Release 4.14 arch/x86/xen/grant-table.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/slab.h>
#include <linux/vmalloc.h>
#include <xen/interface/xen.h>
#include <xen/page.h>
#include <xen/grant_table.h>
#include <xen/xen.h>
#include <asm/pgtable.h>
static struct gnttab_vm_area {
struct vm_struct *area;
pte_t **ptes;
} gnttab_shared_vm_area;
int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
unsigned long max_nr_gframes,
void **__shared)
{
void *shared = *__shared;
unsigned long addr;
unsigned long i;
if (shared == NULL)
*__shared = shared = gnttab_shared_vm_area.area->addr;
addr = (unsigned long)shared;
for (i = 0; i < nr_gframes; i++) {
set_pte_at(&init_mm, addr, gnttab_shared_vm_area.ptes[i],
mfn_pte(frames[i], PAGE_KERNEL));
addr += PAGE_SIZE;
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Vrabel | 69 | 62.73% | 1 | 50.00% |
| Isaku Yamahata | 41 | 37.27% | 1 | 50.00% |
| Total | 110 | 100.00% | 2 | 100.00% |
void arch_gnttab_unmap(void *shared, unsigned long nr_gframes)
{
unsigned long addr;
unsigned long i;
addr = (unsigned long)shared;
for (i = 0; i < nr_gframes; i++) {
set_pte_at(&init_mm, addr, gnttab_shared_vm_area.ptes[i],
__pte(0));
addr += PAGE_SIZE;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Vrabel | 46 | 67.65% | 2 | 66.67% |
| Isaku Yamahata | 22 | 32.35% | 1 | 33.33% |
| Total | 68 | 100.00% | 3 | 100.00% |
static int arch_gnttab_valloc(struct gnttab_vm_area *area, unsigned nr_frames)
{
area->ptes = kmalloc_array(nr_frames, sizeof(*area->ptes), GFP_KERNEL);
if (area->ptes == NULL)
return -ENOMEM;
area->area = alloc_vm_area(PAGE_SIZE * nr_frames, area->ptes);
if (area->area == NULL) {
kfree(area->ptes);
return -ENOMEM;
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Vrabel | 55 | 65.48% | 3 | 60.00% |
| Isaku Yamahata | 23 | 27.38% | 1 | 20.00% |
| SF Markus Elfring | 6 | 7.14% | 1 | 20.00% |
| Total | 84 | 100.00% | 5 | 100.00% |
int arch_gnttab_init(unsigned long nr_shared)
{
if (!xen_pv_domain())
return 0;
return arch_gnttab_valloc(&gnttab_shared_vm_area, nr_shared);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Vrabel | 14 | 51.85% | 2 | 50.00% |
| Annie Li | 12 | 44.44% | 1 | 25.00% |
| Isaku Yamahata | 1 | 3.70% | 1 | 25.00% |
| Total | 27 | 100.00% | 4 | 100.00% |
#ifdef CONFIG_XEN_PVH
#include <xen/events.h>
#include <xen/xen-ops.h>
static int __init xen_pvh_gnttab_setup(void)
{
if (!xen_pvh_domain())
return -ENODEV;
xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
return xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
&xen_auto_xlat_grant_frames.vaddr,
xen_auto_xlat_grant_frames.count);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Konrad Rzeszutek Wilk | 24 | 54.55% | 1 | 25.00% |
| Shannon Zhao | 17 | 38.64% | 1 | 25.00% |
| David Vrabel | 2 | 4.55% | 1 | 25.00% |
| Dave Jones | 1 | 2.27% | 1 | 25.00% |
| Total | 44 | 100.00% | 4 | 100.00% |
/* Call it _before_ __gnttab_init as we need to initialize the
* xen_auto_xlat_grant_frames first. */
core_initcall(xen_pvh_gnttab_setup);
#endif
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Vrabel | 208 | 52.66% | 5 | 41.67% |
| Isaku Yamahata | 110 | 27.85% | 1 | 8.33% |
| Konrad Rzeszutek Wilk | 40 | 10.13% | 2 | 16.67% |
| Shannon Zhao | 18 | 4.56% | 1 | 8.33% |
| Annie Li | 12 | 3.04% | 1 | 8.33% |
| SF Markus Elfring | 6 | 1.52% | 1 | 8.33% |
| Dave Jones | 1 | 0.25% | 1 | 8.33% |
| Total | 395 | 100.00% | 12 | 100.00% |
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