[Qemu-devel] [PATCH 2/3] migration: Remove use of old MigrationParams

[Juan Quintela <quintela@redhat.com>]

We have change in the previous patch to use migration capabilities for
it.  Notice that we continue using the old command line flags from
migrate command from the time being.  Remove the set_params method as
now it is empty.

Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 include/migration/migration.h |  3 +--
 migration/block.c             | 17 ++---------------
 migration/colo.c              |  5 +++--
 migration/migration.c         |  8 +++++---
 migration/savevm.c            |  2 --
 5 files changed, 11 insertions(+), 24 deletions(-)

diff --git a/include/migration/migration.h b/include/migration/migration.h
index 30c2913..2d5525c 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -39,8 +39,7 @@
 #define QEMU_VM_SECTION_FOOTER       0x7e
 
 struct MigrationParams {
-    bool blk;
-    bool shared;
+    bool unused; /* C doesn't allow empty structs */
 };
 
 /* Messages sent on the return path from destination to source */
diff --git a/migration/block.c b/migration/block.c
index 060087f..fcfa823 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -94,9 +94,6 @@ typedef struct BlkMigBlock {
 } BlkMigBlock;
 
 typedef struct BlkMigState {
-    /* Written during setup phase.  Can be read without a lock.  */
-    int blk_enable;
-    int shared_base;
     QSIMPLEQ_HEAD(bmds_list, BlkMigDevState) bmds_list;
     int64_t total_sector_sum;
     bool zero_blocks;
@@ -425,7 +422,7 @@ static int init_blk_migration(QEMUFile *f)
         bmds->bulk_completed = 0;
         bmds->total_sectors = sectors;
         bmds->completed_sectors = 0;
-        bmds->shared_base = block_mig_state.shared_base;
+        bmds->shared_base = migrate_use_block_shared();
 
         assert(i < num_bs);
         bmds_bs[i].bmds = bmds;
@@ -994,22 +991,12 @@ static int block_load(QEMUFile *f, void *opaque, int version_id)
     return 0;
 }
 
-static void block_set_params(const MigrationParams *params, void *opaque)
-{
-    block_mig_state.blk_enable = params->blk;
-    block_mig_state.shared_base = params->shared;
-
-    /* shared base means that blk_enable = 1 */
-    block_mig_state.blk_enable |= params->shared;
-}
-
 static bool block_is_active(void *opaque)
 {
-    return block_mig_state.blk_enable == 1;
+    return migrate_use_block_enabled();
 }
 
 static SaveVMHandlers savevm_block_handlers = {
-    .set_params = block_set_params,
     .save_live_setup = block_save_setup,
     .save_live_iterate = block_save_iterate,
     .save_live_complete_precopy = block_save_complete,
diff --git a/migration/colo.c b/migration/colo.c
index 963c802..e772384 100644
--- a/migration/colo.c
+++ b/migration/colo.c
@@ -14,6 +14,7 @@
 #include "qemu/timer.h"
 #include "sysemu/sysemu.h"
 #include "migration/colo.h"
+#include "migration/block.h"
 #include "io/channel-buffer.h"
 #include "trace.h"
 #include "qemu/error-report.h"
@@ -345,8 +346,8 @@ static int colo_do_checkpoint_transaction(MigrationState *s,
     }
 
     /* Disable block migration */
-    s->params.blk = 0;
-    s->params.shared = 0;
+    migrate_set_block_enabled(s, false);
+    migrate_set_block_shared(s, false);
     qemu_savevm_state_header(fb);
     qemu_savevm_state_begin(fb, &s->params);
     qemu_mutex_lock_iothread();
diff --git a/migration/migration.c b/migration/migration.c
index 2f981aa..8a3bf89 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -787,6 +787,10 @@ void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
         s->enabled_capabilities[cap->value->capability] = cap->value->state;
     }
 
+    if (s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK_SHARED]) {
+        s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK_ENABLED] = true;
+    }
+
     if (migrate_postcopy_ram()) {
         if (migrate_use_compression()) {
             /* The decompression threads asynchronously write into RAM
@@ -1214,9 +1218,6 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
     MigrationParams params;
     const char *p;
 
-    params.blk = has_blk && blk;
-    params.shared = has_inc && inc;
-
     if (migration_is_setup_or_active(s->state) ||
         s->state == MIGRATION_STATUS_CANCELLING ||
         s->state == MIGRATION_STATUS_COLO) {
@@ -1239,6 +1240,7 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
     }
 
     if (has_inc && inc) {
+        migrate_set_block_enabled(s, true);
         migrate_set_block_shared(s, true);
     }
 
diff --git a/migration/savevm.c b/migration/savevm.c
index f8d1e8b..221fb4b 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -1233,8 +1233,6 @@ static int qemu_savevm_state(QEMUFile *f, Error **errp)
 {
     int ret;
     MigrationParams params = {
-        .blk = 0,
-        .shared = 0
     };
     MigrationState *ms = migrate_init(&params);
     MigrationStatus status;
-- 
2.9.3