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-rw-r--r--drivers/xen/grant-table.c36
-rw-r--r--include/xen/grant_table.h5
2 files changed, 41 insertions, 0 deletions
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 6c453181649..1afd5690858 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -447,6 +447,42 @@ unsigned int gnttab_max_grant_frames(void)
}
EXPORT_SYMBOL_GPL(gnttab_max_grant_frames);
+int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
+ struct page **pages, unsigned int count)
+{
+ int i, ret;
+ pte_t *pte;
+ unsigned long mfn;
+
+ ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, map_ops, count);
+
+ for (i = 0; i < count; i++) {
+ /* m2p override only supported for GNTMAP_contains_pte mappings */
+ if (!(map_ops[i].flags & GNTMAP_contains_pte))
+ continue;
+ pte = (pte_t *) (mfn_to_virt(PFN_DOWN(map_ops[i].host_addr)) +
+ (map_ops[i].host_addr & ~PAGE_MASK));
+ mfn = pte_mfn(*pte);
+ m2p_add_override(mfn, pages[i]);
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(gnttab_map_refs);
+
+int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
+ struct page **pages, unsigned int count)
+{
+ int i, ret;
+
+ ret = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap_ops, count);
+ for (i = 0; i < count; i++)
+ m2p_remove_override(pages[i]);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(gnttab_unmap_refs);
+
static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
{
struct gnttab_setup_table setup;
diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h
index 1821aa103d8..b1fab6b5b3e 100644
--- a/include/xen/grant_table.h
+++ b/include/xen/grant_table.h
@@ -155,4 +155,9 @@ unsigned int gnttab_max_grant_frames(void);
#define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr))
+int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
+ struct page **pages, unsigned int count);
+int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
+ struct page **pages, unsigned int count);
+
#endif /* __ASM_GNTTAB_H__ */