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 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CC8B8C001DF for ; Thu, 19 Oct 2023 21:26:29 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qtaTe-0004mK-6L; Thu, 19 Oct 2023 17:22:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qtaTd-0004iC-2a for qemu-devel@nongnu.org; Thu, 19 Oct 2023 17:22:45 -0400 Received: from smtp-out1.suse.de ([195.135.220.28]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qtaTb-0000ja-A7 for qemu-devel@nongnu.org; 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bh=2XgY2qtIPGaQ3Tb4ESUDXjMMP1DLOJyp3lbqulXeqaQ=; b=uz1jm+KFe6QxSytn/fsR7YjhVRxwuWKW80qUSEFW0RtYLnvhx42vZqpxQbkW3SjbuovWXF dav1ELMzEEdO3RAQ== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id B996D139C2; Thu, 19 Oct 2023 21:22:40 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id mHj9ICCeMWX8RAAAMHmgww (envelope-from ); Thu, 19 Oct 2023 21:22:40 +0000 From: Fabiano Rosas To: Juan Quintela , qemu-devel@nongnu.org Cc: Li Zhijian , Juan Quintela , Leonardo Bras , Peter Xu Subject: Re: [PATCH 1/2] migration: Receiving a zero page non zero is an error In-Reply-To: <20231019085259.13307-2-quintela@redhat.com> References: <20231019085259.13307-1-quintela@redhat.com> <20231019085259.13307-2-quintela@redhat.com> Date: Thu, 19 Oct 2023 18:22:38 -0300 Message-ID: <8734y6i9y9.fsf@suse.de> MIME-Version: 1.0 Content-Type: text/plain Authentication-Results: smtp-out1.suse.de; none X-Spamd-Result: default: False [-7.07 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; BAYES_HAM(-2.97)[99.88%]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-3.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; RCPT_COUNT_FIVE(0.00)[6]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; MID_RHS_MATCH_FROM(0.00)[] Received-SPF: pass client-ip=195.135.220.28; envelope-from=farosas@suse.de; helo=smtp-out1.suse.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Juan Quintela writes: > We don't allow non zero compressed pages since: > > commit 3edcd7e6ebae3ef0ac178eed5f4225803159562d > Author: Peter Lieven > Date: Tue Mar 26 10:58:35 2013 +0100 > > migration: search for zero instead of dup pages > > RDMA case is a bit more complicated, but they don't handle it since: > > commit a1febc4950f2c6232c002f401d7cd409f6fa6a88 > Author: Richard Henderson > Date: Mon Aug 29 11:46:14 2016 -0700 > > cutils: Export only buffer_is_zero > > Signed-off-by: Juan Quintela Reviewed-by: Fabiano Rosas