hostmem: set MPOL_MF_MOVE

When memory is allocated on a wrong node, MPOL_MF_STRICT
doesn't move it - it just fails the allocation.
A simple way to reproduce the failure is with mlock=on
realtime feature.

The code comment actually says: "ensure policy won't be ignored"
so setting MPOL_MF_MOVE seems like a better way to do this.

Cc: qemu-stable@nongnu.org
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 288d3322022d6ad646407f3ca6f1a6a746565b9a)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

diff --git a/backends/hostmem.c b/backends/hostmem.c
index ca10c51b51403957aeec39a41a172ef877870f43..a9905c04a6428a74e63571e5dd1f6aca2c6fd6a8 100644 (file)
--- a/backends/hostmem.c
+++ b/backends/hostmem.c
@@ -304,7 +304,7 @@ host_memory_backend_memory_complete(UserCreatable *uc, Error **errp)
         /* ensure policy won't be ignored in case memory is preallocated
          * before mbind(). note: MPOL_MF_STRICT is ignored on hugepages so
          * this doesn't catch hugepage case. */
-        unsigned flags = MPOL_MF_STRICT;
+        unsigned flags = MPOL_MF_STRICT | MPOL_MF_MOVE;
 
         /* check for invalid host-nodes and policies and give more verbose
          * error messages than mbind(). */