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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 F3787C2D0E4 for ; Tue, 17 Nov 2020 13:13:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A5409221EB for ; Tue, 17 Nov 2020 13:13:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="ZDZOI+oN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728790AbgKQNM5 (ORCPT ); Tue, 17 Nov 2020 08:12:57 -0500 Received: from mail.kernel.org ([198.145.29.99]:42984 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729893AbgKQNMw (ORCPT ); Tue, 17 Nov 2020 08:12:52 -0500 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 72D4F246BE; Tue, 17 Nov 2020 13:12:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1605618772; bh=FcZ5WGGba1bHQqyMiNMd30HZyzt/7UtXhMCQoxXH+pQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZDZOI+oNBrREs0LFzejpz3nQlexUR1pWrn3yLzzORFVqUinzn7y2ZjCO7bzy3U6me 6keTfJl3200sypCqISeIuBxYNdjeEaxKSL6EXKOX4ogsBKDbIRz/s4NIzf8h/BychB //4wxNmOm7zmwtUFJpRM4rKYHf+S8ADBobMmIAwk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , Julien Grall , Juergen Gross , Stefano Stabellini , Jan Beulich , Wei Liu Subject: [PATCH 4.9 70/78] xen/events: switch user event channels to lateeoi model Date: Tue, 17 Nov 2020 14:05:36 +0100 Message-Id: <20201117122112.526948785@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201117122109.116890262@linuxfoundation.org> References: <20201117122109.116890262@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Juergen Gross commit c44b849cee8c3ac587da3b0980e01f77500d158c upstream. 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. 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 Signed-off-by: Greg Kroah-Hartman --- drivers/xen/evtchn.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) --- a/drivers/xen/evtchn.c +++ b/drivers/xen/evtchn.c @@ -178,7 +178,6 @@ static irqreturn_t evtchn_interrupt(int "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 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 pe 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;