| Message ID | 1708622920-68779-13-git-send-email-steven.sistare@oracle.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | allow cpr-reboot for vfio | expand |
On 2/22/24 18:28, Steve Sistare wrote: > 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. > > Signed-off-by: Steve Sistare <steven.sistare@oracle.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Thanks, C. > --- > hw/vfio/common.c | 2 +- > hw/vfio/cpr.c | 20 ++++++++++++++++++++ > hw/vfio/migration.c | 2 +- > include/hw/vfio/vfio-container-base.h | 1 + > 4 files changed, 23 insertions(+), 2 deletions(-) > > diff --git a/hw/vfio/common.c b/hw/vfio/common.c > index 059bfdc..ff88c3f 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 3bede54..392c2dd 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->type == MIG_EVENT_PRECOPY_SETUP && > + !runstate_check(RUN_STATE_SUSPENDED) && !vm_get_suspended()) { > + > + error_setg(errp, > + "VFIO device only supports cpr-reboot for runstate suspended"); > + > + return -1; > + } > + return 0; > +} > > int vfio_cpr_register_container(VFIOContainerBase *bcontainer, Error **errp) > { > + migration_add_notifier_mode(&bcontainer->cpr_reboot_notifier, > + vfio_cpr_reboot_notifier, > + MIG_MODE_CPR_REBOOT); > return 0; > } > > void vfio_cpr_unregister_container(VFIOContainerBase *bcontainer) > { > + migration_remove_notifier(&bcontainer->cpr_reboot_notifier); > } > diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c > index 50140ed..2050ac8 100644 > --- a/hw/vfio/migration.c > +++ b/hw/vfio/migration.c > @@ -889,7 +889,7 @@ 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-container-base.h b/include/hw/vfio/vfio-container-base.h > index b2813b0..3582d5f 100644 > --- a/include/hw/vfio/vfio-container-base.h > +++ b/include/hw/vfio/vfio-container-base.h > @@ -49,6 +49,7 @@ typedef struct VFIOContainerBase { > QLIST_ENTRY(VFIOContainerBase) next; > QLIST_HEAD(, VFIODevice) device_list; > GList *iova_ranges; > + NotifierWithReturn cpr_reboot_notifier; > } VFIOContainerBase; > > typedef struct VFIOGuestIOMMU {
diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 059bfdc..ff88c3f 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 3bede54..392c2dd 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->type == MIG_EVENT_PRECOPY_SETUP && + !runstate_check(RUN_STATE_SUSPENDED) && !vm_get_suspended()) { + + error_setg(errp, + "VFIO device only supports cpr-reboot for runstate suspended"); + + return -1; + } + return 0; +} int vfio_cpr_register_container(VFIOContainerBase *bcontainer, Error **errp) { + migration_add_notifier_mode(&bcontainer->cpr_reboot_notifier, + vfio_cpr_reboot_notifier, + MIG_MODE_CPR_REBOOT); return 0; } void vfio_cpr_unregister_container(VFIOContainerBase *bcontainer) { + migration_remove_notifier(&bcontainer->cpr_reboot_notifier); } diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index 50140ed..2050ac8 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -889,7 +889,7 @@ 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-container-base.h b/include/hw/vfio/vfio-container-base.h index b2813b0..3582d5f 100644 --- a/include/hw/vfio/vfio-container-base.h +++ b/include/hw/vfio/vfio-container-base.h @@ -49,6 +49,7 @@ typedef struct VFIOContainerBase { QLIST_ENTRY(VFIOContainerBase) next; QLIST_HEAD(, VFIODevice) device_list; GList *iova_ranges; + NotifierWithReturn cpr_reboot_notifier; } VFIOContainerBase; typedef struct VFIOGuestIOMMU {
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. Signed-off-by: Steve Sistare <steven.sistare@oracle.com> --- hw/vfio/common.c | 2 +- hw/vfio/cpr.c | 20 ++++++++++++++++++++ hw/vfio/migration.c | 2 +- include/hw/vfio/vfio-container-base.h | 1 + 4 files changed, 23 insertions(+), 2 deletions(-)