238 lines
7.6 KiB
C
238 lines
7.6 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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#include <linux/spinlock.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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GUEST_HANDLE(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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DEFINE_GUEST_HANDLE_STRUCT(xen_memory_reservation);
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/*
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* An atomic exchange of memory pages. If return code is zero then
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* @out.extent_list provides GMFNs of the newly-allocated memory.
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* Returns zero on complete success, otherwise a negative error code.
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* On complete success then always @nr_exchanged == @in.nr_extents.
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* On partial success @nr_exchanged indicates how much work was done.
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*/
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#define XENMEM_exchange 11
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struct xen_memory_exchange {
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/*
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* [IN] Details of memory extents to be exchanged (GMFN bases).
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* Note that @in.address_bits is ignored and unused.
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*/
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struct xen_memory_reservation in;
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/*
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* [IN/OUT] Details of new memory extents.
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* We require that:
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* 1. @in.domid == @out.domid
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* 2. @in.nr_extents << @in.extent_order ==
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* @out.nr_extents << @out.extent_order
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* 3. @in.extent_start and @out.extent_start lists must not overlap
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* 4. @out.extent_start lists GPFN bases to be populated
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* 5. @out.extent_start is overwritten with allocated GMFN bases
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*/
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struct xen_memory_reservation out;
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/*
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* [OUT] Number of input extents that were successfully exchanged:
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* 1. The first @nr_exchanged input extents were successfully
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* deallocated.
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* 2. The corresponding first entries in the output extent list correctly
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* indicate the GMFNs that were successfully exchanged.
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* 3. All other input and output extents are untouched.
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* 4. If not all input exents are exchanged then the return code of this
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* command will be non-zero.
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* 5. THIS FIELD MUST BE INITIALISED TO ZERO BY THE CALLER!
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*/
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unsigned long nr_exchanged;
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};
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DEFINE_GUEST_HANDLE_STRUCT(xen_memory_exchange);
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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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GUEST_HANDLE(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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DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mfn_list);
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/*
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* Returns the location in virtual address space of the machine_to_phys
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* mapping table. Architectures which do not have a m2p table, or which do not
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* map it by default into guest address space, do not implement this command.
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* arg == addr of xen_machphys_mapping_t.
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*/
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#define XENMEM_machphys_mapping 12
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struct xen_machphys_mapping {
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unsigned long v_start, v_end; /* Start and end virtual addresses. */
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unsigned long max_mfn; /* Maximum MFN that can be looked up. */
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};
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DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mapping_t);
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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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DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap);
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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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GUEST_HANDLE(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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GUEST_HANDLE(ulong) mfn_list;
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};
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DEFINE_GUEST_HANDLE_STRUCT(xen_translate_gpfn_list);
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/*
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* Returns the pseudo-physical memory map as it was when the domain
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* was started (specified by XENMEM_set_memory_map).
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* arg == addr of struct xen_memory_map.
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*/
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#define XENMEM_memory_map 9
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struct xen_memory_map {
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/*
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* On call the number of entries which can be stored in buffer. On
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* return the number of entries which have been stored in
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* buffer.
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*/
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unsigned int nr_entries;
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/*
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* Entries in the buffer are in the same format as returned by the
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* BIOS INT 0x15 EAX=0xE820 call.
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*/
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GUEST_HANDLE(void) buffer;
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};
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DEFINE_GUEST_HANDLE_STRUCT(xen_memory_map);
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/*
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* Returns the real physical memory map. Passes the same structure as
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* XENMEM_memory_map.
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* arg == addr of struct xen_memory_map.
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*/
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#define XENMEM_machine_memory_map 10
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/*
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* Prevent the balloon driver from changing the memory reservation
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* during a driver critical region.
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*/
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extern spinlock_t xen_reservation_lock;
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#endif /* __XEN_PUBLIC_MEMORY_H__ */
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