1775826cee
The balloon driver allows memory to be dynamically added or removed from the domain, in order to allow host memory to be balanced between multiple domains. This patch introduces the Xen balloon driver, though it currently only allows a domain to be shrunk from its initial size (and re-grown back to that size). A later patch will add the ability to grow a domain beyond its initial size. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
142 lines
4.2 KiB
C
142 lines
4.2 KiB
C
/******************************************************************************
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* memory.h
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*
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* Memory reservation and information.
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*
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* Copyright (c) 2005, Keir Fraser <keir@xensource.com>
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*/
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#ifndef __XEN_PUBLIC_MEMORY_H__
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#define __XEN_PUBLIC_MEMORY_H__
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/*
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* Increase or decrease the specified domain's memory reservation. Returns a
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* -ve errcode on failure, or the # extents successfully allocated or freed.
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* arg == addr of struct xen_memory_reservation.
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*/
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#define XENMEM_increase_reservation 0
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#define XENMEM_decrease_reservation 1
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#define XENMEM_populate_physmap 6
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struct xen_memory_reservation {
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/*
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* XENMEM_increase_reservation:
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* OUT: MFN (*not* GMFN) bases of extents that were allocated
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* XENMEM_decrease_reservation:
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* IN: GMFN bases of extents to free
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* XENMEM_populate_physmap:
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* IN: GPFN bases of extents to populate with memory
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* OUT: GMFN bases of extents that were allocated
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* (NB. This command also updates the mach_to_phys translation table)
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*/
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ulong extent_start;
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/* Number of extents, and size/alignment of each (2^extent_order pages). */
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unsigned long nr_extents;
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unsigned int extent_order;
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/*
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* Maximum # bits addressable by the user of the allocated region (e.g.,
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* I/O devices often have a 32-bit limitation even in 64-bit systems). If
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* zero then the user has no addressing restriction.
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* This field is not used by XENMEM_decrease_reservation.
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*/
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unsigned int address_bits;
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/*
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* Domain whose reservation is being changed.
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* Unprivileged domains can specify only DOMID_SELF.
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*/
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domid_t domid;
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};
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/*
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* Returns the maximum machine frame number of mapped RAM in this system.
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* This command always succeeds (it never returns an error code).
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* arg == NULL.
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*/
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#define XENMEM_maximum_ram_page 2
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/*
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* Returns the current or maximum memory reservation, in pages, of the
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* specified domain (may be DOMID_SELF). Returns -ve errcode on failure.
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* arg == addr of domid_t.
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*/
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#define XENMEM_current_reservation 3
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#define XENMEM_maximum_reservation 4
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/*
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* Returns a list of MFN bases of 2MB extents comprising the machine_to_phys
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* mapping table. Architectures which do not have a m2p table do not implement
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* this command.
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* arg == addr of xen_machphys_mfn_list_t.
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*/
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#define XENMEM_machphys_mfn_list 5
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struct xen_machphys_mfn_list {
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/*
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* Size of the 'extent_start' array. Fewer entries will be filled if the
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* machphys table is smaller than max_extents * 2MB.
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*/
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unsigned int max_extents;
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/*
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* Pointer to buffer to fill with list of extent starts. If there are
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* any large discontiguities in the machine address space, 2MB gaps in
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* the machphys table will be represented by an MFN base of zero.
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*/
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ulong extent_start;
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/*
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* Number of extents written to the above array. This will be smaller
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* than 'max_extents' if the machphys table is smaller than max_e * 2MB.
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*/
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unsigned int nr_extents;
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};
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/*
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* Sets the GPFN at which a particular page appears in the specified guest's
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* pseudophysical address space.
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* arg == addr of xen_add_to_physmap_t.
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*/
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#define XENMEM_add_to_physmap 7
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struct xen_add_to_physmap {
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/* Which domain to change the mapping for. */
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domid_t domid;
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/* Source mapping space. */
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#define XENMAPSPACE_shared_info 0 /* shared info page */
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#define XENMAPSPACE_grant_table 1 /* grant table page */
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unsigned int space;
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/* Index into source mapping space. */
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unsigned long idx;
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/* GPFN where the source mapping page should appear. */
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unsigned long gpfn;
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};
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/*
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* Translates a list of domain-specific GPFNs into MFNs. Returns a -ve error
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* code on failure. This call only works for auto-translated guests.
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*/
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#define XENMEM_translate_gpfn_list 8
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struct xen_translate_gpfn_list {
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/* Which domain to translate for? */
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domid_t domid;
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/* Length of list. */
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unsigned long nr_gpfns;
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/* List of GPFNs to translate. */
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ulong gpfn_list;
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/*
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* Output list to contain MFN translations. May be the same as the input
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* list (in which case each input GPFN is overwritten with the output MFN).
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*/
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ulong mfn_list;
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};
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#endif /* __XEN_PUBLIC_MEMORY_H__ */
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