| Message ID | 20240506092053.388578-5-clg@redhat.com |
|---|---|
| State | New |
| Headers | show |
| Series | vfio: Improve error reporting (part 2) | expand |
On 06/05/2024 12:20, Cédric Le Goater wrote: > External email: Use caution opening links or attachments Nit: change commit title prefix to vfio/migration (also in other patches that are closely related to vfio migration) Plus, maybe change subject to "Add an Error** argument to vfio_migration_set_state() and adjust callers" as it's the main subject of the patch? > > Add an Error** argument to vfio_migration_set_state() and adjust > callers, including vfio_save_setup(). The error will be propagated up > to qemu_savevm_state_setup() where the save_setup() handler is > executed. > > Modify vfio_vmstate_change_prepare() and vfio_vmstate_change() to > store a reported error under the migration stream if a migration is in > progress. > > Signed-off-by: Cédric Le Goater <clg@redhat.com> > --- > > Changes in v5: > > - Replaced error_setg() by error_setg_errno() in vfio_migration_set_state() > - Rebased on 20c64c8a51a4 ("migration: migration_file_set_error") > > hw/vfio/migration.c | 76 +++++++++++++++++++++++++-------------------- > 1 file changed, 43 insertions(+), 33 deletions(-) > > diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c > index bf2fd0759ba6e4fb103cc5c1a43edb180a3d0de4..9b6375c949f7a8dca857ead2506855f63fa051e4 100644 > --- a/hw/vfio/migration.c > +++ b/hw/vfio/migration.c > @@ -82,7 +82,8 @@ static const char *mig_state_to_str(enum vfio_device_mig_state state) > > static int vfio_migration_set_state(VFIODevice *vbasedev, > enum vfio_device_mig_state new_state, > - enum vfio_device_mig_state recover_state) > + enum vfio_device_mig_state recover_state, > + Error **errp) > { > VFIOMigration *migration = vbasedev->migration; > uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature) + > @@ -102,25 +103,26 @@ static int vfio_migration_set_state(VFIODevice *vbasedev, > ret = -errno; > > if (recover_state == VFIO_DEVICE_STATE_ERROR) { > - error_report("%s: Failed setting device state to %s, err: %s. " > - "Recover state is ERROR. Resetting device", > - vbasedev->name, mig_state_to_str(new_state), > - strerror(errno)); > + error_setg_errno(errp, errno, > + "%s: Failed setting device state to %s. " > + "Recover state is ERROR. Resetting device", > + vbasedev->name, mig_state_to_str(new_state)); > > goto reset_device; > } > > - error_report( > - "%s: Failed setting device state to %s, err: %s. Setting device in recover state %s", > - vbasedev->name, mig_state_to_str(new_state), > - strerror(errno), mig_state_to_str(recover_state)); > + error_setg_errno(errp, errno, > + "%s: Failed setting device state to %s. " > + "Setting device in recover state %s", > + vbasedev->name, mig_state_to_str(new_state), > + mig_state_to_str(recover_state)); > > mig_state->device_state = recover_state; > if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) { > ret = -errno; > - error_report( > - "%s: Failed setting device in recover state, err: %s. Resetting device", > - vbasedev->name, strerror(errno)); > + error_setg_errno(errp, errno, > + "%s: Failed setting device in recover state. " > + "Resetting device", vbasedev->name); Here we set errp again when it's already set. Maybe in this case just: error_report_err(*errp); *errp = NULL; error_setg_errno(errp, errno, "%s: Failed setting device in recover state. " "Resetting device", vbasedev->name); ? > > goto reset_device; > } > @@ -137,7 +139,7 @@ static int vfio_migration_set_state(VFIODevice *vbasedev, > * This can happen if the device is asynchronously reset and > * terminates a data transfer. > */ > - error_report("%s: data_fd out of sync", vbasedev->name); > + error_setg(errp, "%s: data_fd out of sync", vbasedev->name); > close(mig_state->data_fd); > > return -EBADF; > @@ -168,10 +170,11 @@ reset_device: > */ > static int > vfio_migration_set_state_or_reset(VFIODevice *vbasedev, > - enum vfio_device_mig_state new_state) > + enum vfio_device_mig_state new_state, > + Error **errp) > { > return vfio_migration_set_state(vbasedev, new_state, > - VFIO_DEVICE_STATE_ERROR); > + VFIO_DEVICE_STATE_ERROR, errp); > } > > static int vfio_load_buffer(QEMUFile *f, VFIODevice *vbasedev, > @@ -399,10 +402,8 @@ static int vfio_save_setup(QEMUFile *f, void *opaque, Error **errp) > switch (migration->device_state) { > case VFIO_DEVICE_STATE_RUNNING: > ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_PRE_COPY, > - VFIO_DEVICE_STATE_RUNNING); > + VFIO_DEVICE_STATE_RUNNING, errp); > if (ret) { > - error_setg(errp, "%s: Failed to set new PRE_COPY state", > - vbasedev->name); > return ret; > } > > @@ -435,13 +436,20 @@ static void vfio_save_cleanup(void *opaque) > { > VFIODevice *vbasedev = opaque; > VFIOMigration *migration = vbasedev->migration; > + Error *local_err = NULL; > + int ret; > > /* > * Changing device state from STOP_COPY to STOP can take time. Do it here, > * after migration has completed, so it won't increase downtime. > */ > if (migration->device_state == VFIO_DEVICE_STATE_STOP_COPY) { > - vfio_migration_set_state_or_reset(vbasedev, VFIO_DEVICE_STATE_STOP); > + ret = vfio_migration_set_state_or_reset(vbasedev, > + VFIO_DEVICE_STATE_STOP, > + &local_err); > + if (ret) { > + error_report_err(local_err); > + } > } > > g_free(migration->data_buffer); > @@ -549,11 +557,13 @@ static int vfio_save_complete_precopy(QEMUFile *f, void *opaque) > VFIODevice *vbasedev = opaque; > ssize_t data_size; > int ret; > + Error *local_err = NULL; > > /* We reach here with device state STOP or STOP_COPY only */ > ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_STOP_COPY, > - VFIO_DEVICE_STATE_STOP); > + VFIO_DEVICE_STATE_STOP, &local_err); > if (ret) { > + error_report_err(local_err); > return ret; > } > > @@ -591,14 +601,9 @@ static void vfio_save_state(QEMUFile *f, void *opaque) > static int vfio_load_setup(QEMUFile *f, void *opaque, Error **errp) > { > VFIODevice *vbasedev = opaque; > - int ret; > > - ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RESUMING, > - vbasedev->migration->device_state); > - if (ret) { > - error_setg(errp, "%s: Failed to set RESUMING state", vbasedev->name); > - } > - return ret; > + return vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RESUMING, > + vbasedev->migration->device_state, errp); > } > > static int vfio_load_cleanup(void *opaque) > @@ -714,19 +719,20 @@ static void vfio_vmstate_change_prepare(void *opaque, bool running, > VFIODevice *vbasedev = opaque; > VFIOMigration *migration = vbasedev->migration; > enum vfio_device_mig_state new_state; > + Error *local_err = NULL; > int ret; > > new_state = migration->device_state == VFIO_DEVICE_STATE_PRE_COPY ? > VFIO_DEVICE_STATE_PRE_COPY_P2P : > VFIO_DEVICE_STATE_RUNNING_P2P; > > - ret = vfio_migration_set_state_or_reset(vbasedev, new_state); > + ret = vfio_migration_set_state_or_reset(vbasedev, new_state, &local_err); > if (ret) { > /* > * Migration should be aborted in this case, but vm_state_notify() > * currently does not support reporting failures. > */ > - migration_file_set_error(ret, NULL); > + migration_file_set_error(ret, local_err); > } > > trace_vfio_vmstate_change_prepare(vbasedev->name, running, > @@ -738,6 +744,7 @@ static void vfio_vmstate_change(void *opaque, bool running, RunState state) > { > VFIODevice *vbasedev = opaque; > enum vfio_device_mig_state new_state; > + Error *local_err = NULL; > int ret; > > if (running) { > @@ -750,13 +757,13 @@ static void vfio_vmstate_change(void *opaque, bool running, RunState state) > VFIO_DEVICE_STATE_STOP; > } > > - ret = vfio_migration_set_state_or_reset(vbasedev, new_state); > + ret = vfio_migration_set_state_or_reset(vbasedev, new_state, &local_err); > if (ret) { > /* > * Migration should be aborted in this case, but vm_state_notify() > * currently does not support reporting failures. > */ > - migration_file_set_error(ret, NULL); > + migration_file_set_error(ret, local_err); > } > > trace_vfio_vmstate_change(vbasedev->name, running, RunState_str(state), > @@ -769,13 +776,16 @@ static int vfio_migration_state_notifier(NotifierWithReturn *notifier, > VFIOMigration *migration = container_of(notifier, VFIOMigration, > migration_state); > VFIODevice *vbasedev = migration->vbasedev; > + int ret = 0; > > trace_vfio_migration_state_notifier(vbasedev->name, e->type); > > if (e->type == MIG_EVENT_PRECOPY_FAILED) { > - vfio_migration_set_state_or_reset(vbasedev, VFIO_DEVICE_STATE_RUNNING); > + ret = vfio_migration_set_state_or_reset(vbasedev, > + VFIO_DEVICE_STATE_RUNNING, > + errp); > } > - return 0; > + return ret; In MigrationNotifyFunc declaration it's stated that: /* * A MigrationNotifyFunc may return an error code and an Error object, * but only when @e->type is MIG_EVENT_PRECOPY_SETUP. The code is an int * to allow for different failure modes and recovery actions. */ And indeed migration_call_notifiers() will assert if this notifier fails on MIG_EVENT_PRECOPY_FAILED. So I guess we should simply report the error locally and return 0. Thanks. > } > > static void vfio_migration_free(VFIODevice *vbasedev) > -- > 2.45.0 >
On 5/13/24 15:21, Avihai Horon wrote: > > On 06/05/2024 12:20, Cédric Le Goater wrote: >> External email: Use caution opening links or attachments > > Nit: change commit title prefix to vfio/migration (also in other patches that are closely related to vfio migration) > > Plus, maybe change subject to "Add an Error** argument to vfio_migration_set_state() and adjust callers" as it's the main subject of the patch? > >> >> Add an Error** argument to vfio_migration_set_state() and adjust >> callers, including vfio_save_setup(). The error will be propagated up >> to qemu_savevm_state_setup() where the save_setup() handler is >> executed. >> >> Modify vfio_vmstate_change_prepare() and vfio_vmstate_change() to >> store a reported error under the migration stream if a migration is in >> progress. >> >> Signed-off-by: Cédric Le Goater <clg@redhat.com> >> --- >> >> Changes in v5: >> >> - Replaced error_setg() by error_setg_errno() in vfio_migration_set_state() >> - Rebased on 20c64c8a51a4 ("migration: migration_file_set_error") >> >> hw/vfio/migration.c | 76 +++++++++++++++++++++++++-------------------- >> 1 file changed, 43 insertions(+), 33 deletions(-) >> >> diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c >> index bf2fd0759ba6e4fb103cc5c1a43edb180a3d0de4..9b6375c949f7a8dca857ead2506855f63fa051e4 100644 >> --- a/hw/vfio/migration.c >> +++ b/hw/vfio/migration.c >> @@ -82,7 +82,8 @@ static const char *mig_state_to_str(enum vfio_device_mig_state state) >> >> static int vfio_migration_set_state(VFIODevice *vbasedev, >> enum vfio_device_mig_state new_state, >> - enum vfio_device_mig_state recover_state) >> + enum vfio_device_mig_state recover_state, >> + Error **errp) >> { >> VFIOMigration *migration = vbasedev->migration; >> uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature) + >> @@ -102,25 +103,26 @@ static int vfio_migration_set_state(VFIODevice *vbasedev, >> ret = -errno; >> >> if (recover_state == VFIO_DEVICE_STATE_ERROR) { >> - error_report("%s: Failed setting device state to %s, err: %s. " >> - "Recover state is ERROR. Resetting device", >> - vbasedev->name, mig_state_to_str(new_state), >> - strerror(errno)); >> + error_setg_errno(errp, errno, >> + "%s: Failed setting device state to %s. " >> + "Recover state is ERROR. Resetting device", >> + vbasedev->name, mig_state_to_str(new_state)); >> >> goto reset_device; >> } >> >> - error_report( >> - "%s: Failed setting device state to %s, err: %s. Setting device in recover state %s", >> - vbasedev->name, mig_state_to_str(new_state), >> - strerror(errno), mig_state_to_str(recover_state)); >> + error_setg_errno(errp, errno, >> + "%s: Failed setting device state to %s. " >> + "Setting device in recover state %s", >> + vbasedev->name, mig_state_to_str(new_state), >> + mig_state_to_str(recover_state)); >> >> mig_state->device_state = recover_state; >> if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) { >> ret = -errno; >> - error_report( >> - "%s: Failed setting device in recover state, err: %s. Resetting device", >> - vbasedev->name, strerror(errno)); >> + error_setg_errno(errp, errno, >> + "%s: Failed setting device in recover state. " >> + "Resetting device", vbasedev->name); > > Here we set errp again when it's already set. yes. > Maybe in this case just: > > error_report_err(*errp); > *errp = NULL; > error_setg_errno(errp, errno, > "%s: Failed setting device in recover state. " > "Resetting device", vbasedev->name); > ? I see two alternatives for the recover state error : 1. append to the existing one, but we lack an error_append() helper 2. report as done today. I tend to prefer 2. and we cab come back to 1. later on. > >> >> goto reset_device; >> } >> @@ -137,7 +139,7 @@ static int vfio_migration_set_state(VFIODevice *vbasedev, >> * This can happen if the device is asynchronously reset and >> * terminates a data transfer. >> */ >> - error_report("%s: data_fd out of sync", vbasedev->name); >> + error_setg(errp, "%s: data_fd out of sync", vbasedev->name); >> close(mig_state->data_fd); >> >> return -EBADF; >> @@ -168,10 +170,11 @@ reset_device: >> */ >> static int >> vfio_migration_set_state_or_reset(VFIODevice *vbasedev, >> - enum vfio_device_mig_state new_state) >> + enum vfio_device_mig_state new_state, >> + Error **errp) >> { >> return vfio_migration_set_state(vbasedev, new_state, >> - VFIO_DEVICE_STATE_ERROR); >> + VFIO_DEVICE_STATE_ERROR, errp); >> } >> >> static int vfio_load_buffer(QEMUFile *f, VFIODevice *vbasedev, >> @@ -399,10 +402,8 @@ static int vfio_save_setup(QEMUFile *f, void *opaque, Error **errp) >> switch (migration->device_state) { >> case VFIO_DEVICE_STATE_RUNNING: >> ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_PRE_COPY, >> - VFIO_DEVICE_STATE_RUNNING); >> + VFIO_DEVICE_STATE_RUNNING, errp); >> if (ret) { >> - error_setg(errp, "%s: Failed to set new PRE_COPY state", >> - vbasedev->name); >> return ret; >> } >> >> @@ -435,13 +436,20 @@ static void vfio_save_cleanup(void *opaque) >> { >> VFIODevice *vbasedev = opaque; >> VFIOMigration *migration = vbasedev->migration; >> + Error *local_err = NULL; >> + int ret; >> >> /* >> * Changing device state from STOP_COPY to STOP can take time. Do it here, >> * after migration has completed, so it won't increase downtime. >> */ >> if (migration->device_state == VFIO_DEVICE_STATE_STOP_COPY) { >> - vfio_migration_set_state_or_reset(vbasedev, VFIO_DEVICE_STATE_STOP); >> + ret = vfio_migration_set_state_or_reset(vbasedev, >> + VFIO_DEVICE_STATE_STOP, >> + &local_err); >> + if (ret) { >> + error_report_err(local_err); >> + } >> } >> >> g_free(migration->data_buffer); >> @@ -549,11 +557,13 @@ static int vfio_save_complete_precopy(QEMUFile *f, void *opaque) >> VFIODevice *vbasedev = opaque; >> ssize_t data_size; >> int ret; >> + Error *local_err = NULL; >> >> /* We reach here with device state STOP or STOP_COPY only */ >> ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_STOP_COPY, >> - VFIO_DEVICE_STATE_STOP); >> + VFIO_DEVICE_STATE_STOP, &local_err); >> if (ret) { >> + error_report_err(local_err); >> return ret; >> } >> >> @@ -591,14 +601,9 @@ static void vfio_save_state(QEMUFile *f, void *opaque) >> static int vfio_load_setup(QEMUFile *f, void *opaque, Error **errp) >> { >> VFIODevice *vbasedev = opaque; >> - int ret; >> >> - ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RESUMING, >> - vbasedev->migration->device_state); >> - if (ret) { >> - error_setg(errp, "%s: Failed to set RESUMING state", vbasedev->name); >> - } >> - return ret; >> + return vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RESUMING, >> + vbasedev->migration->device_state, errp); >> } >> >> static int vfio_load_cleanup(void *opaque) >> @@ -714,19 +719,20 @@ static void vfio_vmstate_change_prepare(void *opaque, bool running, >> VFIODevice *vbasedev = opaque; >> VFIOMigration *migration = vbasedev->migration; >> enum vfio_device_mig_state new_state; >> + Error *local_err = NULL; >> int ret; >> >> new_state = migration->device_state == VFIO_DEVICE_STATE_PRE_COPY ? >> VFIO_DEVICE_STATE_PRE_COPY_P2P : >> VFIO_DEVICE_STATE_RUNNING_P2P; >> >> - ret = vfio_migration_set_state_or_reset(vbasedev, new_state); >> + ret = vfio_migration_set_state_or_reset(vbasedev, new_state, &local_err); >> if (ret) { >> /* >> * Migration should be aborted in this case, but vm_state_notify() >> * currently does not support reporting failures. >> */ >> - migration_file_set_error(ret, NULL); >> + migration_file_set_error(ret, local_err); >> } >> >> trace_vfio_vmstate_change_prepare(vbasedev->name, running, >> @@ -738,6 +744,7 @@ static void vfio_vmstate_change(void *opaque, bool running, RunState state) >> { >> VFIODevice *vbasedev = opaque; >> enum vfio_device_mig_state new_state; >> + Error *local_err = NULL; >> int ret; >> >> if (running) { >> @@ -750,13 +757,13 @@ static void vfio_vmstate_change(void *opaque, bool running, RunState state) >> VFIO_DEVICE_STATE_STOP; >> } >> >> - ret = vfio_migration_set_state_or_reset(vbasedev, new_state); >> + ret = vfio_migration_set_state_or_reset(vbasedev, new_state, &local_err); >> if (ret) { >> /* >> * Migration should be aborted in this case, but vm_state_notify() >> * currently does not support reporting failures. >> */ >> - migration_file_set_error(ret, NULL); >> + migration_file_set_error(ret, local_err); >> } >> >> trace_vfio_vmstate_change(vbasedev->name, running, RunState_str(state), >> @@ -769,13 +776,16 @@ static int vfio_migration_state_notifier(NotifierWithReturn *notifier, >> VFIOMigration *migration = container_of(notifier, VFIOMigration, >> migration_state); >> VFIODevice *vbasedev = migration->vbasedev; >> + int ret = 0; >> >> trace_vfio_migration_state_notifier(vbasedev->name, e->type); >> >> if (e->type == MIG_EVENT_PRECOPY_FAILED) { >> - vfio_migration_set_state_or_reset(vbasedev, VFIO_DEVICE_STATE_RUNNING); >> + ret = vfio_migration_set_state_or_reset(vbasedev, >> + VFIO_DEVICE_STATE_RUNNING, >> + errp); >> } >> - return 0; >> + return ret; > > In MigrationNotifyFunc declaration it's stated that: > > /* > * A MigrationNotifyFunc may return an error code and an Error object, > * but only when @e->type is MIG_EVENT_PRECOPY_SETUP. The code is an int > * to allow for different failure modes and recovery actions. > */ > > And indeed migration_call_notifiers() will assert if this notifier fails on MIG_EVENT_PRECOPY_FAILED. My series has been out of tree for too long :/ > So I guess we should simply report the error locally and return 0. yes. That said, I don't see why migrate_fd_cleanup() or postcopy_start() could not use a local_err and report the error themselves. For later. I will add a comment though. Thanks, C. > > Thanks. > >> } >> >> static void vfio_migration_free(VFIODevice *vbasedev) >> -- >> 2.45.0 >> >
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index bf2fd0759ba6e4fb103cc5c1a43edb180a3d0de4..9b6375c949f7a8dca857ead2506855f63fa051e4 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -82,7 +82,8 @@ static const char *mig_state_to_str(enum vfio_device_mig_state state) static int vfio_migration_set_state(VFIODevice *vbasedev, enum vfio_device_mig_state new_state, - enum vfio_device_mig_state recover_state) + enum vfio_device_mig_state recover_state, + Error **errp) { VFIOMigration *migration = vbasedev->migration; uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature) + @@ -102,25 +103,26 @@ static int vfio_migration_set_state(VFIODevice *vbasedev, ret = -errno; if (recover_state == VFIO_DEVICE_STATE_ERROR) { - error_report("%s: Failed setting device state to %s, err: %s. " - "Recover state is ERROR. Resetting device", - vbasedev->name, mig_state_to_str(new_state), - strerror(errno)); + error_setg_errno(errp, errno, + "%s: Failed setting device state to %s. " + "Recover state is ERROR. Resetting device", + vbasedev->name, mig_state_to_str(new_state)); goto reset_device; } - error_report( - "%s: Failed setting device state to %s, err: %s. Setting device in recover state %s", - vbasedev->name, mig_state_to_str(new_state), - strerror(errno), mig_state_to_str(recover_state)); + error_setg_errno(errp, errno, + "%s: Failed setting device state to %s. " + "Setting device in recover state %s", + vbasedev->name, mig_state_to_str(new_state), + mig_state_to_str(recover_state)); mig_state->device_state = recover_state; if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) { ret = -errno; - error_report( - "%s: Failed setting device in recover state, err: %s. Resetting device", - vbasedev->name, strerror(errno)); + error_setg_errno(errp, errno, + "%s: Failed setting device in recover state. " + "Resetting device", vbasedev->name); goto reset_device; } @@ -137,7 +139,7 @@ static int vfio_migration_set_state(VFIODevice *vbasedev, * This can happen if the device is asynchronously reset and * terminates a data transfer. */ - error_report("%s: data_fd out of sync", vbasedev->name); + error_setg(errp, "%s: data_fd out of sync", vbasedev->name); close(mig_state->data_fd); return -EBADF; @@ -168,10 +170,11 @@ reset_device: */ static int vfio_migration_set_state_or_reset(VFIODevice *vbasedev, - enum vfio_device_mig_state new_state) + enum vfio_device_mig_state new_state, + Error **errp) { return vfio_migration_set_state(vbasedev, new_state, - VFIO_DEVICE_STATE_ERROR); + VFIO_DEVICE_STATE_ERROR, errp); } static int vfio_load_buffer(QEMUFile *f, VFIODevice *vbasedev, @@ -399,10 +402,8 @@ static int vfio_save_setup(QEMUFile *f, void *opaque, Error **errp) switch (migration->device_state) { case VFIO_DEVICE_STATE_RUNNING: ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_PRE_COPY, - VFIO_DEVICE_STATE_RUNNING); + VFIO_DEVICE_STATE_RUNNING, errp); if (ret) { - error_setg(errp, "%s: Failed to set new PRE_COPY state", - vbasedev->name); return ret; } @@ -435,13 +436,20 @@ static void vfio_save_cleanup(void *opaque) { VFIODevice *vbasedev = opaque; VFIOMigration *migration = vbasedev->migration; + Error *local_err = NULL; + int ret; /* * Changing device state from STOP_COPY to STOP can take time. Do it here, * after migration has completed, so it won't increase downtime. */ if (migration->device_state == VFIO_DEVICE_STATE_STOP_COPY) { - vfio_migration_set_state_or_reset(vbasedev, VFIO_DEVICE_STATE_STOP); + ret = vfio_migration_set_state_or_reset(vbasedev, + VFIO_DEVICE_STATE_STOP, + &local_err); + if (ret) { + error_report_err(local_err); + } } g_free(migration->data_buffer); @@ -549,11 +557,13 @@ static int vfio_save_complete_precopy(QEMUFile *f, void *opaque) VFIODevice *vbasedev = opaque; ssize_t data_size; int ret; + Error *local_err = NULL; /* We reach here with device state STOP or STOP_COPY only */ ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_STOP_COPY, - VFIO_DEVICE_STATE_STOP); + VFIO_DEVICE_STATE_STOP, &local_err); if (ret) { + error_report_err(local_err); return ret; } @@ -591,14 +601,9 @@ static void vfio_save_state(QEMUFile *f, void *opaque) static int vfio_load_setup(QEMUFile *f, void *opaque, Error **errp) { VFIODevice *vbasedev = opaque; - int ret; - ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RESUMING, - vbasedev->migration->device_state); - if (ret) { - error_setg(errp, "%s: Failed to set RESUMING state", vbasedev->name); - } - return ret; + return vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RESUMING, + vbasedev->migration->device_state, errp); } static int vfio_load_cleanup(void *opaque) @@ -714,19 +719,20 @@ static void vfio_vmstate_change_prepare(void *opaque, bool running, VFIODevice *vbasedev = opaque; VFIOMigration *migration = vbasedev->migration; enum vfio_device_mig_state new_state; + Error *local_err = NULL; int ret; new_state = migration->device_state == VFIO_DEVICE_STATE_PRE_COPY ? VFIO_DEVICE_STATE_PRE_COPY_P2P : VFIO_DEVICE_STATE_RUNNING_P2P; - ret = vfio_migration_set_state_or_reset(vbasedev, new_state); + ret = vfio_migration_set_state_or_reset(vbasedev, new_state, &local_err); if (ret) { /* * Migration should be aborted in this case, but vm_state_notify() * currently does not support reporting failures. */ - migration_file_set_error(ret, NULL); + migration_file_set_error(ret, local_err); } trace_vfio_vmstate_change_prepare(vbasedev->name, running, @@ -738,6 +744,7 @@ static void vfio_vmstate_change(void *opaque, bool running, RunState state) { VFIODevice *vbasedev = opaque; enum vfio_device_mig_state new_state; + Error *local_err = NULL; int ret; if (running) { @@ -750,13 +757,13 @@ static void vfio_vmstate_change(void *opaque, bool running, RunState state) VFIO_DEVICE_STATE_STOP; } - ret = vfio_migration_set_state_or_reset(vbasedev, new_state); + ret = vfio_migration_set_state_or_reset(vbasedev, new_state, &local_err); if (ret) { /* * Migration should be aborted in this case, but vm_state_notify() * currently does not support reporting failures. */ - migration_file_set_error(ret, NULL); + migration_file_set_error(ret, local_err); } trace_vfio_vmstate_change(vbasedev->name, running, RunState_str(state), @@ -769,13 +776,16 @@ static int vfio_migration_state_notifier(NotifierWithReturn *notifier, VFIOMigration *migration = container_of(notifier, VFIOMigration, migration_state); VFIODevice *vbasedev = migration->vbasedev; + int ret = 0; trace_vfio_migration_state_notifier(vbasedev->name, e->type); if (e->type == MIG_EVENT_PRECOPY_FAILED) { - vfio_migration_set_state_or_reset(vbasedev, VFIO_DEVICE_STATE_RUNNING); + ret = vfio_migration_set_state_or_reset(vbasedev, + VFIO_DEVICE_STATE_RUNNING, + errp); } - return 0; + return ret; } static void vfio_migration_free(VFIODevice *vbasedev)
Add an Error** argument to vfio_migration_set_state() and adjust callers, including vfio_save_setup(). The error will be propagated up to qemu_savevm_state_setup() where the save_setup() handler is executed. Modify vfio_vmstate_change_prepare() and vfio_vmstate_change() to store a reported error under the migration stream if a migration is in progress. Signed-off-by: Cédric Le Goater <clg@redhat.com> --- Changes in v5: - Replaced error_setg() by error_setg_errno() in vfio_migration_set_state() - Rebased on 20c64c8a51a4 ("migration: migration_file_set_error") hw/vfio/migration.c | 76 +++++++++++++++++++++++++-------------------- 1 file changed, 43 insertions(+), 33 deletions(-)