diff options
| author | Annie Li <annie.li@oracle.com> | 2011-12-12 18:14:42 +0800 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-12-16 11:25:02 -0500 |
| commit | 6666754b11297526c699f8df63c52d50c24fe946 (patch) | |
| tree | cd850e009e16c4e1e64d91ab66617ac097c89104 /include | |
| parent | 9dbc71d53ce4e0260d0a8307838cd9ebddc07a12 (diff) | |
| download | linux-6666754b11297526c699f8df63c52d50c24fe946.tar.bz2 | |
xen/granttable: Support sub-page grants
- They can't be used to map the page (so can only be used in a GNTTABOP_copy
hypercall).
- It's possible to grant access with a finer granularity than whole pages.
- Xen guarantees that they can be revoked quickly (a normal map grant can
only be revoked with the cooperation of the domain which has been granted
access).
Signed-off-by: Annie Li <annie.li@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/xen/grant_table.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h index fea4954174f0..2b492b9637b3 100644 --- a/include/xen/grant_table.h +++ b/include/xen/grant_table.h @@ -62,6 +62,15 @@ int gnttab_resume(void); int gnttab_grant_foreign_access(domid_t domid, unsigned long frame, int readonly); +int gnttab_grant_foreign_access_subpage(domid_t domid, unsigned long frame, + int flags, unsigned page_off, + unsigned length); + +/* + * Are sub-page grants available on this version of Xen? Returns true if they + * are, and false if they're not. + */ +bool gnttab_subpage_grants_available(void); /* * End access through the given grant reference, iff the grant entry is no @@ -108,6 +117,10 @@ void gnttab_cancel_free_callback(struct gnttab_free_callback *callback); void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid, unsigned long frame, int readonly); +int gnttab_grant_foreign_access_subpage_ref(grant_ref_t ref, domid_t domid, + unsigned long frame, int flags, + unsigned page_off, + unsigned length); void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid, unsigned long pfn); |