From nobody Wed Nov 27 20:33:54 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1697705643; cv=none; d=zohomail.com; s=zohoarc; b=bD1UL1jQUDpc0I790K3MK5Ag05jzJUMiGC3aVV8+VyaYQglEG6NLdUo71hEBi6OD5UWYGnJ0IjWr7+IwsHBG/9now6o/4KvYQIe23k2OurXq/XKBEj6gXvAi4rQrQ7QlJ9FBDvST9ltgsLw72/9p6L/haGC2k55+Pw2EDotZ/z4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1697705643; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=KJeNsiMKZaOViLZzkQUGImwu28+YIJJcGCN+fE+VaCI=; b=fVSjGryrW/1UKC6tSXFjlCAOW5sDDXUZKDRvecFyWVlIB9EuaTrVyBXjiQVXWzn1vE6Nis1lB1PnUEphCIpYqBnMR/vsrj8v9FXzKJkU/QGS/5neKwEPye+OKKktMk4YI7+4y+6krJjO9+6IaHu6TcAi0ZqT31cupIGj6OeRyC0= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1697705643718872.2386633810095; Thu, 19 Oct 2023 01:54:03 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qtOmC-0004MS-PT; Thu, 19 Oct 2023 04:53:08 -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 1qtOmB-0004ME-Rz for qemu-devel@nongnu.org; Thu, 19 Oct 2023 04:53:07 -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 1qtOmA-0001iU-D9 for qemu-devel@nongnu.org; Thu, 19 Oct 2023 04:53:07 -0400 Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-650-llupVRGTOPqXQduUh_oiQQ-1; Thu, 19 Oct 2023 04:53:03 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B5A1228237D0; Thu, 19 Oct 2023 08:53:02 +0000 (UTC) Received: from secure.mitica (unknown [10.39.194.127]) by smtp.corp.redhat.com (Postfix) with ESMTP id B1D1A10828; Thu, 19 Oct 2023 08:53:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1697705585; 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=KJeNsiMKZaOViLZzkQUGImwu28+YIJJcGCN+fE+VaCI=; b=SFkvvP0IO6CK2Nmt+aCAgk+woTXIwMtdhjDr7fJogHiCpkNvyPAjhqgZ21NlLp+ZCSlOdE HRfbaZ508dOHmoe0ENxcN48HWK4e1Go5OGZeEcMcSMno32BAGtmybVYKHG5AUOfTLZk9Sa i9n96sY/gJgatskaNRE6iCG2aW9hIXg= X-MC-Unique: llupVRGTOPqXQduUh_oiQQ-1 From: Juan Quintela To: qemu-devel@nongnu.org Cc: Li Zhijian , Juan Quintela , Leonardo Bras , Fabiano Rosas , Peter Xu Subject: [PATCH 1/2] migration: Receiving a zero page non zero is an error Date: Thu, 19 Oct 2023 10:52:58 +0200 Message-ID: <20231019085259.13307-2-quintela@redhat.com> In-Reply-To: <20231019085259.13307-1-quintela@redhat.com> References: <20231019085259.13307-1-quintela@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.5 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1697705645409100003 Content-Type: text/plain; charset="utf-8" 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 --- 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 c844151ee9..0dd8bbb339 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -3730,16 +3730,18 @@ int ram_load_postcopy(QEMUFile *f, int channel) switch (flags & ~RAM_SAVE_FLAG_CONTINUE) { case RAM_SAVE_FLAG_ZERO: ch =3D qemu_get_byte(f); + if (ch !=3D 0) { + error_report("Found a zero page with value %d", ch); + ret =3D -EINVAL; + break; + } /* * Can skip to set page_buffer when * this is a zero page and (block->page_size =3D=3D TARGET_PAG= E_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 =3D false; - } break; =20 case RAM_SAVE_FLAG_PAGE: @@ -4044,6 +4046,11 @@ static int ram_load_precopy(QEMUFile *f) =20 case RAM_SAVE_FLAG_ZERO: ch =3D qemu_get_byte(f); + if (ch !=3D 0) { + error_report("Found a zero page with value %d", ch); + ret =3D -EINVAL; + break; + } ram_handle_compressed(host, ch, TARGET_PAGE_SIZE); break; =20 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) =20 host_addr =3D 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; =20 --=20 2.41.0