[PATCH] migration: only check page size match if RAM postcopy is enabled

[Stefan Reiter <s.reiter@proxmox.com>]

Postcopy may also be advised for dirty-bitmap migration only, in which
case the remote page size will not be available and we'll instead read
bogus data, blocking migration with a mismatch error if the VM uses
hugepages.

Fixes: 58110f0acb ("migration: split common postcopy out of ram postcopy")
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
---
 migration/ram.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/migration/ram.c b/migration/ram.c
index 7811cde643..6ace15261c 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -3521,7 +3521,7 @@ static int ram_load_precopy(QEMUFile *f)
                         }
                     }
                     /* For postcopy we need to check hugepage sizes match */
-                    if (postcopy_advised &&
+                    if (postcopy_advised && migrate_postcopy_ram() &&
                         block->page_size != qemu_host_page_size) {
                         uint64_t remote_page_size = qemu_get_be64(f);
                         if (remote_page_size != block->page_size) {
-- 
2.20.1