The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/xen/interface/vcpu.h

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    1 /******************************************************************************
    2  * vcpu.h
    3  *
    4  * VCPU initialisation, query, and hotplug.
    5  *
    6  * Permission is hereby granted, free of charge, to any person obtaining a copy
    7  * of this software and associated documentation files (the "Software"), to
    8  * deal in the Software without restriction, including without limitation the
    9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   10  * sell copies of the Software, and to permit persons to whom the Software is
   11  * furnished to do so, subject to the following conditions:
   12  *
   13  * The above copyright notice and this permission notice shall be included in
   14  * all copies or substantial portions of the Software.
   15  *
   16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   22  * DEALINGS IN THE SOFTWARE.
   23  *
   24  * Copyright (c) 2005, Keir Fraser <keir@xensource.com>
   25  */
   26 
   27 #ifndef __XEN_PUBLIC_VCPU_H__
   28 #define __XEN_PUBLIC_VCPU_H__
   29 
   30 #include "xen.h"
   31 
   32 /*
   33  * Prototype for this hypercall is:
   34  *  long vcpu_op(int cmd, unsigned int vcpuid, void *extra_args)
   35  * @cmd        == VCPUOP_??? (VCPU operation).
   36  * @vcpuid     == VCPU to operate on.
   37  * @extra_args == Operation-specific extra arguments (NULL if none).
   38  */
   39 
   40 /*
   41  * Initialise a VCPU. Each VCPU can be initialised only once. A
   42  * newly-initialised VCPU will not run until it is brought up by VCPUOP_up.
   43  *
   44  * @extra_arg == For PV or ARM guests this is a pointer to a vcpu_guest_context
   45  *               structure containing the initial state for the VCPU. For x86
   46  *               HVM based guests this is a pointer to a vcpu_hvm_context
   47  *               structure.
   48  */
   49 #define VCPUOP_initialise            0
   50 
   51 /*
   52  * Bring up a VCPU. This makes the VCPU runnable. This operation will fail
   53  * if the VCPU has not been initialised (VCPUOP_initialise).
   54  */
   55 #define VCPUOP_up                    1
   56 
   57 /*
   58  * Bring down a VCPU (i.e., make it non-runnable).
   59  * There are a few caveats that callers should observe:
   60  *  1. This operation may return, and VCPU_is_up may return false, before the
   61  *     VCPU stops running (i.e., the command is asynchronous). It is a good
   62  *     idea to ensure that the VCPU has entered a non-critical loop before
   63  *     bringing it down. Alternatively, this operation is guaranteed
   64  *     synchronous if invoked by the VCPU itself.
   65  *  2. After a VCPU is initialised, there is currently no way to drop all its
   66  *     references to domain memory. Even a VCPU that is down still holds
   67  *     memory references via its pagetable base pointer and GDT. It is good
   68  *     practise to move a VCPU onto an 'idle' or default page table, LDT and
   69  *     GDT before bringing it down.
   70  */
   71 #define VCPUOP_down                  2
   72 
   73 /* Returns 1 if the given VCPU is up. */
   74 #define VCPUOP_is_up                 3
   75 
   76 /*
   77  * Return information about the state and running time of a VCPU.
   78  * @extra_arg == pointer to vcpu_runstate_info structure.
   79  */
   80 #define VCPUOP_get_runstate_info     4
   81 struct vcpu_runstate_info {
   82     /* VCPU's current state (RUNSTATE_*). */
   83     int      state;
   84     /* When was current state entered (system time, ns)? */
   85     uint64_t state_entry_time;
   86     /*
   87      * Update indicator set in state_entry_time:
   88      * When activated via VMASST_TYPE_runstate_update_flag, set during
   89      * updates in guest memory mapped copy of vcpu_runstate_info.
   90      */
   91 #define XEN_RUNSTATE_UPDATE          (xen_mk_ullong(1) << 63)
   92     /*
   93      * Time spent in each RUNSTATE_* (ns). The sum of these times is
   94      * guaranteed not to drift from system time.
   95      */
   96     uint64_t time[4];
   97 };
   98 typedef struct vcpu_runstate_info vcpu_runstate_info_t;
   99 DEFINE_XEN_GUEST_HANDLE(vcpu_runstate_info_t);
  100 
  101 /* VCPU is currently running on a physical CPU. */
  102 #define RUNSTATE_running  0
  103 
  104 /* VCPU is runnable, but not currently scheduled on any physical CPU. */
  105 #define RUNSTATE_runnable 1
  106 
  107 /* VCPU is blocked (a.k.a. idle). It is therefore not runnable. */
  108 #define RUNSTATE_blocked  2
  109 
  110 /*
  111  * VCPU is not runnable, but it is not blocked.
  112  * This is a 'catch all' state for things like hotplug and pauses by the
  113  * system administrator (or for critical sections in the hypervisor).
  114  * RUNSTATE_blocked dominates this state (it is the preferred state).
  115  */
  116 #define RUNSTATE_offline  3
  117 
  118 /*
  119  * Register a shared memory area from which the guest may obtain its own
  120  * runstate information without needing to execute a hypercall.
  121  * Notes:
  122  *  1. The registered address may be virtual or physical or guest handle,
  123  *     depending on the platform. Virtual address or guest handle should be
  124  *     registered on x86 systems.
  125  *  2. Only one shared area may be registered per VCPU. The shared area is
  126  *     updated by the hypervisor each time the VCPU is scheduled. Thus
  127  *     runstate.state will always be RUNSTATE_running and
  128  *     runstate.state_entry_time will indicate the system time at which the
  129  *     VCPU was last scheduled to run.
  130  * @extra_arg == pointer to vcpu_register_runstate_memory_area structure.
  131  */
  132 #define VCPUOP_register_runstate_memory_area 5
  133 struct vcpu_register_runstate_memory_area {
  134     union {
  135         XEN_GUEST_HANDLE(vcpu_runstate_info_t) h;
  136         struct vcpu_runstate_info *v;
  137         uint64_t p;
  138     } addr;
  139 };
  140 typedef struct vcpu_register_runstate_memory_area vcpu_register_runstate_memory_area_t;
  141 DEFINE_XEN_GUEST_HANDLE(vcpu_register_runstate_memory_area_t);
  142 
  143 /*
  144  * Set or stop a VCPU's periodic timer. Every VCPU has one periodic timer
  145  * which can be set via these commands. Periods smaller than one millisecond
  146  * may not be supported.
  147  */
  148 #define VCPUOP_set_periodic_timer    6 /* arg == vcpu_set_periodic_timer_t */
  149 #define VCPUOP_stop_periodic_timer   7 /* arg == NULL */
  150 struct vcpu_set_periodic_timer {
  151     uint64_t period_ns;
  152 };
  153 typedef struct vcpu_set_periodic_timer vcpu_set_periodic_timer_t;
  154 DEFINE_XEN_GUEST_HANDLE(vcpu_set_periodic_timer_t);
  155 
  156 /*
  157  * Set or stop a VCPU's single-shot timer. Every VCPU has one single-shot
  158  * timer which can be set via these commands.
  159  */
  160 #define VCPUOP_set_singleshot_timer  8 /* arg == vcpu_set_singleshot_timer_t */
  161 #define VCPUOP_stop_singleshot_timer 9 /* arg == NULL */
  162 struct vcpu_set_singleshot_timer {
  163     uint64_t timeout_abs_ns;   /* Absolute system time value in nanoseconds. */
  164     uint32_t flags;            /* VCPU_SSHOTTMR_??? */
  165 };
  166 typedef struct vcpu_set_singleshot_timer vcpu_set_singleshot_timer_t;
  167 DEFINE_XEN_GUEST_HANDLE(vcpu_set_singleshot_timer_t);
  168 
  169 /* Flags to VCPUOP_set_singleshot_timer. */
  170  /* Require the timeout to be in the future (return -ETIME if it's passed). */
  171 #define _VCPU_SSHOTTMR_future (0)
  172 #define VCPU_SSHOTTMR_future  (1U << _VCPU_SSHOTTMR_future)
  173 
  174 /*
  175  * Register a memory location in the guest address space for the
  176  * vcpu_info structure.  This allows the guest to place the vcpu_info
  177  * structure in a convenient place, such as in a per-cpu data area.
  178  * The pointer need not be page aligned, but the structure must not
  179  * cross a page boundary.
  180  *
  181  * This may be called only once per vcpu.
  182  */
  183 #define VCPUOP_register_vcpu_info   10  /* arg == vcpu_register_vcpu_info_t */
  184 struct vcpu_register_vcpu_info {
  185     uint64_t mfn;    /* mfn of page to place vcpu_info */
  186     uint32_t offset; /* offset within page */
  187     uint32_t rsvd;   /* unused */
  188 };
  189 typedef struct vcpu_register_vcpu_info vcpu_register_vcpu_info_t;
  190 DEFINE_XEN_GUEST_HANDLE(vcpu_register_vcpu_info_t);
  191 
  192 /* Send an NMI to the specified VCPU. @extra_arg == NULL. */
  193 #define VCPUOP_send_nmi             11
  194 
  195 /*
  196  * Get the physical ID information for a pinned vcpu's underlying physical
  197  * processor.  The physical ID informmation is architecture-specific.
  198  * On x86: id[31:0]=apic_id, id[63:32]=acpi_id.
  199  * This command returns -EINVAL if it is not a valid operation for this VCPU.
  200  */
  201 #define VCPUOP_get_physid           12 /* arg == vcpu_get_physid_t */
  202 struct vcpu_get_physid {
  203     uint64_t phys_id;
  204 };
  205 typedef struct vcpu_get_physid vcpu_get_physid_t;
  206 DEFINE_XEN_GUEST_HANDLE(vcpu_get_physid_t);
  207 #define xen_vcpu_physid_to_x86_apicid(physid) ((uint32_t)(physid))
  208 #define xen_vcpu_physid_to_x86_acpiid(physid) ((uint32_t)((physid) >> 32))
  209 
  210 /*
  211  * Register a memory location to get a secondary copy of the vcpu time
  212  * parameters.  The master copy still exists as part of the vcpu shared
  213  * memory area, and this secondary copy is updated whenever the master copy
  214  * is updated (and using the same versioning scheme for synchronisation).
  215  *
  216  * The intent is that this copy may be mapped (RO) into userspace so
  217  * that usermode can compute system time using the time info and the
  218  * tsc.  Usermode will see an array of vcpu_time_info structures, one
  219  * for each vcpu, and choose the right one by an existing mechanism
  220  * which allows it to get the current vcpu number (such as via a
  221  * segment limit).  It can then apply the normal algorithm to compute
  222  * system time from the tsc.
  223  *
  224  * @extra_arg == pointer to vcpu_register_time_info_memory_area structure.
  225  */
  226 #define VCPUOP_register_vcpu_time_memory_area   13
  227 DEFINE_XEN_GUEST_HANDLE(vcpu_time_info_t);
  228 struct vcpu_register_time_memory_area {
  229     union {
  230         XEN_GUEST_HANDLE(vcpu_time_info_t) h;
  231         struct vcpu_time_info *v;
  232         uint64_t p;
  233     } addr;
  234 };
  235 typedef struct vcpu_register_time_memory_area vcpu_register_time_memory_area_t;
  236 DEFINE_XEN_GUEST_HANDLE(vcpu_register_time_memory_area_t);
  237 
  238 #endif /* __XEN_PUBLIC_VCPU_H__ */
  239 
  240 /*
  241  * Local variables:
  242  * mode: C
  243  * c-file-style: "BSD"
  244  * c-basic-offset: 4
  245  * tab-width: 4
  246  * indent-tabs-mode: nil
  247  * End:
  248  */

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