diff options
| author | Ashijeet Acharya <ashijeetacharya@gmail.com> | 2017-02-08 19:58:45 +0530 |
|---|---|---|
| committer | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2017-02-13 17:27:13 +0000 |
| commit | 0827b9e97d443781a17a21c64695940675aa1f8a (patch) | |
| tree | b3962d8af015e971b66b9c7c0c79cc42182e17e3 | |
| parent | ced1c6166ef901a91578d54ff39f46b3e7ae870f (diff) | |
migrate: Introduce zero RAM checks to skip RAM migration
Migration of a "none" machine with no RAM crashes abruptly as
bitmap_new() fails and thus aborts. Instead place zero RAM checks at
appropriate places to skip migration of RAM in this case and complete
migration successfully for devices only.
Signed-off-by: Ashijeet Acharya <ashijeetacharya@gmail.com>
Message-Id: <1486564125-31366-1-git-send-email-ashijeetacharya@gmail.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
| -rw-r--r-- | migration/ram.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/migration/ram.c b/migration/ram.c index 67f2efbc59..f289fcddd5 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1346,6 +1346,11 @@ static int ram_find_and_save_block(QEMUFile *f, bool last_stage, ram_addr_t dirty_ram_abs; /* Address of the start of the dirty page in ram_addr_t space */ + /* No dirty page as there is zero RAM */ + if (!ram_bytes_total()) { + return pages; + } + pss.block = last_seen_block; pss.offset = last_offset; pss.complete_round = false; @@ -1952,14 +1957,17 @@ static int ram_save_init_globals(void) bytes_transferred = 0; reset_ram_globals(); - ram_bitmap_pages = last_ram_offset() >> TARGET_PAGE_BITS; migration_bitmap_rcu = g_new0(struct BitmapRcu, 1); - migration_bitmap_rcu->bmap = bitmap_new(ram_bitmap_pages); - bitmap_set(migration_bitmap_rcu->bmap, 0, ram_bitmap_pages); - - if (migrate_postcopy_ram()) { - migration_bitmap_rcu->unsentmap = bitmap_new(ram_bitmap_pages); - bitmap_set(migration_bitmap_rcu->unsentmap, 0, ram_bitmap_pages); + /* Skip setting bitmap if there is no RAM */ + if (ram_bytes_total()) { + ram_bitmap_pages = last_ram_offset() >> TARGET_PAGE_BITS; + migration_bitmap_rcu->bmap = bitmap_new(ram_bitmap_pages); + bitmap_set(migration_bitmap_rcu->bmap, 0, ram_bitmap_pages); + + if (migrate_postcopy_ram()) { + migration_bitmap_rcu->unsentmap = bitmap_new(ram_bitmap_pages); + bitmap_set(migration_bitmap_rcu->unsentmap, 0, ram_bitmap_pages); + } } /* |