Timed yielding in vmm_halt to avoid pegging CPU

[palacios.git] / palacios / src / palacios / svm.c

diff --git a/palacios/src/palacios/svm.c b/palacios/src/palacios/svm.c
index b4f692c..c98a48b 100644 (file)
--- a/palacios/src/palacios/svm.c
+++ b/palacios/src/palacios/svm.c
@@ -36,6 +36,7 @@
 
 #include <palacios/vmm_rbtree.h>
 #include <palacios/vmm_barrier.h>
+#include <palacios/vmm_debug.h>
 
 #ifdef V3_CONFIG_CHECKPOINT
 #include <palacios/vmm_checkpoint.h>
@@ -368,15 +369,25 @@ int v3_deinit_svm_vmcb(struct guest_info * core) {
 #ifdef V3_CONFIG_CHECKPOINT
 int v3_svm_save_core(struct guest_info * core, void * ctx){
 
-    v3_chkpt_save_8(ctx, "cpl", &(core->cpl));
-    v3_chkpt_save(ctx, "vmcb_data", PAGE_SIZE, core->vmm_data);
+    if (v3_chkpt_save_8(ctx, "cpl", &(core->cpl)) == -1) { 
+       PrintError("Could not save SVM cpl\n");
+       return -1;
+    }
+
+    if (v3_chkpt_save(ctx, "vmcb_data", PAGE_SIZE, core->vmm_data) == -1) { 
+       PrintError("Could not save SVM vmcb\n");
+       return -1;
+    }
 
     return 0;
 }
 
 int v3_svm_load_core(struct guest_info * core, void * ctx){
     
-    v3_chkpt_load_8(ctx, "cpl", &(core->cpl));
+    if (v3_chkpt_load_8(ctx, "cpl", &(core->cpl)) == -1) { 
+       PrintError("Could not load SVM cpl\n");
+       return -1;
+    }
 
     if (v3_chkpt_load(ctx, "vmcb_data", PAGE_SIZE, core->vmm_data) == -1) {
        return -1;
@@ -523,13 +534,17 @@ int
 v3_svm_config_tsc_virtualization(struct guest_info * info) {
     vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA((vmcb_t*)(info->vmm_data));
 
-    if (info->time_state.time_flags & V3_TIME_TRAP_RDTSC) {
+    if (info->time_state.flags & VM_TIME_TRAP_RDTSC) {
        ctrl_area->instrs.RDTSC = 1;
        ctrl_area->svm_instrs.RDTSCP = 1;
     } else {
        ctrl_area->instrs.RDTSC = 0;
        ctrl_area->svm_instrs.RDTSCP = 0;
-        ctrl_area->TSC_OFFSET = v3_tsc_host_offset(&info->time_state);
+       if (info->time_state.flags & VM_TIME_TSC_PASSTHROUGH) {
+               ctrl_area->TSC_OFFSET = 0;
+       } else {
+               ctrl_area->TSC_OFFSET = v3_tsc_host_offset(&info->time_state);
+       }
     }
     return 0;
 }
@@ -551,15 +566,15 @@ int v3_svm_enter(struct guest_info * info) {
     // Conditionally yield the CPU if the timeslice has expired
     v3_yield_cond(info);
 
+    // Update timer devices after being in the VM before doing 
+    // IRQ updates, so that any interrupts they raise get seen 
+    // immediately.
+    v3_advance_time(info, NULL);
+    v3_update_timers(info);
+
     // disable global interrupts for vm state transition
     v3_clgi();
 
-    // Update timer devices after being in the VM, with interupts
-    // disabled, but before doing IRQ updates, so that any interrupts they 
-    //raise get seen immediately.
-    v3_advance_time(info);
-    v3_update_timers(info);
-
     // Synchronize the guest state to the VMCB
     guest_state->cr0 = info->ctrl_regs.cr0;
     guest_state->cr2 = info->ctrl_regs.cr2;
@@ -610,7 +625,6 @@ int v3_svm_enter(struct guest_info * info) {
     }
 #endif
 
-    v3_time_enter_vm(info);
     v3_svm_config_tsc_virtualization(info);
 
     //V3_Print("Calling v3_svm_launch\n");
@@ -632,8 +646,7 @@ int v3_svm_enter(struct guest_info * info) {
 
     v3_last_exit = (uint32_t)(guest_ctrl->exit_code);
 
-    // Immediate exit from VM time bookkeeping
-    v3_time_exit_vm(info, &guest_cycles);
+    v3_advance_time(info, &guest_cycles);
 
     info->num_exits++;
 
@@ -684,6 +697,11 @@ int v3_svm_enter(struct guest_info * info) {
     // Conditionally yield the CPU if the timeslice has expired
     v3_yield_cond(info);
 
+    // This update timers is for time-dependent handlers
+    // if we're slaved to host time
+    v3_advance_time(info, NULL);
+    v3_update_timers(info);
+
     {
        int ret = v3_handle_svm_exit(info, exit_code, exit_info1, exit_info2);