* All rights reserved.
*
* Author: Jack Lange <jarusl@cs.northwestern.edu>
+ * Patrick G. Bridges <bridges@cs.unm.edu>
*
* This is free software. You are permitted to use,
* redistribute, and modify it as specified in the file "V3VEE_LICENSE".
#include <palacios/vmm.h>
#include <palacios/vm_guest.h>
+#ifndef CONFIG_DEBUG_TIME
+#undef PrintDebug
+#define PrintDebug(fmt, args...)
+#endif
+
+static int handle_cpufreq_hcall(struct guest_info * info, uint_t hcall_id, void * priv_data) {
+ struct vm_time * time_state = &(info->time_state);
+
+ info->vm_regs.rbx = time_state->cpu_freq;
+
+ PrintDebug("Guest request cpu frequency: return %ld\n", (long)info->vm_regs.rbx);
+
+ return 0;
+}
+
+
+
void v3_init_time(struct guest_info * info) {
struct vm_time * time_state = &(info->time_state);
time_state->cpu_freq = V3_CPU_KHZ();
- time_state->guest_tsc = 0;
- time_state->cached_host_tsc = 0;
- // time_state->pending_cycles = 0;
-
+ time_state->pause_time = 0;
+ time_state->last_update = 0;
+ time_state->host_offset = 0;
+
INIT_LIST_HEAD(&(time_state->timers));
time_state->num_timers = 0;
+
+ v3_register_hypercall(info->vm_info, TIME_CPUFREQ_HCALL, handle_cpufreq_hcall, NULL);
+}
+
+int v3_start_time(struct guest_info * info) {
+ /* We start running with guest_time == host_time */
+ uint64_t t = v3_get_host_time(&info->time_state);
+
+ PrintDebug("Starting initial guest time as %llu\n", t);
+ info->time_state.last_update = t;
+ info->time_state.pause_time = t;
+ return 0;
+}
+
+int v3_pause_time(struct guest_info * info) {
+ V3_ASSERT(info->time_state.pause_time == 0);
+ info->time_state.pause_time = v3_get_guest_time(&info->time_state);
+ PrintDebug("Time paused at guest time as %llu\n",
+ info->time_state.pause_time);
+ return 0;
}
+int v3_resume_time(struct guest_info * info) {
+ uint64_t t = v3_get_host_time(&info->time_state);
+ V3_ASSERT(info->time_state.pause_time != 0);
+ info->time_state.host_offset =
+ (sint64_t)info->time_state.pause_time - (sint64_t)t;
+#ifdef CONFIG_TIME_TSC_OFFSET_ADJUST
+ /* XXX Adjust host_offset towards zero based on resolution/accuracy
+ * constraints. */
+#endif
+ info->time_state.pause_time = 0;
+ PrintDebug("Time resumed paused at guest time as %llu "
+ "offset %lld from host time.\n", t, info->time_state.host_offset);
-int v3_add_timer(struct guest_info * info, struct vm_timer_ops * ops, void * private_data) {
+ return 0;
+}
+
+int v3_add_timer(struct guest_info * info, struct vm_timer_ops * ops,
+ void * private_data) {
struct vm_timer * timer = NULL;
timer = (struct vm_timer *)V3_Malloc(sizeof(struct vm_timer));
V3_ASSERT(timer != NULL);
return 0;
}
-
-
-void v3_update_time(struct guest_info * info, uint64_t cycles) {
+void v3_update_timers(struct guest_info * info) {
struct vm_timer * tmp_timer;
-
- // cycles *= 8;
+ uint64_t old_time = info->time_state.last_update;
+ uint64_t cycles;
-// cycles /= 150;
-
- info->time_state.guest_tsc += cycles;
+ info->time_state.last_update = v3_get_guest_time(&info->time_state);
+ cycles = info->time_state.last_update - old_time;
list_for_each_entry(tmp_timer, &(info->time_state.timers), timer_link) {
- tmp_timer->ops->update_time(info, cycles, info->time_state.cpu_freq, tmp_timer->private_data);
- }
-
-
-
- //info->time_state.pending_cycles = 0;
-}
-
-void v3_advance_time(struct guest_info * core) {
- struct vm_timer * tmp_timer;
-
-
- list_for_each_entry(tmp_timer, &(core->time_state.timers), timer_link) {
- tmp_timer->ops->advance_timer(core, tmp_timer->private_data);
+ tmp_timer->ops->update_timer(info, cycles, info->time_state.cpu_freq, tmp_timer->private_data);
}
-
-
-
}