mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Julien Grall](/assets/img/avatar_default.png)
With the 64KB page granularity support on ARM64, a Linux page may be split accross multiple grant. Currently we have the helper gnttab_foreach_grant_in_grant to break a Linux page based on an offset and a len, but it doesn't fit when we only have a number of grants in hand. Introduce a new helper which take an array of Linux page and a number of grant and will figure out the address of each grant. Signed-off-by: Julien Grall <julien.grall@citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
284 lines
8.9 KiB
C
284 lines
8.9 KiB
C
/******************************************************************************
|
|
* 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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
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
|
|
}
|
|
|
|
/* 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__ */
|