Xen/gntdev: correct dev_bus_addr handling in gntdev_map_grant_pages()

commit dbe5283605b3bc12ca45def09cc721a0a5c853a2 upstream.

We may not skip setting the field in the unmap structure when
GNTMAP_device_map is in use - such an unmap would fail to release the
respective resources (a page ref in the hypervisor). Otoh the field
doesn't need setting at all when GNTMAP_device_map is not in use.

To record the value for unmapping, we also better don't use our local
p2m: In particular after a subsequent change it may not have got updated
for all the batch elements. Instead it can simply be taken from the
respective map's results.

We can additionally avoid playing this game altogether for the kernel
part of the mappings in (x86) PV mode.

This is part of XSA-361.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: stable@vger.kernel.org
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 1865bcfa869bf869e261b808fc8141a409ed8c5f..c6b29506c907d2fcf8d323aeaad038d575e4e68e 100644 (file)
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -293,18 +293,25 @@ static int map_grant_pages(struct grant_map *map)
                 * to the kernel linear addresses of the struct pages.
                 * These ptes are completely different from the user ptes dealt
                 * with find_grant_ptes.
+                * Note that GNTMAP_device_map isn't needed here: The
+                * dev_bus_addr output field gets consumed only from ->map_ops,
+                * and by not requesting it when mapping we also avoid needing
+                * to mirror dev_bus_addr into ->unmap_ops (and holding an extra
+                * reference to the page in the hypervisor).
                 */
+               unsigned int flags = (map->flags & ~GNTMAP_device_map) |
+                                    GNTMAP_host_map;
+
                for (i = 0; i < map->count; i++) {
                        unsigned long address = (unsigned long)
                                pfn_to_kaddr(page_to_pfn(map->pages[i]));
                        BUG_ON(PageHighMem(map->pages[i]));
 
-                       gnttab_set_map_op(&map->kmap_ops[i], address,
-                               map->flags | GNTMAP_host_map,
+                       gnttab_set_map_op(&map->kmap_ops[i], address, flags,
                                map->grants[i].ref,
                                map->grants[i].domid);
                        gnttab_set_unmap_op(&map->kunmap_ops[i], address,
-                               map->flags | GNTMAP_host_map, -1);
+                               flags, -1);
                }
        }
 
@@ -320,6 +327,9 @@ static int map_grant_pages(struct grant_map *map)
                        continue;
                }
 
+               if (map->flags & GNTMAP_device_map)
+                       map->unmap_ops[i].dev_bus_addr = map->map_ops[i].dev_bus_addr;
+
                map->unmap_ops[i].handle = map->map_ops[i].handle;
                if (use_ptemod)
                        map->kunmap_ops[i].handle = map->kmap_ops[i].handle;