Revert "iommu: Introduce bind/unbind_guest_msi"

virt inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I61SPO
CVE: NA

--------------------------------

This reverts commit 9db83ab7.
Signed-off-by: NKunkun Jiang <jiangkunkun@huawei.com>
Reviewed-by: NKeqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/iommu/iommu.c

@@ -2383,43 +2383,6 @@ 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;

include/linux/iommu.h

@@ -248,8 +248,6 @@ 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
@@ -347,10 +345,6 @@ 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);
-
 	int (*dev_get_config)(struct device *dev, int type, void *data);
 	int (*dev_set_config)(struct device *dev, int type, void *data);
 
@@ -507,10 +501,6 @@ 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,
@@ -1221,14 +1211,6 @@ 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) {}
-
 static inline
 int iommu_dev_set_config(struct device *dev, int type, void *data)
 {