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Thu, 19 Oct 2023 20:47:54 +0000 Received: from iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 39JKllWO014514; Thu, 19 Oct 2023 20:47:53 GMT Received: from ca-dev63.us.oracle.com (ca-dev63.us.oracle.com [10.211.8.221]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTP id 3trfyqqafy-5; Thu, 19 Oct 2023 20:47:53 +0000 From: Steve Sistare To: qemu-devel@nongnu.org Cc: Juan Quintela , Peter Xu , Fabiano Rosas , Leonardo Bras , Steve Sistare Subject: [PATCH V1 4/4] cpr: reboot mode Date: Thu, 19 Oct 2023 13:47:46 -0700 Message-Id: <1697748466-373230-5-git-send-email-steven.sistare@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1697748466-373230-1-git-send-email-steven.sistare@oracle.com> References: <1697748466-373230-1-git-send-email-steven.sistare@oracle.com> X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-19_20,2023-10-19_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 adultscore=0 phishscore=0 spamscore=0 suspectscore=0 malwarescore=0 bulkscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310190176 X-Proofpoint-GUID: zYXW5Y3qR-_C0SYPhc9NRoeLlHooa121 X-Proofpoint-ORIG-GUID: zYXW5Y3qR-_C0SYPhc9NRoeLlHooa121 Received-SPF: pass client-ip=205.220.177.32; envelope-from=steven.sistare@oracle.com; helo=mx0b-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org 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. The guest RAM memory-backend must be shared, and the @x-ignore-shared migration capability must be set, to avoid saving RAM to the file. 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 --- qapi/migration.json | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/qapi/migration.json b/qapi/migration.json index 184fb78..2d862fa 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -620,9 +620,23 @@ # # @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. The guest RAM memory-backend +# must be shared, and the @x-ignore-shared migration capability +# must be set, to avoid saving it to the file. 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: