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d="scan'208";a="358110384" X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10725"; a="739435466" X-IronPort-AV: E=Sophos;i="6.00,203,1681196400"; d="scan'208";a="739435466" From: Wei Wang To: quintela@redhat.com, peterx@redhat.com, lei4.wang@intel.com Cc: qemu-devel@nongnu.org, Wei Wang Subject: [PATCH v2 1/2] migration: enfocre multifd and postcopy preempt to be set before incoming Date: Tue, 30 May 2023 17:02:58 +0800 Message-Id: <20230530090259.189462-2-wei.w.wang@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20230530090259.189462-1-wei.w.wang@intel.com> References: <20230530090259.189462-1-wei.w.wang@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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=134.134.136.65; envelope-from=wei.w.wang@intel.com; helo=mga03.intel.com X-Spam_score_int: -45 X-Spam_score: -4.6 X-Spam_bar: ---- X-Spam_report: (-4.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.16, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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 @intel.com) X-ZM-MESSAGEID: 1685437454880100001 Content-Type: text/plain; charset="utf-8" qemu_start_incoming_migration needs to check the number of multifd channels or postcopy ram channels to configure the backlog parameter (i.e. the maximum length to which the queue of pending connections for sockfd may grow) of listen(). So enforce the usage of postcopy-preempt and multifd as below: - need to use "-incoming defer" on the destination; and - set_capability and set_parameter need to be done before migrate_incoming Otherwise, disable the use of the features and report error messages to remind users to adjust the commands. Signed-off-by: Wei Wang Reviewed-by: Peter Xu --- migration/options.c | 36 +++++++++++++++++++++++++++++++----- 1 file changed, 31 insertions(+), 5 deletions(-) diff --git a/migration/options.c b/migration/options.c index a560483871..954a39aa6d 100644 --- a/migration/options.c +++ b/migration/options.c @@ -415,6 +415,11 @@ INITIALIZE_MIGRATE_CAPS_SET(check_caps_background_snap= shot, MIGRATION_CAPABILITY_VALIDATE_UUID, MIGRATION_CAPABILITY_ZERO_COPY_SEND); =20 +static bool migrate_incoming_started(void) +{ + return !!migration_incoming_get_current()->transport_data; +} + /** * @migration_caps_check - check capability compatibility * @@ -538,6 +543,12 @@ bool migrate_caps_check(bool *old_caps, bool *new_caps= , Error **errp) error_setg(errp, "Postcopy preempt not compatible with compres= s"); return false; } + + if (migrate_incoming_started()) { + error_setg(errp, + "Postcopy preempt must be set before incoming start= s"); + return false; + } } =20 if (new_caps[MIGRATION_CAPABILITY_MULTIFD]) { @@ -545,6 +556,10 @@ bool migrate_caps_check(bool *old_caps, bool *new_caps= , Error **errp) error_setg(errp, "Multifd is not compatible with compress"); return false; } + if (migrate_incoming_started()) { + error_setg(errp, "Multifd must be set before incoming starts"); + return false; + } } =20 return true; @@ -998,11 +1013,22 @@ bool migrate_params_check(MigrationParameters *param= s, Error **errp) =20 /* x_checkpoint_delay is now always positive */ =20 - if (params->has_multifd_channels && (params->multifd_channels < 1)) { - error_setg(errp, QERR_INVALID_PARAMETER_VALUE, - "multifd_channels", - "a value between 1 and 255"); - return false; + if (params->has_multifd_channels) { + if (params->multifd_channels < 1) { + error_setg(errp, QERR_INVALID_PARAMETER_VALUE, + "multifd_channels", + "a value between 1 and 255"); + return false; + } + if (migrate_incoming_started()) { + MigrationState *ms =3D migrate_get_current(); + + ms->capabilities[MIGRATION_CAPABILITY_MULTIFD] =3D false; + error_setg(errp, QERR_INVALID_PARAMETER_VALUE, + "multifd_channels", + "must be set before incoming starts"); + return false; + } } =20 if (params->has_multifd_zlib_level && --=20 2.27.0