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server/spice.h: semi-seamless migration interface, RHBZ #738266

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semi-seamless migration details:

migration source side
---------------------
(1) spice_server_migrate_connect (*): tell client to link
    to the target side - send SPICE_MSG_MAIN_MIGRATE_BEGIN.
    This should be called upon client_migrate_info cmd.
    client_migrate_info is asynchronous.
(2) Complete spice_server_migrate_connect only when the client has been connected
    to the target - wait for SPICE_MSGC_MAIN_MIGRATE_(CONNECTED|CONNECT_ERROR) or a timeout.
(3) spice_server_migrate_end: tell client migration it can switch to the target - send
    SPICE_MSG_MAIN_MIGRATE_END.
(4) client cleans up all data related to the connection to the source and switches to the target.
    It sends SPICE_MSGC_MAIN_MIGRATE_END.

migration target side
---------------------
(1) the server identifies itself as a migraiton target since the client is linked with (connection_id != 0)
(2) server doesn't start the channels' logic (channel->link) till it receives SPICE_MSGC_MAIN_MIGRATE_END
    from the client.

*   After migration starts, the target qemu is blocked and cannot accept new spice client
    connections. Thus, we trigger the connection to the target upon client_migrate_info
    command.
This commit is contained in:
Yonit Halperin 2011-09-14 14:21:49 +03:00
parent b353c8e04f
commit 6e56bea67c
3 changed files with 35 additions and 4 deletions
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9
server/reds.c
View File

@ -4854,6 +4854,15 @@ SPICE_GNUC_VISIBLE int spice_server_set_agent_copypaste(SpiceServer *s, int enab
return 0;
}
/* semi-seamless client migration */
SPICE_GNUC_VISIBLE int spice_server_migrate_connect(SpiceServer *s, const char* dest,
int port, int secure_port,
const char* cert_subject)
{
red_printf("not implemented yet");
return 0;
}
SPICE_GNUC_VISIBLE int spice_server_migrate_info(SpiceServer *s, const char* dest,
int port, int secure_port,
const char* cert_subject)

3
server/spice-experimental.h
View File

@ -29,16 +29,13 @@ void spice_server_net_wire_recv_packet(SpiceNetWireInstance *sin,
const uint8_t *pkt, int len);
/* spice seamless client migration (broken) */
enum {
SPICE_MIGRATE_CLIENT_NONE = 1,
SPICE_MIGRATE_CLIENT_WAITING,
SPICE_MIGRATE_CLIENT_READY,
};
int spice_server_migrate_start(SpiceServer *s);
int spice_server_migrate_client_state(SpiceServer *s);
int spice_server_migrate_end(SpiceServer *s, int completed);
#endif // __SPICE_EXPERIMENTAL_H__

27
server/spice.h
View File

@ -469,11 +469,36 @@ int spice_server_set_agent_copypaste(SpiceServer *s, int enable);
int spice_server_get_sock_info(SpiceServer *s, struct sockaddr *sa, socklen_t *salen);
int spice_server_get_peer_info(SpiceServer *s, struct sockaddr *sa, socklen_t *salen);
/* spice switch-host client migration */
/* migration interface */
#define SPICE_INTERFACE_MIGRATION "migration"
#define SPICE_INTERFACE_MIGRATION_MAJOR 1
#define SPICE_INTERFACE_MIGRATION_MINOR 1
typedef struct SpiceMigrateInterface SpiceMigrateInterface;
typedef struct SpiceMigrateInstance SpiceMigrateInstance;
typedef struct SpiceMigrateState SpiceMigrateState;
struct SpiceMigrateInterface {
SpiceBaseInterface base;
void (*migrate_connect_complete)(SpiceMigrateInstance *sin);
void (*migrate_end_complete)(SpiceMigrateInstance *sin);
};
struct SpiceMigrateInstance {
SpiceBaseInstance base;
SpiceMigrateState *st;
};
/* spice switch-host client migration */
int spice_server_migrate_info(SpiceServer *s, const char* dest,
int port, int secure_port,
const char* cert_subject);
int spice_server_migrate_switch(SpiceServer *s);
/* spice (semi-)seamless client migration */
int spice_server_migrate_connect(SpiceServer *s, const char* dest,
int port, int secure_port,
const char* cert_subject);
int spice_server_migrate_start(SpiceServer *s);
int spice_server_migrate_end(SpiceServer *s, int completed);
#endif