diff options
Diffstat (limited to 'migration/postcopy-ram.h')
| -rw-r--r-- | migration/postcopy-ram.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/migration/postcopy-ram.h b/migration/postcopy-ram.h index 4c25f03be2..52d51e8007 100644 --- a/migration/postcopy-ram.h +++ b/migration/postcopy-ram.h @@ -81,6 +81,28 @@ int postcopy_place_page(MigrationIncomingState *mis, void *host, void *from, int postcopy_place_page_zero(MigrationIncomingState *mis, void *host, size_t pagesize); +/* The current postcopy state is read/set by postcopy_state_get/set + * which update it atomically. + * The state is updated as postcopy messages are received, and + * in general only one thread should be writing to the state at any one + * time, initially the main thread and then the listen thread; + * Corner cases are where either thread finishes early and/or errors. + * The state is checked as messages are received to ensure that + * the source is sending us messages in the correct order. + * The state is also used by the RAM reception code to know if it + * has to place pages atomically, and the cleanup code at the end of + * the main thread to know if it has to delay cleanup until the end + * of postcopy. + */ +typedef enum { + POSTCOPY_INCOMING_NONE = 0, /* Initial state - no postcopy */ + POSTCOPY_INCOMING_ADVISE, + POSTCOPY_INCOMING_DISCARD, + POSTCOPY_INCOMING_LISTENING, + POSTCOPY_INCOMING_RUNNING, + POSTCOPY_INCOMING_END +} PostcopyState; + /* * Allocate a page of memory that can be mapped at a later point in time * using postcopy_place_page @@ -88,4 +110,8 @@ int postcopy_place_page_zero(MigrationIncomingState *mis, void *host, */ void *postcopy_get_tmp_page(MigrationIncomingState *mis); +PostcopyState postcopy_state_get(void); +/* Set the state and return the old state */ +PostcopyState postcopy_state_set(PostcopyState new_state); + #endif |