diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 0167996..c97573a 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -31,6 +31,7 @@
 #include <linux/rbtree.h>
 #include <linux/sched/signal.h>
 #include <linux/sched/mm.h>
+#include <linux/kthread.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 #include <linux/vfio.h>
@@ -75,6 +76,7 @@ struct vfio_iommu {
 	bool			dirty_page_tracking;
 	bool			pinned_page_dirty_scope;
 	bool			controlled;
+	wait_queue_head_t	vaddr_wait;
 };
 
 struct vfio_domain {
@@ -145,6 +147,8 @@ struct vfio_regions {
 #define DIRTY_BITMAP_PAGES_MAX	 ((u64)INT_MAX)
 #define DIRTY_BITMAP_SIZE_MAX	 DIRTY_BITMAP_BYTES(DIRTY_BITMAP_PAGES_MAX)
 
+#define WAITED 1
+
 static int put_pfn(unsigned long pfn, int prot);
 
 static struct vfio_group *vfio_iommu_find_iommu_group(struct vfio_iommu *iommu,
@@ -505,6 +509,52 @@ static int vaddr_get_pfn(struct mm_struct *mm, unsigned long vaddr,
 }
 
 /*
+ * Wait for vaddr of *dma_p to become valid.  iommu lock is dropped if the task
+ * waits, but is re-locked on return.  If the task waits, then return an updated
+ * dma struct in *dma_p.  Return 0 on success with no waiting, 1 on success if
+ * waited, and -errno on error.
+ */
+static int vfio_vaddr_wait(struct vfio_iommu *iommu, struct vfio_dma **dma_p)
+{
+	struct vfio_dma *dma = *dma_p;
+	unsigned long iova = dma->iova;
+	size_t size = dma->size;
+	int ret = 0;
+	DEFINE_WAIT(wait);
+
+	while (!dma->vaddr_valid) {
+		ret = WAITED;
+		prepare_to_wait(&iommu->vaddr_wait, &wait, TASK_KILLABLE);
+		mutex_unlock(&iommu->lock);
+		schedule();
+		mutex_lock(&iommu->lock);
+		finish_wait(&iommu->vaddr_wait, &wait);
+		if (kthread_should_stop() || !iommu->controlled ||
+		    fatal_signal_pending(current)) {
+			return -EFAULT;
+		}
+		*dma_p = dma = vfio_find_dma(iommu, iova, size);
+		if (!dma)
+			return -EINVAL;
+	}
+	return ret;
+}
+
+/*
+ * Find dma struct and wait for its vaddr to be valid.  iommu lock is dropped
+ * if the task waits, but is re-locked on return.  Return result in *dma_p.
+ * Return 0 on success, 1 on success if waited,  and -errno on error.
+ */
+static int vfio_find_vaddr(struct vfio_iommu *iommu, dma_addr_t start,
+			   size_t size, struct vfio_dma **dma_p)
+{
+	*dma_p = vfio_find_dma(iommu, start, size);
+	if (!*dma_p)
+		return -EINVAL;
+	return vfio_vaddr_wait(iommu, dma_p);
+}
+
+/*
  * Attempt to pin pages.  We really don't want to track all the pfns and
  * the iommu can only map chunks of consecutive pfns anyway, so get the
  * first page and all consecutive pages with the same locking.
@@ -693,11 +743,11 @@ static int vfio_iommu_type1_pin_pages(void *iommu_data,
 		struct vfio_pfn *vpfn;
 
 		iova = user_pfn[i] << PAGE_SHIFT;
-		dma = vfio_find_dma(iommu, iova, PAGE_SIZE);
-		if (!dma) {
-			ret = -EINVAL;
+		ret = vfio_find_vaddr(iommu, iova, PAGE_SIZE, &dma);
+		if (ret < 0)
 			goto pin_unwind;
-		}
+		else if (ret == WAITED)
+			do_accounting = !IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu);
 
 		if ((dma->prot & prot) != prot) {
 			ret = -EPERM;
@@ -1496,6 +1546,22 @@ static int vfio_iommu_replay(struct vfio_iommu *iommu,
 	unsigned long limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
 	int ret;
 
+	/*
+	 * Wait for all vaddr to be valid so they can be used in the main loop.
+	 * If we do wait, the lock was dropped and re-taken, so start over to
+	 * ensure the dma list is consistent.
+	 */
+again:
+	for (n = rb_first(&iommu->dma_list); n; n = rb_next(n)) {
+		struct vfio_dma *dma = rb_entry(n, struct vfio_dma, node);
+
+		ret = vfio_vaddr_wait(iommu, &dma);
+		if (ret < 0)
+			return ret;
+		else if (ret == WAITED)
+			goto again;
+	}
+
 	/* Arbitrarily pick the first domain in the list for lookups */
 	if (!list_empty(&iommu->domain_list))
 		d = list_first_entry(&iommu->domain_list,
@@ -2522,6 +2588,7 @@ static void *vfio_iommu_type1_open(unsigned long arg)
 	iommu->controlled = true;
 	mutex_init(&iommu->lock);
 	BLOCKING_INIT_NOTIFIER_HEAD(&iommu->notifier);
+	init_waitqueue_head(&iommu->vaddr_wait);
 
 	return iommu;
 }
@@ -2972,12 +3039,13 @@ static int vfio_iommu_type1_dma_rw_chunk(struct vfio_iommu *iommu,
 	struct vfio_dma *dma;
 	bool kthread = current->mm == NULL;
 	size_t offset;
+	int ret;
 
 	*copied = 0;
 
-	dma = vfio_find_dma(iommu, user_iova, 1);
-	if (!dma)
-		return -EINVAL;
+	ret = vfio_find_vaddr(iommu, user_iova, 1, &dma);
+	if (ret < 0)
+		return ret;
 
 	if ((write && !(dma->prot & IOMMU_WRITE)) ||
 			!(dma->prot & IOMMU_READ))
@@ -3055,6 +3123,7 @@ static void vfio_iommu_type1_notify(void *iommu_data, unsigned int event,
 	mutex_lock(&iommu->lock);
 	iommu->controlled = false;
 	mutex_unlock(&iommu->lock);
+	wake_up_all(&iommu->vaddr_wait);
 }
 
 static const struct vfio_iommu_driver_ops vfio_iommu_driver_ops_type1 = {
