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[PATCH v20210713 04/31] xl: fix description of migrate --debug

xl migrate --debug used to track every pfn in every batch of pages.
But these times are gone. The code in xc_domain_save is the consumer
of this knob, now may enable verification mode.

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
- adjust to describe what --debug would do when the code which
  consumes this knob is fixed.
- the option has no effect anymore
 docs/man/xl.1.pod.in   | 4 +++-
 tools/xl/xl_cmdtable.c | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/docs/man/xl.1.pod.in b/docs/man/xl.1.pod.in
index e2176bd696..bae557b1de 100644
--- a/docs/man/xl.1.pod.in
+++ b/docs/man/xl.1.pod.in
@@ -481,7 +481,9 @@ domain.
 =item B<--debug>
-Display huge (!) amount of debug information during the migration process.
+This enables verification mode, which will transfer the entire domU memory
+once more to the receiving host to make sure the content is identical on
+both sides.
 =item B<-p>
diff --git a/tools/xl/xl_cmdtable.c b/tools/xl/xl_cmdtable.c
index 661323d488..e4f27a3248 100644
--- a/tools/xl/xl_cmdtable.c
+++ b/tools/xl/xl_cmdtable.c
@@ -172,7 +172,7 @@ const struct cmd_spec cmd_table[] = {
       "                migrate-receive [-d -e]\n"
       "-e              Do not wait in the background (on <host>) for the 
       "                of the domain.\n"
-      "--debug         Print huge (!) amount of debug during the migration 
+      "--debug         Enable verification mode.\n"
       "-p              Do not unpause domain after migrating it.\n"
       "-D              Preserve the domain id"



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