KVM: Use symbolic constants instead of magic numbers

Signed-off-by: NAvi Kivity <avi@qumranet.com>

drivers/kvm/paging_tmpl.h

@@ -213,7 +213,7 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page,
 	if (~gpte & (PT_PRESENT_MASK | PT_ACCESSED_MASK))
 		return;
 	pgprintk("%s: gpte %llx spte %p\n", __FUNCTION__, (u64)gpte, spte);
-	FNAME(set_pte)(vcpu, gpte, spte, 6,
+	FNAME(set_pte)(vcpu, gpte, spte, PT_USER_MASK | PT_WRITABLE_MASK,
 		       (gpte & PT_BASE_ADDR_MASK) >> PAGE_SHIFT);
 }