mirror of
https://github.com/torvalds/linux.git
synced 2024-11-11 22:51:42 +00:00
cb85f123cd
* commit 'v3.2-rc3': (412 commits) Linux 3.2-rc3 virtio-pci: make reset operation safer virtio-mmio: Correct the name of the guest features selector virtio: add HAS_IOMEM dependency to MMIO platform bus driver eCryptfs: Extend array bounds for all filename chars eCryptfs: Flush file in vma close eCryptfs: Prevent file create race condition regulator: TPS65910: Fix VDD1/2 voltage selector count i2c: Make i2cdev_notifier_call static i2c: Delete ANY_I2C_BUS i2c: Fix device name for 10-bit slave address i2c-algo-bit: Generate correct i2c address sequence for 10-bit target drm: integer overflow in drm_mode_dirtyfb_ioctl() Revert "of/irq: of_irq_find_parent: check for parent equal to child" drivers/gpu/vga/vgaarb.c: add missing kfree drm/radeon/kms/atom: unify i2c gpio table handling drm/radeon/kms: fix up gpio i2c mask bits for r4xx for real ttm: Don't return the bo reserved on error path mount_subtree() pointless use-after-free iio: fix a leak due to improper use of anon_inode_getfd() ...
128 lines
3.9 KiB
C
128 lines
3.9 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;
|
|
}
|
|
|
|
/*
|
|
* This function is used to map shared frames to store grant status. It is
|
|
* different from map_pte_fn above, the frames type here is uint64_t.
|
|
*/
|
|
static int map_pte_fn_status(pte_t *pte, struct page *pmd_page,
|
|
unsigned long addr, void *data)
|
|
{
|
|
uint64_t **frames = (uint64_t **)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,
|
|
void **__shared)
|
|
{
|
|
int rc;
|
|
void *shared = *__shared;
|
|
|
|
if (shared == NULL) {
|
|
struct vm_struct *area =
|
|
alloc_vm_area(PAGE_SIZE * max_nr_gframes, NULL);
|
|
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;
|
|
}
|
|
|
|
int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes,
|
|
unsigned long max_nr_gframes,
|
|
grant_status_t **__shared)
|
|
{
|
|
int rc;
|
|
grant_status_t *shared = *__shared;
|
|
|
|
if (shared == NULL) {
|
|
/* No need to pass in PTE as we are going to do it
|
|
* in apply_to_page_range anyhow. */
|
|
struct vm_struct *area =
|
|
alloc_vm_area(PAGE_SIZE * max_nr_gframes, NULL);
|
|
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_status, &frames);
|
|
return rc;
|
|
}
|
|
|
|
void arch_gnttab_unmap(void *shared, unsigned long nr_gframes)
|
|
{
|
|
apply_to_page_range(&init_mm, (unsigned long)shared,
|
|
PAGE_SIZE * nr_gframes, unmap_pte_fn, NULL);
|
|
}
|