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=-5.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 74C83C433FE for ; Fri, 11 Dec 2020 12:10:50 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2C8782246B for ; Fri, 11 Dec 2020 12:10:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2C8782246B Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 512396EDBC; Fri, 11 Dec 2020 12:10:49 +0000 (UTC) Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id E5C806EDBC; Fri, 11 Dec 2020 12:10:47 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1607688646; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=aJZQMJEqjqCeKHnTDA0IPhE5vARBQoDmh6z4taBza3s=; b=P1ENv6ghYnMSOzdKwSZDHOniw7i+gHM9SWvjsPS+nXcpf4uhfjZJjCfiznixdHS7UHUGUl a34b0cvwxyIOGXHl1JLWLzB64bZDoXsOpneHkxjbVOOIAwHRwzjzh7nkMxX9MEEiCvDvNr htx20xTSyXpVilz7Cd7mz1QsfdAQFf8= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 41E96AE87; Fri, 11 Dec 2020 12:10:46 +0000 (UTC) Subject: Re: [patch 27/30] xen/events: Only force affinity mask for percpu interrupts To: boris.ostrovsky@oracle.com, Thomas Gleixner , LKML References: <20201210192536.118432146@linutronix.de> <20201210194045.250321315@linutronix.de> <7f7af60f-567f-cdef-f8db-8062a44758ce@oracle.com> From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Message-ID: <2164a0ce-0e0d-c7dc-ac97-87c8f384ad82@suse.com> Date: Fri, 11 Dec 2020 13:10:43 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0 MIME-Version: 1.0 In-Reply-To: <7f7af60f-567f-cdef-f8db-8062a44758ce@oracle.com> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Karthikeyan Mitran , Peter Zijlstra , Catalin Marinas , dri-devel@lists.freedesktop.org, Chris Wilson , "James E.J. Bottomley" , Saeed Mahameed , netdev@vger.kernel.org, Jakub Kicinski , Will Deacon , Michal Simek , linux-s390@vger.kernel.org, afzal mohammed , Stefano Stabellini , Dave Jiang , Leon Romanovsky , linux-rdma@vger.kernel.org, Marc Zyngier , Helge Deller , Russell King , Christian Borntraeger , linux-pci@vger.kernel.org, xen-devel@lists.xenproject.org, Heiko Carstens , Wambui Karuga , Allen Hubbe , David Airlie , linux-gpio@vger.kernel.org, Lorenzo Pieralisi , Rodrigo Vivi , Bjorn Helgaas , Lee Jones , linux-arm-kernel@lists.infradead.org, Tvrtko Ursulin , linux-parisc@vger.kernel.org, Pankaj Bharadiya , Hou Zhiqiang , Tariq Toukan , Jon Mason , linux-ntb@googlegroups.com, intel-gfx@lists.freedesktop.org, "David S. Miller" Content-Type: multipart/mixed; boundary="===============0394476437==" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --===============0394476437== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="qMVMfsvlAyIOVuhurM0AhbsuX1abhQOZS" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --qMVMfsvlAyIOVuhurM0AhbsuX1abhQOZS Content-Type: multipart/mixed; boundary="1SKmisPo0wwQx0jet3HDKXRMk6SQ4aMth"; protected-headers="v1" From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= To: boris.ostrovsky@oracle.com, Thomas Gleixner , LKML Cc: Peter Zijlstra , Marc Zyngier , Stefano Stabellini , xen-devel@lists.xenproject.org, "James E.J. Bottomley" , Helge Deller , afzal mohammed , linux-parisc@vger.kernel.org, Russell King , linux-arm-kernel@lists.infradead.org, Mark Rutland , Catalin Marinas , Will Deacon , Christian Borntraeger , Heiko Carstens , linux-s390@vger.kernel.org, Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , David Airlie , Daniel Vetter , Pankaj Bharadiya , Chris Wilson , Wambui Karuga , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Tvrtko Ursulin , Linus Walleij , linux-gpio@vger.kernel.org, Lee Jones , Jon Mason , Dave Jiang , Allen Hubbe , linux-ntb@googlegroups.com, Lorenzo Pieralisi , Rob Herring , Bjorn Helgaas , Michal Simek , linux-pci@vger.kernel.org, Karthikeyan Mitran , Hou Zhiqiang , Tariq Toukan , "David S. Miller" , Jakub Kicinski , netdev@vger.kernel.org, linux-rdma@vger.kernel.org, Saeed Mahameed , Leon Romanovsky Message-ID: <2164a0ce-0e0d-c7dc-ac97-87c8f384ad82@suse.com> Subject: Re: [patch 27/30] xen/events: Only force affinity mask for percpu interrupts References: <20201210192536.118432146@linutronix.de> <20201210194045.250321315@linutronix.de> <7f7af60f-567f-cdef-f8db-8062a44758ce@oracle.com> In-Reply-To: <7f7af60f-567f-cdef-f8db-8062a44758ce@oracle.com> --1SKmisPo0wwQx0jet3HDKXRMk6SQ4aMth Content-Type: multipart/mixed; boundary="------------8ECAEB8E864B85BAB060713C" Content-Language: en-US This is a multi-part message in MIME format. --------------8ECAEB8E864B85BAB060713C Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 11.12.20 00:20, boris.ostrovsky@oracle.com wrote: >=20 > On 12/10/20 2:26 PM, Thomas Gleixner wrote: >> All event channel setups bind the interrupt on CPU0 or the target CPU = for >> percpu interrupts and overwrite the affinity mask with the correspondi= ng >> cpumask. That does not make sense. >> >> The XEN implementation of irqchip::irq_set_affinity() already picks a >> single target CPU out of the affinity mask and the actual target is st= ored >> in the effective CPU mask, so destroying the user chosen affinity mask= >> which might contain more than one CPU is wrong. >> >> Change the implementation so that the channel is bound to CPU0 at the = XEN >> level and leave the affinity mask alone. At startup of the interrupt >> affinity will be assigned out of the affinity mask and the XEN binding= will >> be updated. >=20 >=20 > If that's the case then I wonder whether we need this call at all and i= nstead bind at startup time. After some discussion with Thomas on IRC and xen-devel archaeology the result is: this will be needed especially for systems running on a single vcpu (e.g. small guests), as the .irq_set_affinity() callback won't be called in this case when starting the irq. 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