mirror of
https://github.com/torvalds/linux.git
synced 2024-12-15 23:51:46 +00:00
4dcaebbf65
Replace calls to the Xen-specific xen_alloc_vm_area() and xen_free_vm_area() functions with the generic equivalent (alloc_vm_area() and free_vm_area()). On x86, these were identical already. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
92 lines
3.0 KiB
C
92 lines
3.0 KiB
C
/******************************************************************************
|
|
* grant_table.c
|
|
* x86 specific part
|
|
*
|
|
* Granting foreign access to our memory reservation.
|
|
*
|
|
* Copyright (c) 2005-2006, Christopher Clark
|
|
* Copyright (c) 2004-2005, K A Fraser
|
|
* Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
|
|
* VA Linux Systems Japan. Split out x86 specific part.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/vmalloc.h>
|
|
|
|
#include <xen/interface/xen.h>
|
|
#include <xen/page.h>
|
|
#include <xen/grant_table.h>
|
|
|
|
#include <asm/pgtable.h>
|
|
|
|
static int map_pte_fn(pte_t *pte, struct page *pmd_page,
|
|
unsigned long addr, void *data)
|
|
{
|
|
unsigned long **frames = (unsigned long **)data;
|
|
|
|
set_pte_at(&init_mm, addr, pte, mfn_pte((*frames)[0], PAGE_KERNEL));
|
|
(*frames)++;
|
|
return 0;
|
|
}
|
|
|
|
static int unmap_pte_fn(pte_t *pte, struct page *pmd_page,
|
|
unsigned long addr, void *data)
|
|
{
|
|
|
|
set_pte_at(&init_mm, addr, pte, __pte(0));
|
|
return 0;
|
|
}
|
|
|
|
int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
|
|
unsigned long max_nr_gframes,
|
|
struct grant_entry **__shared)
|
|
{
|
|
int rc;
|
|
struct grant_entry *shared = *__shared;
|
|
|
|
if (shared == NULL) {
|
|
struct vm_struct *area =
|
|
alloc_vm_area(PAGE_SIZE * max_nr_gframes);
|
|
BUG_ON(area == NULL);
|
|
shared = area->addr;
|
|
*__shared = shared;
|
|
}
|
|
|
|
rc = apply_to_page_range(&init_mm, (unsigned long)shared,
|
|
PAGE_SIZE * nr_gframes,
|
|
map_pte_fn, &frames);
|
|
return rc;
|
|
}
|
|
|
|
void arch_gnttab_unmap_shared(struct grant_entry *shared,
|
|
unsigned long nr_gframes)
|
|
{
|
|
apply_to_page_range(&init_mm, (unsigned long)shared,
|
|
PAGE_SIZE * nr_gframes, unmap_pte_fn, NULL);
|
|
}
|