Revert "vfio: VFIO_IOMMU_SET_MSI_BINDING"

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

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

This reverts commit ac16d334.
Signed-off-by: NKunkun Jiang <jiangkunkun@huawei.com>
Reviewed-by: NKeqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/vfio/vfio_iommu_type1.c

@@ -3088,41 +3088,6 @@ static int vfio_cache_inv_fn(struct device *dev, void *data)
 	return iommu_uapi_cache_invalidate(dc->domain, dev, (void __user *)arg);
 }
 
-static int
-vfio_bind_msi(struct vfio_iommu *iommu,
-	      dma_addr_t giova, phys_addr_t gpa, size_t size)
-{
-	struct vfio_domain *d;
-	int ret = 0;
-
-	mutex_lock(&iommu->lock);
-
-	list_for_each_entry(d, &iommu->domain_list, next) {
-		ret = iommu_bind_guest_msi(d->domain, giova, gpa, size);
-		if (ret)
-			goto unwind;
-	}
-	goto unlock;
-unwind:
-	list_for_each_entry_continue_reverse(d, &iommu->domain_list, next) {
-		iommu_unbind_guest_msi(d->domain, giova);
-	}
-unlock:
-	mutex_unlock(&iommu->lock);
-	return ret;
-}
-
-static void
-vfio_unbind_msi(struct vfio_iommu *iommu, dma_addr_t giova)
-{
-	struct vfio_domain *d;
-
-	mutex_lock(&iommu->lock);
-	list_for_each_entry(d, &iommu->domain_list, next)
-		iommu_unbind_guest_msi(d->domain, giova);
-	mutex_unlock(&iommu->lock);
-}
-
 static int vfio_iommu_migration_build_caps(struct vfio_iommu *iommu,
 					   struct vfio_info_cap *caps)
 {
@@ -3320,31 +3285,6 @@ static int vfio_iommu_type1_cache_invalidate(struct vfio_iommu *iommu,
 	return ret;
 }
 
-static int vfio_iommu_type1_set_msi_binding(struct vfio_iommu *iommu,
-					    unsigned long arg)
-{
-	struct vfio_iommu_type1_set_msi_binding msi_binding;
-	unsigned long minsz;
-
-	minsz = offsetofend(struct vfio_iommu_type1_set_msi_binding,
-			    size);
-
-	if (copy_from_user(&msi_binding, (void __user *)arg, minsz))
-		return -EFAULT;
-
-	if (msi_binding.argsz < minsz)
-		return -EINVAL;
-
-	if (msi_binding.flags == VFIO_IOMMU_UNBIND_MSI) {
-		vfio_unbind_msi(iommu, msi_binding.iova);
-		return 0;
-	} else if (msi_binding.flags == VFIO_IOMMU_BIND_MSI) {
-		return vfio_bind_msi(iommu, msi_binding.iova,
-				     msi_binding.gpa, msi_binding.size);
-	}
-	return -EINVAL;
-}
-
 static int vfio_iommu_type1_dirty_pages(struct vfio_iommu *iommu,
 					unsigned long arg)
 {
@@ -3654,8 +3594,6 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
 		return vfio_iommu_type1_set_pasid_table(iommu, arg);
 	case VFIO_IOMMU_CACHE_INVALIDATE:
 		return vfio_iommu_type1_cache_invalidate(iommu, arg);
-	case VFIO_IOMMU_SET_MSI_BINDING:
-		return vfio_iommu_type1_set_msi_binding(iommu, arg);
 	default:
 		return -ENOTTY;
 	}

include/uapi/linux/vfio.h

@@ -1323,26 +1323,6 @@ struct vfio_iommu_type1_cache_invalidate {
 };
 #define VFIO_IOMMU_CACHE_INVALIDATE      _IO(VFIO_TYPE, VFIO_BASE + 19)
 
-/**
- * VFIO_IOMMU_SET_MSI_BINDING - _IOWR(VFIO_TYPE, VFIO_BASE + 20,
- *			struct vfio_iommu_type1_set_msi_binding)
- *
- * Pass a stage 1 MSI doorbell mapping to the host so that this
- * latter can build a nested stage2 mapping. Or conversely tear
- * down a previously bound stage 1 MSI binding.
- */
-struct vfio_iommu_type1_set_msi_binding {
-	__u32   argsz;
-	__u32   flags;
-#define VFIO_IOMMU_BIND_MSI	(1 << 0)
-#define VFIO_IOMMU_UNBIND_MSI	(1 << 1)
-	__u64	iova;	/* MSI guest IOVA */
-	/* Fields below are used on BIND */
-	__u64	gpa;	/* MSI guest physical address */
-	__u64	size;	/* size of stage1 mapping (bytes) */
-};
-#define VFIO_IOMMU_SET_MSI_BINDING      _IO(VFIO_TYPE, VFIO_BASE + 20)
-
 /* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */
 
 /*