[Xen-devel] [PATCHv4 14/14] xen/gntdev: provide find_special_page VMA operation

[David Vrabel <david.vrabel@xxxxxxxxxx>]

For a PV guest, use the find_special_page op to find the right page.
To handle VMAs being split, remember the start of the original VMA so
the correct index in the pages array can be calculated.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 drivers/xen/gntdev.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 8ea10eb..826e731 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -93,6 +93,7 @@ struct grant_map {
        struct gnttab_map_grant_ref   *kmap_ops;
        struct gnttab_unmap_grant_ref *kunmap_ops;
        struct page **pages;
+       unsigned long pages_vm_start;
 };
 
 static int unmap_grant_pages(struct grant_map *map, int offset, int pages);
@@ -444,9 +445,18 @@ static void gntdev_vma_close(struct vm_area_struct *vma)
        gntdev_put_map(priv, map);
 }
 
+static struct page *gntdev_vma_find_special_page(struct vm_area_struct *vma,
+                                                unsigned long addr)
+{
+       struct grant_map *map = vma->vm_private_data;
+
+       return map->pages[(addr - map->pages_vm_start) >> PAGE_SHIFT];
+}
+
 static struct vm_operations_struct gntdev_vmops = {
        .open = gntdev_vma_open,
        .close = gntdev_vma_close,
+       .find_special_page = gntdev_vma_find_special_page,
 };
 
 /* ------------------------------------------------------------------ */
@@ -870,6 +880,8 @@ static int gntdev_mmap(struct file *flip, struct 
vm_area_struct *vma)
                                            vma->vm_end - vma->vm_start,
                                            set_grant_ptes_as_special, NULL);
                }
+
+               map->pages_vm_start = vma->vm_start;
        }
 
        return 0;
-- 
1.7.10.4


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