diff options
Diffstat (limited to 'include/xen/grant_table.h')
| -rw-r--r-- | include/xen/grant_table.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h index 949803e20872..d3bef563e8da 100644 --- a/include/xen/grant_table.h +++ b/include/xen/grant_table.h @@ -45,6 +45,8 @@ #include <asm/xen/hypervisor.h> #include <xen/features.h> +#include <linux/mm_types.h> +#include <linux/page-flags.h> #define GNTTAB_RESERVED_XENSTORE 1 @@ -185,4 +187,22 @@ int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops, void gnttab_batch_map(struct gnttab_map_grant_ref *batch, unsigned count); void gnttab_batch_copy(struct gnttab_copy *batch, unsigned count); + +struct xen_page_foreign { + domid_t domid; + grant_ref_t gref; +}; + +static inline struct xen_page_foreign *xen_page_foreign(struct page *page) +{ + if (!PageForeign(page)) + return NULL; +#if BITS_PER_LONG < 64 + return (struct xen_page_foreign *)page->private; +#else + BUILD_BUG_ON(sizeof(struct xen_page_foreign) > BITS_PER_LONG); + return (struct xen_page_foreign *)&page->private; +#endif +} + #endif /* __ASM_GNTTAB_H__ */ |