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Tsirkin" , Marcel Apfelbaum , Peter Xu , Fabiano Rosas , Steve Sistare Subject: [PATCH V4 06/43] migration: lower handler priority Date: Thu, 29 May 2025 12:24:02 -0700 Message-Id: <1748546679-154091-7-git-send-email-steven.sistare@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1748546679-154091-1-git-send-email-steven.sistare@oracle.com> References: <1748546679-154091-1-git-send-email-steven.sistare@oracle.com> X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-05-29_09,2025-05-29_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 phishscore=0 suspectscore=0 adultscore=0 malwarescore=0 bulkscore=0 mlxscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2505160000 definitions=main-2505290189 X-Proofpoint-GUID: 6gZuCshl2P95IBGE_XggaBzrgsadqNSX X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNTI5MDE4OSBTYWx0ZWRfX8KPrfELRUcA7 bFjOJRY0/cnOJw4B8Xtrmy57zpTBRoGxKmGuaZ7VLbAcaRGn9FgpQvUcLv4foKwg6nZNWmoWUBi N8z66k66NBBKeLQZic7+3lNbejAISCCGugtIITXpssMCZ111MVpAZtn1pSRRJQiyx28bRel99eC eS+hilNoURzEgXz346GgWEo84ptNOwW18l0xxbcyjnMZ31AO7de+kZ1RsExrM94ivco8CGec+9C moFbBCeOjlyotvxtRcRh06ZMg4RxhlM+4kPW9J12DVW6rn+G62uMIp3/JfqyPI54zZTxydC7sSw BAV32PZBX4DFIjC8erk2beO/bpHkcjycjkenx7oplUuPd3OgMhckjojLBBkmnYEkin8ybU5CpGq WkQEpsm/H7PvlNMWUXra18RzlXzHLo3Kcm+QTpbr3uap7AJCAQgojkl3nO7yA/cezoKCY7/P X-Proofpoint-ORIG-GUID: 6gZuCshl2P95IBGE_XggaBzrgsadqNSX X-Authority-Analysis: v=2.4 cv=N7MpF39B c=1 sm=1 tr=0 ts=6838b47f cx=c_pps a=XiAAW1AwiKB2Y8Wsi+sD2Q==:117 a=XiAAW1AwiKB2Y8Wsi+sD2Q==:17 a=dt9VzEwgFbYA:10 a=yPCof4ZbAAAA:8 a=20KFwNOVAAAA:8 a=AmUmXUaXWCDEmLEOI0wA:9 Received-SPF: pass client-ip=205.220.165.32; envelope-from=steven.sistare@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -32 X-Spam_score: -3.3 X-Spam_bar: --- X-Spam_report: (-3.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.499, 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, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=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 Define a vmstate priority that is lower than the default, so its handlers run after all default priority handlers. Since 0 is no longer the default priority, translate an uninitialized priority of 0 to MIG_PRI_DEFAULT. CPR for vfio will use this to install handlers for containers that run after handlers for the devices that they contain. Signed-off-by: Steve Sistare Reviewed-by: Fabiano Rosas Reviewed-by: Peter Xu --- include/migration/vmstate.h | 6 +++++- migration/savevm.c | 4 ++-- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h index a1dfab4..1ff7bd9 100644 --- a/include/migration/vmstate.h +++ b/include/migration/vmstate.h @@ -155,7 +155,11 @@ enum VMStateFlags { }; typedef enum { - MIG_PRI_DEFAULT = 0, + MIG_PRI_UNINITIALIZED = 0, /* An uninitialized priority field maps to */ + /* MIG_PRI_DEFAULT in save_state_priority */ + + MIG_PRI_LOW, /* Must happen after default */ + MIG_PRI_DEFAULT, MIG_PRI_IOMMU, /* Must happen before PCI devices */ MIG_PRI_PCI_BUS, /* Must happen before IOMMU */ MIG_PRI_VIRTIO_MEM, /* Must happen before IOMMU */ diff --git a/migration/savevm.c b/migration/savevm.c index 006514c..7e87815 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -266,7 +266,7 @@ typedef struct SaveState { static SaveState savevm_state = { .handlers = QTAILQ_HEAD_INITIALIZER(savevm_state.handlers), - .handler_pri_head = { [MIG_PRI_DEFAULT ... MIG_PRI_MAX] = NULL }, + .handler_pri_head = { [0 ... MIG_PRI_MAX] = NULL }, .global_section_id = 0, }; @@ -737,7 +737,7 @@ static int calculate_compat_instance_id(const char *idstr) static inline MigrationPriority save_state_priority(SaveStateEntry *se) { - if (se->vmsd) { + if (se->vmsd && se->vmsd->priority) { return se->vmsd->priority; } return MIG_PRI_DEFAULT; -- 1.8.3.1