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/******************************************************************************
* memory.h
*
* Memory reservation and information.
*
* Copyright (c) 2005, Keir Fraser <keir@xensource.com>
*/
#ifndef __XEN_PUBLIC_MEMORY_H__
#define __XEN_PUBLIC_MEMORY_H__
/*
* Increase or decrease the specified domain's memory reservation. Returns a
* -ve errcode on failure, or the # extents successfully allocated or freed.
* arg == addr of struct xen_memory_reservation.
*/
#define XENMEM_increase_reservation 0
#define XENMEM_decrease_reservation 1
#define XENMEM_populate_physmap 6
struct xen_memory_reservation {
/*
* XENMEM_increase_reservation:
* OUT: MFN (*not* GMFN) bases of extents that were allocated
* XENMEM_decrease_reservation:
* IN: GMFN bases of extents to free
* XENMEM_populate_physmap:
* IN: GPFN bases of extents to populate with memory
* OUT: GMFN bases of extents that were allocated
* (NB. This command also updates the mach_to_phys translation table)
*/
GUEST_HANDLE(ulong) extent_start;
/* Number of extents, and size/alignment of each (2^extent_order pages). */
unsigned long nr_extents;
unsigned int extent_order;
/*
* Maximum # bits addressable by the user of the allocated region (e.g.,
* I/O devices often have a 32-bit limitation even in 64-bit systems). If
* zero then the user has no addressing restriction.
* This field is not used by XENMEM_decrease_reservation.
*/
unsigned int address_bits;
/*
* Domain whose reservation is being changed.
* Unprivileged domains can specify only DOMID_SELF.
*/
domid_t domid;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_memory_reservation);
/*
* Returns the maximum machine frame number of mapped RAM in this system.
* This command always succeeds (it never returns an error code).
* arg == NULL.
*/
#define XENMEM_maximum_ram_page 2
/*
* Returns the current or maximum memory reservation, in pages, of the
* specified domain (may be DOMID_SELF). Returns -ve errcode on failure.
* arg == addr of domid_t.
*/
#define XENMEM_current_reservation 3
#define XENMEM_maximum_reservation 4
/*
* Returns a list of MFN bases of 2MB extents comprising the machine_to_phys
* mapping table. Architectures which do not have a m2p table do not implement
* this command.
* arg == addr of xen_machphys_mfn_list_t.
*/
#define XENMEM_machphys_mfn_list 5
struct xen_machphys_mfn_list {
/*
* Size of the 'extent_start' array. Fewer entries will be filled if the
* machphys table is smaller than max_extents * 2MB.
*/
unsigned int max_extents;
/*
* Pointer to buffer to fill with list of extent starts. If there are
* any large discontiguities in the machine address space, 2MB gaps in
* the machphys table will be represented by an MFN base of zero.
*/
GUEST_HANDLE(ulong) extent_start;
/*
* Number of extents written to the above array. This will be smaller
* than 'max_extents' if the machphys table is smaller than max_e * 2MB.
*/
unsigned int nr_extents;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mfn_list);
/*
* Sets the GPFN at which a particular page appears in the specified guest's
* pseudophysical address space.
* arg == addr of xen_add_to_physmap_t.
*/
#define XENMEM_add_to_physmap 7
struct xen_add_to_physmap {
/* Which domain to change the mapping for. */
domid_t domid;
/* Source mapping space. */
#define XENMAPSPACE_shared_info 0 /* shared info page */
#define XENMAPSPACE_grant_table 1 /* grant table page */
unsigned int space;
/* Index into source mapping space. */
unsigned long idx;
/* GPFN where the source mapping page should appear. */
unsigned long gpfn;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap);
/*
* Translates a list of domain-specific GPFNs into MFNs. Returns a -ve error
* code on failure. This call only works for auto-translated guests.
*/
#define XENMEM_translate_gpfn_list 8
struct xen_translate_gpfn_list {
/* Which domain to translate for? */
domid_t domid;
/* Length of list. */
unsigned long nr_gpfns;
/* List of GPFNs to translate. */
GUEST_HANDLE(ulong) gpfn_list;
/*
* Output list to contain MFN translations. May be the same as the input
* list (in which case each input GPFN is overwritten with the output MFN).
*/
GUEST_HANDLE(ulong) mfn_list;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_translate_gpfn_list);
#endif /* __XEN_PUBLIC_MEMORY_H__ */