KVM: introduce gfn_to_pfn_memslot_atomic

It can instead of hva_to_pfn_atomic

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 9651c2cd..5548971 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2510,15 +2510,12 @@
 				     bool no_dirty_log)
 {
 	struct kvm_memory_slot *slot;
-	unsigned long hva;
 
 	slot = gfn_to_memslot_dirty_bitmap(vcpu, gfn, no_dirty_log);
 	if (!slot)
 		return KVM_PFN_ERR_FAULT;
 
-	hva = gfn_to_hva_memslot(slot, gfn);
-
-	return hva_to_pfn_atomic(hva);
+	return gfn_to_pfn_memslot_atomic(slot, gfn);
 }
 
 static int direct_pte_prefetch_many(struct kvm_vcpu *vcpu,