/* SPDX-License-Identifier: GPL-2.0 *//****************************************************************************** * 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     6struct 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             11struct 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 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    5struct 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(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 * 2MB.     */    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     12struct 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      7struct 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 23struct 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           9struct 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 0x15 EAX=0xE820 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  /* * Prevent the balloon driver from changing the memory reservation * during a driver critical region. */extern spinlock_t xen_reservation_lock; /* * 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      15struct 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); #endif /* __XEN_PUBLIC_MEMORY_H__ */