linux/arch/x86/xen/grant-table.c

// SPDX-License-Identifier: GPL-2.0 OR MIT
/******************************************************************************
 * 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.
 */

#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>


static struct gnttab_vm_area { … } 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)
{ … }

int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes,
			   unsigned long max_nr_gframes,
			   grant_status_t **__shared)
{ … }

void arch_gnttab_unmap(void *shared, unsigned long nr_gframes)
{ … }

static int gnttab_apply(pte_t *pte, unsigned long addr, void *data)
{ … }

static int arch_gnttab_valloc(struct gnttab_vm_area *area, unsigned nr_frames)
{ … }

static void arch_gnttab_vfree(struct gnttab_vm_area *area)
{ … }

int arch_gnttab_init(unsigned long nr_shared, unsigned long nr_status)
{ … }

#ifdef CONFIG_XEN_PVH
#include <xen/events.h>
#include <xen/xen-ops.h>
static int __init xen_pvh_gnttab_setup(void)
{ … }
/* Call it _before_ __gnttab_init as we need to initialize the
 * xen_auto_xlat_grant_frames first. */
core_initcall(xen_pvh_gnttab_setup);
#endif