Release 4.15 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, gnttab_status_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
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CommitProp
David Vrabel
69
62.73%
1
50.00%
Isaku Yamahata
41
37.27%
1
50.00%
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110
100.00%
2
100.00%



int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes,
			   unsigned long max_nr_gframes,
			   grant_status_t **__shared)
{
	grant_status_t *shared = *__shared;
	unsigned long addr;
	unsigned long i;

	if (shared == NULL)
		*__shared = shared = gnttab_status_vm_area.area->addr;

	addr = (unsigned long)shared;

	for (i = 0; i < nr_gframes; i++) {
		set_pte_at(&init_mm, addr, gnttab_status_vm_area.ptes[i],
			   mfn_pte(frames[i], PAGE_KERNEL));
		addr += PAGE_SIZE;
	}

	return 0;
}

Contributors
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Juergen Gross
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void arch_gnttab_unmap(void *shared, unsigned long nr_gframes)
{
	pte_t **ptes;
	unsigned long addr;
	unsigned long i;

	if (shared == gnttab_status_vm_area.area->addr)
		ptes = gnttab_status_vm_area.ptes;
	else
		ptes = gnttab_shared_vm_area.ptes;

	addr = (unsigned long)shared;

	for (i = 0; i < nr_gframes; i++) {
		set_pte_at(&init_mm, addr, ptes[i], __pte(0));
		addr += PAGE_SIZE;
	}
}

Contributors
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CommitProp
David Vrabel
44
46.81%
1
33.33%
Juergen Gross
28
29.79%
1
33.33%
Isaku Yamahata
22
23.40%
1
33.33%
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94
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
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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%



static void arch_gnttab_vfree(struct gnttab_vm_area *area)
{
	free_vm_area(area->area);
	kfree(area->ptes);
}

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Juergen Gross
25
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25
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100.00%



int arch_gnttab_init(unsigned long nr_shared, unsigned long nr_status)
{
	int ret;

	if (!xen_pv_domain())
		return 0;

	ret = arch_gnttab_valloc(&gnttab_shared_vm_area, nr_shared);
	if (ret < 0)
		return ret;

	/*
         * Always allocate the space for the status frames in case
         * we're migrated to a host with V2 support.
         */
	ret = arch_gnttab_valloc(&gnttab_status_vm_area, nr_status);
	if (ret < 0)
		goto err;

	return 0;
err:
	arch_gnttab_vfree(&gnttab_shared_vm_area);
	return -ENOMEM;
}

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CommitProp
Juergen Gross
53
67.09%
1
25.00%
David Vrabel
13
16.46%
1
25.00%
Annie Li
12
15.19%
1
25.00%
Isaku Yamahata
1
1.27%
1
25.00%
Total
79
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
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Konrad Rzeszutek Wilk
24
54.55%
1
25.00%
Shannon Zhao
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25.00%
David Vrabel
2
4.55%
1
25.00%
Dave Jones
1
2.27%
1
25.00%
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44
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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
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Tokens
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Commits
CommitProp
Juergen Gross
217
35.63%
1
8.33%
David Vrabel
205
33.66%
4
33.33%
Isaku Yamahata
110
18.06%
1
8.33%
Konrad Rzeszutek Wilk
40
6.57%
2
16.67%
Shannon Zhao
18
2.96%
1
8.33%
Annie Li
12
1.97%
1
8.33%
SF Markus Elfring
6
0.99%
1
8.33%
Dave Jones
1
0.16%
1
8.33%
Total
609
100.00%
12
100.00%
Directory: arch/x86/xen

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