[Xen-devel] [PATCH 10/12] xen: introduce gnttab_map_refs and gnttab_unmap_refs

[stefano.stabellini@xxxxxxxxxxxxx]

From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

gnttab_map_refs maps some grant refs and uses the new m2p override to
set a proper m2p mapping for the granted pages.

gnttab_unmap_refs unmaps the granted refs and removes th mappings from
the m2p override.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
 drivers/xen/grant-table.c |   36 ++++++++++++++++++++++++++++++++++++
 include/xen/grant_table.h |    5 +++++
 2 files changed, 41 insertions(+), 0 deletions(-)

diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 6c45318..1afd569 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 1821aa1..b1fab6b 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__ */
-- 
1.5.6.5


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