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>

1 files changed, 2 insertions, 16 deletions

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 595ed323fc53..e83a178dc80f 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -46,6 +46,7 @@
 #include <asm/io.h>
 #include <asm/uaccess.h>
 #include <asm/desc.h>
+#include <asm/pgtable.h>
 
 MODULE_AUTHOR("Qumranet");
 MODULE_LICENSE("GPL");
@@ -633,22 +634,7 @@ int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 
 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);