FreeBSD/Linux Kernel Cross Reference
sys/contrib/xen/memory.h

     /******************************************************************************
      * memory.h
      *
      * Memory reservation and information.
      *
      * Permission is hereby granted, free of charge, to any person obtaining a copy
      * of this software and associated documentation files (the "Software"), to
      * deal in the Software without restriction, including without limitation the
      * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
     * sell copies of the Software, and to permit persons to whom the Software is
     * furnished to do so, subject to the following conditions:
     *
     * The above copyright notice and this permission notice shall be included in
     * all copies or substantial portions of the Software.
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     * DEALINGS IN THE SOFTWARE.
     *
     * Copyright (c) 2005, Keir Fraser <keir@xensource.com>
     */
    
    #ifndef __XEN_PUBLIC_MEMORY_H__
    #define __XEN_PUBLIC_MEMORY_H__
    
    #include "xen.h"
    #include "physdev.h"
    
    /*
     * Increase or decrease the specified domain's memory reservation. Returns the
     * number of 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
    
    #if __XEN_INTERFACE_VERSION__ >= 0x00030209
    /*
     * 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.
     */
    #define XENMEMF_address_bits(x)     (x)
    #define XENMEMF_get_address_bits(x) ((x) & 0xffu)
    /* NUMA node to allocate from. */
    #define XENMEMF_node(x)     (((x) + 1) << 8)
    #define XENMEMF_get_node(x) ((((x) >> 8) - 1) & 0xffu)
    /* Flag to populate physmap with populate-on-demand entries */
    #define XENMEMF_populate_on_demand (1<<16)
    /* Flag to request allocation only from the node specified */
    #define XENMEMF_exact_node_request  (1<<17)
    #define XENMEMF_exact_node(n) (XENMEMF_node(n) | XENMEMF_exact_node_request)
    /* Flag to indicate the node specified is virtual node */
    #define XENMEMF_vnode  (1<<18)
    #endif
    
    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)
         * XENMEM_claim_pages:
         *   IN: must be zero
         */
        XEN_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;
    
    #if __XEN_INTERFACE_VERSION__ >= 0x00030209
        /* XENMEMF flags. */
        unsigned int   mem_flags;
    #else
        unsigned int   address_bits;
    #endif
    
        /*
         * Domain whose reservation is being changed.
         * Unprivileged domains can specify only DOMID_SELF.
         */
        domid_t        domid;
    };
    typedef struct xen_memory_reservation xen_memory_reservation_t;
    DEFINE_XEN_GUEST_HANDLE(xen_memory_reservation_t);
    
    /*
    * 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.
    *
    * Note that only PV guests can use this operation.
    */
   #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;
   };
   typedef struct xen_memory_exchange xen_memory_exchange_t;
   DEFINE_XEN_GUEST_HANDLE(xen_memory_exchange_t);
   
   /*
    * 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
   
   struct xen_memory_domain {
       /* [IN] Domain information is being queried for. */
       domid_t domid;
   };
   
   /*
    * 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 struct xen_memory_domain.
    */
   #define XENMEM_current_reservation  3
   #define XENMEM_maximum_reservation  4
   
   /*
    * Returns the maximum GFN in use by the specified domain (may be DOMID_SELF).
    * Returns -ve errcode on failure.
    * arg == addr of struct xen_memory_domain.
    */
   #define XENMEM_maximum_gpfn         14
   
   /*
    * 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.
        */
       XEN_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;
   };
   typedef struct xen_machphys_mfn_list xen_machphys_mfn_list_t;
   DEFINE_XEN_GUEST_HANDLE(xen_machphys_mfn_list_t);
   
   /*
    * For a compat caller, this is identical to XENMEM_machphys_mfn_list.
    *
    * For a non compat caller, this functions similarly to
    * XENMEM_machphys_mfn_list, but returns the mfns making up the compatibility
    * m2p table.
    */
   #define XENMEM_machphys_compat_mfn_list     25
   
   /*
    * 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. */
   };
   typedef struct xen_machphys_mapping xen_machphys_mapping_t;
   DEFINE_XEN_GUEST_HANDLE(xen_machphys_mapping_t);
   
   /* Source mapping space. */
   /* ` enum phys_map_space { */
   #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_batch only. */
   #define XENMAPSPACE_dev_mmio     5 /* device mmio region
                                         ARM only; the region is mapped in
                                         Stage-2 using the Normal Memory
                                         Inner/Outer Write-Back Cacheable
                                         memory attribute. */
   /* ` } */
   
   /*
    * Sets the GPFN at which a particular page appears in the specified guest's
    * physical address space (translated guests only).
    * 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;
   
       unsigned int space; /* => enum phys_map_space */
   
   #define XENMAPIDX_grant_table_status 0x80000000
   
       /* Index into space being mapped. */
       xen_ulong_t idx;
   
       /* GPFN in domid where the source mapping page should appear. */
       xen_pfn_t     gpfn;
   };
   typedef struct xen_add_to_physmap xen_add_to_physmap_t;
   DEFINE_XEN_GUEST_HANDLE(xen_add_to_physmap_t);
   
   /* A batched version of add_to_physmap. */
   #define XENMEM_add_to_physmap_batch 23
   struct xen_add_to_physmap_batch {
       /* 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;
   
   #if __XEN_INTERFACE_VERSION__ < 0x00040700
       domid_t foreign_domid; /* IFF gmfn_foreign. Should be 0 for other spaces. */
   #else
       union xen_add_to_physmap_batch_extra {
           domid_t foreign_domid; /* gmfn_foreign */
           uint16_t res0;  /* All the other spaces. Should be 0 */
       } u;
   #endif
   
       /* Indexes into space being mapped. */
       XEN_GUEST_HANDLE(xen_ulong_t) idxs;
   
       /* GPFN in domid where the source mapping page should appear. */
       XEN_GUEST_HANDLE(xen_pfn_t) gpfns;
   
       /* OUT */
   
       /* Per index error code. */
       XEN_GUEST_HANDLE(int) errs;
   };
   typedef struct xen_add_to_physmap_batch xen_add_to_physmap_batch_t;
   DEFINE_XEN_GUEST_HANDLE(xen_add_to_physmap_batch_t);
   
   #if __XEN_INTERFACE_VERSION__ < 0x00040400
   #define XENMEM_add_to_physmap_range XENMEM_add_to_physmap_batch
   #define xen_add_to_physmap_range xen_add_to_physmap_batch
   typedef struct xen_add_to_physmap_batch xen_add_to_physmap_range_t;
   DEFINE_XEN_GUEST_HANDLE(xen_add_to_physmap_range_t);
   #endif
   
   /*
    * Unmaps the page appearing at a particular GPFN from the specified guest's
    * physical address space (translated guests only).
    * 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;
   };
   typedef struct xen_remove_from_physmap xen_remove_from_physmap_t;
   DEFINE_XEN_GUEST_HANDLE(xen_remove_from_physmap_t);
   
   /*** REMOVED ***/
   /*#define XENMEM_translate_gpfn_list  8*/
   
   /*
    * Returns the pseudo-physical memory map as it was when the domain
    * was started (specified by XENMEM_set_memory_map).
    * arg == addr of xen_memory_map_t.
    */
   #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 0x15 EAX=0xE820 call.
        */
       XEN_GUEST_HANDLE(void) buffer;
   };
   typedef struct xen_memory_map xen_memory_map_t;
   DEFINE_XEN_GUEST_HANDLE(xen_memory_map_t);
   
   /*
    * Returns the real physical memory map. Passes the same structure as
    * XENMEM_memory_map.
    * Specifying buffer as NULL will return the number of entries required
    * to store the complete memory map.
    * arg == addr of xen_memory_map_t.
    */
   #define XENMEM_machine_memory_map   10
   
   /*
    * Set the pseudo-physical memory map of a domain, as returned by
    * XENMEM_memory_map.
    * arg == addr of xen_foreign_memory_map_t.
    */
   #define XENMEM_set_memory_map       13
   struct xen_foreign_memory_map {
       domid_t domid;
       struct xen_memory_map map;
   };
   typedef struct xen_foreign_memory_map xen_foreign_memory_map_t;
   DEFINE_XEN_GUEST_HANDLE(xen_foreign_memory_map_t);
   
   #define XENMEM_set_pod_target       16
   #define XENMEM_get_pod_target       17
   struct xen_pod_target {
       /* IN */
       uint64_t target_pages;
       /* OUT */
       uint64_t tot_pages;
       uint64_t pod_cache_pages;
       uint64_t pod_entries;
       /* IN */
       domid_t domid;
   };
   typedef struct xen_pod_target xen_pod_target_t;
   
   #if defined(__XEN__) || defined(__XEN_TOOLS__)
   
   #ifndef uint64_aligned_t
   #define uint64_aligned_t uint64_t
   #endif
   
   /*
    * Get the number of MFNs saved through memory sharing.
    * The call never fails.
    */
   #define XENMEM_get_sharing_freed_pages    18
   #define XENMEM_get_sharing_shared_pages   19
   
   #define XENMEM_paging_op                    20
   #define XENMEM_paging_op_nominate           0
   #define XENMEM_paging_op_evict              1
   #define XENMEM_paging_op_prep               2
   
   struct xen_mem_paging_op {
       uint8_t     op;         /* XENMEM_paging_op_* */
       domid_t     domain;
   
       /* IN: (XENMEM_paging_op_prep) buffer to immediately fill page from */
       XEN_GUEST_HANDLE_64(const_uint8) buffer;
       /* IN:  gfn of page being operated on */
       uint64_aligned_t    gfn;
   };
   typedef struct xen_mem_paging_op xen_mem_paging_op_t;
   DEFINE_XEN_GUEST_HANDLE(xen_mem_paging_op_t);
   
   #define XENMEM_access_op                    21
   #define XENMEM_access_op_set_access         0
   #define XENMEM_access_op_get_access         1
   /*
    * XENMEM_access_op_enable_emulate and XENMEM_access_op_disable_emulate are
    * currently unused, but since they have been in use please do not reuse them.
    *
    * #define XENMEM_access_op_enable_emulate     2
    * #define XENMEM_access_op_disable_emulate    3
    */
   #define XENMEM_access_op_set_access_multi   4
   
   typedef enum {
       XENMEM_access_n,
       XENMEM_access_r,
       XENMEM_access_w,
       XENMEM_access_rw,
       XENMEM_access_x,
       XENMEM_access_rx,
       XENMEM_access_wx,
       XENMEM_access_rwx,
       /*
        * Page starts off as r-x, but automatically
        * change to r-w on a write
        */
       XENMEM_access_rx2rw,
       /*
        * Log access: starts off as n, automatically
        * goes to rwx, generating an event without
        * pausing the vcpu
        */
       XENMEM_access_n2rwx,
       /* Take the domain default */
       XENMEM_access_default
   } xenmem_access_t;
   
   struct xen_mem_access_op {
       /* XENMEM_access_op_* */
       uint8_t op;
       /* xenmem_access_t */
       uint8_t access;
       domid_t domid;
       /*
        * Number of pages for set op (or size of pfn_list for
        * XENMEM_access_op_set_access_multi)
        * Ignored on setting default access and other ops
        */
       uint32_t nr;
       /*
        * First pfn for set op
        * pfn for get op
        * ~0ull is used to set and get the default access for pages
        */
       uint64_aligned_t pfn;
       /*
        * List of pfns to set access for
        * Used only with XENMEM_access_op_set_access_multi
        */
       XEN_GUEST_HANDLE(const_uint64) pfn_list;
       /*
        * Corresponding list of access settings for pfn_list
        * Used only with XENMEM_access_op_set_access_multi
        */
       XEN_GUEST_HANDLE(const_uint8) access_list;
   };
   typedef struct xen_mem_access_op xen_mem_access_op_t;
   DEFINE_XEN_GUEST_HANDLE(xen_mem_access_op_t);
   
   #define XENMEM_sharing_op                   22
   #define XENMEM_sharing_op_nominate_gfn      0
   #define XENMEM_sharing_op_nominate_gref     1
   #define XENMEM_sharing_op_share             2
   #define XENMEM_sharing_op_debug_gfn         3
   #define XENMEM_sharing_op_debug_mfn         4
   #define XENMEM_sharing_op_debug_gref        5
   #define XENMEM_sharing_op_add_physmap       6
   #define XENMEM_sharing_op_audit             7
   #define XENMEM_sharing_op_range_share       8
   #define XENMEM_sharing_op_fork              9
   #define XENMEM_sharing_op_fork_reset        10
   
   #define XENMEM_SHARING_OP_S_HANDLE_INVALID  (-10)
   #define XENMEM_SHARING_OP_C_HANDLE_INVALID  (-9)
   
   /* The following allows sharing of grant refs. This is useful
    * for sharing utilities sitting as "filters" in IO backends
    * (e.g. memshr + blktap(2)). The IO backend is only exposed
    * to grant references, and this allows sharing of the grefs */
   #define XENMEM_SHARING_OP_FIELD_IS_GREF_FLAG   (xen_mk_ullong(1) << 62)
   
   #define XENMEM_SHARING_OP_FIELD_MAKE_GREF(field, val)  \
       (field) = (XENMEM_SHARING_OP_FIELD_IS_GREF_FLAG | val)
   #define XENMEM_SHARING_OP_FIELD_IS_GREF(field)         \
       ((field) & XENMEM_SHARING_OP_FIELD_IS_GREF_FLAG)
   #define XENMEM_SHARING_OP_FIELD_GET_GREF(field)        \
       ((field) & (~XENMEM_SHARING_OP_FIELD_IS_GREF_FLAG))
   
   struct xen_mem_sharing_op {
       uint8_t     op;     /* XENMEM_sharing_op_* */
       domid_t     domain;
   
       union {
           struct mem_sharing_op_nominate {  /* OP_NOMINATE_xxx           */
               union {
                   uint64_aligned_t gfn;     /* IN: gfn to nominate       */
                   uint32_t      grant_ref;  /* IN: grant ref to nominate */
               } u;
               uint64_aligned_t  handle;     /* OUT: the handle           */
           } nominate;
           struct mem_sharing_op_share {     /* OP_SHARE/ADD_PHYSMAP */
               uint64_aligned_t source_gfn;    /* IN: the gfn of the source page */
               uint64_aligned_t source_handle; /* IN: handle to the source page */
               uint64_aligned_t client_gfn;    /* IN: the client gfn */
               uint64_aligned_t client_handle; /* IN: handle to the client page */
               domid_t  client_domain; /* IN: the client domain id */
           } share;
           struct mem_sharing_op_range {         /* OP_RANGE_SHARE */
               uint64_aligned_t first_gfn;      /* IN: the first gfn */
               uint64_aligned_t last_gfn;       /* IN: the last gfn */
               uint64_aligned_t opaque;         /* Must be set to 0 */
               domid_t client_domain;           /* IN: the client domain id */
               uint16_t _pad[3];                /* Must be set to 0 */
           } range;
           struct mem_sharing_op_debug {     /* OP_DEBUG_xxx */
               union {
                   uint64_aligned_t gfn;      /* IN: gfn to debug          */
                   uint64_aligned_t mfn;      /* IN: mfn to debug          */
                   uint32_t gref;     /* IN: gref to debug         */
               } u;
           } debug;
           struct mem_sharing_op_fork {      /* OP_FORK */
               domid_t parent_domain;        /* IN: parent's domain id */
   /* Only makes sense for short-lived forks */
   #define XENMEM_FORK_WITH_IOMMU_ALLOWED (1u << 0)
   /* Only makes sense for short-lived forks */
   #define XENMEM_FORK_BLOCK_INTERRUPTS   (1u << 1)
               uint16_t flags;               /* IN: optional settings */
               uint32_t pad;                 /* Must be set to 0 */
           } fork;
       } u;
   };
   typedef struct xen_mem_sharing_op xen_mem_sharing_op_t;
   DEFINE_XEN_GUEST_HANDLE(xen_mem_sharing_op_t);
   
   /*
    * Attempt to stake a claim for a domain on a quantity of pages
    * of system RAM, but _not_ assign specific pageframes.  Only
    * arithmetic is performed so the hypercall is very fast and need
    * not be preemptible, thus sidestepping time-of-check-time-of-use
    * races for memory allocation.  Returns 0 if the hypervisor page
    * allocator has atomically and successfully claimed the requested
    * number of pages, else non-zero.
    *
    * Any domain may have only one active claim.  When sufficient memory
    * has been allocated to resolve the claim, the claim silently expires.
    * Claiming zero pages effectively resets any outstanding claim and
    * is always successful.
    *
    * Note that a valid claim may be staked even after memory has been
    * allocated for a domain.  In this case, the claim is not incremental,
    * i.e. if the domain's total page count is 3, and a claim is staked
    * for 10, only 7 additional pages are claimed.
    *
    * Caller must be privileged or the hypercall fails.
    */
   #define XENMEM_claim_pages                  24
   
   /*
    * XENMEM_claim_pages flags - the are no flags at this time.
    * The zero value is appropriate.
    */
   
   /*
    * With some legacy devices, certain guest-physical addresses cannot safely
    * be used for other purposes, e.g. to map guest RAM.  This hypercall
    * enumerates those regions so the toolstack can avoid using them.
    */
   #define XENMEM_reserved_device_memory_map   27
   struct xen_reserved_device_memory {
       xen_pfn_t start_pfn;
       xen_ulong_t nr_pages;
   };
   typedef struct xen_reserved_device_memory xen_reserved_device_memory_t;
   DEFINE_XEN_GUEST_HANDLE(xen_reserved_device_memory_t);
   
   struct xen_reserved_device_memory_map {
   #define XENMEM_RDM_ALL 1 /* Request all regions (ignore dev union). */
       /* IN */
       uint32_t flags;
       /*
        * IN/OUT
        *
        * Gets set to the required number of entries when too low,
        * signaled by error code -ERANGE.
        */
       unsigned int nr_entries;
       /* OUT */
       XEN_GUEST_HANDLE(xen_reserved_device_memory_t) buffer;
       /* IN */
       union {
           physdev_pci_device_t pci;
       } dev;
   };
   typedef struct xen_reserved_device_memory_map xen_reserved_device_memory_map_t;
   DEFINE_XEN_GUEST_HANDLE(xen_reserved_device_memory_map_t);
   
   #endif /* defined(__XEN__) || defined(__XEN_TOOLS__) */
   
   /*
    * 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
   #define XENMEM_resource_vmtrace_buf 2
   
       /*
        * 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.
        * This value may be updated over the course of the operation.
        *
        * When frame_list is NULL and nr_frames is 0, this is interpreted as a
        * request for the size of the resource, which shall be returned in the
        * nr_frames field.
        *
        * The size of a resource will never be zero, but a nonzero result doesn't
        * guarantee that a subsequent mapping request will be successful.  There
        * are further type/id specific constraints which may change between the
        * two calls.
        */
       uint32_t nr_frames;
       uint32_t pad;
       /*
        * IN - the index of the initial frame to be mapped. This parameter
        *      is ignored if nr_frames is 0.  This value may be updated
        *      over the course of the operation.
        */
       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.  This
        *          value may be updated over the course of the operation.
        */
       XEN_GUEST_HANDLE(xen_pfn_t) frame_list;
   };
   typedef struct xen_mem_acquire_resource xen_mem_acquire_resource_t;
   DEFINE_XEN_GUEST_HANDLE(xen_mem_acquire_resource_t);
   
   /*
    * XENMEM_get_vnumainfo used by guest to get
    * vNUMA topology from hypervisor.
    */
   #define XENMEM_get_vnumainfo                26
   
   /* vNUMA node memory ranges */
   struct xen_vmemrange {
       uint64_t start, end;
       unsigned int flags;
       unsigned int nid;
   };
   typedef struct xen_vmemrange xen_vmemrange_t;
   DEFINE_XEN_GUEST_HANDLE(xen_vmemrange_t);
   
   /*
    * vNUMA topology specifies vNUMA node number, distance table,
    * memory ranges and vcpu mapping provided for guests.
    * XENMEM_get_vnumainfo hypercall expects to see from guest
    * nr_vnodes, nr_vmemranges and nr_vcpus to indicate available memory.
    * After filling guests structures, nr_vnodes, nr_vmemranges and nr_vcpus
    * copied back to guest. Domain returns expected values of nr_vnodes,
    * nr_vmemranges and nr_vcpus to guest if the values where incorrect.
    */
   struct xen_vnuma_topology_info {
       /* IN */
       domid_t domid;
       uint16_t pad;
       /* IN/OUT */
       unsigned int nr_vnodes;
       unsigned int nr_vcpus;
       unsigned int nr_vmemranges;
       /* OUT */
       union {
           XEN_GUEST_HANDLE(uint) h;
           uint64_t pad;
       } vdistance;
       union {
           XEN_GUEST_HANDLE(uint) h;
           uint64_t pad;
       } vcpu_to_vnode;
       union {
           XEN_GUEST_HANDLE(xen_vmemrange_t) h;
           uint64_t pad;
       } vmemrange;
   };
   typedef struct xen_vnuma_topology_info xen_vnuma_topology_info_t;
   DEFINE_XEN_GUEST_HANDLE(xen_vnuma_topology_info_t);
   
   /* Next available subop number is 29 */
   
   #endif /* __XEN_PUBLIC_MEMORY_H__ */
   
   /*
    * Local variables:
    * mode: C
    * c-file-style: "BSD"
    * c-basic-offset: 4
    * tab-width: 4
    * indent-tabs-mode: nil
    * End:
    */

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