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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 A2171C433DF for ; Thu, 28 May 2020 20:43:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8D864208A7 for ; Thu, 28 May 2020 20:43:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2407341AbgE1UnM (ORCPT ); Thu, 28 May 2020 16:43:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44028 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2407321AbgE1UnJ (ORCPT ); Thu, 28 May 2020 16:43:09 -0400 Received: from Galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F0460C08C5C6; Thu, 28 May 2020 13:43:08 -0700 (PDT) Received: from p5de0bf0b.dip0.t-ipconnect.de ([93.224.191.11] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1jePMl-00009i-6f; Thu, 28 May 2020 22:43:03 +0200 Received: by nanos.tec.linutronix.de (Postfix, from userid 1000) id A0D11100D01; Thu, 28 May 2020 22:43:02 +0200 (CEST) From: Thomas Gleixner To: Miklos Szeredi Cc: kvm@vger.kernel.org, Paolo Bonzini , Vincenzo Frascino , Juergen Gross , linux-kernel@vger.kernel.org Subject: Re: system time goes weird in kvm guest after host suspend/resume In-Reply-To: References: Date: Thu, 28 May 2020 22:43:02 +0200 Message-ID: <875zcfoko9.fsf@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Miklos Szeredi writes: > Bisected it to: > > b95a8a27c300 ("x86/vdso: Use generic VDSO clock mode storage") > > The effect observed is that after the host is resumed, the clock in > the guest is somewhat in the future and is stopped. I.e. repeated > date(1) invocations show the same time. TBH, the bisect does not make any sense at all. It's renaming the constants and moving the storage space and I just read it line for line again that the result is equivalent. I'll have a look once the merge window dust settles a bit. Thanks, tglx