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From e6f62c7eb81f164ad5aef99a4f7ff48200928938 Mon Sep 17 00:00:00 2001
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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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Date: Wed, 22 Nov 2017 15:41:32 +0100
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Subject: [PATCH 2/7] migration: Reenable incoming live-block-migration
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RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Message-id: <20171122154132.15363-1-dgilbert@redhat.com>
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Patchwork-id: 77779
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O-Subject: [RHEL-7.5 qemu-kvm-rhev PATCH 1/1] migration: Reenable incoming live-block-migration
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Bugzilla: 1515173
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Juan Quintela <quintela@redhat.com>
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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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rhel7 has always disabled outgoing old-style live block migration
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(but in -rhev enabled nbd block migration); however it allows
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incoming old-style live block migration to allow reception of a stream
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from rhel6.
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I added --disable-live-block-migration to upstream in ed1701c6a5a,
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however that really did disable it completely.
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In the 7.5 world we've inherited the upstream version and lost the
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incoming support.
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Reenable incoming support even when outgoing is disabled.
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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include/migration/misc.h | 7 +++----
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migration/Makefile.objs | 2 +-
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migration/block.h | 6 +++++-
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3 files changed, 9 insertions(+), 6 deletions(-)
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diff --git a/include/migration/misc.h b/include/migration/misc.h
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index c079b77..1d060df 100644
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--- a/include/migration/misc.h
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+++ b/include/migration/misc.h
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@@ -22,11 +22,10 @@ void ram_mig_init(void);
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/* migration/block.c */
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-#ifdef CONFIG_LIVE_BLOCK_MIGRATION
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+/* RHEL7 allows incoming block migration even with
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+ * --disable-live-block-migration to allow RHEL6->7 migration.
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+ */
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void blk_mig_init(void);
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-#else
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-static inline void blk_mig_init(void) {}
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-#endif
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#define SELF_ANNOUNCE_ROUNDS 5
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diff --git a/migration/Makefile.objs b/migration/Makefile.objs
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index 1c7770d..4277c88 100644
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--- a/migration/Makefile.objs
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+++ b/migration/Makefile.objs
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@@ -9,5 +9,5 @@ common-obj-y += qjson.o
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common-obj-$(CONFIG_RDMA) += rdma.o
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-common-obj-$(CONFIG_LIVE_BLOCK_MIGRATION) += block.o
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+common-obj-y += block.o
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diff --git a/migration/block.h b/migration/block.h
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index 22ebe94..c4ab848 100644
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--- a/migration/block.h
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+++ b/migration/block.h
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@@ -14,7 +14,11 @@
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#ifndef MIGRATION_BLOCK_H
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#define MIGRATION_BLOCK_H
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-#ifdef CONFIG_LIVE_BLOCK_MIGRATION
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+/* RHEL7: live block migration is still compiled in even
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+ * with --disable-live-block-migration since we must
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+ * allow inbound migration from RHEL6.
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+ */
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+#if 1 /* CONFIG_LIVE_BLOCK_MIGRATION */
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int blk_mig_active(void);
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uint64_t blk_mig_bytes_transferred(void);
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uint64_t blk_mig_bytes_remaining(void);
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--
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1.8.3.1
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