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authorJan Beulich <jbeulich@suse.com>2021-02-15 10:51:07 +0300
committerJuergen Gross <jgross@suse.com>2021-02-15 10:51:07 +0300
commitdbe5283605b3bc12ca45def09cc721a0a5c853a2 (patch)
tree7159e3ada0f23155b856d63cfccfdbca2712aff5 /drivers/xen
parentb512e1b077e5ccdbd6e225b15d934ab12453b70a (diff)
downloadlinux-dbe5283605b3bc12ca45def09cc721a0a5c853a2.tar.xz
Xen/gntdev: correct dev_bus_addr handling in gntdev_map_grant_pages()
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>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/gntdev.c24
1 files changed, 13 insertions, 11 deletions
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index a36b71286bcf..aece224a4e70 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -309,18 +309,25 @@ int gntdev_map_grant_pages(struct gntdev_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);
}
}
@@ -336,17 +343,12 @@ int gntdev_map_grant_pages(struct gntdev_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;
-#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
- else if (map->dma_vaddr) {
- unsigned long bfn;
-
- bfn = pfn_to_bfn(page_to_pfn(map->pages[i]));
- map->unmap_ops[i].dev_bus_addr = __pfn_to_phys(bfn);
- }
-#endif
}
return err;
}