| Message ID | 20201027182144.3315885-25-pbonzini@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | cleanup qemu_init and make sense of command line processing | expand |
On Tue, 27 Oct 2020 14:21:39 -0400 Paolo Bonzini <pbonzini@redhat.com> wrote: > Make qemu_start_incoming_migration local to migration/migration.c. > By using the runstate instead of a separate flag, vl need not do > anything to setup deferred incoming migration. > > qmp_migrate_incoming also does not need the deferred_incoming flag > anymore, because "-incoming PROTOCOL" will clear the "once" flag > before the main loop starts. Therefore, later invocations of > the migrate-incoming command will fail with the existing > "The incoming migration has already been started" error message. > > Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> > --- > include/migration/misc.h | 1 - > migration/migration.c | 33 ++++++++------------------------- > softmmu/vl.c | 11 +++++++---- > 3 files changed, 15 insertions(+), 30 deletions(-) > > diff --git a/include/migration/misc.h b/include/migration/misc.h > index 34e7d75713..bccc1b6b44 100644 > --- a/include/migration/misc.h > +++ b/include/migration/misc.h > @@ -58,7 +58,6 @@ void dump_vmstate_json_to_file(FILE *out_fp); > /* migration/migration.c */ > void migration_object_init(void); > void migration_shutdown(void); > -void qemu_start_incoming_migration(const char *uri, Error **errp); > bool migration_is_idle(void); > bool migration_is_active(MigrationState *); > void add_migration_state_change_notifier(Notifier *notify); > diff --git a/migration/migration.c b/migration/migration.c > index f48b03cac2..d078094c56 100644 > --- a/migration/migration.c > +++ b/migration/migration.c > @@ -114,8 +114,6 @@ > static NotifierList migration_state_notifiers = > NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); > > -static bool deferred_incoming; > - > /* Messages sent on the return path from destination to source */ > enum mig_rp_message_type { > MIG_RP_MSG_INVALID = 0, /* Must be 0 */ > @@ -257,19 +255,6 @@ static bool migrate_late_block_activate(void) > MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE]; > } > > -/* > - * Called on -incoming with a defer: uri. > - * The migration can be started later after any parameters have been > - * changed. > - */ > -static void deferred_incoming_migration(Error **errp) > -{ > - if (deferred_incoming) { > - error_setg(errp, "Incoming migration already deferred"); > - } > - deferred_incoming = true; > -} > - > /* > * Send a message on the return channel back to the source > * of the migration. > @@ -380,16 +365,14 @@ void migrate_add_address(SocketAddress *address) > addrs->value = QAPI_CLONE(SocketAddress, address); > } > > -void qemu_start_incoming_migration(const char *uri, Error **errp) > +static void qemu_start_incoming_migration(const char *uri, Error **errp) > { > const char *p = NULL; > > qapi_event_send_migration(MIGRATION_STATUS_SETUP); > - if (!strcmp(uri, "defer")) { > - deferred_incoming_migration(errp); > - } else if (strstart(uri, "tcp:", &p) || > - strstart(uri, "unix:", NULL) || > - strstart(uri, "vsock:", NULL)) { considering the last hunk does won't call qmp_migrate_incoming if 'defer' was used, wouldn't we will lose QAPI event here? not sure how important it to users, Ccing David > + if (strstart(uri, "tcp:", &p) || > + strstart(uri, "unix:", NULL) || > + strstart(uri, "vsock:", NULL)) { > socket_start_incoming_migration(p ? p : uri, errp); > #ifdef CONFIG_RDMA > } else if (strstart(uri, "rdma:", &p)) { > @@ -1926,14 +1909,14 @@ void qmp_migrate_incoming(const char *uri, Error **errp) > Error *local_err = NULL; > static bool once = true; > > - if (!deferred_incoming) { > - error_setg(errp, "For use with '-incoming defer'"); > - return; > - } > if (!once) { > error_setg(errp, "The incoming migration has already been started"); > return; > } > + if (!runstate_check(RUN_STATE_INMIGRATE)) { > + error_setg(errp, "'-incoming' was not specified on the command line"); > + return; > + } > > qemu_start_incoming_migration(uri, &local_err); > > diff --git a/softmmu/vl.c b/softmmu/vl.c > index ae2854d8af..583366510b 100644 > --- a/softmmu/vl.c > +++ b/softmmu/vl.c > @@ -109,6 +109,7 @@ > #include "qapi/qapi-visit-block-core.h" > #include "qapi/qapi-visit-ui.h" > #include "qapi/qapi-commands-block-core.h" > +#include "qapi/qapi-commands-migration.h" > #include "qapi/qapi-commands-run-state.h" > #include "qapi/qapi-commands-ui.h" > #include "qapi/qmp/qerror.h" > @@ -4557,10 +4558,12 @@ void qemu_init(int argc, char **argv, char **envp) > } > if (incoming) { > Error *local_err = NULL; > - qemu_start_incoming_migration(incoming, &local_err); > - if (local_err) { > - error_reportf_err(local_err, "-incoming %s: ", incoming); > - exit(1); > + if (strcmp(incoming, "defer") != 0) { > + qmp_migrate_incoming(incoming, &local_err); > + if (local_err) { > + error_reportf_err(local_err, "-incoming %s: ", incoming); > + exit(1); > + } > } > } else if (autostart) { > vm_start();
On 20/11/20 16:34, Igor Mammedov wrote: >> qapi_event_send_migration(MIGRATION_STATUS_SETUP); >> - if (!strcmp(uri, "defer")) { >> - deferred_incoming_migration(errp); >> - } else if (strstart(uri, "tcp:", &p) || >> - strstart(uri, "unix:", NULL) || >> - strstart(uri, "vsock:", NULL)) { > considering the last hunk does won't call qmp_migrate_incoming > if 'defer' was used, wouldn't we will lose QAPI event here? > not sure how important it to users, Hmm yeah that's true. That might even be considered a bugfix (no setup is done until the "real" migrate-incoming command), but I can also add the event manually in qemu_init. (Libvirt doesn't use the SETUP case of the event but that's of course only part of the story). Paolo
* Paolo Bonzini (pbonzini@redhat.com) wrote: > On 20/11/20 16:34, Igor Mammedov wrote: > > > qapi_event_send_migration(MIGRATION_STATUS_SETUP); > > > - if (!strcmp(uri, "defer")) { > > > - deferred_incoming_migration(errp); > > > - } else if (strstart(uri, "tcp:", &p) || > > > - strstart(uri, "unix:", NULL) || > > > - strstart(uri, "vsock:", NULL)) { > > considering the last hunk does won't call qmp_migrate_incoming > > if 'defer' was used, wouldn't we will lose QAPI event here? > > not sure how important it to users, > > Hmm yeah that's true. That might even be considered a bugfix (no setup is > done until the "real" migrate-incoming command), but I can also add the > event manually in qemu_init. > > (Libvirt doesn't use the SETUP case of the event but that's of course only > part of the story). I'm more worried about how this stops a repeated 'migrate incoming' or a 'migrate_incoming' that's issued following a qemu that's been started with -incoming tcp:... but which a socket hasn't yet connected to. Dave > Paolo >
On Wed, Dec 02, 2020 at 01:10:37PM +0000, Dr. David Alan Gilbert wrote: > * Paolo Bonzini (pbonzini@redhat.com) wrote: > > On 20/11/20 16:34, Igor Mammedov wrote: > > > > qapi_event_send_migration(MIGRATION_STATUS_SETUP); > > > > - if (!strcmp(uri, "defer")) { > > > > - deferred_incoming_migration(errp); > > > > - } else if (strstart(uri, "tcp:", &p) || > > > > - strstart(uri, "unix:", NULL) || > > > > - strstart(uri, "vsock:", NULL)) { > > > considering the last hunk does won't call qmp_migrate_incoming > > > if 'defer' was used, wouldn't we will lose QAPI event here? > > > not sure how important it to users, > > > > Hmm yeah that's true. That might even be considered a bugfix (no setup is > > done until the "real" migrate-incoming command), but I can also add the > > event manually in qemu_init. > > > > (Libvirt doesn't use the SETUP case of the event but that's of course only > > part of the story). > > I'm more worried about how this stops a repeated 'migrate incoming' > or a 'migrate_incoming' that's issued following a qemu that's been > started with -incoming tcp:... but which a socket hasn't yet connected > to. Can someone remind me why we need to have an -incoming arg at all ? With snapshots, we can just start QEMU normally, using -S if desired, and then invoke "loadvm" to restore from a snapshot at any time. What is different thet means we can't just run "migrate_incoming" on any QEMU at any time, ignoring -incoming entirely ? Regards, Daniel
On 02/12/20 14:15, Daniel P. Berrangé wrote: > Can someone remind me why we need to have an -incoming arg at all ? > > With snapshots, we can just start QEMU normally, using -S if desired, > and then invoke "loadvm" to restore from a snapshot at any time. > > What is different thet means we can't just run "migrate_incoming" on > any QEMU at any time, ignoring -incoming entirely ? There are some parts of QEMU that operate differently based on RUN_STATE_INCOMING. Removing those is one of the things that these patches should enable, though there are also some uses in Xen that I'm more worried about. Paolo
On 02/12/20 14:10, Dr. David Alan Gilbert wrote: > I'm more worried about how this stops a repeated 'migrate incoming' > or a 'migrate_incoming' that's issued following a qemu that's been > started with -incoming tcp:... but which a socket hasn't yet connected > to. Good question, fortunately it is simply handled answer: void qmp_migrate_incoming(const char *uri, Error **errp) { Error *local_err = NULL; static bool once = true; if (!once) { error_setg(errp, "The incoming migration has already been started"); return; } if (!runstate_check(RUN_STATE_INMIGRATE)) { error_setg(errp, "'-incoming' was not specified on the command line"); return; } qemu_start_incoming_migration(uri, &local_err); if (local_err) { error_propagate(errp, local_err); return; } once = false; } This patch can simplify things because every incoming migrations (no matter if '-incoming defer' or '-incoming tcp:...') goes through the qmp_migrate_incoming function above. Paolo
* Paolo Bonzini (pbonzini@redhat.com) wrote: > On 02/12/20 14:10, Dr. David Alan Gilbert wrote: > > I'm more worried about how this stops a repeated 'migrate incoming' > > or a 'migrate_incoming' that's issued following a qemu that's been > > started with -incoming tcp:... but which a socket hasn't yet connected > > to. > > Good question, fortunately it is simply handled answer: > > void qmp_migrate_incoming(const char *uri, Error **errp) > { > Error *local_err = NULL; > static bool once = true; > > if (!once) { > error_setg(errp, "The incoming migration has already been started"); > return; > } > if (!runstate_check(RUN_STATE_INMIGRATE)) { > error_setg(errp, "'-incoming' was not specified on the command > line"); > return; > } > > qemu_start_incoming_migration(uri, &local_err); > > if (local_err) { > error_propagate(errp, local_err); > return; > } > > once = false; > } > > This patch can simplify things because every incoming migrations (no matter > if '-incoming defer' or '-incoming tcp:...') goes through the > qmp_migrate_incoming function above. Yeh I think that's OK. Dave > Paolo >
diff --git a/include/migration/misc.h b/include/migration/misc.h index 34e7d75713..bccc1b6b44 100644 --- a/include/migration/misc.h +++ b/include/migration/misc.h @@ -58,7 +58,6 @@ void dump_vmstate_json_to_file(FILE *out_fp); /* migration/migration.c */ void migration_object_init(void); void migration_shutdown(void); -void qemu_start_incoming_migration(const char *uri, Error **errp); bool migration_is_idle(void); bool migration_is_active(MigrationState *); void add_migration_state_change_notifier(Notifier *notify); diff --git a/migration/migration.c b/migration/migration.c index f48b03cac2..d078094c56 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -114,8 +114,6 @@ static NotifierList migration_state_notifiers = NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); -static bool deferred_incoming; - /* Messages sent on the return path from destination to source */ enum mig_rp_message_type { MIG_RP_MSG_INVALID = 0, /* Must be 0 */ @@ -257,19 +255,6 @@ static bool migrate_late_block_activate(void) MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE]; } -/* - * Called on -incoming with a defer: uri. - * The migration can be started later after any parameters have been - * changed. - */ -static void deferred_incoming_migration(Error **errp) -{ - if (deferred_incoming) { - error_setg(errp, "Incoming migration already deferred"); - } - deferred_incoming = true; -} - /* * Send a message on the return channel back to the source * of the migration. @@ -380,16 +365,14 @@ void migrate_add_address(SocketAddress *address) addrs->value = QAPI_CLONE(SocketAddress, address); } -void qemu_start_incoming_migration(const char *uri, Error **errp) +static void qemu_start_incoming_migration(const char *uri, Error **errp) { const char *p = NULL; qapi_event_send_migration(MIGRATION_STATUS_SETUP); - if (!strcmp(uri, "defer")) { - deferred_incoming_migration(errp); - } else if (strstart(uri, "tcp:", &p) || - strstart(uri, "unix:", NULL) || - strstart(uri, "vsock:", NULL)) { + if (strstart(uri, "tcp:", &p) || + strstart(uri, "unix:", NULL) || + strstart(uri, "vsock:", NULL)) { socket_start_incoming_migration(p ? p : uri, errp); #ifdef CONFIG_RDMA } else if (strstart(uri, "rdma:", &p)) { @@ -1926,14 +1909,14 @@ void qmp_migrate_incoming(const char *uri, Error **errp) Error *local_err = NULL; static bool once = true; - if (!deferred_incoming) { - error_setg(errp, "For use with '-incoming defer'"); - return; - } if (!once) { error_setg(errp, "The incoming migration has already been started"); return; } + if (!runstate_check(RUN_STATE_INMIGRATE)) { + error_setg(errp, "'-incoming' was not specified on the command line"); + return; + } qemu_start_incoming_migration(uri, &local_err); diff --git a/softmmu/vl.c b/softmmu/vl.c index ae2854d8af..583366510b 100644 --- a/softmmu/vl.c +++ b/softmmu/vl.c @@ -109,6 +109,7 @@ #include "qapi/qapi-visit-block-core.h" #include "qapi/qapi-visit-ui.h" #include "qapi/qapi-commands-block-core.h" +#include "qapi/qapi-commands-migration.h" #include "qapi/qapi-commands-run-state.h" #include "qapi/qapi-commands-ui.h" #include "qapi/qmp/qerror.h" @@ -4557,10 +4558,12 @@ void qemu_init(int argc, char **argv, char **envp) } if (incoming) { Error *local_err = NULL; - qemu_start_incoming_migration(incoming, &local_err); - if (local_err) { - error_reportf_err(local_err, "-incoming %s: ", incoming); - exit(1); + if (strcmp(incoming, "defer") != 0) { + qmp_migrate_incoming(incoming, &local_err); + if (local_err) { + error_reportf_err(local_err, "-incoming %s: ", incoming); + exit(1); + } } } else if (autostart) { vm_start();
Make qemu_start_incoming_migration local to migration/migration.c. By using the runstate instead of a separate flag, vl need not do anything to setup deferred incoming migration. qmp_migrate_incoming also does not need the deferred_incoming flag anymore, because "-incoming PROTOCOL" will clear the "once" flag before the main loop starts. Therefore, later invocations of the migrate-incoming command will fail with the existing "The incoming migration has already been started" error message. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> --- include/migration/misc.h | 1 - migration/migration.c | 33 ++++++++------------------------- softmmu/vl.c | 11 +++++++---- 3 files changed, 15 insertions(+), 30 deletions(-)