From patchwork Tue Nov 3 20:31:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 317239 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=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 84D3EC2D0A3 for ; Tue, 3 Nov 2020 20:37:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 51196223AB for ; Tue, 3 Nov 2020 20:37:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604435856; bh=lpBgQr9j7n6bKa74AE3ubt/kpkv/oSevDm/qOBrv0WM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=tO205WjyxLpCgHUxUNbR00xRz8Lt/FN+O+LKBWqyruiMuDepX2CEVGHLcrn4SQ3q6 P7P6d96G8BTOQhT6qHHcWO0tDwgT/JKVzxUBpHVkOW87dLXm+MORYe/SmyPhRdILat gdmGqX4XLOvtkEq8Ct32jjm2OYW96FekzqgObaYQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729715AbgKCUhd (ORCPT ); Tue, 3 Nov 2020 15:37:33 -0500 Received: from mail.kernel.org ([198.145.29.99]:47136 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729694AbgKCUhb (ORCPT ); Tue, 3 Nov 2020 15:37:31 -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 7D2462224E; Tue, 3 Nov 2020 20:37:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604435851; bh=lpBgQr9j7n6bKa74AE3ubt/kpkv/oSevDm/qOBrv0WM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hQS+z7Q9elvsfxWGG2ppSMdldvuPEShxbC1WKeeTZsu19WZm+IKyCwzJa/wthzID1 yxcFOMYkk0cmoxsCtWxoIegjOpN7MXxiqDLS1yfUBch11CgmQxWVq7+sAqsEWhk6FY GNeeJ25seEIPfj4vFYKM+w+qeGR/32k7EJ91L++I= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Julien Grall , Juergen Gross , Stefano Stabellini , Jan Beulich , Wei Liu Subject: [PATCH 5.9 010/391] xen/events: switch user event channels to lateeoi model Date: Tue, 3 Nov 2020 21:31:01 +0100 Message-Id: <20201103203348.739076704@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201103203348.153465465@linuxfoundation.org> References: <20201103203348.153465465@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@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 @@ -167,7 +167,6 @@ static irqreturn_t evtchn_interrupt(int "Interrupt for port %u, but apparently not enabled; per-user %p\n", evtchn->port, u); - disable_irq_nosync(irq); evtchn->enabled = false; spin_lock(&u->ring_prod_lock); @@ -293,7 +292,7 @@ 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); } } @@ -393,8 +392,8 @@ 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;