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 /* 31 * Prototype for this hypercall is: 32 * int vcpu_op(int cmd, int vcpuid, void *extra_args) 33 * @cmd == VCPUOP_??? (VCPU operation). 34 * @vcpuid == VCPU to operate on. 35 * @extra_args == Operation-specific extra arguments (NULL if none). 36 */ 37 38 /* 39 * Initialise a VCPU. Each VCPU can be initialised only once. A 40 * newly-initialised VCPU will not run until it is brought up by VCPUOP_up. 41 * 42 * @extra_arg == pointer to vcpu_guest_context structure containing initial 43 * state for the VCPU. 44 */ 45 #define VCPUOP_initialise 0 46 47 /* 48 * Bring up a VCPU. This makes the VCPU runnable. This operation will fail 49 * if the VCPU has not been initialised (VCPUOP_initialise). 50 */ 51 #define VCPUOP_up 1 52 53 /* 54 * Bring down a VCPU (i.e., make it non-runnable). 55 * There are a few caveats that callers should observe: 56 * 1. This operation may return, and VCPU_is_up may return false, before the 57 * VCPU stops running (i.e., the command is asynchronous). It is a good 58 * idea to ensure that the VCPU has entered a non-critical loop before 59 * bringing it down. Alternatively, this operation is guaranteed 60 * synchronous if invoked by the VCPU itself. 61 * 2. After a VCPU is initialised, there is currently no way to drop all its 62 * references to domain memory. Even a VCPU that is down still holds 63 * memory references via its pagetable base pointer and GDT. It is good 64 * practise to move a VCPU onto an 'idle' or default page table, LDT and 65 * GDT before bringing it down. 66 */ 67 #define VCPUOP_down 2 68 69 /* Returns 1 if the given VCPU is up. */ 70 #define VCPUOP_is_up 3 71 72 /* 73 * Return information about the state and running time of a VCPU. 74 * @extra_arg == pointer to vcpu_runstate_info structure. 75 */ 76 #define VCPUOP_get_runstate_info 4 77 struct vcpu_runstate_info { 78 /* VCPU's current state (RUNSTATE_*). */ 79 int state; 80 /* When was current state entered (system time, ns)? */ 81 uint64_t state_entry_time; 82 /* 83 * Time spent in each RUNSTATE_* (ns). The sum of these times is 84 * guaranteed not to drift from system time. 85 */ 86 uint64_t time[4]; 87 }; 88 DEFINE_GUEST_HANDLE_STRUCT(vcpu_runstate_info); 89 90 /* VCPU is currently running on a physical CPU. */ 91 #define RUNSTATE_running 0 92 93 /* VCPU is runnable, but not currently scheduled on any physical CPU. */ 94 #define RUNSTATE_runnable 1 95 96 /* VCPU is blocked (a.k.a. idle). It is therefore not runnable. */ 97 #define RUNSTATE_blocked 2 98 99 /* 100 * VCPU is not runnable, but it is not blocked. 101 * This is a 'catch all' state for things like hotplug and pauses by the 102 * system administrator (or for critical sections in the hypervisor). 103 * RUNSTATE_blocked dominates this state (it is the preferred state). 104 */ 105 #define RUNSTATE_offline 3 106 107 /* 108 * Register a shared memory area from which the guest may obtain its own 109 * runstate information without needing to execute a hypercall. 110 * Notes: 111 * 1. The registered address may be virtual or physical, depending on the 112 * platform. The virtual address should be registered on x86 systems. 113 * 2. Only one shared area may be registered per VCPU. The shared area is 114 * updated by the hypervisor each time the VCPU is scheduled. Thus 115 * runstate.state will always be RUNSTATE_running and 116 * runstate.state_entry_time will indicate the system time at which the 117 * VCPU was last scheduled to run. 118 * @extra_arg == pointer to vcpu_register_runstate_memory_area structure. 119 */ 120 #define VCPUOP_register_runstate_memory_area 5 121 struct vcpu_register_runstate_memory_area { 122 union { 123 GUEST_HANDLE(vcpu_runstate_info) h; 124 struct vcpu_runstate_info *v; 125 uint64_t p; 126 } addr; 127 }; 128 129 /* 130 * Set or stop a VCPU's periodic timer. Every VCPU has one periodic timer 131 * which can be set via these commands. Periods smaller than one millisecond 132 * may not be supported. 133 */ 134 #define VCPUOP_set_periodic_timer 6 /* arg == vcpu_set_periodic_timer_t */ 135 #define VCPUOP_stop_periodic_timer 7 /* arg == NULL */ 136 struct vcpu_set_periodic_timer { 137 uint64_t period_ns; 138 }; 139 DEFINE_GUEST_HANDLE_STRUCT(vcpu_set_periodic_timer); 140 141 /* 142 * Set or stop a VCPU's single-shot timer. Every VCPU has one single-shot 143 * timer which can be set via these commands. 144 */ 145 #define VCPUOP_set_singleshot_timer 8 /* arg == vcpu_set_singleshot_timer_t */ 146 #define VCPUOP_stop_singleshot_timer 9 /* arg == NULL */ 147 struct vcpu_set_singleshot_timer { 148 uint64_t timeout_abs_ns; 149 uint32_t flags; /* VCPU_SSHOTTMR_??? */ 150 }; 151 DEFINE_GUEST_HANDLE_STRUCT(vcpu_set_singleshot_timer); 152 153 /* Flags to VCPUOP_set_singleshot_timer. */ 154 /* Require the timeout to be in the future (return -ETIME if it's passed). */ 155 #define _VCPU_SSHOTTMR_future (0) 156 #define VCPU_SSHOTTMR_future (1U << _VCPU_SSHOTTMR_future) 157 158 /* 159 * Register a memory location in the guest address space for the 160 * vcpu_info structure. This allows the guest to place the vcpu_info 161 * structure in a convenient place, such as in a per-cpu data area. 162 * The pointer need not be page aligned, but the structure must not 163 * cross a page boundary. 164 */ 165 #define VCPUOP_register_vcpu_info 10 /* arg == struct vcpu_info */ 166 struct vcpu_register_vcpu_info { 167 uint64_t mfn; /* mfn of page to place vcpu_info */ 168 uint32_t offset; /* offset within page */ 169 uint32_t rsvd; /* unused */ 170 }; 171 DEFINE_GUEST_HANDLE_STRUCT(vcpu_register_vcpu_info); 172 173 #endif /* __XEN_PUBLIC_VCPU_H__ */ 174