File xen.xl-migration-debug.patch of Package xen

From: Olaf Hering <olaf@aepfle.de>
Date: Thu, 29 Oct 2020 17:00:19 +0100
Subject: xl migration debug

xl: fix description of migrate --debug

xl migrate --debug used to track every pfn in every batch of pages.
But these times are gone. Adjust the help text to tell what --debug
is supposed to do today.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
---
 docs/man/xl.1.pod.in   | 4 +++-
 tools/xl/xl_cmdtable.c | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

--- a/docs/man/xl.1.pod.in
+++ b/docs/man/xl.1.pod.in
@@ -472,25 +472,27 @@ domain. See the corresponding option of the I<create> subcommand.
 
 =item B<-C> I<config>
 
 Send the specified <config> file instead of the file used on creation of the
 domain.
 
 =item B<-T>
 
 Include timestamps in output.
 
 =item B<--debug>
 
-Display huge (!) amount of debug information during the migration process.
+Verify transferred domU page data. All memory will be transferred one more
+time to the destination host while the domU is paused, and compared with
+the result of the inital transfer while the domU was still running.
 
 =item B<-p>
 
 Leave the domain on the receive side paused after migration.
 
 =item B<-D>
 
 Preserve the B<domain-id> in the domain coniguration that is transferred
 such that it will be identical on the destination host, unless that
 configuration is overridden using the B<-C> option. Note that it is not
 possible to use this option for a 'localhost' migration.
 
--- a/tools/xl/xl_cmdtable.c
+++ b/tools/xl/xl_cmdtable.c
@@ -159,25 +159,25 @@ struct cmd_spec cmd_table[] = {
     { "migrate",
       &main_migrate, 0, 1,
       "Migrate a domain to another host",
       "[options] <Domain> <host>",
       "-h              Print this help.\n"
       "-C <config>     Send <config> instead of config file from creation.\n"
       "-s <sshcommand> Use <sshcommand> instead of ssh.  String will be passed\n"
       "                to sh. If empty, run <host> instead of ssh <host> xl\n"
       "                migrate-receive [-d -e]\n"
       "-e              Do not wait in the background (on <host>) for the death\n"
       "                of the domain.\n"
       "-T              Show timestamps during the migration process.\n"
-      "--debug         Print huge (!) amount of debug during the migration process.\n"
+      "--debug         Verify transferred domU page data.\n"
       "-p              Do not unpause domain after migrating it.\n"
       "-D              Preserve the domain id"
     },
     { "restore",
       &main_restore, 0, 1,
       "Restore a domain from a saved state",
       "[options] [<ConfigFile>] <CheckpointFile>",
       "-h                       Print this help.\n"
       "-p                       Do not unpause domain after restoring it.\n"
       "-e                       Do not wait in the background for the death of the domain.\n"
       "-d                       Enable debug messages.\n"
       "-V, --vncviewer          Connect to the VNC display after the domain is created.\n"
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