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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 Reviewed-by: Peter Xu --- 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 From nobody Wed Nov 27 17:47:51 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=1697705654; cv=none; d=zohomail.com; s=zohoarc; b=bo7YlBGYz5b4b6Lm1bpyM0RORUPrrxumx40KabwdekLp8cpRqoUCYJtYEYqZikodH7Mw5M2wWmrUeXkqzOdNUd/pDeLj4g/aWVXhKbV7WKvSvlw8P1wu5ug3GJzIRw42Y7pJTKD1lIkn+G3UsmFwpNh/IPg2R9HrYWyPNTsM4M0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1697705654; 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; 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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1697705588; 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=ByaaiDOt1HF2FQ56fR3JPzcBzLQVsrnCbWmEAaYjME8=; b=BRliWVlCcNhPyVbHcEWzbn0g5gSZDn+63xbEGFrPDfoOsXU2JkaUOeEjbDRj9Qzblj7Dq/ NWMh5ERm9LGkVdauxDOD6uyIzpcmUYpfMwjkNclLVPnHdnPWoXJFMCtg9hLNCk3a0QeBG/ MIc7oKtJZiG0AsWPHTCrHcWqI56/AfE= X-MC-Unique: XB-FbCJYPEqt_QM-oL2kAw-1 From: Juan Quintela To: qemu-devel@nongnu.org Cc: Li Zhijian , Juan Quintela , Leonardo Bras , Fabiano Rosas , Peter Xu Subject: [PATCH 2/2] migration: Rename ram_handle_compressed() to ram_handle_zero() Date: Thu, 19 Oct 2023 10:52:59 +0200 Message-ID: <20231019085259.13307-3-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=170.10.129.124; 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_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: 1697705655297100001 Content-Type: text/plain; charset="utf-8" Now that we know it only handles zero, we can remove the ch parameter. Signed-off-by: Juan Quintela Reviewed-by: Fabiano Rosas Reviewed-by: Peter Xu --- migration/ram.h | 2 +- migration/ram.c | 10 +++++----- migration/rdma.c | 2 +- 3 files changed, 7 insertions(+), 7 deletions(-) diff --git a/migration/ram.h b/migration/ram.h index 145c915ca7..3f724b2f02 100644 --- a/migration/ram.h +++ b/migration/ram.h @@ -60,7 +60,7 @@ int ram_discard_range(const char *block_name, uint64_t st= art, size_t length); int ram_postcopy_incoming_init(MigrationIncomingState *mis); int ram_load_postcopy(QEMUFile *f, int channel); =20 -void ram_handle_compressed(void *host, uint8_t ch, uint64_t size); +void ram_handle_zero(void *host, uint64_t size); =20 void ram_transferred_add(uint64_t bytes); void ram_release_page(const char *rbname, uint64_t offset); diff --git a/migration/ram.c b/migration/ram.c index 0dd8bbb339..132662818b 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -3461,7 +3461,7 @@ static inline void *colo_cache_from_block_offset(RAMB= lock *block, } =20 /** - * ram_handle_compressed: handle the zero page case + * ram_handle_zero: handle the zero page case * * If a page (or a whole RDMA chunk) has been * determined to be zero, then zap it. @@ -3470,10 +3470,10 @@ static inline void *colo_cache_from_block_offset(RA= MBlock *block, * @ch: what the page is filled from. We only support zero * @size: size of the zero page */ -void ram_handle_compressed(void *host, uint8_t ch, uint64_t size) +void ram_handle_zero(void *host, uint64_t size) { - if (ch !=3D 0 || !buffer_is_zero(host, size)) { - memset(host, ch, size); + if (!buffer_is_zero(host, size)) { + memset(host, 0, size); } } =20 @@ -4051,7 +4051,7 @@ static int ram_load_precopy(QEMUFile *f) ret =3D -EINVAL; break; } - ram_handle_compressed(host, ch, TARGET_PAGE_SIZE); + ram_handle_zero(host, TARGET_PAGE_SIZE); break; =20 case RAM_SAVE_FLAG_PAGE: diff --git a/migration/rdma.c b/migration/rdma.c index 2d963fd147..e3493e3b3e 100644 --- a/migration/rdma.c +++ b/migration/rdma.c @@ -3597,7 +3597,7 @@ int rdma_registration_handle(QEMUFile *f) comp->value); goto err; } - ram_handle_compressed(host_addr, comp->value, comp->length); + ram_handle_zero(host_addr, comp->length); break; =20 case RDMA_CONTROL_REGISTER_FINISHED: --=20 2.41.0