From patchwork Fri May 13 06:28:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Leonardo Bras X-Patchwork-Id: 12848420 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 E52B3C433FE for ; Fri, 13 May 2022 07:00:27 +0000 (UTC) Received: from localhost ([::1]:53398 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1npPHm-0001AO-Fj for qemu-devel@archiver.kernel.org; Fri, 13 May 2022 03:00:26 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43120) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1npOno-0007R5-Rg for qemu-devel@nongnu.org; Fri, 13 May 2022 02:29:29 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:30780) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1npOnm-0000ZU-MM for qemu-devel@nongnu.org; Fri, 13 May 2022 02:29:28 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1652423365; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=kK74bLmPjFGLG0kt8kzRmoqFJAHDvB5cYkKxXSWbg1U=; b=PnoQxcGQTUpkm7nQwZtr9NpnCcDUM1CM+fZV4WDIQTbY9gOPefXm7CRQ0m2i2t/kKGCUJR ml5iV39fdJT9LFNY9zm6Rirue9/VkNGD63adJyNvS17J21itf3hTu/54V9MqLuf0cATWIs IWVZOKCis2HvPDW/Lvf1G29eHJFiaEc= Received: from mail-oa1-f69.google.com (mail-oa1-f69.google.com [209.85.160.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-252-qdP3JjiLOCqOkqP0oygZxw-1; Fri, 13 May 2022 02:29:24 -0400 X-MC-Unique: qdP3JjiLOCqOkqP0oygZxw-1 Received: by mail-oa1-f69.google.com with SMTP id 586e51a60fabf-e653506dd0so4418543fac.14 for ; Thu, 12 May 2022 23:29:24 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=kK74bLmPjFGLG0kt8kzRmoqFJAHDvB5cYkKxXSWbg1U=; b=a/HQrnzwd5qpvGcd6ZRB+AfQzWsoSECChEm9gW8kJTj7mUYINuGN8Zijt+85HZnsJX MZ1lp8I9hPQQboJPjdaDs37XEvLfFXe3JZgW0WarMosAtUq9XC9nI+fVo6aJ5aNbAK1b QXebYYHl3ZzOi0fUqdwp5VTY7bdBmWFlWbjoDxTw7GGiPOImJ2tOzPjZljCiNyqULBM5 O/c16bwI7qRm3naoUO6gY1on9ngLa7rlS00yLlzcmSWMVWPBGYAgZ1ih2CYP50iAhR0t YFzUvgqsRJVH5rQchYc8KCTp52IDQam/wTrTwvDnj6CEPI0vC1RBEEP25miPc8GZomFP dWIA== X-Gm-Message-State: AOAM531AsZJ354T+j0bo12QeSuvLJ1naZ7004D1tQMiXBB6CBNhZrzNs 7vWqBAQDSmBMHeknX9VPnLis5LGZ7NacSZtDksw5WFJA0qXbvTj9w2D1OL+sSP9ilGGjlj9xuN+ 2G79P7qLmoSSuO9s= X-Received: by 2002:a05:6870:602a:b0:f1:42cf:8296 with SMTP id t42-20020a056870602a00b000f142cf8296mr1230076oaa.111.1652423363692; Thu, 12 May 2022 23:29:23 -0700 (PDT) X-Google-Smtp-Source: ABdhPJx8us6WSnAEa2cEwTy0yNLxu1UcP6pO/pKTmEDeislob/awfOYAmWS6f6U0xn8cGQq4EeW3MQ== X-Received: by 2002:a05:6870:602a:b0:f1:42cf:8296 with SMTP id t42-20020a056870602a00b000f142cf8296mr1230066oaa.111.1652423363456; Thu, 12 May 2022 23:29:23 -0700 (PDT) Received: from localhost.localdomain ([2804:431:c7f0:55e:b3e6:9ebe:4b75:fe72]) by smtp.gmail.com with ESMTPSA id a14-20020a05680804ce00b00325cda1ffbasm678341oie.57.2022.05.12.23.29.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 May 2022 23:29:22 -0700 (PDT) From: Leonardo Bras To: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Paolo Bonzini , Elena Ufimtseva , Jagannathan Raman , John G Johnson , =?utf-8?q?Daniel_P=2E_Berrang?= =?utf-8?q?=C3=A9?= , Juan Quintela , "Dr. David Alan Gilbert" , Eric Blake , Markus Armbruster , Fam Zheng , Peter Xu Cc: Leonardo Bras , qemu-devel@nongnu.org, qemu-block@nongnu.org Subject: [PATCH v13 4/8] migration: Add zero-copy-send parameter for QMP/HMP for Linux Date: Fri, 13 May 2022 03:28:33 -0300 Message-Id: <20220513062836.965425-5-leobras@redhat.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220513062836.965425-1-leobras@redhat.com> References: <20220513062836.965425-1-leobras@redhat.com> MIME-Version: 1.0 Received-SPF: pass client-ip=170.10.133.124; envelope-from=leobras@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable 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" Add property that allows zero-copy migration of memory pages on the sending side, and also includes a helper function migrate_use_zero_copy_send() to check if it's enabled. No code is introduced to actually do the migration, but it allow future implementations to enable/disable this feature. On non-Linux builds this parameter is compiled-out. Signed-off-by: Leonardo Bras Reviewed-by: Peter Xu Reviewed-by: Daniel P. Berrangé Reviewed-by: Juan Quintela Acked-by: Markus Armbruster --- qapi/migration.json | 24 ++++++++++++++++++++++++ migration/migration.h | 5 +++++ migration/migration.c | 32 ++++++++++++++++++++++++++++++++ migration/socket.c | 11 +++++++++-- monitor/hmp-cmds.c | 6 ++++++ 5 files changed, 76 insertions(+), 2 deletions(-) diff --git a/qapi/migration.json b/qapi/migration.json index 409eb086a2..2222f44250 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -741,6 +741,13 @@ # will consume more CPU. # Defaults to 1. (Since 5.0) # +# @zero-copy-send: Controls behavior on sending memory pages on migration. +# When true, enables a zero-copy mechanism for sending +# memory pages, if host supports it. +# Requires that QEMU be permitted to use locked memory +# for guest RAM pages. +# Defaults to false. (Since 7.1) +# # @block-bitmap-mapping: Maps block nodes and bitmaps on them to # aliases for the purpose of dirty bitmap migration. Such # aliases may for example be the corresponding names on the @@ -780,6 +787,7 @@ 'xbzrle-cache-size', 'max-postcopy-bandwidth', 'max-cpu-throttle', 'multifd-compression', 'multifd-zlib-level' ,'multifd-zstd-level', + { 'name': 'zero-copy-send', 'if' : 'CONFIG_LINUX'}, 'block-bitmap-mapping' ] } ## @@ -906,6 +914,13 @@ # will consume more CPU. # Defaults to 1. (Since 5.0) # +# @zero-copy-send: Controls behavior on sending memory pages on migration. +# When true, enables a zero-copy mechanism for sending +# memory pages, if host supports it. +# Requires that QEMU be permitted to use locked memory +# for guest RAM pages. +# Defaults to false. (Since 7.1) +# # @block-bitmap-mapping: Maps block nodes and bitmaps on them to # aliases for the purpose of dirty bitmap migration. Such # aliases may for example be the corresponding names on the @@ -960,6 +975,7 @@ '*multifd-compression': 'MultiFDCompression', '*multifd-zlib-level': 'uint8', '*multifd-zstd-level': 'uint8', + '*zero-copy-send': { 'type': 'bool', 'if': 'CONFIG_LINUX' }, '*block-bitmap-mapping': [ 'BitmapMigrationNodeAlias' ] } } ## @@ -1106,6 +1122,13 @@ # will consume more CPU. # Defaults to 1. (Since 5.0) # +# @zero-copy-send: Controls behavior on sending memory pages on migration. +# When true, enables a zero-copy mechanism for sending +# memory pages, if host supports it. +# Requires that QEMU be permitted to use locked memory +# for guest RAM pages. +# Defaults to false. (Since 7.1) +# # @block-bitmap-mapping: Maps block nodes and bitmaps on them to # aliases for the purpose of dirty bitmap migration. Such # aliases may for example be the corresponding names on the @@ -1158,6 +1181,7 @@ '*multifd-compression': 'MultiFDCompression', '*multifd-zlib-level': 'uint8', '*multifd-zstd-level': 'uint8', + '*zero-copy-send': { 'type': 'bool', 'if': 'CONFIG_LINUX' }, '*block-bitmap-mapping': [ 'BitmapMigrationNodeAlias' ] } } ## diff --git a/migration/migration.h b/migration/migration.h index a863032b71..e8f2941a55 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -375,6 +375,11 @@ MultiFDCompression migrate_multifd_compression(void); int migrate_multifd_zlib_level(void); int migrate_multifd_zstd_level(void); +#ifdef CONFIG_LINUX +bool migrate_use_zero_copy_send(void); +#else +#define migrate_use_zero_copy_send() (false) +#endif int migrate_use_xbzrle(void); uint64_t migrate_xbzrle_cache_size(void); bool migrate_colo_enabled(void); diff --git a/migration/migration.c b/migration/migration.c index 5a31b23bd6..3e91f4b5e2 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -910,6 +910,10 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp) params->multifd_zlib_level = s->parameters.multifd_zlib_level; params->has_multifd_zstd_level = true; params->multifd_zstd_level = s->parameters.multifd_zstd_level; +#ifdef CONFIG_LINUX + params->has_zero_copy_send = true; + params->zero_copy_send = s->parameters.zero_copy_send; +#endif params->has_xbzrle_cache_size = true; params->xbzrle_cache_size = s->parameters.xbzrle_cache_size; params->has_max_postcopy_bandwidth = true; @@ -1567,6 +1571,11 @@ static void migrate_params_test_apply(MigrateSetParameters *params, if (params->has_multifd_compression) { dest->multifd_compression = params->multifd_compression; } +#ifdef CONFIG_LINUX + if (params->has_zero_copy_send) { + dest->zero_copy_send = params->zero_copy_send; + } +#endif if (params->has_xbzrle_cache_size) { dest->xbzrle_cache_size = params->xbzrle_cache_size; } @@ -1679,6 +1688,11 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp) if (params->has_multifd_compression) { s->parameters.multifd_compression = params->multifd_compression; } +#ifdef CONFIG_LINUX + if (params->has_zero_copy_send) { + s->parameters.zero_copy_send = params->zero_copy_send; + } +#endif if (params->has_xbzrle_cache_size) { s->parameters.xbzrle_cache_size = params->xbzrle_cache_size; xbzrle_cache_resize(params->xbzrle_cache_size, errp); @@ -2563,6 +2577,17 @@ int migrate_multifd_zstd_level(void) return s->parameters.multifd_zstd_level; } +#ifdef CONFIG_LINUX +bool migrate_use_zero_copy_send(void) +{ + MigrationState *s; + + s = migrate_get_current(); + + return s->parameters.zero_copy_send; +} +#endif + int migrate_use_xbzrle(void) { MigrationState *s; @@ -4206,6 +4231,10 @@ static Property migration_properties[] = { DEFINE_PROP_UINT8("multifd-zstd-level", MigrationState, parameters.multifd_zstd_level, DEFAULT_MIGRATE_MULTIFD_ZSTD_LEVEL), +#ifdef CONFIG_LINUX + DEFINE_PROP_BOOL("zero_copy_send", MigrationState, + parameters.zero_copy_send, false), +#endif DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState, parameters.xbzrle_cache_size, DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE), @@ -4303,6 +4332,9 @@ static void migration_instance_init(Object *obj) params->has_multifd_compression = true; params->has_multifd_zlib_level = true; params->has_multifd_zstd_level = true; +#ifdef CONFIG_LINUX + params->has_zero_copy_send = true; +#endif params->has_xbzrle_cache_size = true; params->has_max_postcopy_bandwidth = true; params->has_max_cpu_throttle = true; diff --git a/migration/socket.c b/migration/socket.c index 05705a32d8..3754d8f72c 100644 --- a/migration/socket.c +++ b/migration/socket.c @@ -74,9 +74,16 @@ static void socket_outgoing_migration(QIOTask *task, if (qio_task_propagate_error(task, &err)) { trace_migration_socket_outgoing_error(error_get_pretty(err)); - } else { - trace_migration_socket_outgoing_connected(data->hostname); + goto out; } + + trace_migration_socket_outgoing_connected(data->hostname); + + if (migrate_use_zero_copy_send()) { + error_setg(&err, "Zero copy send not available in migration"); + } + +out: migration_channel_connect(data->s, sioc, data->hostname, err); object_unref(OBJECT(sioc)); } diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c index 93061a11af..622c783c32 100644 --- a/monitor/hmp-cmds.c +++ b/monitor/hmp-cmds.c @@ -1309,6 +1309,12 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict) p->has_multifd_zstd_level = true; visit_type_uint8(v, param, &p->multifd_zstd_level, &err); break; +#ifdef CONFIG_LINUX + case MIGRATION_PARAMETER_ZERO_COPY_SEND: + p->has_zero_copy_send = true; + visit_type_bool(v, param, &p->zero_copy_send, &err); + break; +#endif case MIGRATION_PARAMETER_XBZRLE_CACHE_SIZE: p->has_xbzrle_cache_size = true; if (!visit_type_size(v, param, &cache_size, &err)) {