diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 8573895bc68a3c3da81090f90f6bfdf6aa07f771..a00e75642e9bc3d3deebe0c10360185b60383b07 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2424,6 +2424,43 @@ static void __iommu_detach_device(struct iommu_domain *domain,
 	trace_detach_device_from_domain(dev);
 }
 
+/**
+ * iommu_bind_guest_msi - Passes the stage1 GIOVA/GPA mapping of a
+ * virtual doorbell
+ *
+ * @domain: iommu domain the stage 1 mapping will be attached to
+ * @iova: iova allocated by the guest
+ * @gpa: guest physical address of the virtual doorbell
+ * @size: granule size used for the mapping
+ *
+ * The associated IOVA can be reused by the host to create a nested
+ * stage2 binding mapping translating into the physical doorbell used
+ * by the devices attached to the domain.
+ *
+ * All devices within the domain must share the same physical doorbell.
+ * A single MSI GIOVA/GPA mapping can be attached to an iommu_domain.
+ */
+
+int iommu_bind_guest_msi(struct iommu_domain *domain,
+			 dma_addr_t giova, phys_addr_t gpa, size_t size)
+{
+	if (unlikely(!domain->ops->bind_guest_msi))
+		return -ENODEV;
+
+	return domain->ops->bind_guest_msi(domain, giova, gpa, size);
+}
+EXPORT_SYMBOL_GPL(iommu_bind_guest_msi);
+
+void iommu_unbind_guest_msi(struct iommu_domain *domain,
+			    dma_addr_t giova)
+{
+	if (unlikely(!domain->ops->unbind_guest_msi))
+		return;
+
+	domain->ops->unbind_guest_msi(domain, giova);
+}
+EXPORT_SYMBOL_GPL(iommu_unbind_guest_msi);
+
 void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
 {
 	struct iommu_group *group;
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index e8d4c8bf4113cc8070ca488aac7ad832eeaeafba..a192246678f5125e08b2a8ce273803f7d0a0ec91 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -245,6 +245,8 @@ struct iommu_iotlb_gather {
  * @sva_unbind_gpasid: unbind guest pasid and mm
  * @attach_pasid_table: attach a pasid table
  * @detach_pasid_table: detach the pasid table
+ * @bind_guest_msi: provides a stage1 giova/gpa MSI doorbell mapping
+ * @unbind_guest_msi: withdraw a stage1 giova/gpa MSI doorbell mapping
  * @def_domain_type: device default domain type, return value:
  *		- IOMMU_DOMAIN_IDENTITY: must use an identity domain
  *		- IOMMU_DOMAIN_DMA: must use a dma domain
@@ -342,6 +344,10 @@ struct iommu_ops {
 
 	int (*def_domain_type)(struct device *dev);
 
+	int (*bind_guest_msi)(struct iommu_domain *domain,
+			      dma_addr_t giova, phys_addr_t gpa, size_t size);
+	void (*unbind_guest_msi)(struct iommu_domain *domain, dma_addr_t giova);
+
 	unsigned long pgsize_bitmap;
 	struct module *owner;
 };
@@ -487,6 +493,10 @@ extern int iommu_attach_pasid_table(struct iommu_domain *domain,
 extern int iommu_uapi_attach_pasid_table(struct iommu_domain *domain,
 					 void __user *udata);
 extern void iommu_detach_pasid_table(struct iommu_domain *domain);
+extern int iommu_bind_guest_msi(struct iommu_domain *domain,
+				dma_addr_t giova, phys_addr_t gpa, size_t size);
+extern void iommu_unbind_guest_msi(struct iommu_domain *domain,
+				   dma_addr_t giova);
 extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
 extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
 extern size_t iommu_pgsize(struct iommu_domain *domain,
@@ -1193,6 +1203,14 @@ iommu_sva_bind_group(struct iommu_group *group, struct mm_struct *mm,
 	return NULL;
 }
 
+int iommu_bind_guest_msi(struct iommu_domain *domain,
+			 dma_addr_t giova, phys_addr_t gpa, size_t size)
+{
+	return -ENODEV;
+}
+static inline
+void iommu_unbind_guest_msi(struct iommu_domain *domain, dma_addr_t giova) {}
+
 #endif /* CONFIG_IOMMU_API */
 
 /**