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authorDr. David Alan Gilbert <dgilbert@redhat.com>2016-08-24 18:15:46 +0100
committerJuan Quintela <quintela@trasno.org>2016-10-13 17:23:53 +0200
commit2ebeaec012b4e5695612774c44f14c61ab46c72c (patch)
treed7a492d4699a7240ad7ff7c5bd41bc11928a082e
parent091ecc8b69bd735383e171828d4e8ed5e34c2a3b (diff)
downloadfocaccia-qemu-2ebeaec012b4e5695612774c44f14c61ab46c72c.tar.gz
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Postcopy vs xbzrle: Don't send xbzrle pages once in postcopy [for 2.8]
xbzrle relies on reading pages that have already been sent
to the destination and then applying the modifications; we can't
do that in postcopy because the destination may well have
modified the page already or the page has been discarded.

I already didn't allow reception of xbzrle pages, but I
forgot to add the test to stop them being sent.

Enabling both xbzrle and postcopy can make some sense;
if you think that your migration might finish if you
have xbzrle, then when it doesn't complete you flick
over to postcopy and stop xbzrle'ing.

This corresponds to RH bug:
https://bugzilla.redhat.com/show_bug.cgi?id=1368422

Symptom is:

Unknown combination of migration flags: 0x60 (postcopy mode)
(either 0x60 or 0x40)

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
-rw-r--r--migration/ram.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/migration/ram.c b/migration/ram.c
index c8ec9f268f..bc6154fe34 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -771,7 +771,9 @@ static int ram_save_page(QEMUFile *f, PageSearchStatus *pss,
              * page would be stale
              */
             xbzrle_cache_zero_page(current_addr);
-        } else if (!ram_bulk_stage && migrate_use_xbzrle()) {
+        } else if (!ram_bulk_stage &&
+                   !migration_in_postcopy(migrate_get_current()) &&
+                   migrate_use_xbzrle()) {
             pages = save_xbzrle_page(f, &p, current_addr, block,
                                      offset, last_stage, bytes_transferred);
             if (!last_stage) {