From patchwork Tue Oct 24 13:12:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Juan Quintela X-Patchwork-Id: 13434466 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 0534FC25B48 for ; Tue, 24 Oct 2023 13:21:47 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qvHEM-00046O-1i; Tue, 24 Oct 2023 09:13:58 -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 1qvHEJ-0003xb-Rb for qemu-devel@nongnu.org; Tue, 24 Oct 2023 09:13:56 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qvHEI-000132-7z for qemu-devel@nongnu.org; Tue, 24 Oct 2023 09:13:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1698153231; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=wSytcPgXUihOAo8jO1TEKPhY/Cs4SiCxtxaCJgHSibA=; b=M65s9nvoPGicJ0G2xJj6fsCGvWKYQ8qN/ZlwqJrqUiM+iLTqlyO/VlB9gUjLbtCZ8jqZ/6 9fQ81pBR5hg6XnQdNJSVkqW7OA786r78nkSTJxlz58l6+ou3fkaZ0JguGFEraDmAH3g+Gj 0t2FeFPNGJNGieWCeb7omSDefCb/oIc= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-194-Vg8m86fZOGaYBel35wJwoA-1; Tue, 24 Oct 2023 09:13:48 -0400 X-MC-Unique: Vg8m86fZOGaYBel35wJwoA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 62EE980171C; Tue, 24 Oct 2023 13:13:47 +0000 (UTC) Received: from secure.mitica (unknown [10.39.194.127]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3798C1C060B9; Tue, 24 Oct 2023 13:13:41 +0000 (UTC) From: Juan Quintela To: qemu-devel@nongnu.org Cc: Eric Blake , Richard Henderson , Corey Minyard , Li Zhijian , Marcel Apfelbaum , Hanna Reitz , John Snow , David Gibson , Gerd Hoffmann , Stefan Hajnoczi , Halil Pasic , Peter Maydell , Corey Minyard , Mark Cave-Ayland , Kevin Wolf , qemu-s390x@nongnu.org, =?utf-8?q?C=C3=A9dric?= =?utf-8?q?_Le_Goater?= , qemu-arm@nongnu.org, libvir-list@redhat.com, Stefan Weil , Nicholas Piggin , Daniel Henrique Barboza , =?utf-8?q?Marc-Andr=C3=A9_?= =?utf-8?q?Lureau?= , Peter Xu , Leonardo Bras , Jason Wang , Fam Zheng , Christian Borntraeger , David Hildenbrand , Thomas Huth , Fabiano Rosas , Ilya Leoshkevich , Harsh Prateek Bora , Samuel Thibault , Eric Farman , Juan Quintela , Markus Armbruster , Stefan Berger , qemu-ppc@nongnu.org, "Michael S. Tsirkin" , qemu-block@nongnu.org Subject: [PULL 05/39] migration: Receiving a zero page non zero is an error Date: Tue, 24 Oct 2023 15:12:31 +0200 Message-ID: <20231024131305.87468-6-quintela@redhat.com> In-Reply-To: <20231024131305.87468-1-quintela@redhat.com> References: <20231024131305.87468-1-quintela@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.7 Received-SPF: pass client-ip=170.10.133.124; envelope-from=quintela@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, 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 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 Reviewed-by: Fabiano Rosas Reviewed-by: Peter Xu Signed-off-by: Juan Quintela Message-ID: <20231019085259.13307-2-quintela@redhat.com> --- migration/ram.c | 15 +++++++++++---- migration/rdma.c | 6 +++++- 2 files changed, 16 insertions(+), 5 deletions(-) diff --git a/migration/ram.c b/migration/ram.c index 92769902bb..4bfb20c94a 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -3715,16 +3715,18 @@ int ram_load_postcopy(QEMUFile *f, int channel) switch (flags & ~RAM_SAVE_FLAG_CONTINUE) { case RAM_SAVE_FLAG_ZERO: ch = qemu_get_byte(f); + if (ch != 0) { + error_report("Found a zero page with value %d", ch); + ret = -EINVAL; + break; + } /* * Can skip to set page_buffer when * this is a zero page and (block->page_size == TARGET_PAGE_SIZE). */ - if (ch || !matches_target_page_size) { + if (!matches_target_page_size) { memset(page_buffer, ch, TARGET_PAGE_SIZE); } - if (ch) { - tmp_page->all_zero = false; - } break; case RAM_SAVE_FLAG_PAGE: @@ -4030,6 +4032,11 @@ static int ram_load_precopy(QEMUFile *f) case RAM_SAVE_FLAG_ZERO: ch = qemu_get_byte(f); + if (ch != 0) { + error_report("Found a zero page with value %d", ch); + ret = -EINVAL; + break; + } ram_handle_compressed(host, ch, TARGET_PAGE_SIZE); break; diff --git a/migration/rdma.c b/migration/rdma.c index 2a1852ec7f..2d963fd147 100644 --- a/migration/rdma.c +++ b/migration/rdma.c @@ -3592,7 +3592,11 @@ int rdma_registration_handle(QEMUFile *f) host_addr = block->local_host_addr + (comp->offset - block->offset); - + if (comp->value) { + error_report("rdma: Zero page with non-zero (%d) value", + comp->value); + goto err; + } ram_handle_compressed(host_addr, comp->value, comp->length); break;