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xen/balloon: Share common memory reservation routines

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Memory {increase|decrease}_reservation and VA mappings update/reset
code used in balloon driver can be made common, so other drivers can
also re-use the same functionality without open-coding.
Create a dedicated file for the shared code and export corresponding
symbols for other kernel modules.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Oleksandr Andrushchenko 2018-07-20 12:01:44 +03:00 • committed by Boris Ostrovsky
parent 8c3799ee25
commit ae4c51a50c
4 changed files with 184 additions and 69 deletions
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59
include/xen/mem-reservation.h Normal file
View file

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/* 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.
*/
#ifndef _XENMEM_RESERVATION_H
#define _XENMEM_RESERVATION_H
#include <linux/highmem.h>
#include <xen/page.h>
static inline void xenmem_reservation_scrub_page(struct page *page)
{
#ifdef CONFIG_XEN_SCRUB_PAGES
clear_highpage(page);
#endif
}
#ifdef CONFIG_XEN_HAVE_PVMMU
void __xenmem_reservation_va_mapping_update(unsigned long count,
struct page **pages,
xen_pfn_t *frames);
void __xenmem_reservation_va_mapping_reset(unsigned long count,
struct page **pages);
#endif
static inline void xenmem_reservation_va_mapping_update(unsigned long count,
struct page **pages,
xen_pfn_t *frames)
{
#ifdef CONFIG_XEN_HAVE_PVMMU
if (!xen_feature(XENFEAT_auto_translated_physmap))
__xenmem_reservation_va_mapping_update(count, pages, frames);
#endif
}
static inline void xenmem_reservation_va_mapping_reset(unsigned long count,
struct page **pages)
{
#ifdef CONFIG_XEN_HAVE_PVMMU
if (!xen_feature(XENFEAT_auto_translated_physmap))
__xenmem_reservation_va_mapping_reset(count, pages);
#endif
}
int xenmem_reservation_increase(int count, xen_pfn_t *frames);
int xenmem_reservation_decrease(int count, xen_pfn_t *frames);
#endif