| Message ID | 20230831125702.11263-4-avihaih@nvidia.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | vfio/migration: Block VFIO migration with postcopy and background snapshot | expand |
On Thu, Aug 31, 2023 at 03:57:00PM +0300, Avihai Horon wrote: > Add a new .save_prepare() handler to struct SaveVMHandlers. This handler > is called early, even before migration starts, and can be used by > devices to perform early checks. > > Suggested-by: Peter Xu <peterx@redhat.com> > Signed-off-by: Avihai Horon <avihaih@nvidia.com> Shouldn't be hard to unify the two call sites for qmp migrate and save snapshot, but we can leave that for later: Reviewed-by: Peter Xu <peterx@redhat.com> Thanks,
On 9/1/23 17:49, Peter Xu wrote: > On Thu, Aug 31, 2023 at 03:57:00PM +0300, Avihai Horon wrote: >> Add a new .save_prepare() handler to struct SaveVMHandlers. This handler >> is called early, even before migration starts, and can be used by >> devices to perform early checks. >> >> Suggested-by: Peter Xu <peterx@redhat.com> >> Signed-off-by: Avihai Horon <avihaih@nvidia.com> > > Shouldn't be hard to unify the two call sites for qmp migrate and save > snapshot, but we can leave that for later: yes. It could be called from migrate_init() with minor changes. We could probably move : memset(&mig_stats, 0, sizeof(mig_stats)); memset(&compression_counters, 0, sizeof(compression_counters)); migration_reset_vfio_bytes_transferred(); under migrate_init() also. Anyhow, Reviewed-by: Cédric Le Goater <clg@redhat.com> Thanks, C.
On 05/09/2023 19:13, Cédric Le Goater wrote: > External email: Use caution opening links or attachments > > > On 9/1/23 17:49, Peter Xu wrote: >> On Thu, Aug 31, 2023 at 03:57:00PM +0300, Avihai Horon wrote: >>> Add a new .save_prepare() handler to struct SaveVMHandlers. This >>> handler >>> is called early, even before migration starts, and can be used by >>> devices to perform early checks. >>> >>> Suggested-by: Peter Xu <peterx@redhat.com> >>> Signed-off-by: Avihai Horon <avihaih@nvidia.com> >> >> Shouldn't be hard to unify the two call sites for qmp migrate and save >> snapshot, but we can leave that for later: > > yes. It could be called from migrate_init() with minor changes. > > We could probably move : > > memset(&mig_stats, 0, sizeof(mig_stats)); > memset(&compression_counters, 0, sizeof(compression_counters)); > migration_reset_vfio_bytes_transferred(); > > under migrate_init() also. I will send v3 with the above changes shortly. Thanks. > Anyhow, > > Reviewed-by: Cédric Le Goater <clg@redhat.com> > > Thanks, > > C. >
On 9/6/23 16:11, Avihai Horon wrote: > > On 05/09/2023 19:13, Cédric Le Goater wrote: >> External email: Use caution opening links or attachments >> >> >> On 9/1/23 17:49, Peter Xu wrote: >>> On Thu, Aug 31, 2023 at 03:57:00PM +0300, Avihai Horon wrote: >>>> Add a new .save_prepare() handler to struct SaveVMHandlers. This handler >>>> is called early, even before migration starts, and can be used by >>>> devices to perform early checks. >>>> >>>> Suggested-by: Peter Xu <peterx@redhat.com> >>>> Signed-off-by: Avihai Horon <avihaih@nvidia.com> >>> >>> Shouldn't be hard to unify the two call sites for qmp migrate and save >>> snapshot, but we can leave that for later: >> >> yes. It could be called from migrate_init() with minor changes. >> >> We could probably move : >> >> memset(&mig_stats, 0, sizeof(mig_stats)); >> memset(&compression_counters, 0, sizeof(compression_counters)); >> migration_reset_vfio_bytes_transferred(); >> >> under migrate_init() also. > > I will send v3 with the above changes shortly. Good timing. I was going to start working on downstream. Thanks ! C.
diff --git a/include/migration/register.h b/include/migration/register.h index 90914f32f5..2b12c6adec 100644 --- a/include/migration/register.h +++ b/include/migration/register.h @@ -20,6 +20,11 @@ typedef struct SaveVMHandlers { /* This runs inside the iothread lock. */ SaveStateHandler *save_state; + /* + * save_prepare is called early, even before migration starts, and can be + * used to perform early checks. + */ + int (*save_prepare)(void *opaque, Error **errp); void (*save_cleanup)(void *opaque); int (*save_live_complete_postcopy)(QEMUFile *f, void *opaque); int (*save_live_complete_precopy)(QEMUFile *f, void *opaque); diff --git a/migration/savevm.h b/migration/savevm.h index e894bbc143..74669733dd 100644 --- a/migration/savevm.h +++ b/migration/savevm.h @@ -31,6 +31,7 @@ bool qemu_savevm_state_blocked(Error **errp); void qemu_savevm_non_migratable_list(strList **reasons); +int qemu_savevm_state_prepare(Error **errp); void qemu_savevm_state_setup(QEMUFile *f); bool qemu_savevm_state_guest_unplug_pending(void); int qemu_savevm_state_resume_prepare(MigrationState *s); diff --git a/migration/migration.c b/migration/migration.c index 92866a8f49..914783f07b 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -1634,6 +1634,10 @@ static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc, migrate_set_block_incremental(true); } + if (qemu_savevm_state_prepare(errp)) { + return false; + } + migrate_init(s); /* * set mig_stats compression_counters memory to zero for a diff --git a/migration/savevm.c b/migration/savevm.c index 5bf8b59a7d..818510ec57 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -1233,6 +1233,30 @@ bool qemu_savevm_state_guest_unplug_pending(void) return false; } +int qemu_savevm_state_prepare(Error **errp) +{ + SaveStateEntry *se; + int ret; + + QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { + if (!se->ops || !se->ops->save_prepare) { + continue; + } + if (se->ops->is_active) { + if (!se->ops->is_active(se->opaque)) { + continue; + } + } + + ret = se->ops->save_prepare(se->opaque, errp); + if (ret < 0) { + return ret; + } + } + + return 0; +} + void qemu_savevm_state_setup(QEMUFile *f) { MigrationState *ms = migrate_get_current(); @@ -1619,6 +1643,11 @@ static int qemu_savevm_state(QEMUFile *f, Error **errp) return -EINVAL; } + ret = qemu_savevm_state_prepare(errp); + if (ret) { + return ret; + } + migrate_init(ms); memset(&mig_stats, 0, sizeof(mig_stats)); memset(&compression_counters, 0, sizeof(compression_counters));
Add a new .save_prepare() handler to struct SaveVMHandlers. This handler is called early, even before migration starts, and can be used by devices to perform early checks. Suggested-by: Peter Xu <peterx@redhat.com> Signed-off-by: Avihai Horon <avihaih@nvidia.com> --- include/migration/register.h | 5 +++++ migration/savevm.h | 1 + migration/migration.c | 4 ++++ migration/savevm.c | 29 +++++++++++++++++++++++++++++ 4 files changed, 39 insertions(+)