[Qemu-devel] [PULL 22/27] postcopy: Send whole huge pages

["Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>]

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

The RAM save code uses ram_save_host_page to send whole
host pages at a time;  change this to use the host page size associated
with the RAM Block which may be a huge page.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20170224182844.32452-12-dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 migration/ram.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/migration/ram.c b/migration/ram.c
index 9f28da2..719425b 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1302,6 +1302,8 @@ static int ram_save_target_page(MigrationState *ms, QEMUFile *f,
  *                     offset to point into the middle of a host page
  *                     in which case the remainder of the hostpage is sent.
  *                     Only dirty target pages are sent.
+ *                     Note that the host page size may be a huge page for this
+ *                     block.
  *
  * Returns: Number of pages written.
  *
@@ -1320,6 +1322,8 @@ static int ram_save_host_page(MigrationState *ms, QEMUFile *f,
                               ram_addr_t dirty_ram_abs)
 {
     int tmppages, pages = 0;
+    size_t pagesize = qemu_ram_pagesize(pss->block);
+
     do {
         tmppages = ram_save_target_page(ms, f, pss, last_stage,
                                         bytes_transferred, dirty_ram_abs);
@@ -1330,7 +1334,7 @@ static int ram_save_host_page(MigrationState *ms, QEMUFile *f,
         pages += tmppages;
         pss->offset += TARGET_PAGE_SIZE;
         dirty_ram_abs += TARGET_PAGE_SIZE;
-    } while (pss->offset & (qemu_host_page_size - 1));
+    } while (pss->offset & (pagesize - 1));
 
     /* The offset we leave with is the last one we looked at */
     pss->offset -= TARGET_PAGE_SIZE;
-- 
2.9.3