migration: Remove non-multifd compression

The 'compress' migration capability enables the old compression code
which has shown issues over the years and is thought to be less stable
and tested than the more recent multifd-based compression. The old
compression code has been deprecated in 8.2 and now is time to remove
it.

Deprecation commit 864128df46 ("migration: Deprecate old compression
method").

Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>

1 files changed, 0 insertions, 13 deletions

diff --git a/migration/migration.c b/migration/migration.c
index 6f209601d3..e88b24f1e6 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -27,7 +27,6 @@
 #include "sysemu/cpu-throttle.h"
 #include "rdma.h"
 #include "ram.h"
-#include "ram-compress.h"
 #include "migration/global_state.h"
 #include "migration/misc.h"
 #include "migration.h"
@@ -356,7 +355,6 @@ void migration_incoming_state_destroy(void)
     struct MigrationIncomingState *mis = migration_incoming_get_current();
 
     multifd_recv_cleanup();
-    compress_threads_load_cleanup();
 
     if (mis->to_src_file) {
         /* Tell source that we are done */
@@ -649,10 +647,6 @@ static void qemu_start_incoming_migration(const char *uri, bool has_channels,
         }
 #ifdef CONFIG_RDMA
     } else if (addr->transport == MIGRATION_ADDRESS_TYPE_RDMA) {
-        if (migrate_compress()) {
-            error_setg(errp, "RDMA and compression can't be used together");
-            return;
-        }
         if (migrate_xbzrle()) {
             error_setg(errp, "RDMA and XBZRLE can't be used together");
             return;
@@ -745,11 +739,6 @@ process_incoming_migration_co(void *opaque)
 
     assert(mis->from_src_file);
 
-    if (compress_threads_load_setup(mis->from_src_file)) {
-        error_setg(&local_err, "Failed to setup decompress threads");
-        goto fail;
-    }
-
     mis->largest_page_size = qemu_ram_pagesize_largest();
     postcopy_state_set(POSTCOPY_INCOMING_NONE);
     migrate_set_state(&mis->state, MIGRATION_STATUS_SETUP,
@@ -1181,8 +1170,6 @@ static void populate_ram_info(MigrationInfo *info, MigrationState *s)
         info->xbzrle_cache->overflow = xbzrle_counters.overflow;
     }
 
-    populate_compress(info);
-
     if (cpu_throttle_active()) {
         info->has_cpu_throttle_percentage = true;
         info->cpu_throttle_percentage = cpu_throttle_get_percentage();