cregit-Linux how code gets into the kernel

Release 4.12 include/xen/grant_table.h

Directory: include/xen
/******************************************************************************
 * grant_table.h
 *
 * Two sets of functionality:
 * 1. 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 <asm/page.h>

#include <xen/interface/xen.h>
#include <xen/interface/grant_table.h>

#include <asm/xen/hypervisor.h>

#include <xen/features.h>
#include <xen/page.h>
#include <linux/mm_types.h>
#include <linux/page-flags.h>
#include <linux/kernel.h>


#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); }

Contributors

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Julien Grall35100.00%1100.00%
Total35100.00%1100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Ian Campbell78100.00%1100.00%
Total78100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Ian Campbell69100.00%1100.00%
Total69100.00%1100.00%

int arch_gnttab_init(unsigned long nr_shared); int arch_gnttab_map_shared(xen_pfn_t *frames, unsigned long nr_gframes, unsigned long max_nr_gframes, void **__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); 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 }

Contributors

PersonTokensPropCommitsCommitProp
Jennifer Herbert66100.00%1100.00%
Total66100.00%1100.00%

/* 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); }

Contributors

PersonTokensPropCommitsCommitProp
Julien Grall51100.00%1100.00%
Total51100.00%1100.00%

/* 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); }

Contributors

PersonTokensPropCommitsCommitProp
Julien Grall27100.00%1100.00%
Total27100.00%1100.00%

#endif /* __ASM_GNTTAB_H__ */

Overall Contributors

PersonTokensPropCommitsCommitProp
Jeremy Fitzhardinge25926.95%28.00%
Julien Grall19420.19%416.00%
Ian Campbell15616.23%28.00%
Jennifer Herbert15115.71%28.00%
Stefano Stabellini626.45%416.00%
David Vrabel353.64%312.00%
Konrad Rzeszutek Wilk323.33%14.00%
Isaku Yamahata262.71%28.00%
Andres Lagar-Cavilla252.60%14.00%
Bob Liu90.94%14.00%
Annie Li80.83%28.00%
Daniel De Graaf40.42%14.00%
Total961100.00%25100.00%
Directory: include/xen
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