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path: root/drivers/xen/grant-table.c
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Diffstat (limited to 'drivers/xen/grant-table.c')
-rw-r--r--drivers/xen/grant-table.c150
1 files changed, 0 insertions, 150 deletions
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 65c4bdb0b463..db6a1b9efd11 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -122,29 +122,6 @@ struct gnttab_ops {
* by bit operations.
*/
int (*query_foreign_access)(grant_ref_t ref);
- /*
- * Grant a domain to access a range of bytes within the page referred by
- * an available grant entry. Ref parameter is reference of a grant entry
- * which will be sub-page accessed, domid is id of grantee domain, frame
- * is frame address of subpage grant, flags is grant type and flag
- * information, page_off is offset of the range of bytes, and length is
- * length of bytes to be accessed.
- */
- void (*update_subpage_entry)(grant_ref_t ref, domid_t domid,
- unsigned long frame, int flags,
- unsigned page_off, unsigned length);
- /*
- * Redirect an available grant entry on domain A to another grant
- * reference of domain B, then allow domain C to use grant reference
- * of domain B transitively. Ref parameter is an available grant entry
- * reference on domain A, domid is id of domain C which accesses grant
- * entry transitively, flags is grant type and flag information,
- * trans_domid is id of domain B whose grant entry is finally accessed
- * transitively, trans_gref is grant entry transitive reference of
- * domain B.
- */
- void (*update_trans_entry)(grant_ref_t ref, domid_t domid, int flags,
- domid_t trans_domid, grant_ref_t trans_gref);
};
struct unmap_refs_callback_data {
@@ -292,122 +269,6 @@ int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
}
EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access);
-static void gnttab_update_subpage_entry_v2(grant_ref_t ref, domid_t domid,
- unsigned long frame, int flags,
- unsigned page_off, unsigned length)
-{
- gnttab_shared.v2[ref].sub_page.frame = frame;
- gnttab_shared.v2[ref].sub_page.page_off = page_off;
- gnttab_shared.v2[ref].sub_page.length = length;
- gnttab_shared.v2[ref].hdr.domid = domid;
- wmb();
- gnttab_shared.v2[ref].hdr.flags =
- GTF_permit_access | GTF_sub_page | flags;
-}
-
-int gnttab_grant_foreign_access_subpage_ref(grant_ref_t ref, domid_t domid,
- unsigned long frame, int flags,
- unsigned page_off,
- unsigned length)
-{
- if (flags & (GTF_accept_transfer | GTF_reading |
- GTF_writing | GTF_transitive))
- return -EPERM;
-
- if (gnttab_interface->update_subpage_entry == NULL)
- return -ENOSYS;
-
- gnttab_interface->update_subpage_entry(ref, domid, frame, flags,
- page_off, length);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_subpage_ref);
-
-int gnttab_grant_foreign_access_subpage(domid_t domid, unsigned long frame,
- int flags, unsigned page_off,
- unsigned length)
-{
- int ref, rc;
-
- ref = get_free_entries(1);
- if (unlikely(ref < 0))
- return -ENOSPC;
-
- rc = gnttab_grant_foreign_access_subpage_ref(ref, domid, frame, flags,
- page_off, length);
- if (rc < 0) {
- put_free_entry(ref);
- return rc;
- }
-
- return ref;
-}
-EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_subpage);
-
-bool gnttab_subpage_grants_available(void)
-{
- return gnttab_interface->update_subpage_entry != NULL;
-}
-EXPORT_SYMBOL_GPL(gnttab_subpage_grants_available);
-
-static void gnttab_update_trans_entry_v2(grant_ref_t ref, domid_t domid,
- int flags, domid_t trans_domid,
- grant_ref_t trans_gref)
-{
- gnttab_shared.v2[ref].transitive.trans_domid = trans_domid;
- gnttab_shared.v2[ref].transitive.gref = trans_gref;
- gnttab_shared.v2[ref].hdr.domid = domid;
- wmb();
- gnttab_shared.v2[ref].hdr.flags =
- GTF_permit_access | GTF_transitive | flags;
-}
-
-int gnttab_grant_foreign_access_trans_ref(grant_ref_t ref, domid_t domid,
- int flags, domid_t trans_domid,
- grant_ref_t trans_gref)
-{
- if (flags & (GTF_accept_transfer | GTF_reading |
- GTF_writing | GTF_sub_page))
- return -EPERM;
-
- if (gnttab_interface->update_trans_entry == NULL)
- return -ENOSYS;
-
- gnttab_interface->update_trans_entry(ref, domid, flags, trans_domid,
- trans_gref);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_trans_ref);
-
-int gnttab_grant_foreign_access_trans(domid_t domid, int flags,
- domid_t trans_domid,
- grant_ref_t trans_gref)
-{
- int ref, rc;
-
- ref = get_free_entries(1);
- if (unlikely(ref < 0))
- return -ENOSPC;
-
- rc = gnttab_grant_foreign_access_trans_ref(ref, domid, flags,
- trans_domid, trans_gref);
- if (rc < 0) {
- put_free_entry(ref);
- return rc;
- }
-
- return ref;
-}
-EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_trans);
-
-bool gnttab_trans_grants_available(void)
-{
- return gnttab_interface->update_trans_entry != NULL;
-}
-EXPORT_SYMBOL_GPL(gnttab_trans_grants_available);
-
static int gnttab_query_foreign_access_v1(grant_ref_t ref)
{
return gnttab_shared.v1[ref].flags & (GTF_reading|GTF_writing);
@@ -1296,8 +1157,6 @@ static const struct gnttab_ops gnttab_v2_ops = {
.end_foreign_access_ref = gnttab_end_foreign_access_ref_v2,
.end_foreign_transfer_ref = gnttab_end_foreign_transfer_ref_v2,
.query_foreign_access = gnttab_query_foreign_access_v2,
- .update_subpage_entry = gnttab_update_subpage_entry_v2,
- .update_trans_entry = gnttab_update_trans_entry_v2,
};
static void gnttab_request_version(void)
@@ -1313,15 +1172,6 @@ static void gnttab_request_version(void)
grefs_per_grant_frame = XEN_PAGE_SIZE /
sizeof(union grant_entry_v2);
gnttab_interface = &gnttab_v2_ops;
- } else if (grant_table_version == 2) {
- /*
- * If we've already used version 2 features,
- * but then suddenly discover that they're not
- * available (e.g. migrating to an older
- * version of Xen), almost unbounded badness
- * can happen.
- */
- panic("we need grant tables version 2, but only version 1 is available");
} else {
grant_table_version = 1;
grefs_per_grant_frame = XEN_PAGE_SIZE /