diff options
| author | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2015-11-05 18:11:10 +0000 |
|---|---|---|
| committer | Juan Quintela <quintela@redhat.com> | 2015-11-10 15:00:27 +0100 |
| commit | 696ed9a9b3fee2d033d7b049ba2e6568860a25d1 (patch) | |
| tree | 317ab8b7c7c55a69b83ad3bcd6c5e478a6e52573 /include | |
| parent | a82d593b61054b3dea431ef829977000d772a252 (diff) | |
postcopy_ram.c: place_page and helpers
postcopy_place_page (etc) provide a way for postcopy to place a page
into guests memory atomically (using the copy ioctl on the ufd).
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/migration/migration.h | 1 | ||||
| -rw-r--r-- | include/migration/postcopy-ram.h | 21 |
2 files changed, 22 insertions, 0 deletions
diff --git a/include/migration/migration.h b/include/migration/migration.h index 1491bf32ed..a48471e026 100644 --- a/include/migration/migration.h +++ b/include/migration/migration.h @@ -96,6 +96,7 @@ struct MigrationIncomingState { int userfault_fd; QEMUFile *to_src_file; QemuMutex rp_mutex; /* We send replies from multiple threads */ + void *postcopy_tmp_page; /* See savevm.c */ LoadStateEntry_Head loadvm_handlers; diff --git a/include/migration/postcopy-ram.h b/include/migration/postcopy-ram.h index b10c03db6e..d7c292fffa 100644 --- a/include/migration/postcopy-ram.h +++ b/include/migration/postcopy-ram.h @@ -69,4 +69,25 @@ void postcopy_discard_send_range(MigrationState *ms, PostcopyDiscardState *pds, void postcopy_discard_send_finish(MigrationState *ms, PostcopyDiscardState *pds); +/* + * Place a page (from) at (host) efficiently + * There are restrictions on how 'from' must be mapped, in general best + * to use other postcopy_ routines to allocate. + * returns 0 on success + */ +int postcopy_place_page(MigrationIncomingState *mis, void *host, void *from); + +/* + * Place a zero page at (host) atomically + * returns 0 on success + */ +int postcopy_place_page_zero(MigrationIncomingState *mis, void *host); + +/* + * Allocate a page of memory that can be mapped at a later point in time + * using postcopy_place_page + * Returns: Pointer to allocated page + */ +void *postcopy_get_tmp_page(MigrationIncomingState *mis); + #endif |