linux/drivers/xen/mem-reservation.c

// SPDX-License-Identifier: GPL-2.0

/******************************************************************************
 * Xen memory reservation utilities.
 *
 * Copyright (c) 2003, B Dragovic
 * Copyright (c) 2003-2004, M Williamson, K Fraser
 * Copyright (c) 2005 Dan M. Smith, IBM Corporation
 * Copyright (c) 2010 Daniel Kiper
 * Copyright (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc.
 */

#include <asm/xen/hypercall.h>

#include <xen/interface/memory.h>
#include <xen/mem-reservation.h>
#include <linux/moduleparam.h>

bool __read_mostly xen_scrub_pages = … IS_ENABLED(…);
core_param(…);

/*
 * Use one extent per PAGE_SIZE to avoid to break down the page into
 * multiple frame.
 */
#define EXTENT_ORDER …

#ifdef CONFIG_XEN_HAVE_PVMMU
void __xenmem_reservation_va_mapping_update(unsigned long count,
					    struct page **pages,
					    xen_pfn_t *frames)
{ … }
EXPORT_SYMBOL_GPL(…);

void __xenmem_reservation_va_mapping_reset(unsigned long count,
					   struct page **pages)
{ … }
EXPORT_SYMBOL_GPL(…);
#endif /* CONFIG_XEN_HAVE_PVMMU */

/* @frames is an array of PFNs */
int xenmem_reservation_increase(int count, xen_pfn_t *frames)
{ … }
EXPORT_SYMBOL_GPL(…);

/* @frames is an array of GFNs */
int xenmem_reservation_decrease(int count, xen_pfn_t *frames)
{ … }
EXPORT_SYMBOL_GPL(…);