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authorShameer Kolothum <shameerali.kolothum.thodi@huawei.com>2019-07-23 17:06:34 +0100
committerAlex Williamson <alex.williamson@redhat.com>2019-08-19 13:25:03 -0600
commitf45daadfe1add9f468f3ae1f7e2d9b235fe80748 (patch)
tree0037f2f129368b7dd6a84a0d32a3471b326f4250 /drivers/vfio
parentaf029169b8fdae31064624d60b5469a3da95ad32 (diff)
downloadlinux-f45daadfe1add9f468f3ae1f7e2d9b235fe80748.tar.bz2
vfio/type1: Update iova list on detach
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@huawei.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/vfio_iommu_type1.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index a3c9794ccf83..7005a8cfca1b 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1867,12 +1867,93 @@ 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;
+ dma_addr_t start = 0;
+ dma_addr_t end = (dma_addr_t)~0;
+
+ if (list_empty(iova_copy))
+ return;
+
+ 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;
+ dma_addr_t start, end;
+ LIST_HEAD(resv_regions);
+ int ret;
+
+ if (list_empty(iova_copy))
+ return -EINVAL;
+
+ list_for_each_entry(d, &iommu->domain_list, next) {
+ list_for_each_entry(g, &d->group_list, next) {
+ ret = iommu_get_group_resv_regions(g->iommu_group,
+ &resv_regions);
+ if (ret)
+ goto done;
+ }
+ }
+
+ 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 */
+ vfio_iommu_iova_free(iova_copy);
+
+ 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:
+ vfio_iommu_resv_free(&resv_regions);
+ 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;
+ LIST_HEAD(iova_copy);
mutex_lock(&iommu->lock);
@@ -1895,6 +1976,13 @@ static void vfio_iommu_type1_detach_group(void *iommu_data,
}
}
+ /*
+ * Get a copy of iova list. This will be used to update
+ * and to replace the current one later. Please note that
+ * we will leave the original list as it is if update fails.
+ */
+ vfio_iommu_iova_get_copy(iommu, &iova_copy);
+
list_for_each_entry(domain, &iommu->domain_list, next) {
group = find_iommu_group(domain, iommu_group);
if (!group)
@@ -1920,10 +2008,16 @@ static void vfio_iommu_type1_detach_group(void *iommu_data,
iommu_domain_free(domain->domain);
list_del(&domain->next);
kfree(domain);
+ vfio_iommu_aper_expand(iommu, &iova_copy);
}
break;
}
+ if (!vfio_iommu_resv_refresh(iommu, &iova_copy))
+ vfio_iommu_iova_insert_copy(iommu, &iova_copy);
+ else
+ vfio_iommu_iova_free(&iova_copy);
+
detach_group_done:
mutex_unlock(&iommu->lock);
}