/* SPDX-License-Identifier: MIT */
/******************************************************************************
* memory . h
*
* Memory reservation and information .
*
* Copyright ( c ) 2005 , Keir Fraser < keir @ xensource . com >
*/
#ifndef __XEN_PUBLIC_MEMORY_H__
#define __XEN_PUBLIC_MEMORY_H__
#include <linux/spinlock.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(xen_pfn_t) extent_start;
/* Number of extents, and size/alignment of each (2^extent_order pages). */
xen_ulong_t 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);
/*
* An atomic exchange of memory pages . If return code is zero then
* @ out . extent_list provides GMFNs of the newly - allocated memory .
* Returns zero on complete success , otherwise a negative error code .
* On complete success then always @ nr_exchanged = = @ in . nr_extents .
* On partial success @ nr_exchanged indicates how much work was done .
*/
#define XENMEM_exchange 11
struct xen_memory_exchange {
/*
* [ IN ] Details of memory extents to be exchanged ( GMFN bases ) .
* Note that @ in . address_bits is ignored and unused .
*/
struct xen_memory_reservation in;
/*
* [ IN / OUT ] Details of new memory extents .
* We require that :
* 1 . @ in . domid = = @ out . domid
* 2 . @ in . nr_extents < < @ in . extent_order = =
* @ out . nr_extents < < @ out . extent_order
* 3 . @ in . extent_start and @ out . extent_start lists must not overlap
* 4 . @ out . extent_start lists GPFN bases to be populated
* 5 . @ out . extent_start is overwritten with allocated GMFN bases
*/
struct xen_memory_reservation out;
/*
* [ OUT ] Number of input extents that were successfully exchanged :
* 1 . The first @ nr_exchanged input extents were successfully
* deallocated .
* 2 . The corresponding first entries in the output extent list correctly
* indicate the GMFNs that were successfully exchanged .
* 3 . All other input and output extents are untouched .
* 4 . If not all input exents are exchanged then the return code of this
* command will be non - zero .
* 5 . THIS FIELD MUST BE INITIALISED TO ZERO BY THE CALLER !
*/
xen_ulong_t nr_exchanged;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_memory_exchange);
/*
* 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 2 MB 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 * 2 MB .
*/
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 , 2 MB gaps in
* the machphys table will be represented by an MFN base of zero .
*/
GUEST_HANDLE(xen_pfn_t) 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 * 2 MB .
*/
unsigned int nr_extents;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mfn_list);
/*
* Returns the location in virtual address space of the machine_to_phys
* mapping table . Architectures which do not have a m2p table , or which do not
* map it by default into guest address space , do not implement this command .
* arg = = addr of xen_machphys_mapping_t .
*/
#define XENMEM_machphys_mapping 12
struct xen_machphys_mapping {
xen_ulong_t v_start, v_end; /* Start and end virtual addresses. */
xen_ulong_t max_mfn; /* Maximum MFN that can be looked up. */
};
DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mapping_t);
#define XENMAPSPACE_shared_info 0 /* shared info page */
#define XENMAPSPACE_grant_table 1 /* grant table page */
#define XENMAPSPACE_gmfn 2 /* GMFN */
#define XENMAPSPACE_gmfn_range 3 /* GMFN range, XENMEM_add_to_physmap only. */
#define XENMAPSPACE_gmfn_foreign 4 /* GMFN from another dom,
* XENMEM_add_to_physmap_range only .
*/
#define XENMAPSPACE_dev_mmio 5 /* device mmio region */
/*
* 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;
/* Number of pages to go through for gmfn_range */
uint16_t size;
/* Source mapping space. */
unsigned int space;
/* Index into source mapping space. */
xen_ulong_t idx;
/* GPFN where the source mapping page should appear. */
xen_pfn_t gpfn;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap);
/*** REMOVED ***/
/*#define XENMEM_translate_gpfn_list 8*/
#define XENMEM_add_to_physmap_range 23
struct xen_add_to_physmap_range {
/* IN */
/* Which domain to change the mapping for. */
domid_t domid;
uint16_t space; /* => enum phys_map_space */
/* Number of pages to go through */
uint16_t size;
domid_t foreign_domid; /* IFF gmfn_foreign */
/* Indexes into space being mapped. */
GUEST_HANDLE(xen_ulong_t) idxs;
/* GPFN in domid where the source mapping page should appear. */
GUEST_HANDLE(xen_pfn_t) gpfns;
/* OUT */
/* Per index error code. */
GUEST_HANDLE(int ) errs;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap_range);
/*
* Returns the pseudo - physical memory map as it was when the domain
* was started ( specified by XENMEM_set_memory_map ) .
* arg = = addr of struct xen_memory_map .
*/
#define XENMEM_memory_map 9
struct xen_memory_map {
/*
* On call the number of entries which can be stored in buffer . On
* return the number of entries which have been stored in
* buffer .
*/
unsigned int nr_entries;
/*
* Entries in the buffer are in the same format as returned by the
* BIOS INT 0 x15 EAX = 0 xE820 call .
*/
GUEST_HANDLE(void ) buffer;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_memory_map);
/*
* Returns the real physical memory map . Passes the same structure as
* XENMEM_memory_map .
* arg = = addr of struct xen_memory_map .
*/
#define XENMEM_machine_memory_map 10
/*
* Unmaps the page appearing at a particular GPFN from the specified guest ' s
* pseudophysical address space .
* arg = = addr of xen_remove_from_physmap_t .
*/
#define XENMEM_remove_from_physmap 15
struct xen_remove_from_physmap {
/* Which domain to change the mapping for. */
domid_t domid;
/* GPFN of the current mapping of the page. */
xen_pfn_t gpfn;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_remove_from_physmap);
/*
* Get the pages for a particular guest resource , so that they can be
* mapped directly by a tools domain .
*/
#define XENMEM_acquire_resource 28
struct xen_mem_acquire_resource {
/* IN - The domain whose resource is to be mapped */
domid_t domid;
/* IN - the type of resource */
uint16_t type;
#define XENMEM_resource_ioreq_server 0
#define XENMEM_resource_grant_table 1
/*
* IN - a type - specific resource identifier , which must be zero
* unless stated otherwise .
*
* type = = XENMEM_resource_ioreq_server - > id = = ioreq server id
* type = = XENMEM_resource_grant_table - > id defined below
*/
uint32_t id;
#define XENMEM_resource_grant_table_id_shared 0
#define XENMEM_resource_grant_table_id_status 1
/* IN/OUT - As an IN parameter number of frames of the resource
* to be mapped . However , if the specified value is 0 and
* frame_list is NULL then this field will be set to the
* maximum value supported by the implementation on return .
*/
uint32_t nr_frames;
/*
* OUT - Must be zero on entry . On return this may contain a bitwise
* OR of the following values .
*/
uint32_t flags;
/* The resource pages have been assigned to the calling domain */
#define _XENMEM_rsrc_acq_caller_owned 0
#define XENMEM_rsrc_acq_caller_owned (1 u << _XENMEM_rsrc_acq_caller_owned)
/*
* IN - the index of the initial frame to be mapped . This parameter
* is ignored if nr_frames is 0 .
*/
uint64_t frame;
#define XENMEM_resource_ioreq_server_frame_bufioreq 0
#define XENMEM_resource_ioreq_server_frame_ioreq(n) (1 + (n))
/*
* IN / OUT - If the tools domain is PV then , upon return , frame_list
* will be populated with the MFNs of the resource .
* If the tools domain is HVM then it is expected that , on
* entry , frame_list will be populated with a list of GFNs
* that will be mapped to the MFNs of the resource .
* If - EIO is returned then the frame_list has only been
* partially mapped and it is up to the caller to unmap all
* the GFNs .
* This parameter may be NULL if nr_frames is 0 .
*/
GUEST_HANDLE(xen_pfn_t) frame_list;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_mem_acquire_resource);
#endif /* __XEN_PUBLIC_MEMORY_H__ */
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