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authorTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>2012-03-01 19:34:45 +0900
committerAvi Kivity <avi@redhat.com>2012-04-08 12:50:01 +0300
commit93474b25af1eabf5b14743793156e8d307bfcd6b (patch)
treea670a601bc0f470e95d38b84a77b0de79735b491 /virt
parent60c34612b70711fb14a8dcbc6a79509902450d2e (diff)
downloadlinux-93474b25af1eabf5b14743793156e8d307bfcd6b.tar.gz
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>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c14
1 files changed, 5 insertions, 9 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a612bc8c921..6bd34a6ecca 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -522,12 +522,11 @@ static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
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 @@ static int kvm_vm_release(struct inode *inode, struct file *filp)
/*
* 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 @@ static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
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 @@ void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
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);
}
}