ref: 9a7ee3a47de9b15b79d83fb3c5590acbc63114b3
dir: /sys/src/9/xen/xen-public/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"
/*
* 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)
#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.
*/
#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
/*
* 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 the maximum GPFN in use by the guest, or -ve errcode on failure.
*/
#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);
/*
* 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_range only. */
/* ` } */
/*
* 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;
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_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. */
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_range xen_add_to_physmap_range_t;
DEFINE_XEN_GUEST_HANDLE(xen_add_to_physmap_range_t);
/*
* 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;
};
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.
* 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
#define XENMEM_access_op 21
#define XENMEM_access_op_resume 0
struct xen_mem_event_op {
uint8_t op; /* XENMEM_*_op_* */
domid_t domain;
/* PAGING_PREP IN: buffer to immediately fill page in */
uint64_aligned_t buffer;
/* Other OPs */
uint64_aligned_t gfn; /* IN: gfn of page being operated on */
};
typedef struct xen_mem_event_op xen_mem_event_op_t;
DEFINE_XEN_GUEST_HANDLE(xen_mem_event_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_resume 3
#define XENMEM_sharing_op_debug_gfn 4
#define XENMEM_sharing_op_debug_mfn 5
#define XENMEM_sharing_op_debug_gref 6
#define XENMEM_sharing_op_add_physmap 7
#define XENMEM_sharing_op_audit 8
#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 (1ULL << 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_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;
} 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 tot_pages 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 appropiate.
*/
#endif /* defined(__XEN__) || defined(__XEN_TOOLS__) */
#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:
*/