struct guest_info;
-struct vm_time {
+/* Per-VM time information */
+struct v3_time {
+ uint32_t td_mult;
+};
+
+/* Per-core time information */
+struct vm_core_time {
uint32_t host_cpu_freq; // in kHZ
uint32_t guest_cpu_freq; // can be lower than host CPU freq!
- sint64_t guest_host_offset;// Offset of monotonic guest time from host time
- sint64_t tsc_guest_offset; // Offset of guest TSC from monotonic guest time
+ uint64_t guest_cycles;
+ sint64_t tsc_guest_offset; // Offset of guest TSC from guest cycles
- uint64_t last_update; // Last time (in monotonic guest time) the
+ uint64_t last_update; // Last time (in guest cycles) the
// timers were updated
- uint64_t initial_time; // Time when VMM started.
+ uint64_t initial_time; // Host time when VMM started.
uint64_t enter_time; // Host time the guest was last entered
uint64_t exit_time; // Host time the the VM was exited to
struct v3_msr tsc_aux; // Auxilliary MSR for RDTSCP
// Installed Timers slaved off of the guest monotonic TSC
uint_t num_timers;
struct list_head timers;
+
};
struct v3_timer_ops {
void * private_data;
struct v3_timer_ops * ops;
+ // Need to add accuracy/resolution fields later.
+
struct list_head timer_link;
};
+
+
// Basic functions for handling passage of time in palacios
void v3_init_time_core(struct guest_info * core);
int v3_init_time_vm(struct v3_vm_info * vm);
int v3_start_time(struct guest_info * core);
int v3_time_enter_vm(struct guest_info * core);
-int v3_time_exit_vm(struct guest_info * core);
+int v3_time_exit_vm(struct guest_info * core, uint64_t * guest_cycles);
-int v3_adjust_time(struct guest_info * core);
+int v3_pause_time(struct guest_info * core);
+int v3_resume_time(struct guest_info * core);
int v3_offset_time(struct guest_info * core, sint64_t offset);
-// Basic functions for attaching timers to the passage of time
+int v3_adjust_time(struct guest_info * core);
+
+// Basic functions for attaching timers to the passage of time - these timers
+// should eventually specify their accuracy and resolution.
struct v3_timer * v3_add_timer(struct guest_info * info, struct v3_timer_ops * ops, void * private_data);
int v3_remove_timer(struct guest_info * info, struct v3_timer * timer);
void v3_update_timers(struct guest_info * info);
// Functions to return the different notions of time in Palacios.
-static inline uint64_t v3_get_host_time(struct vm_time *t) {
+static inline uint64_t v3_get_host_time(struct vm_core_time *t) {
uint64_t tmp;
rdtscll(tmp);
return tmp;
}
// Returns *monotonic* guest time.
-static inline uint64_t v3_compute_guest_time(struct vm_time *t, uint64_t ht) {
-#ifdef V3_CONFIG_TIME_HIDE_VM_COST
- V3_ASSERT(t->exit_time);
- return t->exit_time + t->guest_host_offset;
-#else
- return v3_get_host_time(t) + t->guest_host_offset;
-#endif
-}
-
-static inline uint64_t v3_get_guest_time(struct vm_time *t) {
- return v3_compute_guest_time(t, v3_get_host_time(t));
-}
-
-// Returns the TSC value seen by the guest
-static inline uint64_t v3_compute_guest_tsc(struct vm_time *t, uint64_t ht) {
- return v3_compute_guest_time(t, ht) + t->tsc_guest_offset;
+static inline uint64_t v3_get_guest_time(struct vm_core_time *t) {
+ return t->guest_cycles;
}
-static inline uint64_t v3_get_guest_tsc(struct vm_time *t) {
- return v3_compute_guest_tsc(t, v3_get_host_time(t));
+static inline uint64_t v3_get_guest_tsc(struct vm_core_time *t) {
+ return v3_get_guest_time(t) + t->tsc_guest_offset;
}
// Returns offset of guest TSC from host TSC
-static inline sint64_t v3_tsc_host_offset(struct vm_time *time_state) {
- return time_state->guest_host_offset + time_state->tsc_guest_offset;
+static inline sint64_t v3_tsc_host_offset(struct vm_core_time *time_state) {
+ uint64_t host_time = v3_get_host_time(time_state);
+ return ((sint64_t)host_time - (sint64_t)time_state->guest_cycles) + time_state->tsc_guest_offset;
}
// Functions for handling exits on the TSC when fully virtualizing
