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bh=wSytcPgXUihOAo8jO1TEKPhY/Cs4SiCxtxaCJgHSibA=; b=iamWVlqqoLfCse/IoWTW9CBWC6vf8e2sm+QmbPfiFeZbHZGEXqZdCTMVUIQSosg7lcbweQ Zyte5azMCqPvZ0lxmzuc2x00E8GJKtRwX7osHYOCqIZWE5wy1iB/p3M3iYEcwLhdIPUhza RxQc6D7ZbNOUMTbUIhD7NG24XZ9mwog= X-MC-Unique: INxsbuvsNhae8lCVBAtL9w-1 From: Juan Quintela To: qemu-devel@nongnu.org Cc: Kevin Wolf , libvir-list@redhat.com, Stefan Hajnoczi , Fam Zheng , Hanna Reitz , Li Zhijian , Peter Xu , Leonardo Bras , Juan Quintela , Eric Blake , Markus Armbruster , Hailiang Zhang , qemu-block@nongnu.org, Fabiano Rosas Subject: [PULL 05/38] migration: Receiving a zero page non zero is an error Date: Tue, 31 Oct 2023 10:01:09 +0100 Message-ID: <20231031090142.13122-6-quintela@redhat.com> In-Reply-To: <20231031090142.13122-1-quintela@redhat.com> References: <20231031090142.13122-1-quintela@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.7 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=170.10.129.124; envelope-from=quintela@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.483, 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_H4=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: 1698743010577100003 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 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 =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: @@ -4030,6 +4032,11 @@ 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