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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 37DB5C5517A for ; Tue, 3 Nov 2020 14:35:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E0C8E2244C for ; Tue, 3 Nov 2020 14:35:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="Sqkx4sgN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728072AbgKCOfx (ORCPT ); Tue, 3 Nov 2020 09:35:53 -0500 Received: from mx2.suse.de ([195.135.220.15]:47294 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728248AbgKCOfc (ORCPT ); Tue, 3 Nov 2020 09:35:32 -0500 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=1604414129; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BoXo0vU/l+clTxUbs4bEpnnnJm2Z50z4yZ9YTr6f2A0=; b=Sqkx4sgN5a6cst54NDizeRkojESCMDDyE+cQl0pcP+t2fZTivRjlGc0NwTAvbyhNAyUUti Cux9QcpRSxExQ4nQMeu922ho99wPYXqplw+vfRlHHBFiVvz20YJLRIBd0mmeXYaFQ6fbm3 5W7YWeJgHXFkEh/BdC9FtGihZ+Qu+iI= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id AFB56B2AB for ; Tue, 3 Nov 2020 14:35:29 +0000 (UTC) From: Juergen Gross To: stable@vger.kernel.org Subject: [PATCH v2 10/13] xen/events: switch user event channels to lateeoi model Date: Tue, 3 Nov 2020 15:35:25 +0100 Message-Id: <20201103143528.22780-11-jgross@suse.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201103143528.22780-1-jgross@suse.com> References: <20201103143528.22780-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org Instead of disabling the irq when an event is received and enabling it again when handled by the user process use the lateeoi model. This is part of XSA-332. This is upstream commit c44b849cee8c3ac587da3b0980e01f77500d158c Cc: stable@vger.kernel.org Reported-by: Julien Grall Signed-off-by: Juergen Gross Tested-by: Stefano Stabellini Reviewed-by: Stefano Stabellini Reviewed-by: Jan Beulich Reviewed-by: Wei Liu --- drivers/xen/evtchn.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c index e8c7f09d01be..bcf0b1e60f2c 100644 --- a/drivers/xen/evtchn.c +++ b/drivers/xen/evtchn.c @@ -178,7 +178,6 @@ static irqreturn_t evtchn_interrupt(int irq, void *data) "Interrupt for port %d, but apparently not enabled; per-user %p\n", evtchn->port, u); - disable_irq_nosync(irq); evtchn->enabled = false; spin_lock(&u->ring_prod_lock); @@ -304,7 +303,7 @@ static ssize_t evtchn_write(struct file *file, const char __user *buf, evtchn = find_evtchn(u, port); if (evtchn && !evtchn->enabled) { evtchn->enabled = true; - enable_irq(irq_from_evtchn(port)); + xen_irq_lateeoi(irq_from_evtchn(port), 0); } } @@ -404,8 +403,8 @@ static int evtchn_bind_to_user(struct per_user_data *u, int port) if (rc < 0) goto err; - rc = bind_evtchn_to_irqhandler(port, evtchn_interrupt, 0, - u->name, evtchn); + rc = bind_evtchn_to_irqhandler_lateeoi(port, evtchn_interrupt, 0, + u->name, evtchn); if (rc < 0) goto err; -- 2.26.2