| /****************************************************************************** |
| * 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). */ |
| unsigned long 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! |
| */ |
| unsigned long 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 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. |
| */ |
| 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 12 |
| struct xen_machphys_mapping { |
| unsigned long v_start, v_end; /* Start and end virtual addresses. */ |
| unsigned long max_mfn; /* Maximum MFN that can be looked up. */ |
| }; |
| DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mapping_t); |
| |
| /* |
| * 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. */ |
| #define XENMAPSPACE_shared_info 0 /* shared info page */ |
| #define XENMAPSPACE_grant_table 1 /* grant table page */ |
| unsigned int space; |
| |
| /* Index into source mapping space. */ |
| unsigned long idx; |
| |
| /* GPFN where the source mapping page should appear. */ |
| xen_pfn_t gpfn; |
| }; |
| DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap); |
| |
| /* |
| * Translates a list of domain-specific GPFNs into MFNs. Returns a -ve error |
| * code on failure. This call only works for auto-translated guests. |
| */ |
| #define XENMEM_translate_gpfn_list 8 |
| struct xen_translate_gpfn_list { |
| /* Which domain to translate for? */ |
| domid_t domid; |
| |
| /* Length of list. */ |
| unsigned long nr_gpfns; |
| |
| /* List of GPFNs to translate. */ |
| GUEST_HANDLE(ulong) gpfn_list; |
| |
| /* |
| * Output list to contain MFN translations. May be the same as the input |
| * list (in which case each input GPFN is overwritten with the output MFN). |
| */ |
| GUEST_HANDLE(ulong) mfn_list; |
| }; |
| DEFINE_GUEST_HANDLE_STRUCT(xen_translate_gpfn_list); |
| |
| /* |
| * 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 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; |
| #endif /* __XEN_PUBLIC_MEMORY_H__ */ |