[patch v2 1/1] manual: Add virsh manual about specified migration host

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the 'migration_host' description maybe have a bit of difficulty to
understand for user, so add this manual for them.

Signed-off-by: Chen Fan <chen.fan.fnst@xxxxxxxxxxxxxx>
---
 tools/virsh.pod | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/tools/virsh.pod b/tools/virsh.pod
index 02671b4..7b30292 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -1208,7 +1208,8 @@ such as GFS2 or GPFS. If you are sure the migration is safe or you just do not
 care, use I<--unsafe> to force the migration.
 
 The I<desturi> is the connection URI of the destination host, and
-I<migrateuri> is the migration URI, which usually can be omitted (see below).
+I<migrateuri> is the migration URI for specifying which IP address/URI of the
+destination host to tansfer migration data, which usually can be omitted (see below).
 I<dname> is used for renaming the domain to new name during migration, which
 also usually can be omitted.  Likewise, I<--xml> B<file> is usually
 omitted, but can be used to supply an alternative XML file for use on
@@ -1238,6 +1239,15 @@ seen from the source machine.
 
 When I<migrateuri> is not specified, libvirt will automatically determine the
 hypervisor specific URI, by looking up the target host's configured hostname.
+
+For QEMU/KVM hypervisor, when I<migrateuri> is not specified, at first libvirt
+will ask the destination side whether the optional "migration_host" is specified
+or not, if the "migration_host" is specified, libvirt will use the specified
+network for transferring migration data(the "migrateion_host" is useful when
+hosts has multiple network interface). if the "migrateion_host" is not specified
+too, libvirt will automatically determine the hypervisor specific URI, by looking
+up the target host's configured hostname.
+
 There are a few scenarios where specifying I<migrateuri> may help:
 
 =over 4
-- 
1.9.3

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