Re: RFC/Proposal: Partial `libxenctrl` API/ABI stabilisation

[Ian Campbell <ian.campbell@citrix.com>]

On Mon, 2015-05-18 at 16:30 +0100, Ian Campbell wrote:
> % Partial `libxenctrl` API/ABI stabilisation

I really ought to have CC-d the other tools maintainers on this, done
here.

Note there are some minor updates in a reply to Andy Cooper too.

> % Ian Campbell <ian.campbell@citrix.com>
> % Draft A
> 
> # Introduction
> 
> The low-level `libxenctrl` library currently has an unstable API and
> ABI and some of the hypervisor interfaces which it exposes are
> similarly unstable.
> 
> However several external projects use some of these interfaces (at
> least: qemu and kexec-tools), which presents problems for distros and
> other consumers. In particular the need for spurious rebuilds of those
> components against newer versions of Xen and difficulty supporting
> parallel installation of different versions of Xen (useful during
> upgrade).
> 
> This document considers whether parts of `libxenctrl` can be split out
> into new libraries with more useful API and ABI guarantees.
> 
> XXX: I haven't yet done a full pass over the list of symbols in
> `libxenctrl` to categorise them and decide where they belong. I
> thought I would get some early feedback first and just picked a few
> representative examples for each library.
> 
> # ABI/API Compatibility Classes
> 
> Compatibility opportunities:
> 
> * `LAPI` -- Library API
> * `LABI` -- Library ABI
> * `HABI` -- Hypervisor ABI (includes ioctls).
> 
> Each can either be Stable (`S`), Unstable (`U`) or don't care (`x`,
> because made moot by higher level interface class, e.g. no real point
> from an application PoV to a Stable HABI behind a unstable LABI).
> 
> Stable vs. Unstable is across major hypervisor version bump, always
> aim to be stable across point releases.
> 
> For libraries Stable means `SONAME` major component, but forward
> compatible only (i.e. old app on new library works, new app on old
> library may not link due to e.g. new symbols. This is the normal
> SONAME expectation). XXX find a link to the sort of scheme I mean.
> 
> `HABI` may include ioctls used to access those ABIs, typically these
> are already required to be stable by the relevant OS maintainers.
> 
> A library interface may fall into one of these categories (I expect
> there are others and we may not want any library to use some of even
> these):
> 
> * Unstable `LAPI` (`Uxx`)
>     * The Wild West
>     * Current Examples: `libxenctrl`
> 
> * Stable `LAPI`, Unstable `LABI` (`SUx`)
>     * Requires application rebuild for a new Xen version, but not
>       application source code changes.
>     * Current Examples: `libxenlight`
> 
> * Stable `LAPI`, Stable `LABI`, Unstable `HABI` (`SSU`)
>     * Library can be switched out via dynamic linking across
>       hypervisor upgrade (mechanism TBD, pos. distro specific, e.g.
>       symlink switched on boot). Requires application/daemon restart
>       but not rebuild (but changing hypervisor version involves a
>       reboot anyway).
>     * Current Examples: None??
> 
> * Stable `LAPI`, Stable `LABI`, Stable `HABI` (`SSS`)
>     * Applications linked again a library will function against any
>       hypervisor version.
>     * Current Examples: None??
> 
> # Goal
> 
> Provide `SSU` or `SSS` interfaces for major external consumers of
> current libxenctrl functionality.
> 
> Out of scope (for now): `SSU` or `SSS` interfaces for consumers of
> `libxenlight`. Rationale: Lets focus on fixing external consumers of
> libxenctrl first.
> 
> # Major External Consumers of `libxenctrl`
> 
> * qemu
> * kexec tools
> * in guest tools e.g. users of `libxenstore`, `libvchan`, and by
>   extension `grant table` and `event channel` functionality. NB:
>   `libxenstore` is already `SSU` or `SSS` (XXX?)
> 
> # `libxenctrl` symbols
> 
> Gathered by:
> 
>     nm tools/libxc/libxenctrl.so | grep ' [Tt] ' | cut -f 3 -d \ | sort -u
> 
> `libxenctrl` today exposes many symbols which look to be internal. We
> should consider also reducing that set by using
> `__attribute__((visibility("hidden")))`.
> 
> The following proposes some functional groupings via some proposed
> split library names. In some cases we may also wish to consider
> replacing an API with one which can be properly maintained going
> forwards. e.g.:
> 
> - perhaps replacing domctl's used by qemu with new stable
>   hypercall ABIs and reflecting that in new library APIs.
> - perhaps exposing more constrained versions of some broad interfaces
>   for external users.
> 
> XXX: Change `xc_*` namespacing as well as library names?
> 
> ## `libxenhypercall`
> 
> Core open/close interface, "make a hypercall" functionality, hypercall
> buffers.
> 
> All other libraries likely depend on this. Applications do as well in
> order to access open/close interface at least.
> 
>     - xc_interface_close
>     - xc_interface_is_fake (???)
>     - xc_interface_open
>     - xc_hypercall_buffer_array_create
>     - xc_hypercall_buffer_array_destroy
> 
> ## `libxenevtchn`
> 
> Interacting with `/dev/xen/evtchn`
> 
>     - xc_evtchn_alloc_unbound
>     - xc_evtchn_bind_interdomain
>     - xc_evtchn_bind_unbound_port
>     - xc_evtchn_bind_virq
>     - xc_evtchn_close
>     - xc_evtchn_fd
>     - xc_evtchn_notify
>     - xc_evtchn_open
>     - xc_evtchn_pending
>     - xc_evtchn_reset
>     - xc_evtchn_status
>     - xc_evtchn_unbind
>     - xc_evtchn_unmask
> 
> ## `libxengnttab`
> 
> Interacting with `/dev/xen/gnt{shr,alloc}`
> 
> XXX two libs or one?
> 
>     - xc_gntshr_close
>     - xc_gntshr_munmap
>     - xc_gntshr_open
>     - xc_gntshr_share_page_notify
>     - xc_gntshr_share_pages
>     - xc_gnttab_close
>     - xc_gnttab_get_version
>     - xc_gnttab_map_domain_grant_refs
>     - xc_gnttab_map_grant_ref
>     - xc_gnttab_map_grant_ref_notify
>     - xc_gnttab_map_grant_refs
>     - xc_gnttab_map_table_v1
>     - xc_gnttab_map_table_v2
>     - xc_gnttab_munmap
>     - xc_gnttab_op
>     - xc_gnttab_open
>     - xc_gnttab_set_max_grants
> 
> ## `libxendevicemodel`
> 
> Functions specifically for use by device model
> 
> ## `libxenkexec`
> 
> Functions specifically for use by kexec tools
> 	
>     - xc_kexec_exec
>     - xc_kexec_get_range
>     - xc_kexec_load
>     - xc_kexec_unload
> 
> ## `libxentoollog`
> 
> Logging stuff (already logically separate?)
> 
>     - xtl_createlogger_stdiostream
>     - xtl_level_to_string
>     - xtl_log
>     - xtl_logger_destroy
>     - xtl_logv
>     - xtl_progress
>     - xtl_stdiostream_adjust_flags
>     - xtl_stdiostream_set_minlevel
> 
> ## `libxenctrl` (Unclassified remains)
> 
> XXX Lots of this should be internal/hidden
> 
>     - bitmap_64_to_byte
>     - bitmap_byte_to_64
>     - call_gmon_start
>     - deregister_tm_clones
>     - discard_file_cache
>     - do_domctl
>     - do_evtchn_op
>     - __do_global_dtors_aux
>     - __do_global_dtors_aux_fini_array_entry
>     - do_memory_op
>     - do_multicall_op
>     - do_physdev_op
>     - do_platform_op
>     - do_sysctl
>     - do_sysctl_save
>     - do_tmem_op
>     - do_xen_hypercall
>     - do_xen_version
>     - elfnote_dump_core_header
>     - elfnote_dump_format_version
>     - elfnote_dump_none
>     - elfnote_dump_xen_version
>     - elfnote_fill_format_version
>     - elfnote_fill_xen_version
>     - elfnote_init
>     - _fini
>     - flush_mmu_updates
>     - frame_dummy
>     - __frame_dummy_init_array_entry
>     - _gnttab_map_table
>     - hypercall_buffer_cache_alloc
>     - hypercall_buffer_cache_free
>     - hypercall_buffer_cache_lock
>     - hypercall_buffer_cache_unlock
>     - _init
>     - linux_evtchn_bind_interdomain
>     - linux_evtchn_bind_unbound_port
>     - linux_evtchn_bind_virq
>     - linux_evtchn_close
>     - linux_evtchn_fd
>     - linux_evtchn_notify
>     - linux_evtchn_open
>     - linux_evtchn_pending
>     - linux_evtchn_unbind
>     - linux_evtchn_unmask
>     - linux_gntshr_close
>     - linux_gntshr_munmap
>     - linux_gntshr_open
>     - linux_gntshr_share_pages
>     - linux_gnttab_close
>     - linux_gnttab_grant_map
>     - linux_gnttab_munmap
>     - linux_gnttab_open
>     - linux_gnttab_set_max_grants
>     - linux_osdep_init
>     - linux_privcmd_alloc_hypercall_buffer
>     - linux_privcmd_close
>     - linux_privcmd_free_hypercall_buffer
>     - linux_privcmd_hypercall
>     - linux_privcmd_map_foreign_batch
>     - linux_privcmd_map_foreign_bulk
>     - linux_privcmd_map_foreign_range
>     - linux_privcmd_map_foreign_ranges
>     - linux_privcmd_open
>     - local_file_dump
>     - modify_returncode
>     - progress_erase
>     - read_exact
>     - register_tm_clones
>     - retry_paged
>     - stdiostream_destroy
>     - stdiostream_message
>     - stdiostream_progress
>     - stdiostream_vmessage
>     - tbuf_enable
>     - VALGRIND_PRINTF
>     - VALGRIND_PRINTF_BACKTRACE
>     - write_exact
>     - writev_exact
>     - xc_add_mmu_update
>     - xc_alloc_mmu_updates
>     - xc_assign_device
>     - xc_assign_dt_device
>     - xc_availheap
>     - _xc_clean_errbuf
>     - xc_clear_domain_pages
>     - xc_clear_last_error
>     - xc_copy_to_domain_page
>     - xc_core_arch_auto_translated_physmap
>     - xc_core_arch_context_get_shdr
>     - xc_core_arch_get_scratch_gpfn
>     - xc_core_arch_gpfn_may_present
>     - xc_core_arch_map_p2m
>     - xc_core_arch_map_p2m_rw
>     - xc_core_arch_map_p2m_writable
>     - xc_core_arch_memory_map_get
>     - xc_core_ehdr_init
>     - xc_core_shdr_free
>     - xc_core_shdr_get
>     - xc_core_shdr_init
>     - xc_core_shdr_set
>     - xc_core_strtab_free
>     - xc_core_strtab_get
>     - xc_core_strtab_init
>     - xc_cpumap_alloc
>     - xc_cpumap_clearcpu
>     - xc_cpumap_setcpu
>     - xc_cpumap_testcpu
>     - xc_cpu_offline
>     - xc_cpu_online
>     - xc_cpupool_addcpu
>     - xc_cpupool_create
>     - xc_cpupool_destroy
>     - xc_cpupool_freeinfo
>     - xc_cpupool_getinfo
>     - xc_cpupool_infofree
>     - xc_cpupool_movedomain
>     - xc_cpupool_removecpu
>     - xc_cputopoinfo
>     - xc_deassign_device
>     - xc_deassign_dt_device
>     - xc_disable_turbo
>     - xc_domain_add_to_physmap
>     - xc_domain_bind_pt_irq
>     - xc_domain_bind_pt_irq_int
>     - xc_domain_bind_pt_isa_irq
>     - xc_domain_bind_pt_pci_irq
>     - xc_domain_bind_pt_spi_irq
>     - xc_domain_cacheflush
>     - xc_domain_claim_pages
>     - xc_domain_create
>     - xc_domain_create_config
>     - xc_domain_debug_control
>     - xc_domain_decrease_reservation
>     - xc_domain_decrease_reservation_exact
>     - xc_domain_destroy
>     - xc_domain_disable_migrate
>     - xc_domain_dumpcore
>     - xc_domain_dumpcore_via_callback
>     - xc_domain_get_cpu_usage
>     - xc_domain_get_guest_width
>     - xc_domain_getinfo
>     - xc_domain_getinfolist
>     - xc_domain_get_machine_address_size
>     - xc_domain_get_pod_target
>     - xc_domain_get_tsc_info
>     - xc_domain_hvm_getcontext
>     - xc_domain_hvm_getcontext_partial
>     - xc_domain_hvm_setcontext
>     - xc_domain_increase_reservation
>     - xc_domain_increase_reservation_exact
>     - xc_domain_iomem_permission
>     - xc_domain_ioport_mapping
>     - xc_domain_ioport_permission
>     - xc_domain_irq_permission
>     - xc_domain_maximum_gpfn
>     - xc_domain_max_vcpus
>     - xc_domain_memory_exchange_pages
>     - xc_domain_memory_mapping
>     - xc_domain_node_getaffinity
>     - xc_domain_node_setaffinity
>     - xc_domain_nr_gpfns
>     - xc_domain_p2m_audit
>     - xc_domain_pause
>     - xc_domain_pin_memory_cacheattr
>     - xc_domain_pod_target
>     - xc_domain_populate_physmap
>     - xc_domain_populate_physmap_exact
>     - xc_domain_resume
>     - xc_domain_resume_any
>     - xc_domain_resume_cooperative
>     - xc_domain_send_trigger
>     - xc_domain_set_access_required
>     - xc_domain_setdebugging
>     - xc_domain_sethandle
>     - xc_domain_set_machine_address_size
>     - xc_domain_set_max_evtchn
>     - xc_domain_setmaxmem
>     - xc_domain_set_memmap_limit
>     - xc_domain_set_memory_map
>     - xc_domain_set_pod_target
>     - xc_domain_set_target
>     - xc_domain_set_time_offset
>     - xc_domain_set_tsc_info
>     - xc_domain_set_virq_handler
>     - xc_domain_setvnuma
>     - xc_domain_shutdown
>     - xc_domain_subscribe_for_suspend
>     - xc_domain_suppress_spurious_page_faults
>     - xc_domain_unbind_msi_irq
>     - xc_domain_unbind_pt_irq
>     - xc_domain_unbind_pt_irq_int
>     - xc_domain_unbind_pt_spi_irq
>     - xc_domain_unpause
>     - xc_domain_update_msi_irq
>     - xc_domctl
>     - xc_enable_turbo
>     - xc_error_code_to_desc
>     - xc_ffs16
>     - xc_ffs32
>     - xc_ffs64
>     - xc_ffs8
>     - xc_flask_access
>     - xc_flask_add
>     - xc_flask_add_device
>     - xc_flask_add_iomem
>     - xc_flask_add_ioport
>     - xc_flask_add_pirq
>     - xc_flask_avc_cachestats
>     - xc_flask_avc_hashstats
>     - xc_flask_context_to_sid
>     - xc_flask_del
>     - xc_flask_del_device
>     - xc_flask_del_iomem
>     - xc_flask_del_ioport
>     - xc_flask_del_pirq
>     - xc_flask_getavc_threshold
>     - xc_flask_getbool_byid
>     - xc_flask_getbool_byname
>     - xc_flask_getenforce
>     - xc_flask_load
>     - xc_flask_op
>     - xc_flask_policyvers
>     - xc_flask_relabel_domain
>     - xc_flask_setavc_threshold
>     - xc_flask_setbool
>     - xc_flask_setenforce
>     - xc_flask_sid_to_context
>     - xc_flush_mmu_updates
>     - xc_get_cpufreq_avgfreq
>     - xc_get_cpufreq_para
>     - xc_get_cpuidle_max_cstate
>     - xc_getcpuinfo
>     - xc_get_cpumap_size
>     - xc_get_device_group
>     - xc_get_hvm_param
>     - xc_get_last_error
>     - xc_get_machine_memory_map
>     - xc_get_max_cpus
>     - xc_get_max_nodes
>     - xc_get_mem_access
>     - xc_get_nodemap_size
>     - xc_get_online_cpus
>     - xc_get_pfn_list
>     - xc_get_pfn_type_batch
>     - xc_get_tot_pages
>     - xc_get_vcpu_migration_delay
>     - xc_hvm_create_ioreq_server
>     - xc_hvm_destroy_ioreq_server
>     - xc_hvm_get_ioreq_server_info
>     - xc_hvm_inject_msi
>     - xc_hvm_inject_trap
>     - xc_hvm_map_io_range_to_ioreq_server
>     - xc_hvm_map_pcidev_to_ioreq_server
>     - xc_hvm_modified_memory
>     - xc_hvm_param_deprecated_check
>     - xc_hvm_param_get
>     - xc_hvm_param_set
>     - xc_hvm_set_ioreq_server_state
>     - xc_hvm_set_isa_irq_level
>     - xc_hvm_set_mem_type
>     - xc_hvm_set_pci_intx_level
>     - xc_hvm_set_pci_link_route
>     - xc_hvm_track_dirty_vram
>     - xc_hvm_unmap_io_range_from_ioreq_server
>     - xc_hvm_unmap_pcidev_from_ioreq_server
>     - xc__hypercall_bounce_post
>     - xc__hypercall_bounce_pre
>     - xc__hypercall_buffer_alloc
>     - xc__hypercall_buffer_alloc_pages
>     - xc__hypercall_buffer_array_alloc
>     - xc__hypercall_buffer_array_get
>     - xc__hypercall_buffer_cache_release
>     - xc__hypercall_buffer_free
>     - xc__hypercall_buffer_free_pages
>     - _xc_init_errbuf
>     - xc_interface_close
>     - xc_interface_close_common
>     - xc_interface_is_fake
>     - xc_interface_open
>     - xc_interface_open_common
>     - xc_lockprof_query
>     - xc_lockprof_query_number
>     - xc_lockprof_reset
>     - xc_machphys_mfn_list
>     - xc_make_page_below_4G
>     - xc_map_domain_meminfo
>     - xc_map_foreign_batch
>     - xc_map_foreign_batch_single
>     - xc_map_foreign_bulk
>     - xc_map_foreign_bulk_compat
>     - xc_map_foreign_pages
>     - xc_map_foreign_range
>     - xc_map_foreign_ranges
>     - xc_maximum_ram_page
>     - xc_mca_op
>     - xc_mem_access_disable_emulate
>     - xc_mem_access_enable_emulate
>     - xc_memalign
>     - xc_mem_paging_disable
>     - xc_mem_paging_enable
>     - xc_mem_paging_evict
>     - xc_mem_paging_load
>     - xc_mem_paging_memop
>     - xc_mem_paging_nominate
>     - xc_mem_paging_prep
>     - xc_mem_paging_resume
>     - xc_memshr_add_to_physmap
>     - xc_memshr_audit
>     - xc_memshr_control
>     - xc_memshr_debug_gfn
>     - xc_memshr_debug_gref
>     - xc_memshr_domain_resume
>     - xc_memshr_memop
>     - xc_memshr_nominate_gfn
>     - xc_memshr_nominate_gref
>     - xc_memshr_ring_disable
>     - xc_memshr_ring_enable
>     - xc_memshr_share_gfns
>     - xc_memshr_share_grefs
>     - xc_mmuext_op
>     - xc_monitor_disable
>     - xc_monitor_enable
>     - xc_monitor_mov_to_cr0
>     - xc_monitor_mov_to_cr3
>     - xc_monitor_mov_to_cr4
>     - xc_monitor_mov_to_msr
>     - xc_monitor_resume
>     - xc_monitor_singlestep
>     - xc_monitor_software_breakpoint
>     - xc_nodemap_alloc
>     - xc_numainfo
>     - xc_osdep_get_info
>     - xc_osdep_log
>     - xc_osdep_put
>     - xc_osdep_type_name
>     - xc_pcitopoinfo
>     - xc_perfc_query
>     - xc_perfc_query_number
>     - xc_perfc_reset
>     - xc_pfn_to_mfn
>     - xc_physdev_map_pirq
>     - xc_physdev_map_pirq_msi
>     - xc_physdev_pci_access_modify
>     - xc_physdev_unmap_pirq
>     - xc_physinfo
>     - xc_pm_get_cxstat
>     - xc_pm_get_max_cx
>     - xc_pm_get_max_px
>     - xc_pm_get_pxstat
>     - xc_pm_reset_cxstat
>     - xc_pm_reset_pxstat
>     - xc_psr_cmt_attach
>     - xc_psr_cmt_detach
>     - xc_psr_cmt_enabled
>     - xc_psr_cmt_get_data
>     - xc_psr_cmt_get_domain_rmid
>     - xc_psr_cmt_get_l3_cache_size
>     - xc_psr_cmt_get_l3_event_mask
>     - xc_psr_cmt_get_l3_upscaling_factor
>     - xc_psr_cmt_get_total_rmid
>     - xc_readconsolering
>     - xc_report
>     - xc_report_error
>     - xc_report_progress_single
>     - xc_report_progress_step
>     - xc_reportv
>     - xc_resource_op
>     - xc_resource_op_multi
>     - xc_resource_op_one
>     - xc_sched_arinc653_schedule_get
>     - xc_sched_arinc653_schedule_set
>     - xc_sched_credit2_domain_get
>     - xc_sched_credit2_domain_set
>     - xc_sched_credit_domain_get
>     - xc_sched_credit_domain_set
>     - xc_sched_credit_params_get
>     - xc_sched_credit_params_set
>     - xc_sched_id
>     - xc_sched_rtds_domain_get
>     - xc_sched_rtds_domain_set
>     - xc_sedf_domain_get
>     - xc_sedf_domain_set
>     - xc_send_debug_keys
>     - xc_set_broken_page_p2m
>     - xc_set_cpufreq_gov
>     - xc_set_cpufreq_para
>     - xc_set_cpuidle_max_cstate
>     - xc_set_hvm_param
>     - xc_set_mem_access
>     - xc_set_progress_prefix
>     - xc_set_sched_opt_smt
>     - xc_set_vcpu_migration_delay
>     - xc_shadow_control
>     - xc_sharing_freed_pages
>     - xc_sharing_used_frames
>     - xc_strerror
>     - xc_sysctl
>     - xc_tbuf_disable
>     - xc_tbuf_enable
>     - xc_tbuf_get_size
>     - xc_tbuf_set_cpu_mask
>     - xc_tbuf_set_evt_mask
>     - xc_tbuf_set_size
>     - xc_test_assign_device
>     - xc_test_assign_dt_device
>     - xc_tmem_auth
>     - xc_tmem_control
>     - xc_tmem_control_oid
>     - xc_tmem_restore
>     - xc_tmem_restore_extra
>     - xc_tmem_restore_new_pool
>     - xc_tmem_save
>     - xc_tmem_save_done
>     - xc_tmem_save_extra
>     - xc_tmem_uuid_parse
>     - xc_translate_foreign_address
>     - xc_unmap_domain_meminfo
>     - xc_vcpu_getaffinity
>     - xc_vcpu_getcontext
>     - xc_vcpu_getinfo
>     - xc_vcpu_setaffinity
>     - xc_vcpu_setcontext
>     - xc_version
>     - xc_vm_event_control
>     - xc_vm_event_enable
>     - xc_watchdog
>     - xc_interface_close_common
>     - xc_interface_open_common
> 
> # Symbols used by qemu
> 
>     $ nm tools/qemu-xen-dir-remote/i386-softmmu/qemu-system-i386 | grep \\bU.xc_
> 
>     - xc_domain_add_to_physmap
>     - xc_domain_bind_pt_pci_irq
>     - xc_domain_create
>     - xc_domain_destroy
>     - xc_domain_getinfo
>     - xc_domain_ioport_mapping
>     - xc_domain_max_vcpus
>     - xc_domain_memory_mapping
>     - xc_domain_pin_memory_cacheattr
>     - xc_domain_populate_physmap_exact
>     - xc_domain_setmaxmem
>     - xc_domain_shutdown
>     - xc_domain_unbind_msi_irq
>     - xc_domain_unbind_pt_irq
>     - xc_domain_unpause
>     - xc_domain_update_msi_irq
>     - xc_evtchn_alloc_unbound
>     - xc_evtchn_bind_interdomain
>     - xc_evtchn_close
>     - xc_evtchn_fd
>     - xc_evtchn_notify
>     - xc_evtchn_open
>     - xc_evtchn_pending
>     - xc_evtchn_unbind
>     - xc_evtchn_unmask
>     - xc_get_hvm_param
>     - xc_gnttab_close
>     - xc_gnttab_map_grant_ref
>     - xc_gnttab_map_grant_refs
>     - xc_gnttab_munmap
>     - xc_gnttab_open
>     - xc_gnttab_set_max_grants
>     - xc_hvm_inject_msi
>     - xc_hvm_modified_memory
>     - xc_hvm_set_isa_irq_level
>     - xc_hvm_set_mem_type
>     - xc_hvm_set_pci_intx_level
>     - xc_hvm_set_pci_link_route
>     - xc_hvm_track_dirty_vram
>     - xc_interface_close
>     - xc_interface_open
>     - xc_linux_build
>     - xc_map_foreign_bulk
>     - xc_map_foreign_pages
>     - xc_map_foreign_range
>     - xc_physdev_map_pirq
>     - xc_physdev_map_pirq_msi
>     - xc_physdev_unmap_pirq
>     - xc_set_hvm_param
> 
> # Symbols used by kexec
> 
>     - xc__hypercall_buffer_array_alloc
>     - xc_get_machine_memory_map
>     - xc_get_max_cpus
>     - xc_hypercall_buffer_array_create
>     - xc_hypercall_buffer_array_destroy
>     - xc_interface_close
>     - xc_interface_open
>     - xc_kexec_exec
>     - xc_kexec_get_range
>     - xc_kexec_load
>     - xc_kexec_unload
>     - xc_version
> 
> 
> 
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