From patchwork Thu Nov 2 11:40:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Juan Quintela X-Patchwork-Id: 13443637 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 84EBAC4167B for ; Thu, 2 Nov 2023 11:44:27 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qyW7Z-0001uF-C4; Thu, 02 Nov 2023 07:44:23 -0400 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 1qyW7V-0001QU-JO for qemu-devel@nongnu.org; Thu, 02 Nov 2023 07:44:17 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qyW7T-00065k-1C for qemu-devel@nongnu.org; Thu, 02 Nov 2023 07:44:17 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1698925454; 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=A3urJpzcWBNu+N6FvtT6GHVVyu20J9BGWB+Gu+5Odqc=; b=P8UPdE5oXJZO9YlgfGV2xtcfRn96+8oFokt09TAoAGG2Jyypoup4eHw/X1KD4E12fq5J5Q 7tK3gDE8L5jsAXk7MpcUnGG3qgERLXUqBsbUDJHdbPS17/NDgc4dl7H4Ot5Q6i4d5rPsIm da5TGiv+5uQlXyMzElXmfqwmL+IO+7Y= 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-390-bFZVhtncMQC8XQuQrStdiQ-1; Thu, 02 Nov 2023 07:44:09 -0400 X-MC-Unique: bFZVhtncMQC8XQuQrStdiQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (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 9A933380662F; Thu, 2 Nov 2023 11:44:07 +0000 (UTC) Received: from secure.mitica (unknown [10.39.195.26]) by smtp.corp.redhat.com (Postfix) with ESMTP id 365552026D4C; Thu, 2 Nov 2023 11:44:00 +0000 (UTC) From: Juan Quintela To: qemu-devel@nongnu.org Cc: Eric Farman , Laurent Vivier , David Gibson , qemu-block@nongnu.org, Stefan Hajnoczi , Marcel Apfelbaum , Kevin Wolf , David Hildenbrand , Samuel Thibault , qemu-s390x@nongnu.org, Richard Henderson , Leonardo Bras , Corey Minyard , Ilya Leoshkevich , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Markus Armbruster , Christian Borntraeger , Eduardo Habkost , Paolo Bonzini , qemu-ppc@nongnu.org, "Michael S. Tsirkin" , Peter Maydell , Halil Pasic , Gerd Hoffmann , =?utf-8?q?C=C3=A9dric_Le_Goater?= , Li Zhijian , Eric Blake , "Denis V. Lunev" , Hanna Reitz , Fabiano Rosas , Stefan Berger , qemu-arm@nongnu.org, Daniel Henrique Barboza , Thomas Huth , Corey Minyard , John Snow , Jeff Cody , Peter Xu , Nicholas Piggin , Juan Quintela , Harsh Prateek Bora , Jason Wang , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Stefan Weil , Mark Cave-Ayland , Fam Zheng , Steve Sistare Subject: [PULL 24/40] cpr: reboot mode Date: Thu, 2 Nov 2023 12:40:38 +0100 Message-ID: <20231102114054.44360-25-quintela@redhat.com> In-Reply-To: <20231102114054.44360-1-quintela@redhat.com> References: <20231102114054.44360-1-quintela@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 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: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.393, 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, 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-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Steve Sistare Add the cpr-reboot migration mode. Usage: $ qemu-system-$arch -monitor stdio ... QEMU 8.1.50 monitor - type 'help' for more information (qemu) migrate_set_capability x-ignore-shared on (qemu) migrate_set_parameter mode cpr-reboot (qemu) migrate -d file:vm.state (qemu) info status VM status: paused (postmigrate) (qemu) quit $ qemu-system-$arch -monitor stdio -incoming defer ... QEMU 8.1.50 monitor - type 'help' for more information (qemu) migrate_set_capability x-ignore-shared on (qemu) migrate_set_parameter mode cpr-reboot (qemu) migrate_incoming file:vm.state (qemu) info status VM status: running In this mode, the migrate command saves state to a file, allowing one to quit qemu, reboot to an updated kernel, and restart an updated version of qemu. The caller must specify a migration URI that writes to and reads from a file. Unlike normal mode, the use of certain local storage options does not block the migration, but the caller must not modify guest block devices between the quit and restart. To avoid saving guest RAM to the file, the memory backend must be shared, and the @x-ignore-shared migration capability must be set. Guest RAM must be non-volatile across reboot, such as by backing it with a dax device, but this is not enforced. The restarted qemu arguments must match those used to initially start qemu, plus the -incoming option. Signed-off-by: Steve Sistare Reviewed-by: Juan Quintela Signed-off-by: Juan Quintela Message-ID: <1698263069-406971-6-git-send-email-steven.sistare@oracle.com> --- qapi/migration.json | 15 ++++++++++++++- hw/core/qdev-properties-system.c | 2 +- 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/qapi/migration.json b/qapi/migration.json index 47c02a9346..3daeffc95d 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -636,9 +636,22 @@ # # @normal: the original form of migration. (since 8.2) # +# @cpr-reboot: The migrate command saves state to a file, allowing one to +# quit qemu, reboot to an updated kernel, and restart an updated +# version of qemu. The caller must specify a migration URI +# that writes to and reads from a file. Unlike normal mode, +# the use of certain local storage options does not block the +# migration, but the caller must not modify guest block devices +# between the quit and restart. To avoid saving guest RAM to the +# file, the memory backend must be shared, and the @x-ignore-shared +# migration capability must be set. Guest RAM must be non-volatile +# across reboot, such as by backing it with a dax device, but this +# is not enforced. The restarted qemu arguments must match those +# used to initially start qemu, plus the -incoming option. +# (since 8.2) ## { 'enum': 'MigMode', - 'data': [ 'normal' ] } + 'data': [ 'normal', 'cpr-reboot' ] } ## # @BitmapMigrationBitmapAliasTransform: diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c index b9179e8917..2f1dbb3fd7 100644 --- a/hw/core/qdev-properties-system.c +++ b/hw/core/qdev-properties-system.c @@ -680,7 +680,7 @@ QEMU_BUILD_BUG_ON(sizeof(MigMode) != sizeof(int)); const PropertyInfo qdev_prop_mig_mode = { .name = "MigMode", .description = "mig_mode values, " - "normal", + "normal,cpr-reboot", .enum_table = &MigMode_lookup, .get = qdev_propinfo_get_enum, .set = qdev_propinfo_set_enum,