[PATCH 5.5 220/367] xen/gntdev: Do not use mm notifiers with autotranslating guests

[Greg Kroah-Hartman]

From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>

commit 9293724192a73f49c722e9685d45649c6df67dfe upstream.

Commit d3eeb1d77c5d ("xen/gntdev: use mmu_interval_notifier_insert")
missed a test for use_ptemod when calling mmu_interval_read_begin(). Fix
that.

Fixes: d3eeb1d77c5d ("xen/gntdev: use mmu_interval_notifier_insert")
CC: stable@xxxxxxxxxxxxxxx # 5.5
Reported-by: Ilpo JÃrvinen <ilpo.jarvinen@xxxxxxxxxxxxxx>
Tested-by: Ilpo JÃrvinen <ilpo.jarvinen@xxxxxxxxxxxxxx>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Acked-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/xen/gntdev.c |   24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -1006,19 +1006,19 @@ static int gntdev_mmap(struct file *flip
 	}
 	mutex_unlock(&priv->lock);
 
-	/*
-	 * gntdev takes the address of the PTE in find_grant_ptes() and passes
-	 * it to the hypervisor in gntdev_map_grant_pages(). The purpose of
-	 * the notifier is to prevent the hypervisor pointer to the PTE from
-	 * going stale.
-	 *
-	 * Since this vma's mappings can't be touched without the mmap_sem,
-	 * and we are holding it now, there is no need for the notifier_range
-	 * locking pattern.
-	 */
-	mmu_interval_read_begin(&map->notifier);
-
 	if (use_ptemod) {
+		/*
+		 * gntdev takes the address of the PTE in find_grant_ptes() and
+		 * passes it to the hypervisor in gntdev_map_grant_pages(). The
+		 * purpose of the notifier is to prevent the hypervisor pointer
+		 * to the PTE from going stale.
+		 *
+		 * Since this vma's mappings can't be touched without the
+		 * mmap_sem, and we are holding it now, there is no need for
+		 * the notifier_range locking pattern.
+		 */
+		mmu_interval_read_begin(&map->notifier);
+
 		map->pages_vm_start = vma->vm_start;
 		err = apply_to_page_range(vma->vm_mm, vma->vm_start,
 					  vma->vm_end - vma->vm_start,