[PATCH 2/4] qemu_migration: Implement VIR_MIGRATE_DIRTY_LIMIT flag

[Hyman Huang <yong.huang@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Signed-off-by: Hyman Huang <yong.huang@xxxxxxxxxx>
---
 src/qemu/qemu_migration.c        | 8 ++++++++
 src/qemu/qemu_migration.h        | 1 +
 src/qemu/qemu_migration_params.c | 6 ++++++
 src/qemu/qemu_migration_params.h | 1 +
 4 files changed, 16 insertions(+)

diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index f9c34b72e8..ec653181ff 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -2571,6 +2571,14 @@ qemuMigrationSrcBeginPhase(virQEMUDriver *driver,
     if (!qemuMigrationSrcIsAllowed(vm, true, vm->job->asyncJob, flags))
         return NULL;
 
+    if (flags & VIR_MIGRATE_DIRTY_LIMIT &&
+        (!(vm->def->features[VIR_DOMAIN_FEATURE_KVM] == VIR_TRISTATE_SWITCH_ON &&
+           vm->def->kvm_features->features[VIR_DOMAIN_KVM_DIRTY_RING] == VIR_TRISTATE_SWITCH_ON))) {
+        virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED, "%s",
+                       _("dirtylimit migration requires dirty-ring features enabled"));
+        return NULL;
+    }
+
     if (!(flags & (VIR_MIGRATE_UNSAFE | VIR_MIGRATE_OFFLINE)) &&
         !qemuMigrationSrcIsSafe(vm->def, priv->qemuCaps,
                                 nmigrate_disks, migrate_disks, flags))
diff --git a/src/qemu/qemu_migration.h b/src/qemu/qemu_migration.h
index ed62fd4a91..a2a598fe28 100644
--- a/src/qemu/qemu_migration.h
+++ b/src/qemu/qemu_migration.h
@@ -62,6 +62,7 @@
      VIR_MIGRATE_NON_SHARED_SYNCHRONOUS_WRITES | \
      VIR_MIGRATE_POSTCOPY_RESUME | \
      VIR_MIGRATE_ZEROCOPY | \
+     VIR_MIGRATE_DIRTY_LIMIT | \
      0)
 
 /* All supported migration parameters and their types. */
diff --git a/src/qemu/qemu_migration_params.c b/src/qemu/qemu_migration_params.c
index 79fe6e97c8..797293d8e7 100644
--- a/src/qemu/qemu_migration_params.c
+++ b/src/qemu/qemu_migration_params.c
@@ -99,6 +99,7 @@ VIR_ENUM_IMPL(qemuMigrationCapability,
               "dirty-bitmaps",
               "return-path",
               "zero-copy-send",
+              "dirty-limit",
 );
 
 
@@ -194,6 +195,11 @@ static const qemuMigrationParamsFlagMapItem qemuMigrationParamsFlagMap[] = {
      VIR_MIGRATE_ZEROCOPY,
      QEMU_MIGRATION_CAP_ZERO_COPY_SEND,
      QEMU_MIGRATION_SOURCE},
+
+    {QEMU_MIGRATION_FLAG_REQUIRED,
+     VIR_MIGRATE_DIRTY_LIMIT,
+     QEMU_MIGRATION_CAP_DIRTY_LIMIT,
+     QEMU_MIGRATION_SOURCE},
 };
 
 /* Translation from VIR_MIGRATE_PARAM_* typed parameters to
diff --git a/src/qemu/qemu_migration_params.h b/src/qemu/qemu_migration_params.h
index 5857673227..44a44aae07 100644
--- a/src/qemu/qemu_migration_params.h
+++ b/src/qemu/qemu_migration_params.h
@@ -40,6 +40,7 @@ typedef enum {
     QEMU_MIGRATION_CAP_BLOCK_DIRTY_BITMAPS,
     QEMU_MIGRATION_CAP_RETURN_PATH,
     QEMU_MIGRATION_CAP_ZERO_COPY_SEND,
+    QEMU_MIGRATION_CAP_DIRTY_LIMIT,
 
     QEMU_MIGRATION_CAP_LAST
 } qemuMigrationCapability;
-- 
2.39.1
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