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| author | Jennifer Herbert <jennifer.herbert@citrix.com> | 2014-12-24 15:17:06 +0100 |
|---|---|---|
| committer | David Vrabel <david.vrabel@citrix.com> | 2015-01-28 15:03:12 +0100 |
| commit | 8da7633f168b5428e2cfb7342408b2c44088f5df (patch) | |
| tree | 33e17f065d1aa9bf8a57ac03b737154bac0d3468 /include/xen | |
| parent | xen/grant-table: add helpers for allocating pages (diff) | |
| download | linux-8da7633f168b5428e2cfb7342408b2c44088f5df.tar.xz linux-8da7633f168b5428e2cfb7342408b2c44088f5df.zip | |
xen: mark grant mapped pages as foreign
Use the "foreign" page flag to mark pages that have a grant map. Use
page->private to store information of the grant (the granting domain
and the grant reference).
Signed-off-by: Jennifer Herbert <jennifer.herbert@citrix.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Diffstat (limited to 'include/xen')
| -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__ */ |