balloon_impl.h revision 843e19887f64dde75055cf8842fc4db2171eff45
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_BALLOON_IMPL_H
#define _SYS_BALLOON_IMPL_H
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/balloon.h>
#include <sys/types.h>
#include <vm/page.h>
#include <sys/xen_mmu.h> /* to get typedef of mfn_t */
#ifdef __cplusplus
extern "C" {
#endif
/*
* This file contains interfaces for both the balloon kernel thread
* and the balloon driver. The balloon device is installed under /dev/xen,
* and can be used with the ioctl values in balloon.h to get the balloon
* memory status.
*/
/* balloon thread declarations */
void balloon_init(pgcnt_t);
size_t balloon_values(int);
void balloon_drv_added(int64_t);
void balloon_drv_subtracted(int64_t);
long balloon_alloc_pages(uint_t, mfn_t *);
long balloon_free_pages(uint_t, mfn_t *, caddr_t, pfn_t *);
long balloon_replace_pages(uint_t, page_t **, uint_t, uint_t, mfn_t *);
/* balloon driver information */
#define BALLOON_MINOR 0
/*
* Critical stats for the balloon thread. All values are in pages.
*/
typedef struct {
pgcnt_t bln_current_pages; /* current reservation */
pgcnt_t bln_new_target; /* target value for reservation */
pgcnt_t bln_max_pages; /* first pfn for which we don't have a page_t */
pgcnt_t bln_low; /* lowest value of reservation since boot */
pgcnt_t bln_high; /* highest value of reservation since boot */
spgcnt_t bln_hv_pages; /* number of total pages given to hypervisor */
spgcnt_t bln_hard_limit; /* domain's max-mem limit */
} bln_stats_t;
#ifdef __cplusplus
}
#endif
#endif /* _SYS_BALLOON_IMPL_H */