From nobody Mon Feb 9 16:02:56 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=quarantine dis=none) header.from=suse.com ARC-Seal: i=1; a=rsa-sha256; t=1612608618; cv=none; d=zohomail.com; s=zohoarc; b=RJmzV4A9gJxq44yVRW01lWXjEuPMPuUfOrCiDhtbnkyN+q0jinTbCb7iEKD+86JA7SYhH30WSOYUOmC/DnYF+HJ6pnIgHFlgAHE+wp5EG6ijxn2kX17mXdRSYhPRz75wVsEpdKBfBVMK9gNiBSkVDXT031Gfx/yDC+PrjQhaUHU= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1612608618; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=TI/KsWCKGxrmPABhxI8VTW9N3/J68xoTHMjTIJFsX+o=; b=n085/4cyIBRuHQCwtH/ByaYlbG9AaO2uaQ0o2bC3UWQ4Kr6yXzaKTBvY1ByO9+sKDCjk0TMmlPiSyKYp7F3GdNakxwT8R6WLvEzmn/uYZ0ejCQK8kp8MPWEBdSH3QBIXJNiFdSLtp8xfsfX4e9z1pnfrVp/cbXnG9FH0czWI0fk= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=quarantine dis=none) header.from= Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1612608618292230.25515359374185; Sat, 6 Feb 2021 02:50:18 -0800 (PST) Received: from list by lists.xenproject.org with outflank-mailman.82120.151768 (Exim 4.92) (envelope-from ) id 1l8L9x-0005Vk-Mv; Sat, 06 Feb 2021 10:49:49 +0000 Received: by outflank-mailman (output) from mailman id 82120.151768; Sat, 06 Feb 2021 10:49:49 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l8L9x-0005Vd-JO; Sat, 06 Feb 2021 10:49:49 +0000 Received: by outflank-mailman (input) for mailman id 82120; Sat, 06 Feb 2021 10:49:48 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l8L9w-0005VY-Of for xen-devel@lists.xenproject.org; Sat, 06 Feb 2021 10:49:48 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 2769dbec-4bb6-4c28-870b-700ba0aab103; Sat, 06 Feb 2021 10:49:47 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id B8C33AC43; Sat, 6 Feb 2021 10:49:46 +0000 (UTC) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 2769dbec-4bb6-4c28-870b-700ba0aab103 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=1612608586; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TI/KsWCKGxrmPABhxI8VTW9N3/J68xoTHMjTIJFsX+o=; b=tDYiLQHQ2Y3VHKT6bGCTthGsTkWsSP79d3wVp5yBPPuyeVHOi0AtUJVqbLwz1XXqsFNptC QG67jJ0rLSBrGdI/inYBfrWSl8RL6fq4NHsMgaa+tnF5n4VCoJqieLOjwsjXVUNIWTcS/w ZljrX2l+lSX/iIl9WKpsEVz8MKCRhs0= From: Juergen Gross To: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org Cc: Juergen Gross , Boris Ostrovsky , Stefano Stabellini , stable@vger.kernel.org, Julien Grall Subject: [PATCH 1/7] xen/events: reset affinity of 2-level event initially Date: Sat, 6 Feb 2021 11:49:26 +0100 Message-Id: <20210206104932.29064-2-jgross@suse.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210206104932.29064-1-jgross@suse.com> References: <20210206104932.29064-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) Content-Type: text/plain; charset="utf-8" When creating a new event channel with 2-level events the affinity needs to be reset initially in order to avoid using an old affinity from earlier usage of the event channel port. The same applies to the affinity when onlining a vcpu: all old affinity settings for this vcpu must be reset. As percpu events get initialized before the percpu event channel hook is called, resetting of the affinities happens after offlining a vcpu (this is working, as initial percpu memory is zeroed out). Cc: stable@vger.kernel.org Reported-by: Julien Grall Signed-off-by: Juergen Gross --- drivers/xen/events/events_2l.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/xen/events/events_2l.c b/drivers/xen/events/events_2l.c index da87f3a1e351..23217940144a 100644 --- a/drivers/xen/events/events_2l.c +++ b/drivers/xen/events/events_2l.c @@ -47,6 +47,16 @@ static unsigned evtchn_2l_max_channels(void) return EVTCHN_2L_NR_CHANNELS; } =20 +static int evtchn_2l_setup(evtchn_port_t evtchn) +{ + unsigned int cpu; + + for_each_online_cpu(cpu) + clear_bit(evtchn, BM(per_cpu(cpu_evtchn_mask, cpu))); + + return 0; +} + static void evtchn_2l_bind_to_cpu(evtchn_port_t evtchn, unsigned int cpu, unsigned int old_cpu) { @@ -355,9 +365,18 @@ static void evtchn_2l_resume(void) EVTCHN_2L_NR_CHANNELS/BITS_PER_EVTCHN_WORD); } =20 +static int evtchn_2l_percpu_deinit(unsigned int cpu) +{ + memset(per_cpu(cpu_evtchn_mask, cpu), 0, sizeof(xen_ulong_t) * + EVTCHN_2L_NR_CHANNELS/BITS_PER_EVTCHN_WORD); + + return 0; +} + static const struct evtchn_ops evtchn_ops_2l =3D { .max_channels =3D evtchn_2l_max_channels, .nr_channels =3D evtchn_2l_max_channels, + .setup =3D evtchn_2l_setup, .bind_to_cpu =3D evtchn_2l_bind_to_cpu, .clear_pending =3D evtchn_2l_clear_pending, .set_pending =3D evtchn_2l_set_pending, @@ -367,6 +386,7 @@ static const struct evtchn_ops evtchn_ops_2l =3D { .unmask =3D evtchn_2l_unmask, .handle_events =3D evtchn_2l_handle_events, .resume =3D evtchn_2l_resume, + .percpu_deinit =3D evtchn_2l_percpu_deinit, }; =20 void __init xen_evtchn_2l_init(void) --=20 2.26.2