165 lines
5.2 KiB
C
165 lines
5.2 KiB
C
/******************************************************************************
|
|
* gnttab.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__
|
|
|
|
#include <xen/interface/grant_table.h>
|
|
|
|
#include <xen/hypervisor.h>
|
|
#include <xen/interface/grant_table.h>
|
|
#include <machine/xen/xen-os.h>
|
|
#include <xen/features.h>
|
|
|
|
struct gnttab_free_callback {
|
|
struct gnttab_free_callback *next;
|
|
void (*fn)(void *);
|
|
void *arg;
|
|
uint16_t count;
|
|
};
|
|
|
|
int gnttab_init(void);
|
|
|
|
/*
|
|
* Allocate a grant table reference and return it in *result. Returns
|
|
* zero on success or errno on error.
|
|
*/
|
|
int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
|
|
int flags, grant_ref_t *result);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* 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, void *page);
|
|
|
|
int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn, grant_ref_t *result);
|
|
|
|
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(uint16_t 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, uint16_t 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 flags);
|
|
|
|
void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
|
|
unsigned long pfn);
|
|
|
|
int gnttab_suspend(void);
|
|
int gnttab_resume(void);
|
|
|
|
#if 0
|
|
|
|
#include <xen/features.h>
|
|
|
|
static inline void
|
|
gnttab_set_map_op(struct gnttab_map_grant_ref *map, vm_paddr_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 = vtophys(addr);
|
|
else
|
|
map->host_addr = addr;
|
|
|
|
map->flags = flags;
|
|
map->ref = ref;
|
|
map->dom = domid;
|
|
}
|
|
|
|
static inline void
|
|
gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, vm_paddr_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 = vtophys(addr);
|
|
else
|
|
unmap->host_addr = addr;
|
|
|
|
unmap->handle = handle;
|
|
unmap->dev_bus_addr = 0;
|
|
}
|
|
|
|
static inline void
|
|
gnttab_set_replace_op(struct gnttab_unmap_and_replace *unmap, vm_paddr_t addr,
|
|
vm_paddr_t new_addr, grant_handle_t handle)
|
|
{
|
|
if (xen_feature(XENFEAT_auto_translated_physmap)) {
|
|
unmap->host_addr = vtophys(addr);
|
|
unmap->new_addr = vtophys(new_addr);
|
|
} else {
|
|
unmap->host_addr = addr;
|
|
unmap->new_addr = new_addr;
|
|
}
|
|
|
|
unmap->handle = handle;
|
|
}
|
|
#endif
|
|
|
|
#endif /* __ASM_GNTTAB_H__ */
|