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Granting foreign access to our memory reservation. * 2. Accessing others' memory reservations via grant references. * (i.e., mechanisms for both sender and recipient of grant references) * * Copyright (c) 2004-2005, K A Fraser * Copyright (c) 2005, Christopher Clark * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation; or, when distributed * separately from the Linux kernel or incorporated into other * software packages, subject to the following license: * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this source file (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, copy, modify, * merge, publish, distribute, sublicense, and/or sell copies of the Software, * and to permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ #ifndef __ASM_GNTTAB_H__ #define __ASM_GNTTAB_H__ #include #include #include #include #include #include #include #include #include #define GNTTAB_RESERVED_XENSTORE 1 /* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */ #define NR_GRANT_FRAMES 4 struct gnttab_free_callback { struct gnttab_free_callback *next; void (*fn)(void *); void *arg; u16 count; }; struct gntab_unmap_queue_data; typedef void (*gnttab_unmap_refs_done)(int result, struct gntab_unmap_queue_data *data); struct gntab_unmap_queue_data { struct delayed_work gnttab_work; void *data; gnttab_unmap_refs_done done; struct gnttab_unmap_grant_ref *unmap_ops; struct gnttab_unmap_grant_ref *kunmap_ops; struct page **pages; unsigned int count; unsigned int age; }; int gnttab_init(void); int gnttab_suspend(void); int gnttab_resume(void); int gnttab_grant_foreign_access(domid_t domid, unsigned long frame, int readonly); /* * 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 * use. */ int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly); /* * Eventually end access through the given grant reference, and once that * access has been ended, free the given page too. Access will be ended * immediately iff the grant entry is not in use, otherwise it will happen * some time later. page may be 0, in which case no freeing will occur. */ void gnttab_end_foreign_access(grant_ref_t ref, int readonly, unsigned long page); int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn); unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref); unsigned long gnttab_end_foreign_transfer(grant_ref_t ref); int gnttab_query_foreign_access(grant_ref_t ref); /* * operations on reserved batches of grant references */ int gnttab_alloc_grant_references(u16 count, grant_ref_t *pprivate_head); void gnttab_free_grant_reference(grant_ref_t ref); void gnttab_free_grant_references(grant_ref_t head); int gnttab_empty_grant_references(const grant_ref_t *pprivate_head); int gnttab_claim_grant_reference(grant_ref_t *pprivate_head); void gnttab_release_grant_reference(grant_ref_t *private_head, grant_ref_t release); void gnttab_request_free_callback(struct gnttab_free_callback *callback, void (*fn)(void *), void *arg, u16 count); 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); /* Give access to the first 4K of the page */ static inline void gnttab_page_grant_foreign_access_ref_one( grant_ref_t ref, domid_t domid, struct page *page, int readonly) { gnttab_grant_foreign_access_ref(ref, domid, xen_page_to_gfn(page), readonly); } void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid, unsigned long pfn); static inline void gnttab_set_map_op(struct gnttab_map_grant_ref *map, phys_addr_t addr, uint32_t flags, grant_ref_t ref, domid_t domid) { if (flags & GNTMAP_contains_pte) map->host_addr = addr; else if (xen_feature(XENFEAT_auto_translated_physmap)) map->host_addr = __pa(addr); else map->host_addr = addr; map->flags = flags; map->ref = ref; map->dom = domid; map->status = 1; /* arbitrary positive value */ } static inline void gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, phys_addr_t addr, uint32_t flags, grant_handle_t handle) { if (flags & GNTMAP_contains_pte) unmap->host_addr = addr; else if (xen_feature(XENFEAT_auto_translated_physmap)) unmap->host_addr = __pa(addr); else unmap->host_addr = addr; unmap->handle = handle; unmap->dev_bus_addr = 0; } int arch_gnttab_init(unsigned long nr_shared, unsigned long nr_status); int arch_gnttab_map_shared(xen_pfn_t *frames, unsigned long nr_gframes, unsigned long max_nr_gframes, void **__shared); int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes, unsigned long max_nr_gframes, grant_status_t **__shared); void arch_gnttab_unmap(void *shared, unsigned long nr_gframes); struct grant_frames { xen_pfn_t *pfn; unsigned int count; void *vaddr; }; extern struct grant_frames xen_auto_xlat_grant_frames; unsigned int gnttab_max_grant_frames(void); int gnttab_setup_auto_xlat_frames(phys_addr_t addr); void gnttab_free_auto_xlat_frames(void); #define gnttab_map_vaddr(map) ((void *)(map.host_virt_addr)) int gnttab_alloc_pages(int nr_pages, struct page **pages); void gnttab_free_pages(int nr_pages, struct page **pages); #ifdef CONFIG_XEN_GRANT_DMA_ALLOC struct gnttab_dma_alloc_args { /* Device for which DMA memory will be/was allocated. */ struct device *dev; /* If set then DMA buffer is coherent and write-combine otherwise. */ bool coherent; int nr_pages; struct page **pages; xen_pfn_t *frames; void *vaddr; dma_addr_t dev_bus_addr; }; int gnttab_dma_alloc_pages(struct gnttab_dma_alloc_args *args); int gnttab_dma_free_pages(struct gnttab_dma_alloc_args *args); #endif int gnttab_pages_set_private(int nr_pages, struct page **pages); void gnttab_pages_clear_private(int nr_pages, struct page **pages); int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops, struct gnttab_map_grant_ref *kmap_ops, struct page **pages, unsigned int count); int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops, struct gnttab_unmap_grant_ref *kunmap_ops, struct page **pages, unsigned int count); void gnttab_unmap_refs_async(struct gntab_unmap_queue_data* item); int gnttab_unmap_refs_sync(struct gntab_unmap_queue_data *item); /* Perform a batch of grant map/copy operations. Retry every batch slot * for which the hypervisor returns GNTST_eagain. This is typically due * to paged out target frames. * * Will retry for 1, 2, ... 255 ms, i.e. 256 times during 32 seconds. * * Return value in each iand every status field of the batch guaranteed * to not be GNTST_eagain. */ void gnttab_batch_map(struct gnttab_map_grant_ref *batch, unsigned count); void gnttab_batch_copy(struct gnttab_copy *batch, unsigned count); struct xen_page_foreign { domid_t domid; grant_ref_t gref; }; static inline struct xen_page_foreign *xen_page_foreign(struct page *page) { if (!PageForeign(page)) return NULL; #if BITS_PER_LONG < 64 return (struct xen_page_foreign *)page->private; #else BUILD_BUG_ON(sizeof(struct xen_page_foreign) > BITS_PER_LONG); return (struct xen_page_foreign *)&page->private; #endif } /* Split Linux page in chunk of the size of the grant and call fn * * Parameters of fn: * gfn: guest frame number * offset: offset in the grant * len: length of the data in the grant. * data: internal information */ typedef void (*xen_grant_fn_t)(unsigned long gfn, unsigned int offset, unsigned int len, void *data); void gnttab_foreach_grant_in_range(struct page *page, unsigned int offset, unsigned int len, xen_grant_fn_t fn, void *data); /* Helper to get to call fn only on the first "grant chunk" */ static inline void gnttab_for_one_grant(struct page *page, unsigned int offset, unsigned len, xen_grant_fn_t fn, void *data) { /* The first request is limited to the size of one grant */ len = min_t(unsigned int, XEN_PAGE_SIZE - (offset & ~XEN_PAGE_MASK), len); gnttab_foreach_grant_in_range(page, offset, len, fn, data); } /* Get @nr_grefs grants from an array of page and call fn for each grant */ void gnttab_foreach_grant(struct page **pages, unsigned int nr_grefs, xen_grant_fn_t fn, void *data); /* Get the number of grant in a specified region * * start: Offset from the beginning of the first page * len: total length of data (can cross multiple page) */ static inline unsigned int gnttab_count_grant(unsigned int start, unsigned int len) { return XEN_PFN_UP(xen_offset_in_page(start) + len); } #endif /* __ASM_GNTTAB_H__ */