2 * This file is part of the Palacios Virtual Machine Monitor developed
3 * by the V3VEE Project with funding from the United States National
4 * Science Foundation and the Department of Energy.
6 * The V3VEE Project is a joint project between Northwestern University
7 * and the University of New Mexico. You can find out more at
10 * Copyright (c) 2010, Patrick Bridges <bridges@cs.unm.edu>
11 * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
12 * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
13 * All rights reserved.
15 * Author: Jack Lange <jarusl@cs.northwestern.edu>
16 * Patrick Bridges <bridges@cs.unm.edu>
18 * This is free software. You are permitted to use,
19 * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
27 #include <palacios/vmm_types.h>
28 #include <palacios/vmm_list.h>
29 #include <palacios/vmm_msr.h>
30 #include <palacios/vmm_util.h>
34 /* Per-VM time information */
36 uint32_t td_num, td_denom; /* Currently unused! */
37 char follow_host_time;
40 /* Per-core time information */
42 uint32_t host_cpu_freq; // in kHZ
43 uint32_t guest_cpu_freq; // can be lower than host CPU freq!
45 uint32_t clock_ratio_num; // Multipliers for converting from host
46 uint32_t clock_ratio_denom;// cycles to guest cycles.
48 uint64_t guest_cycles;
49 sint64_t tsc_guest_offset; // Offset of guest TSC from guest cycles
51 uint64_t last_update; // Last time (in guest cycles) the
52 // timers were updated
54 uint64_t initial_host_time;// Host time when VMM started.
55 uint64_t vm_enter_host_time; // Host time the guest was last entered
56 uint64_t vm_pause_host_time; // Host time when we went into the VMM
57 struct v3_msr tsc_aux; // Auxilliary MSR for RDTSCP
59 // Installed Timers slaved off of the guest monotonic TSC
61 struct list_head timers;
66 void (*update_timer)(struct guest_info * info, ullong_t cpu_cycles, ullong_t cpu_freq, void * priv_data);
67 void (*advance_timer)(struct guest_info * info, void * private_data);
72 struct v3_timer_ops * ops;
74 // Need to add accuracy/resolution fields later.
76 struct list_head timer_link;
81 // Basic functions for handling passage of time in palacios
82 void v3_init_time_core(struct guest_info * core);
83 int v3_init_time_vm(struct v3_vm_info * vm);
85 void v3_deinit_time_core(struct guest_info * core);
86 void v3_deinit_time_vm(struct v3_vm_info * vm);
88 int v3_start_time(struct guest_info * core);
90 int v3_time_enter_vm(struct guest_info * core);
91 int v3_time_exit_vm(struct guest_info * core, uint64_t * guest_cycles);
93 int v3_offset_time(struct guest_info * core, sint64_t offset);
94 int v3_skip_time(struct guest_info * core);
95 int v3_advance_time(struct guest_info * core);
97 // Basic functions for attaching timers to the passage of time - these timers
98 // should eventually specify their accuracy and resolution.
99 struct v3_timer * v3_add_timer(struct guest_info * info, struct v3_timer_ops * ops, void * private_data);
100 int v3_remove_timer(struct guest_info * info, struct v3_timer * timer);
101 void v3_update_timers(struct guest_info * info);
103 // Functions to return the different notions of time in Palacios.
104 static inline uint64_t v3_get_host_time(struct vm_core_time *t) {
110 // Returns *monotonic* guest time.
111 static inline uint64_t v3_get_guest_time(struct vm_core_time *t) {
112 return t->guest_cycles;
115 static inline uint64_t v3_get_guest_tsc(struct vm_core_time *t) {
116 return v3_get_guest_time(t) + t->tsc_guest_offset;
119 // Returns offset of guest TSC from host TSC
120 static inline sint64_t v3_tsc_host_offset(struct vm_core_time *time_state) {
121 uint64_t host_time = v3_get_host_time(time_state);
122 return ((sint64_t)host_time - (sint64_t)time_state->guest_cycles) + time_state->tsc_guest_offset;
125 // Functions for handling exits on the TSC when fully virtualizing
126 // the timestamp counter.
128 #define TSC_AUX_MSR 0xC0000103
130 int v3_handle_rdtscp(struct guest_info *info);
131 int v3_handle_rdtsc(struct guest_info *info);