From mboxrd@z Thu Jan 1 00:00:00 1970 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 C6A77C4332F for ; Wed, 4 Jan 2023 17:24:50 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pD7Ul-0002hh-Dd; Wed, 04 Jan 2023 12:24:07 -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 1pD7Uj-0002hE-Pw for qemu-devel@nongnu.org; Wed, 04 Jan 2023 12:24:05 -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 1pD7Uh-0007sv-Jt for qemu-devel@nongnu.org; Wed, 04 Jan 2023 12:24:05 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1672853041; 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: in-reply-to:in-reply-to:references:references; bh=+fbscNjl8kB8+/aweqlu8Rh7fmqFtY4TlB1L9/evAVg=; b=TApe5lHKBKhaMVosSm7rNmX0XB+ZbTyYY+Mljo5HIjZQ1rpoHGjWl7Pg9EvZPkJp+BZd8i zboJ/yYqNJbFzNw3/NzaRCq1oF/62LzSNtXPoAQB9JOobjQU2gpCl5WtWjCbfGTHzUA+YR skOdAZCSJZxrF3ZaFNesrvtTyzjUimY= Received: from mail-qk1-f199.google.com (mail-qk1-f199.google.com [209.85.222.199]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_128_GCM_SHA256) id us-mta-591-VhcPSUFeM3u37yeGH_aV9g-1; Wed, 04 Jan 2023 12:24:00 -0500 X-MC-Unique: VhcPSUFeM3u37yeGH_aV9g-1 Received: by mail-qk1-f199.google.com with SMTP id bm30-20020a05620a199e00b006ff813575b1so23522039qkb.16 for ; Wed, 04 Jan 2023 09:24:00 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=+fbscNjl8kB8+/aweqlu8Rh7fmqFtY4TlB1L9/evAVg=; b=zkvA3H7NMvYfpWQOTpbxZmzc6037u5pyC2PnqT9L+9FKJuTwpqqlYoF9GNafkJFuqB Go15vZV9frOle7yMlA6ujIQ43CXalpF9hnV8mMIRZGCg77MCD/3SB5f6eQbdiLDLhAfv AkeXECUolcXQkFwFWySYcNqmUdxt86eX+mkxZ+XnMdWqogu90HN1R2hb50BBtINoRUAT 7/UORvU3k0TZxlqUq6gufkOCUSoZjc/z2qN9YoX4gzJABbLPCdnT6NWNLh8/eg6j4t2o NzlTHY1z/bI6KBOEcLPtub6baOk6UAXyP1pdfSHIQ9B6zFOjpFueCg7BYz4z1Sn0ttuJ 5tXQ== X-Gm-Message-State: AFqh2koiGulUpcu6QpEzbgnSONj7SHOh/eI2nRgI99RVWsnQNCzJGwB/ NsyW4SzsW4IWy5fxbKtmb/PPbwzt6orHSLuAwwiz2RJVeMlHzm7V/1emEGKZMt6FvsGFXclx7QV yEDznZecLQlBmvBk= X-Received: by 2002:ac8:4519:0:b0:39c:da20:609 with SMTP id q25-20020ac84519000000b0039cda200609mr67803972qtn.19.1672853040000; Wed, 04 Jan 2023 09:24:00 -0800 (PST) X-Google-Smtp-Source: AMrXdXviDAtad8aZ7oHcrTJUmI7K547Lf65X7f3QHf8O5O22MnDuvGpF2GH+BnfBTAszer/lZO+reQ== X-Received: by 2002:ac8:4519:0:b0:39c:da20:609 with SMTP id q25-20020ac84519000000b0039cda200609mr67803954qtn.19.1672853039781; Wed, 04 Jan 2023 09:23:59 -0800 (PST) Received: from x1n (bras-base-aurron9127w-grc-39-70-52-228-144.dsl.bell.ca. [70.52.228.144]) by smtp.gmail.com with ESMTPSA id gc11-20020a05622a59cb00b003a50d92f9b4sm20637836qtb.1.2023.01.04.09.23.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Jan 2023 09:23:59 -0800 (PST) Date: Wed, 4 Jan 2023 12:23:58 -0500 From: Peter Xu To: David Hildenbrand Cc: qemu-devel@nongnu.org, "Dr . David Alan Gilbert" , Juan Quintela , "Michael S . Tsirkin" , Michal Privoznik Subject: Re: [PATCH v3 1/6] migration: Allow immutable device state to be migrated early (i.e., before RAM) Message-ID: References: <20221222110215.130392-1-david@redhat.com> <20221222110215.130392-2-david@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20221222110215.130392-2-david@redhat.com> Received-SPF: pass client-ip=170.10.129.124; envelope-from=peterx@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_H2=-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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Thu, Dec 22, 2022 at 12:02:10PM +0100, David Hildenbrand wrote: > Migrating device state before we start iterating is currently impossible. > Introduce and use qemu_savevm_state_start_precopy(), and use > a new special migration priority -- MIG_PRI_POST_SETUP -- to decide whether > state will be saved in qemu_savevm_state_start_precopy() or in > qemu_savevm_state_complete_precopy_*(). Can something like this be done in qemu_savevm_state_setup()? Thanks, -- Peter Xu