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 0143DC4742C for ; Tue, 3 Nov 2020 22:10:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A968C21556 for ; Tue, 3 Nov 2020 22:10:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604441433; bh=lpBgQr9j7n6bKa74AE3ubt/kpkv/oSevDm/qOBrv0WM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=tYKeyhffZQY2fXALftSBrzLCJjNzIF6jcMaGY1HwLP8iEoPgnoFfi36H/App1mgWt k5XBQEpUjXXAmfgtm7b5zE6WJuPWICp5lXPe0XpwwUK0a7jBkb6FlPGAZ8soB8zGfT Oxpmop+sjlgAlbwKDKLY44Lq/fBT3ALEMCLJRkS8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729771AbgKCUhh (ORCPT ); Tue, 3 Nov 2020 15:37:37 -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 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 @@ -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;