[PATCH v3 3/6] vfio/type1: Update iova list on detach

[Shameer Kolothum]

Get a copy of iova list on _group_detach and try to update the list.
On success replace the current one with the copy. Leave the list as
it is if update fails.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@xxxxxxxxxx>
---
 drivers/vfio/vfio_iommu_type1.c | 103 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 4db87a9..8d8ddd7 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1646,12 +1646,96 @@ static void vfio_sanity_check_pfn_list(struct vfio_iommu *iommu)
 	WARN_ON(iommu->notifier.head);
 }
 
+/*
+ * Called when a domain is removed in detach. It is possible that
+ * the removed domain decided the iova aperture window. Modify the
+ * iova aperture with the smallest window among existing domains.
+ */
+static void vfio_iommu_aper_expand(struct vfio_iommu *iommu,
+				   struct list_head *iova_copy)
+{
+	struct vfio_domain *domain;
+	struct iommu_domain_geometry geo;
+	struct vfio_iova *node;
+	phys_addr_t start = 0;
+	phys_addr_t end = (phys_addr_t)~0;
+
+	list_for_each_entry(domain, &iommu->domain_list, next) {
+		iommu_domain_get_attr(domain->domain, DOMAIN_ATTR_GEOMETRY,
+				      &geo);
+		if (geo.aperture_start > start)
+			start = geo.aperture_start;
+		if (geo.aperture_end < end)
+			end = geo.aperture_end;
+	}
+
+	/* Modify aperture limits. The new aper is either same or bigger */
+	node = list_first_entry(iova_copy, struct vfio_iova, list);
+	node->start = start;
+	node = list_last_entry(iova_copy, struct vfio_iova, list);
+	node->end = end;
+}
+
+/*
+ * Called when a group is detached. The reserved regions for that
+ * group can be part of valid iova now. But since reserved regions
+ * may be duplicated among groups, populate the iova valid regions
+ * list again.
+ */
+static int vfio_iommu_resv_refresh(struct vfio_iommu *iommu,
+				   struct list_head *iova_copy)
+{
+	struct vfio_domain *d;
+	struct vfio_group *g;
+	struct vfio_iova *node, *tmp;
+	struct iommu_resv_region *resv, *resv_next;
+	struct list_head resv_regions;
+	phys_addr_t start, end;
+	int ret;
+
+	INIT_LIST_HEAD(&resv_regions);
+
+	list_for_each_entry(d, &iommu->domain_list, next) {
+		list_for_each_entry(g, &d->group_list, next)
+			iommu_get_group_resv_regions(g->iommu_group,
+							 &resv_regions);
+	}
+
+	if (list_empty(&resv_regions))
+		return 0;
+
+	node = list_first_entry(iova_copy, struct vfio_iova, list);
+	start = node->start;
+	node = list_last_entry(iova_copy, struct vfio_iova, list);
+	end = node->end;
+
+	/* purge the iova list and create new one */
+	list_for_each_entry_safe(node, tmp, iova_copy, list) {
+		list_del(&node->list);
+		kfree(node);
+	}
+
+	ret = vfio_iommu_aper_resize(iova_copy, start, end);
+	if (ret)
+		goto done;
+
+	/* Exclude current reserved regions from iova ranges */
+	ret = vfio_iommu_resv_exclude(iova_copy, &resv_regions);
+done:
+	list_for_each_entry_safe(resv, resv_next, &resv_regions, list)
+		kfree(resv);
+	return ret;
+}
+
 static void vfio_iommu_type1_detach_group(void *iommu_data,
 					  struct iommu_group *iommu_group)
 {
 	struct vfio_iommu *iommu = iommu_data;
 	struct vfio_domain *domain;
 	struct vfio_group *group;
+	struct list_head iova_copy;
+	struct vfio_iova *iova, *iova_next;
+	bool iova_copy_fail;
 
 	mutex_lock(&iommu->lock);
 
@@ -1674,6 +1758,13 @@ static void vfio_iommu_type1_detach_group(void *iommu_data,
 		}
 	}
 
+	/*
+	 * Get a copy of iova list. If success, use copy to update the
+	 * list and to replace the current one.
+	 */
+	INIT_LIST_HEAD(&iova_copy);
+	iova_copy_fail = !!vfio_iommu_get_iova_copy(iommu, &iova_copy);
+
 	list_for_each_entry(domain, &iommu->domain_list, next) {
 		group = find_iommu_group(domain, iommu_group);
 		if (!group)
@@ -1699,10 +1790,22 @@ static void vfio_iommu_type1_detach_group(void *iommu_data,
 			iommu_domain_free(domain->domain);
 			list_del(&domain->next);
 			kfree(domain);
+			if (!iova_copy_fail)
+				vfio_iommu_aper_expand(iommu, &iova_copy);
 		}
 		break;
 	}
 
+	if (!iova_copy_fail) {
+		if (!vfio_iommu_resv_refresh(iommu, &iova_copy)) {
+			/* Delete the current one and insert new iova list */
+			vfio_iommu_insert_iova_copy(iommu, &iova_copy);
+			goto detach_group_done;
+		}
+	}
+
+	list_for_each_entry_safe(iova, iova_next, &iova_copy, list)
+		kfree(iova);
 detach_group_done:
 	mutex_unlock(&iommu->lock);
 }
-- 
2.7.4