kvm: simplify kvm_clear_guest_page()
Use kvm_write_guest_page() with empty_zero_page, instead of doing
kmap and memset.
Signed-off-by: Izik Eidus <izike@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index bda733a..6c2c8e3 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -633,22 +633,7 @@
int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
{
- void *page_virt;
- struct page *page;
-
- page = gfn_to_page(kvm, gfn);
- if (is_error_page(page)) {
- kvm_release_page(page);
- return -EFAULT;
- }
- page_virt = kmap_atomic(page, KM_USER0);
-
- memset(page_virt + offset, 0, len);
-
- kunmap_atomic(page_virt, KM_USER0);
- kvm_release_page(page);
- mark_page_dirty(kvm, gfn);
- return 0;
+ return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
}
EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
