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xen/granttable: Support transitive grants

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These allow a domain A which has been granted access on a page of domain B's
memory to issue domain C with a copy-grant on the same page.  This is useful
e.g. for forwarding packets between domains.

Signed-off-by: Annie Li <annie.li@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Annie Li 2011-12-12 18:15:07 +08:00 • committed by Konrad Rzeszutek Wilk
parent 6666754b11
commit 9438ce9dbb
2 changed files with 82 additions and 0 deletions
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12
include/xen/grant_table.h
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@ -65,6 +65,9 @@ int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
int gnttab_grant_foreign_access_subpage(domid_t domid, unsigned long frame,
int flags, unsigned page_off,
unsigned length);
int gnttab_grant_foreign_access_trans(domid_t domid, int flags,
domid_t trans_domid,
grant_ref_t trans_gref);
/*
* Are sub-page grants available on this version of Xen? Returns true if they
@ -72,6 +75,12 @@ int gnttab_grant_foreign_access_subpage(domid_t domid, unsigned long frame,
*/
bool gnttab_subpage_grants_available(void);
/*
* Are transitive grants available on this version of Xen? Returns true if they
* are, and false if they're not.
*/
bool gnttab_trans_grants_available(void);
/*
* End access through the given grant reference, iff the grant entry is no
* longer in use. Return 1 if the grant entry was freed, 0 if it is still in
@ -121,6 +130,9 @@ int gnttab_grant_foreign_access_subpage_ref(grant_ref_t ref, domid_t domid,
unsigned long frame, int flags,
unsigned page_off,
unsigned length);
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);
void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
unsigned long pfn);