KVM: Remove unused dirty_bitmap_head and nr_dirty_pages
Now that we do neither double buffering nor heuristic selection of the
write protection method these are not needed anymore.
Note: some drivers have their own implementation of set_bit_le() and
making it generic needs a bit of work; so we use test_and_set_bit_le()
and will later replace it with generic set_bit_le().
Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a612bc8..6bd34a6 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -522,12 +522,11 @@
return;
if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE)
- vfree(memslot->dirty_bitmap_head);
+ vfree(memslot->dirty_bitmap);
else
- kfree(memslot->dirty_bitmap_head);
+ kfree(memslot->dirty_bitmap);
memslot->dirty_bitmap = NULL;
- memslot->dirty_bitmap_head = NULL;
}
/*
@@ -611,8 +610,7 @@
/*
* Allocation size is twice as large as the actual dirty bitmap size.
- * This makes it possible to do double buffering: see x86's
- * kvm_vm_ioctl_get_dirty_log().
+ * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
*/
static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
{
@@ -627,8 +625,6 @@
if (!memslot->dirty_bitmap)
return -ENOMEM;
- memslot->dirty_bitmap_head = memslot->dirty_bitmap;
- memslot->nr_dirty_pages = 0;
#endif /* !CONFIG_S390 */
return 0;
}
@@ -1476,8 +1472,8 @@
if (memslot && memslot->dirty_bitmap) {
unsigned long rel_gfn = gfn - memslot->base_gfn;
- if (!test_and_set_bit_le(rel_gfn, memslot->dirty_bitmap))
- memslot->nr_dirty_pages++;
+ /* TODO: introduce set_bit_le() and use it */
+ test_and_set_bit_le(rel_gfn, memslot->dirty_bitmap);
}
}