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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,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 8C3C9C43143 for ; Mon, 1 Oct 2018 07:16:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 531382089D for ; Mon, 1 Oct 2018 07:16:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 531382089D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728853AbeJANxN (ORCPT ); Mon, 1 Oct 2018 09:53:13 -0400 Received: from mx2.suse.de ([195.135.220.15]:56348 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728747AbeJANxN (ORCPT ); Mon, 1 Oct 2018 09:53:13 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id ACB02ADCE; Mon, 1 Oct 2018 07:16:53 +0000 (UTC) From: Juergen Gross To: linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org Cc: boris.ostrovsky@oracle.com, hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, Juergen Gross , Waiman.Long@hp.com, peterz@infradead.org Subject: [PATCH 0/2] xen: fix two issues in Xen pv qspinlock handling Date: Mon, 1 Oct 2018 09:16:39 +0200 Message-Id: <20181001071641.19282-1-jgross@suse.com> X-Mailer: git-send-email 2.16.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The Xen specific queue spinlock wait function has two issues which could result in a hanging system. They have a similar root cause of clearing a pending wakeup of a waiting vcpu and later going to sleep waiting for the just cleared wakeup event, which of course won't ever happen. Juergen Gross (2): xen: fix race in xen_qlock_wait() xen: make xen_qlock_wait() nestable arch/x86/xen/spinlock.c | 33 ++++++++++++--------------------- 1 file changed, 12 insertions(+), 21 deletions(-) Cc: Waiman.Long@hp.com Cc: peterz@infradead.org -- 2.16.4