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authorStefano Stabellini <stefano.stabellini@eu.citrix.com>2010-12-10 09:54:44 -0500
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-01-11 14:32:00 -0500
commit289b777eac19c811b474593b4d2fd14e46340c23 (patch)
tree5474d85065eb539d51df994fbdfab5cd2cc0e400 /drivers/xen/grant-table.c
parent9b705f0e98c489b18ba22a6eab9d694b546c8552 (diff)
xen: introduce gnttab_map_refs and gnttab_unmap_refs
gnttab_map_refs maps some grant refs and uses the new m2p override to set a proper m2p mapping for the granted pages. gnttab_unmap_refs unmaps the granted refs and removes th mappings from the m2p override. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen/grant-table.c')
-rw-r--r--drivers/xen/grant-table.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 6c4531816496..1afd5690858c 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -447,6 +447,42 @@ unsigned int gnttab_max_grant_frames(void)
447} 447}
448EXPORT_SYMBOL_GPL(gnttab_max_grant_frames); 448EXPORT_SYMBOL_GPL(gnttab_max_grant_frames);
449 449
450int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
451 struct page **pages, unsigned int count)
452{
453 int i, ret;
454 pte_t *pte;
455 unsigned long mfn;
456
457 ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, map_ops, count);
458
459 for (i = 0; i < count; i++) {
460 /* m2p override only supported for GNTMAP_contains_pte mappings */
461 if (!(map_ops[i].flags & GNTMAP_contains_pte))
462 continue;
463 pte = (pte_t *) (mfn_to_virt(PFN_DOWN(map_ops[i].host_addr)) +
464 (map_ops[i].host_addr & ~PAGE_MASK));
465 mfn = pte_mfn(*pte);
466 m2p_add_override(mfn, pages[i]);
467 }
468
469 return ret;
470}
471EXPORT_SYMBOL_GPL(gnttab_map_refs);
472
473int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
474 struct page **pages, unsigned int count)
475{
476 int i, ret;
477
478 ret = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap_ops, count);
479 for (i = 0; i < count; i++)
480 m2p_remove_override(pages[i]);
481
482 return ret;
483}
484EXPORT_SYMBOL_GPL(gnttab_unmap_refs);
485
450static int gnttab_map(unsigned int start_idx, unsigned int end_idx) 486static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
451{ 487{
452 struct gnttab_setup_table setup; 488 struct gnttab_setup_table setup;