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Tsirkin" , Jason Wang , Alex Williamson , Cedric Le Goater , Gerd Hoffmann , Marc-Andre Lureau , David Hildenbrand , Steve Sistare Subject: [PATCH V2 11/11] vfio: allow cpr-reboot migration if suspended Date: Fri, 12 Jan 2024 07:05:10 -0800 Message-Id: <1705071910-174321-12-git-send-email-steven.sistare@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1705071910-174321-1-git-send-email-steven.sistare@oracle.com> References: <1705071910-174321-1-git-send-email-steven.sistare@oracle.com> X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-01-12_06,2024-01-12_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 adultscore=0 bulkscore=0 mlxlogscore=999 suspectscore=0 phishscore=0 malwarescore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2401120117 X-Proofpoint-GUID: 2Mqs_0vYqCf0b63VTBRAg1ji1r6xIooT X-Proofpoint-ORIG-GUID: 2Mqs_0vYqCf0b63VTBRAg1ji1r6xIooT Received-SPF: pass client-ip=205.220.177.32; envelope-from=steven.sistare@oracle.com; helo=mx0b-00069f02.pphosted.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_MED=-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_H5=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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Allow cpr-reboot for vfio if the guest is in the suspended runstate. The guest drivers' suspend methods flush outstanding requests and re-initialize the devices, and thus there is no device state to save and restore. The user is responsible for suspending the guest before initiating cpr, such as by issuing guest-suspend-ram to the qemu guest agent. Relax the vfio blocker so it does not apply to cpr, and add a notifier that verifies the guest is suspended. Skip dirty page tracking, which is N/A for cpr, to avoid ioctl errors. Signed-off-by: Steve Sistare --- hw/vfio/common.c | 2 +- hw/vfio/cpr.c | 20 ++++++++++++++++++++ hw/vfio/migration.c | 2 +- include/hw/vfio/vfio-common.h | 1 + migration/ram.c | 9 +++++---- 5 files changed, 28 insertions(+), 6 deletions(-) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 0b3352f..09af934 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -128,7 +128,7 @@ int vfio_block_multiple_devices_migration(VFIODevice *vbasedev, Error **errp) error_setg(&multiple_devices_migration_blocker, "Multiple VFIO devices migration is supported only if all of " "them support P2P migration"); - ret = migrate_add_blocker(&multiple_devices_migration_blocker, errp); + ret = migrate_add_blocker_normal(&multiple_devices_migration_blocker, errp); return ret; } diff --git a/hw/vfio/cpr.c b/hw/vfio/cpr.c index bbd1c7a..9f4b1fe 100644 --- a/hw/vfio/cpr.c +++ b/hw/vfio/cpr.c @@ -7,13 +7,33 @@ #include "qemu/osdep.h" #include "hw/vfio/vfio-common.h" +#include "migration/misc.h" #include "qapi/error.h" +#include "sysemu/runstate.h" + +static int vfio_cpr_reboot_notifier(NotifierWithReturn *notifier, + MigrationEvent *e, Error **errp) +{ + if (e->state == MIGRATION_STATUS_SETUP && + !runstate_check(RUN_STATE_SUSPENDED)) { + + error_setg(errp, + "VFIO device only supports cpr-reboot for runstate suspended"); + + return -1; + } + return 0; +} int vfio_cpr_register_container(VFIOContainer *container, Error **errp) { + migration_add_notifier_mode(&container->cpr_reboot_notifier, + vfio_cpr_reboot_notifier, + MIG_MODE_CPR_REBOOT); return 0; } void vfio_cpr_unregister_container(VFIOContainer *container) { + migration_remove_notifier(&container->cpr_reboot_notifier); } diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index 534fddf..488905d 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -895,7 +895,7 @@ static int vfio_block_migration(VFIODevice *vbasedev, Error *err, Error **errp) vbasedev->migration_blocker = error_copy(err); error_free(err); - return migrate_add_blocker(&vbasedev->migration_blocker, errp); + return migrate_add_blocker_normal(&vbasedev->migration_blocker, errp); } /* ---------------------------------------------------------------------- */ diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h index 1add5b7..7a46e24 100644 --- a/include/hw/vfio/vfio-common.h +++ b/include/hw/vfio/vfio-common.h @@ -78,6 +78,7 @@ struct VFIOGroup; typedef struct VFIOContainer { VFIOContainerBase bcontainer; int fd; /* /dev/vfio/vfio, empowered by the attached groups */ + NotifierWithReturn cpr_reboot_notifier; unsigned iommu_type; QLIST_HEAD(, VFIOGroup) group_list; } VFIOContainer; diff --git a/migration/ram.c b/migration/ram.c index 1923366..44ad324 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -2392,8 +2392,8 @@ static void ram_save_cleanup(void *opaque) RAMState **rsp = opaque; RAMBlock *block; - /* We don't use dirty log with background snapshots */ - if (!migrate_background_snapshot()) { + /* We don't use dirty log with background snapshots or cpr */ + if (!migrate_background_snapshot() && migrate_mode() == MIG_MODE_NORMAL) { /* caller have hold BQL or is in a bh, so there is * no writing race against the migration bitmap */ @@ -2804,8 +2804,9 @@ static void ram_init_bitmaps(RAMState *rs) WITH_RCU_READ_LOCK_GUARD() { ram_list_init_bitmaps(); - /* We don't use dirty log with background snapshots */ - if (!migrate_background_snapshot()) { + /* We don't use dirty log with background snapshots or cpr */ + if (!migrate_background_snapshot() && + migrate_mode() == MIG_MODE_NORMAL) { memory_global_dirty_log_start(GLOBAL_DIRTY_MIGRATION); migration_bitmap_sync_precopy(rs, false); }