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=-5.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_2 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 03758C07E98 for ; Mon, 5 Jul 2021 08:02:43 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A8508613B2 for ; Mon, 5 Jul 2021 08:02:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A8508613B2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=aepfle.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.149867.277185 (Exim 4.92) (envelope-from ) id 1m0JYp-00028T-62; Mon, 05 Jul 2021 08:02:35 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 149867.277185; Mon, 05 Jul 2021 08:02:35 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1m0JYp-00028M-2z; Mon, 05 Jul 2021 08:02:35 +0000 Received: by outflank-mailman (input) for mailman id 149867; Mon, 05 Jul 2021 08:02:33 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1m0JYn-000289-FM for xen-devel@lists.xenproject.org; Mon, 05 Jul 2021 08:02:33 +0000 Received: from mo4-p01-ob.smtp.rzone.de (unknown [81.169.146.164]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 59806caa-dd67-11eb-843e-12813bfff9fa; Mon, 05 Jul 2021 08:02:32 +0000 (UTC) Received: from sender by smtp.strato.de (RZmta 47.28.1 AUTH) with ESMTPSA id 30791cx6582UKaQ (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Mon, 5 Jul 2021 10:02:30 +0200 (CEST) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 59806caa-dd67-11eb-843e-12813bfff9fa DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1625472151; s=strato-dkim-0002; d=aepfle.de; h=References:In-Reply-To:Message-ID:Subject:Cc:To:From:Date:Cc:Date: From:Subject:Sender; bh=2a35YCiZlYF+krv9oSYPP0qwc7dNF0JWN07wu+SYq0I=; b=g81ylTiAx4n9ra+L0C5ZvJkBTOMFvEO9rnW3zkuwkFEomNx5ojU0NMnDo+dujVKQQ2 +RjH/pgf/HfxbhJKyk2N7WxY5Lx6Amk4ghWso4Rc4ACpDtRJ2zbXG0OQ1Klpd6L/Pv0I uw/UbZx9U/q10Quyml2oE18CqbHjlKSWRXYL83laaB2FnDN3cRYDouR1WgONDId6MbX1 l7+suYInxLzcfZjGbOdcRTxHvmI1/dgEx79vgmBZqfIdcxJupf+9cD38n2PPLq6R5v7h cGwXaICsKcrCLc3nIdgiJ3Fa8oT9WgnGlMqAiCHEoc0UnKclFBeiIunCqu0oY2XYN2ps e8bQ== Authentication-Results: strato.com; dkim=none X-RZG-AUTH: ":P2EQZWCpfu+qG7CngxMFH1J+3q8wa/QLpd5ylWvMDX3y/OuD5rXVisF+Ax6FOE3sSy9BcWAcR/hQoAs9MGk67vg1baqX" X-RZG-CLASS-ID: mo00 Date: Mon, 5 Jul 2021 10:02:28 +0200 From: Olaf Hering To: Jan Beulich Cc: Andrew Cooper , Ian Jackson , Wei Liu , Xen-devel Subject: Re: [PATCH] tools/libxenguest: Fix migration's debug option Message-ID: <20210705100228.4947ed4e.olaf@aepfle.de> In-Reply-To: <06968742-355f-ad37-0681-e51eea256414@suse.com> References: <20210702190342.31319-1-andrew.cooper3@citrix.com> <06968742-355f-ad37-0681-e51eea256414@suse.com> X-Mailer: Claws Mail 2021.05.27 (GTK+ 2.24.32; x86_64-suse-linux-gnu) MIME-Version: 1.0 Content-Type: multipart/signed; boundary="Sig_/bl.bklON165KmYyWfGn78yU"; protocol="application/pgp-signature"; micalg=pgp-sha256 --Sig_/bl.bklON165KmYyWfGn78yU Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Am Mon, 5 Jul 2021 09:57:21 +0200 schrieb Jan Beulich : > What is "the grant problem" referring to here? Neither anything above > nor the offending original commit has any reference to grants, or a > problem with them. When the guest is paused during final transit, the backends will continue t= o write into domU memory. As a result the final additional iteration to ver= ify memory on both sides will always see errors. The code has no way to kno= w for which pfn such mismatches in page content can safely be ignored. 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