KVM: s390: Add proper dirty bitmap support to S390 kvm.

Replace the kvm_s390_sync_dirty_log() stub with code to construct the KVM
dirty_bitmap from S390 memory change bits.  Also add code to properly clear
the dirty_bitmap size when clearing the bitmap.

Signed-off-by: Jason J. Herne <jjherne@us.ibm.com>
CC: Dominik Dingel <dingel@linux.vnet.ibm.com>
[Dominik Dingel: use gmap_test_and_clear_dirty, locking fixes]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 56baae8c2f56..7facdb1f1374 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -637,14 +637,12 @@ static int kvm_vm_release(struct inode *inode, struct file *filp)
  */
 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
 {
-#ifndef CONFIG_S390
         unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
 
         memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes);
         if (!memslot->dirty_bitmap)
                 return -ENOMEM;
 
-#endif /* !CONFIG_S390 */
         return 0;
 }