KVM/VMX: Add hv tlb range flush support

This patch is to register tlb_remote_flush_with_range callback with
hv tlb range flush interface.
Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/vmx/vmx.c

@@ -421,7 +421,34 @@ static void check_ept_pointer_match(struct kvm *kvm)
 	to_kvm_vmx(kvm)->ept_pointers_match = EPT_POINTERS_MATCH;
 }
 
-static int vmx_hv_remote_flush_tlb(struct kvm *kvm)
+int kvm_fill_hv_flush_list_func(struct hv_guest_mapping_flush_list *flush,
+		void *data)
+{
+	struct kvm_tlb_range *range = data;
+
+	return hyperv_fill_flush_guest_mapping_list(flush, range->start_gfn,
+			range->pages);
+}
+
+static inline int __hv_remote_flush_tlb_with_range(struct kvm *kvm,
+		struct kvm_vcpu *vcpu, struct kvm_tlb_range *range)
+{
+	u64 ept_pointer = to_vmx(vcpu)->ept_pointer;
+
+	/*
+	 * FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE hypercall needs address
+	 * of the base of EPT PML4 table, strip off EPT configuration
+	 * information.
+	 */
+	if (range)
+		return hyperv_flush_guest_mapping_range(ept_pointer & PAGE_MASK,
+				kvm_fill_hv_flush_list_func, (void *)range);
+	else
+		return hyperv_flush_guest_mapping(ept_pointer & PAGE_MASK);
+}
+
+static int hv_remote_flush_tlb_with_range(struct kvm *kvm,
+		struct kvm_tlb_range *range)
 {
 	struct kvm_vcpu *vcpu;
 	int ret = -ENOTSUPP, i;
@@ -431,29 +458,26 @@ static int vmx_hv_remote_flush_tlb(struct kvm *kvm)
 	if (to_kvm_vmx(kvm)->ept_pointers_match == EPT_POINTERS_CHECK)
 		check_ept_pointer_match(kvm);
 
-	/*
-	 * FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE hypercall needs the address of the
-	 * base of EPT PML4 table, strip off EPT configuration information.
-	 * If ept_pointer is invalid pointer, bypass the flush request.
-	 */
 	if (to_kvm_vmx(kvm)->ept_pointers_match != EPT_POINTERS_MATCH) {
 		kvm_for_each_vcpu(i, vcpu, kvm) {
-			u64 ept_pointer = to_vmx(vcpu)->ept_pointer;
-
-			if (!VALID_PAGE(ept_pointer))
-				continue;
-
-			ret |= hyperv_flush_guest_mapping(
-				ept_pointer & PAGE_MASK);
+			/* If ept_pointer is invalid pointer, bypass flush request. */
+			if (VALID_PAGE(to_vmx(vcpu)->ept_pointer))
+				ret |= __hv_remote_flush_tlb_with_range(
+					kvm, vcpu, range);
 		}
 	} else {
-		ret = hyperv_flush_guest_mapping(
-				to_vmx(kvm_get_vcpu(kvm, 0))->ept_pointer & PAGE_MASK);
+		ret = __hv_remote_flush_tlb_with_range(kvm,
+				kvm_get_vcpu(kvm, 0), range);
 	}
 
 	spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock);
 	return ret;
 }
+static int hv_remote_flush_tlb(struct kvm *kvm)
+{
+	return hv_remote_flush_tlb_with_range(kvm, NULL);
+}
+
 #endif /* IS_ENABLED(CONFIG_HYPERV) */
 
 /*
@@ -7554,8 +7578,11 @@ static __init int hardware_setup(void)
 
 #if IS_ENABLED(CONFIG_HYPERV)
 	if (ms_hyperv.nested_features & HV_X64_NESTED_GUEST_MAPPING_FLUSH
-	    && enable_ept)
-		kvm_x86_ops->tlb_remote_flush = vmx_hv_remote_flush_tlb;
+	    && enable_ept) {
+		kvm_x86_ops->tlb_remote_flush = hv_remote_flush_tlb;
+		kvm_x86_ops->tlb_remote_flush_with_range =
+				hv_remote_flush_tlb_with_range;
+	}
 #endif
 
 	if (!cpu_has_vmx_ple()) {