Messages in this thread Patch in this message | | | From | stefano.stabellini@eu ... | Subject | [PATCH 09/11] xen: introduce gnttab_map_refs and gnttab_unmap_refs | Date | Wed, 15 Dec 2010 13:40:44 +0000 |
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From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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> --- drivers/xen/grant-table.c | 36 ++++++++++++++++++++++++++++++++++++ include/xen/grant_table.h | 5 +++++ 2 files changed, 41 insertions(+), 0 deletions(-)
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c index 6c45318..a5cf820 100644 --- a/drivers/xen/grant-table.c +++ b/drivers/xen/grant-table.c @@ -447,6 +447,42 @@ unsigned int gnttab_max_grant_frames(void) } EXPORT_SYMBOL_GPL(gnttab_max_grant_frames); +int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops, + struct page **pages, unsigned int count) +{ + int i, ret; + pte_t val; + pte_t *pte; + unsigned long pfn, mfn; + + ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, map_ops, count); + + for (i = 0; i < count; i++) { + pfn = mfn_to_pfn(map_ops[i].host_addr >> PAGE_SHIFT); + pte = (pte_t *) __va((pfn << PAGE_SHIFT) + + (map_ops[i].host_addr & ~PAGE_MASK)); + val = *pte; + mfn = (native_pte_val(val) & PTE_PFN_MASK) >> PAGE_SHIFT; + m2p_add_override(mfn, pages[i]); + } + + return ret; +} +EXPORT_SYMBOL_GPL(gnttab_map_refs); + +int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops, + struct page **pages, unsigned int count) +{ + int i, ret; + + ret = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap_ops, count); + for (i = 0; i < count; i++) + m2p_remove_override(pages[i]); + + return ret; +} +EXPORT_SYMBOL_GPL(gnttab_unmap_refs); + static int gnttab_map(unsigned int start_idx, unsigned int end_idx) { struct gnttab_setup_table setup; diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h index 1821aa1..b1fab6b 100644 --- a/include/xen/grant_table.h +++ b/include/xen/grant_table.h @@ -155,4 +155,9 @@ unsigned int gnttab_max_grant_frames(void); #define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr)) +int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops, + struct page **pages, unsigned int count); +int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops, + struct page **pages, unsigned int count); + #endif /* __ASM_GNTTAB_H__ */ -- 1.5.6.5
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