From 93474b25af1eabf5b14743793156e8d307bfcd6b Mon Sep 17 00:00:00 2001 From: Takuya Yoshikawa Date: Thu, 1 Mar 2012 19:34:45 +0900 Subject: 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 Signed-off-by: Avi Kivity --- virt/kvm/kvm_main.c | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) (limited to 'virt/kvm') diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index a612bc8c921c..6bd34a6ecca1 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); } } -- cgit v1.2.1