39+KhZlV/ByANq14DZjA2Fbc0rAz3aBrjiL6jzf0fZu4y2DqQm7sRutdqaxT79ak qFaf61QA==; Received: from [54.239.6.190] (helo=freeip.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kQVXP-0006w8-He; Thu, 08 Oct 2020 13:00:51 +0000 Message-ID: <83b53bc01a8ac72b4fd6e050bb97a2ef97090c5f.camel@infradead.org> Subject: Re: [PATCH 4/5] x86/apic: Support 15 bits of APIC ID in IOAPIC/MSI where available From: David Woodhouse To: Thomas Gleixner , x86@kernel.org Cc: kvm , Paolo Bonzini , linux-kernel Date: Thu, 08 Oct 2020 14:00:49 +0100 In-Reply-To: <87h7r5vsog.fsf@nanos.tec.linutronix.de> References: <803bb6b2212e65c568c84ff6882c2aa8a0ee03d5.camel@infradead.org> <20201007122046.1113577-1-dwmw2@infradead.org> <20201007122046.1113577-4-dwmw2@infradead.org> <87h7r5vsog.fsf@nanos.tec.linutronix.de> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-Y7B0799qZx7FNIGn7I7d" 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 --=-Y7B0799qZx7FNIGn7I7d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2020-10-08 at 13:54 +0200, Thomas Gleixner wrote: > On Wed, Oct 07 2020 at 13:20, David Woodhouse wrote: > > =20 > > + /* > > + * If the hypervisor supports extended destination ID in IOAPIC > > + * and MSI, that increases the maximum APIC ID that can be used > > + * for non-remapped IRQ domains. > > + */ > > + if (x86_init.hyper.msi_ext_dest_id()) { > > + msi_ext_dest_id =3D 1; > > + apic_limit =3D 32767; > > + } >=20 > This needs to be outside of the remap mode check because? Once upon a time, there was a later patch in the series which *also* used the apic_limit variable to generate a maximum affinity mask. Now we've ditched that idea, I can put this back inside the remap mode check. >=20 > > + > > if (remap_mode !=3D IRQ_REMAP_X2APIC_MODE) { > > /* > > * Using X2APIC without IR is not architecturally supported > > @@ -1856,9 +1868,10 @@ static __init void try_to_enable_x2apic(int rema= p_mode) > > * in physical mode, and CPUs with an APIC ID that cannnot > > * be addressed must not be brought online. > > */ > > - x2apic_set_max_apicid(255); > > + x2apic_set_max_apicid(apic_limit); > > x2apic_phys =3D 1; > > } > > + > > x2apic_enable(); > > } > > =20 > > diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c > > index 2825e003259c..85206f971284 100644 > > --- a/arch/x86/kernel/apic/msi.c > > +++ b/arch/x86/kernel/apic/msi.c > > @@ -23,8 +23,11 @@ > > =20 > > struct irq_domain *x86_pci_msi_default_domain __ro_after_init; > > =20 > > +int msi_ext_dest_id __ro_after_init; >=20 > bool please. >=20 > Aside of that this breaks the build for a kernel with CONFIG_PCI_MSI=3Dn Will 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