From 291074de7615878e297df1e821f9a71ce5dd784a Mon Sep 17 00:00:00 2001
From: Jeff Cody <jcody@redhat.com>
Date: Thu, 7 Nov 2013 07:33:12 +0100
Subject: [PATCH 59/81] migration: disable live block migration (-b/-i) for rhel and rhev

RH-Author: Jeff Cody <jcody@redhat.com>
Message-id: <696b8063664491b1d1799450b4498927c2ae9908.1383712781.git.jcody@redhat.com>
Patchwork-id: 55480
O-Subject: [RHEL7 qemu-kvm PATCH 3/3] migration: disable live block migration (-b/-i) for rhel and rhev
Bugzilla: 1022392
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: Eric Blake <eblake@redhat.com>
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>

This disables live block migration (both -b and -i options) for both
the RHEL and RHEV versions of qemu-kvm.  Rather than delete the options
from the QAPI/QMP commands (which would be unfriendly to libvirt), the
options return a QMP error of unsupported ("this feature or command is
not currently supported").

A configure option to enable/disable this is set, which defaults to the
command options being disabled.  Just to be safe, the rpm spec template
explicitly disables it as well.

Signed-off-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 configure                     |   12 ++++++++++++
 migration.c                   |    7 +++++++
 redhat/qemu-kvm.spec.template |    1 +
 3 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/configure b/configure
index 9260d3c..d658434 100755
--- a/configure
+++ b/configure
@@ -241,6 +241,7 @@ gtkabi="2.0"
 tpm="no"
 libssh2=""
 live_block_ops="yes"
+live_block_migration="no"
 
 # parse CC options first
 for opt do
@@ -932,6 +933,10 @@ for opt do
   ;;
   --enable-live-block-ops) live_block_ops="yes"
   ;;
+  --disable-live-block-migration) live_block_migration="no"
+  ;;
+  --enable-live-block-migration) live_block_migration="yes"
+  ;;
 *) echo "ERROR: unknown option $opt"; show_help="yes"
   ;;
   esac
@@ -1202,6 +1207,8 @@ echo "  --disable-libssh2        disable ssh block device support"
 echo "  --enable-libssh2         enable ssh block device support"
 echo "  --disable-live-block-ops disable live block operations support"
 echo "  --enable-live-block-ops  enable live block operations support"
+echo "  --disable-live-block-migration disable live block migration"
+echo "  --enable-live-block-migration  enable live block migration"
 echo ""
 echo "NOTE: The object files are built at the place where configure is launched"
 exit 1
@@ -3564,6 +3571,7 @@ echo "libssh2 support   $libssh2"
 echo "TPM passthrough   $tpm_passthrough"
 echo "QOM debugging     $qom_cast_debug"
 echo "Live block operations $live_block_ops"
+echo "Live block migration $live_block_migration"
 
 if test "$sdl_too_old" = "yes"; then
 echo "-> Your SDL version is too old - please upgrade to have SDL support"
@@ -3952,6 +3960,10 @@ if test "$live_block_ops" = "yes" ; then
   echo "CONFIG_LIVE_BLOCK_OPS=y" >> $config_host_mak
 fi
 
+if test "$live_block_migration" = "yes" ; then
+  echo "CONFIG_LIVE_BLOCK_MIGRATION=y" >> $config_host_mak
+fi
+
 # USB host support
 if test "$libusb" = "yes"; then
   echo "HOST_USB=libusb legacy" >> $config_host_mak
diff --git a/migration.c b/migration.c
index 6b87272..46c633a 100644
--- a/migration.c
+++ b/migration.c
@@ -388,6 +388,13 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
     params.blk = has_blk && blk;
     params.shared = has_inc && inc;
 
+#ifndef CONFIG_LIVE_BLOCK_MIGRATION
+    if (params.blk || params.shared) {
+        error_set(errp, QERR_UNSUPPORTED);
+        return;
+    }
+#endif
+
     if (s->state == MIG_STATE_ACTIVE) {
         error_set(errp, QERR_MIGRATION_ACTIVE);
         return;
-- 
1.7.1