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Re: [Qemu-devel] [PATCH v5 23/45] migrate_start_postcopy: Command to tri
From: |
David Gibson |
Subject: |
Re: [Qemu-devel] [PATCH v5 23/45] migrate_start_postcopy: Command to trigger transition to postcopy |
Date: |
Fri, 13 Mar 2015 12:26:52 +1100 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Wed, Feb 25, 2015 at 04:51:46PM +0000, Dr. David Alan Gilbert (git) wrote:
> From: "Dr. David Alan Gilbert" <address@hidden>
>
> Once postcopy is enabled (with migrate_set_capability), the migration
> will still start on precopy mode. To cause a transition into postcopy
> the:
>
> migrate_start_postcopy
>
> command must be issued. Postcopy will start sometime after this
> (when it's next checked in the migration loop).
>
> Issuing the command before migration has started will error,
> and issuing after it has finished is ignored.
>
> Signed-off-by: Dr. David Alan Gilbert <address@hidden>
> Reviewed-by: Eric Blake <address@hidden>
> ---
> hmp-commands.hx | 15 +++++++++++++++
> hmp.c | 7 +++++++
> hmp.h | 1 +
> include/migration/migration.h | 3 +++
> migration/migration.c | 22 ++++++++++++++++++++++
> qapi-schema.json | 8 ++++++++
> qmp-commands.hx | 19 +++++++++++++++++++
> 7 files changed, 75 insertions(+)
>
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index e37bc8b..03b8b78 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -985,6 +985,21 @@ Enable/Disable the usage of a capability
> @var{capability} for migration.
> ETEXI
>
> {
> + .name = "migrate_start_postcopy",
> + .args_type = "",
> + .params = "",
> + .help = "Switch migration to postcopy mode",
> + .mhandler.cmd = hmp_migrate_start_postcopy,
> + },
> +
> +STEXI
> address@hidden migrate_start_postcopy
> address@hidden migrate_start_postcopy
> +Switch in-progress migration to postcopy mode. Ignored after the end of
> +migration (or once already in postcopy).
> +ETEXI
> +
> + {
> .name = "client_migrate_info",
> .args_type =
> "protocol:s,hostname:s,port:i?,tls-port:i?,cert-subject:s?",
> .params = "protocol hostname port tls-port cert-subject",
> diff --git a/hmp.c b/hmp.c
> index b47f331..df9736c 100644
> --- a/hmp.c
> +++ b/hmp.c
> @@ -1140,6 +1140,13 @@ void hmp_migrate_set_capability(Monitor *mon, const
> QDict *qdict)
> }
> }
>
> +void hmp_migrate_start_postcopy(Monitor *mon, const QDict *qdict)
> +{
> + Error *err = NULL;
> + qmp_migrate_start_postcopy(&err);
> + hmp_handle_error(mon, &err);
> +}
> +
> void hmp_set_password(Monitor *mon, const QDict *qdict)
> {
> const char *protocol = qdict_get_str(qdict, "protocol");
> diff --git a/hmp.h b/hmp.h
> index 4bb5dca..da1334f 100644
> --- a/hmp.h
> +++ b/hmp.h
> @@ -64,6 +64,7 @@ void hmp_migrate_set_downtime(Monitor *mon, const QDict
> *qdict);
> void hmp_migrate_set_speed(Monitor *mon, const QDict *qdict);
> void hmp_migrate_set_capability(Monitor *mon, const QDict *qdict);
> void hmp_migrate_set_cache_size(Monitor *mon, const QDict *qdict);
> +void hmp_migrate_start_postcopy(Monitor *mon, const QDict *qdict);
> void hmp_set_password(Monitor *mon, const QDict *qdict);
> void hmp_expire_password(Monitor *mon, const QDict *qdict);
> void hmp_eject(Monitor *mon, const QDict *qdict);
> diff --git a/include/migration/migration.h b/include/migration/migration.h
> index e6a814a..293c83e 100644
> --- a/include/migration/migration.h
> +++ b/include/migration/migration.h
> @@ -104,6 +104,9 @@ struct MigrationState
> int64_t xbzrle_cache_size;
> int64_t setup_time;
> int64_t dirty_sync_count;
> +
> + /* Flag set once the migration has been asked to enter postcopy */
> + bool start_postcopy;
> };
>
> void process_incoming_migration(QEMUFile *f);
> diff --git a/migration/migration.c b/migration/migration.c
> index a4fc7d7..43ca656 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -372,6 +372,28 @@ void
> qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
> }
> }
>
> +void qmp_migrate_start_postcopy(Error **errp)
> +{
> + MigrationState *s = migrate_get_current();
> +
> + if (!migrate_postcopy_ram()) {
> + error_setg(errp, "Enable postcopy with migration_set_capability
> before"
> + " the start of migration");
> + return;
> + }
> +
> + if (s->state == MIG_STATE_NONE) {
> + error_setg(errp, "Postcopy must be started after migration has been"
> + " started");
> + return;
> + }
> + /*
> + * we don't error if migration has finished since that would be racy
> + * with issuing this command.
> + */
> + atomic_set(&s->start_postcopy, true);
Why atomic_set?
> +}
> +
> /* shared migration helpers */
>
> static void migrate_set_state(MigrationState *s, int old_state, int
> new_state)
> diff --git a/qapi-schema.json b/qapi-schema.json
> index a8af1cb..7ff61e9 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -542,6 +542,14 @@
> { 'command': 'query-migrate-capabilities', 'returns':
> ['MigrationCapabilityStatus']}
>
> ##
> +# @migrate-start-postcopy
> +#
> +# Switch migration to postcopy mode
> +#
> +# Since: 2.3
> +{ 'command': 'migrate-start-postcopy' }
> +
> +##
> # @MouseInfo:
> #
> # Information about a mouse device.
> diff --git a/qmp-commands.hx b/qmp-commands.hx
> index a85d847..25d2208 100644
> --- a/qmp-commands.hx
> +++ b/qmp-commands.hx
> @@ -685,6 +685,25 @@ Example:
>
> EQMP
> {
> + .name = "migrate-start-postcopy",
> + .args_type = "",
> + .mhandler.cmd_new = qmp_marshal_input_migrate_start_postcopy,
> + },
> +
> +SQMP
> +migrate-start-postcopy
> +----------------------
> +
> +Switch an in-progress migration to postcopy mode. Ignored after the end of
> +migration (or once already in postcopy).
> +
> +Example:
> +-> { "execute": "migrate-start-postcopy" }
> +<- { "return": {} }
> +
> +EQMP
> +
> + {
> .name = "query-migrate-cache-size",
> .args_type = "",
> .mhandler.cmd_new = qmp_marshal_input_query_migrate_cache_size,
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
pgp_JW9joiRy7.pgp
Description: PGP signature
- Re: [Qemu-devel] [PATCH v5 23/45] migrate_start_postcopy: Command to trigger transition to postcopy,
David Gibson <=
- Re: [Qemu-devel] [PATCH v5 23/45] migrate_start_postcopy: Command to trigger transition to postcopy, Dr. David Alan Gilbert, 2015/03/13
- Re: [Qemu-devel] [PATCH v5 23/45] migrate_start_postcopy: Command to trigger transition to postcopy, David Gibson, 2015/03/16
- Re: [Qemu-devel] [PATCH v5 23/45] migrate_start_postcopy: Command to trigger transition to postcopy, Dr. David Alan Gilbert, 2015/03/18
- Re: [Qemu-devel] [PATCH v5 23/45] migrate_start_postcopy: Command to trigger transition to postcopy, David Gibson, 2015/03/19
- Re: [Qemu-devel] [PATCH v5 23/45] migrate_start_postcopy: Command to trigger transition to postcopy, Dr. David Alan Gilbert, 2015/03/19
- Re: [Qemu-devel] [PATCH v5 23/45] migrate_start_postcopy: Command to trigger transition to postcopy, David Gibson, 2015/03/22
- Re: [Qemu-devel] [PATCH v5 23/45] migrate_start_postcopy: Command to trigger transition to postcopy, Paolo Bonzini, 2015/03/30
- Re: [Qemu-devel] [PATCH v5 23/45] migrate_start_postcopy: Command to trigger transition to postcopy, Dr. David Alan Gilbert, 2015/03/30
- Re: [Qemu-devel] [PATCH v5 23/45] migrate_start_postcopy: Command to trigger transition to postcopy, Paolo Bonzini, 2015/03/30
- Re: [Qemu-devel] [PATCH v5 23/45] migrate_start_postcopy: Command to trigger transition to postcopy, Dr. David Alan Gilbert, 2015/03/31