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Tsirkin" , Jason Wang , Alex Williamson , Cedric Le Goater , Gerd Hoffmann , Marc-Andre Lureau , Steve Sistare Subject: [PATCH V1 3/3] vfio: allow cpr-reboot migration if suspended Date: Wed, 13 Dec 2023 10:11:33 -0800 Message-Id: <1702491093-383782-4-git-send-email-steven.sistare@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1702491093-383782-1-git-send-email-steven.sistare@oracle.com> References: <1702491093-383782-1-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=2023-12-13_12,2023-12-13_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 malwarescore=0 mlxlogscore=999 adultscore=0 phishscore=0 suspectscore=0 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2312130130 X-Proofpoint-GUID: vShOFdeWYQF0jQa2o63qpnqCwXdd9du4 X-Proofpoint-ORIG-GUID: vShOFdeWYQF0jQa2o63qpnqCwXdd9du4 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, 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 --- note: vfio_cpr_register_container is trivial in this patch and could be squashed, but it is expanded in future patches for cpr-exec mode. --- --- hw/vfio/common.c | 2 +- hw/vfio/container.c | 11 ++++++++++- hw/vfio/cpr.c | 42 ++++++++++++++++++++++++++++++++++++++++++ hw/vfio/meson.build | 1 + hw/vfio/migration.c | 2 +- include/hw/vfio/vfio-common.h | 4 ++++ migration/ram.c | 9 +++++---- 7 files changed, 64 insertions(+), 7 deletions(-) create mode 100644 hw/vfio/cpr.c diff --git a/hw/vfio/common.c b/hw/vfio/common.c index e70fdf5..833a528 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/container.c b/hw/vfio/container.c index 2420100..ddae95e 100644 --- a/hw/vfio/container.c +++ b/hw/vfio/container.c @@ -558,10 +558,15 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as, goto free_container_exit; } + ret = vfio_cpr_register_container(container, errp); + if (ret) { + goto free_container_exit; + } + ret = vfio_ram_block_discard_disable(container, true); if (ret) { error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken"); - goto free_container_exit; + goto unregister_container_exit; } switch (container->iommu_type) { @@ -638,6 +643,9 @@ listener_release_exit: enable_discards_exit: vfio_ram_block_discard_disable(container, false); +unregister_container_exit: + vfio_cpr_unregister_container(container); + free_container_exit: vfio_free_container(container); @@ -689,6 +697,7 @@ static void vfio_disconnect_container(VFIOGroup *group) } trace_vfio_disconnect_container(container->fd); + vfio_cpr_unregister_container(container); close(container->fd); vfio_free_container(container); diff --git a/hw/vfio/cpr.c b/hw/vfio/cpr.c new file mode 100644 index 0000000..f0282ed --- /dev/null +++ b/hw/vfio/cpr.c @@ -0,0 +1,42 @@ +/* + * Copyright (c) 2021-2023 Oracle and/or its affiliates. + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "hw/vfio/vfio-common.h" +#include "migration/migration.h" +#include "migration/misc.h" +#include "qapi/error.h" +#include "sysemu/runstate.h" + +static void vfio_cpr_reboot_notifier(Notifier *notifier, void *data) +{ + MigrationState *s = data; + + if (migrate_mode_of(s) == MIG_MODE_CPR_REBOOT && + !migration_has_failed(s) && + !migration_has_finished(s) && + !runstate_check(RUN_STATE_SUSPENDED)) { + + Error *err = NULL; + error_setg(&err, "VFIO device only supports cpr-reboot for " + "runstate suspended"); + migrate_set_error(s, err); + error_free(err); + } +} + +int vfio_cpr_register_container(VFIOContainer *container, Error **errp) +{ + migration_add_notifier(&container->cpr_reboot_notifier, + vfio_cpr_reboot_notifier); + return 0; +} + +void vfio_cpr_unregister_container(VFIOContainer *container) +{ + migration_remove_notifier(&container->cpr_reboot_notifier); +} diff --git a/hw/vfio/meson.build b/hw/vfio/meson.build index 2a6912c..3e1f9ad 100644 --- a/hw/vfio/meson.build +++ b/hw/vfio/meson.build @@ -5,6 +5,7 @@ vfio_ss.add(files( 'container.c', 'spapr.c', 'migration.c', + 'cpr.c', )) vfio_ss.add(when: 'CONFIG_VFIO_PCI', if_true: files( 'display.c', diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index 814132a..86d8c9e 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -902,7 +902,7 @@ 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 a4a22ac..7da1602 100644 --- a/include/hw/vfio/vfio-common.h +++ b/include/hw/vfio/vfio-common.h @@ -85,6 +85,7 @@ typedef struct VFIOContainer { int fd; /* /dev/vfio/vfio, empowered by the attached groups */ MemoryListener listener; MemoryListener prereg_listener; + Notifier cpr_reboot_notifier; unsigned iommu_type; Error *error; bool initialized; @@ -254,6 +255,9 @@ void vfio_detach_device(VFIODevice *vbasedev); int vfio_kvm_device_add_fd(int fd, Error **errp); int vfio_kvm_device_del_fd(int fd, Error **errp); +int vfio_cpr_register_container(VFIOContainer *container, Error **errp); +void vfio_cpr_unregister_container(VFIOContainer *container); + extern const MemoryRegionOps vfio_region_ops; typedef QLIST_HEAD(VFIOGroupList, VFIOGroup) VFIOGroupList; typedef QLIST_HEAD(VFIODeviceList, VFIODevice) VFIODeviceList; diff --git a/migration/ram.c b/migration/ram.c index 8c7886a..8604b97 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -2393,8 +2393,8 @@ 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 iothread lock or is in a bh, so there is * no writing race against the migration bitmap */ @@ -2805,8 +2805,9 @@ 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); }