From nobody Wed Nov 27 11:42:57 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=1699271572; cv=none; d=zohomail.com; s=zohoarc; b=mM4q9KJxvltCcsNDeT/LbLhEp2PLDD4xLD2MxAk48ZaJrT84S6d6tfRWga0Txo0PLMTWMygzS+g8hDwjddDLE41DN0gNWBcVUjRpY2tAl4RAiurJ0yF66rdIdMGWtMWQg94VMzxqNyfadr3rnvKAlV0/wUFZLwpganY4lqm08uA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1699271572; h=Content-Type: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=svaPW+rZPenlPAj6lm7d9unZr33RLfmLMwt20wLjubk=; b=FF1OlUeSkVnDnz6jc2GAw+xrkSjNxhmTlzgyM8OURI/k3r0kLO1n/0Le83sC5iKzcogy39ZZm2sjTCs7cNJy56pdaih6Px7J7uvsWIr+y6TtI1KqXjlkUSZ2JedvVOaS+mMnXAR9vf2rARtajrwpD/vXCUBdAhXGVe5ZaihQbJU= 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 1699271572400131.50915894480227; Mon, 6 Nov 2023 03:52:52 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qzxuJ-0003Xi-VT; Mon, 06 Nov 2023 06:36:39 -0500 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 1qzxuJ-0003W9-1c for qemu-devel@nongnu.org; Mon, 06 Nov 2023 06:36:39 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qzxuH-0003Pr-Hd for qemu-devel@nongnu.org; Mon, 06 Nov 2023 06:36:38 -0500 Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-501-m5Mjh_RZPammzu2xEslPVA-1; Mon, 06 Nov 2023 06:36:35 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B20F11C02D45; Mon, 6 Nov 2023 11:36:34 +0000 (UTC) Received: from localhost (unknown [10.39.208.31]) by smtp.corp.redhat.com (Postfix) with ESMTP id A66F025C0; Mon, 6 Nov 2023 11:36:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1699270596; 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=svaPW+rZPenlPAj6lm7d9unZr33RLfmLMwt20wLjubk=; b=WQqJnm9XByh9hyECQeryB99QilM0Y782Iq9mUfCTp+ieL7LVCiu5CQ8B7pVzcIdXkJtlYW iegmBEUBCkfKT6TS9FsDMpYSzwz8T07vxrU2fZAaHradSPARuzkNORHOTm0dndDi3D0u6i qr7+0MUtWLXqm6+gbXMA4TBROKVehFo= X-MC-Unique: m5Mjh_RZPammzu2xEslPVA-1 From: marcandre.lureau@redhat.com To: qemu-devel@nongnu.org Cc: Peter Xu , Samuel Thibault , Kevin Wolf , Juan Quintela , Fabiano Rosas , "Michael S. Tsirkin" , Leonardo Bras , qemu-block@nongnu.org, Hanna Reitz , Jason Wang , John Snow , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= Subject: [PATCH v3 6/6] docs/migration: reflect the changes about needed subsections Date: Mon, 6 Nov 2023 15:36:00 +0400 Message-ID: <20231106113601.2052601-7-marcandre.lureau@redhat.com> In-Reply-To: <20231106113601.2052601-1-marcandre.lureau@redhat.com> References: <20231106113601.2052601-1-marcandre.lureau@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.1 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=marcandre.lureau@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, 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 @redhat.com) X-ZM-MESSAGEID: 1699271573322100003 From: Marc-Andr=C3=A9 Lureau Signed-off-by: Marc-Andr=C3=A9 Lureau Reviewed-by: Juan Quintela --- docs/devel/migration.rst | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-) diff --git a/docs/devel/migration.rst b/docs/devel/migration.rst index 240eb16d90..22875ac40c 100644 --- a/docs/devel/migration.rst +++ b/docs/devel/migration.rst @@ -246,17 +246,16 @@ a newer form of device, or adding that state that you= previously forgot to migrate. This is best solved using a subsection. =20 A subsection is "like" a device vmstate, but with a particularity, it -has a Boolean function that tells if that values are needed to be sent -or not. If this functions returns false, the subsection is not sent. -Subsections have a unique name, that is looked for on the receiving -side. +has a Boolean function that tells if that values are needed or not. If +this functions returns false, the subsection is not sent. Subsections +have a unique name, that is looked for on the receiving side. =20 On the receiving side, if we found a subsection for a device that we -don't understand, we just fail the migration. If we understand all -the subsections, then we load the state with success. There's no check -that a subsection is loaded, so a newer QEMU that knows about a subsection -can (with care) load a stream from an older QEMU that didn't send -the subsection. +don't understand, we just fail the migration. If we understand all the +subsections, then we load the state with success. There's no check +that an optional subsection is loaded, so a newer QEMU that knows +about a subsection can (with care) load a stream from an older QEMU +that didn't send the subsection. =20 If the new data is only needed in a rare case, then the subsection can be made conditional on that case and the migration will still --=20 2.41.0