#include <palacios/vmx_msr.h>
#include <palacios/vmm_decoder.h>
#include <palacios/vmm_barrier.h>
+#include <palacios/vmm_timeout.h>
#ifdef V3_CONFIG_CHECKPOINT
#include <palacios/vmm_checkpoint.h>
static int init_vmcs_bios(struct guest_info * core, struct vmx_data * vmx_state) {
int vmx_ret = 0;
+ /* Get Available features */
+ struct vmx_pin_ctrls avail_pin_ctrls;
+ avail_pin_ctrls.value = v3_vmx_get_ctrl_features(&(hw_info.pin_ctrls));
+ /* ** */
+
+
// disable global interrupts for vm state initialization
v3_disable_ints();
vmx_state->pin_ctrls.ext_int_exit = 1;
+ /* We enable the preemption timer by default to measure accurate guest time */
+ if (avail_pin_ctrls.active_preempt_timer) {
+ V3_Print("VMX Preemption Timer is available\n");
+ vmx_state->pin_ctrls.active_preempt_timer = 1;
+ vmx_state->exit_ctrls.save_preempt_timer = 1;
+ }
+
vmx_state->pri_proc_ctrls.hlt_exit = 1;
vmx_state->entry_ctrls.ld_pat = 1;
/* Temporary GPF trap */
- vmx_state->excp_bmap.gp = 1;
+ // vmx_state->excp_bmap.gp = 1;
// Setup Guests initial PAT field
vmx_ret |= check_vmcs_write(VMCS_GUEST_PAT, 0x0007040600070406LL);
}
-int
-v3_vmx_schedule_timeout(struct guest_info * info)
-{
- struct vmx_data * vmx_state = (struct vmx_data *)(info->vmm_data);
- sint64_t cycles;
- uint32_t timeout;
-
- /* Check if the hardware supports an active timeout */
-#define VMX_ACTIVE_PREEMPT_TIMER_PIN 0x40
- if (hw_info.pin_ctrls.req_mask & VMX_ACTIVE_PREEMPT_TIMER_PIN) {
- /* The hardware doesn't support us modifying this pin control */
- return 0;
- }
- /* Check if we have one to schedule and schedule it if we do */
- cycles = (sint64_t)info->time_state.next_timeout - (sint64_t)v3_get_guest_time(&info->time_state);
- if (info->time_state.next_timeout == (ullong_t) -1) {
- timeout = 0;
- vmx_state->pin_ctrls.active_preempt_timer = 0;
- } else if (cycles < 0) {
- /* set the timeout to 0 to force an immediate re-exit since it expired between
- * when we checked a timeout and now. IF SOMEONE CONTINAULLY SETS A SHORT TIMEOUT,
- * THIS CAN LOCK US OUT OF THE GUEST! */
- timeout = 0;
- vmx_state->pin_ctrls.active_preempt_timer = 1;
- } else {
- /* The hardware supports scheduling a timeout, and we have one to
- * schedule */
- timeout = (uint32_t)cycles >> hw_info.misc_info.tsc_multiple;
- vmx_state->pin_ctrls.active_preempt_timer = 1;
- }
-
- /* Actually program the timer based on the settings above. */
- check_vmcs_write(VMCS_PREEMPT_TIMER, timeout);
- check_vmcs_write(VMCS_PIN_CTRLS, vmx_state->pin_ctrls.value);
- return 0;
-}
/*
* CAUTION and DANGER!!!
uint32_t tsc_offset_low, tsc_offset_high;
struct vmx_exit_info exit_info;
struct vmx_data * vmx_info = (struct vmx_data *)(info->vmm_data);
+ uint64_t guest_cycles = 0;
// Conditionally yield the CPU if the timeslice has expired
v3_yield_cond(info);
// Perform any additional yielding needed for time adjustment
v3_adjust_time(info);
- // Check for timeout - since this calls generic hooks in devices
- // that may do things like pause the VM, it cannot be with interrupts
- // disabled.
- v3_check_timeout(info);
-
// disable global interrupts for vm state transition
v3_disable_ints();
vmcs_write(VMCS_GUEST_CR3, guest_cr3);
}
- // Update vmx active preemption timer to exit at the next timeout if
- // the hardware supports it.
- v3_vmx_schedule_timeout(info);
// Perform last-minute time bookkeeping prior to entering the VM
v3_time_enter_vm(info);
check_vmcs_write(VMCS_TSC_OFFSET_HIGH, tsc_offset_high);
check_vmcs_write(VMCS_TSC_OFFSET, tsc_offset_low);
+
+
if (v3_update_vmcs_host_state(info)) {
v3_enable_ints();
PrintError("Could not write host state\n");
return -1;
}
+
+ if (vmx_info->pin_ctrls.active_preempt_timer) {
+ /* Preemption timer is active */
+ uint32_t preempt_window = 0xffffffff;
-
- if (vmx_info->state == VMX_UNLAUNCHED) {
- vmx_info->state = VMX_LAUNCHED;
- ret = v3_vmx_launch(&(info->vm_regs), info, &(info->ctrl_regs));
- } else {
- V3_ASSERT(vmx_info->state != VMX_UNLAUNCHED);
- ret = v3_vmx_resume(&(info->vm_regs), info, &(info->ctrl_regs));
+ if (info->timeouts.timeout_active) {
+ preempt_window = info->timeouts.next_timeout;
+ }
+
+ check_vmcs_write(VMCS_PREEMPT_TIMER, preempt_window);
}
-
+
+
+ {
+ uint64_t entry_tsc = 0;
+ uint64_t exit_tsc = 0;
+
+ if (vmx_info->state == VMX_UNLAUNCHED) {
+ vmx_info->state = VMX_LAUNCHED;
+ rdtscll(entry_tsc);
+ ret = v3_vmx_launch(&(info->vm_regs), info, &(info->ctrl_regs));
+ rdtscll(exit_tsc);
+ } else {
+ V3_ASSERT(vmx_info->state != VMX_UNLAUNCHED);
+ rdtscll(entry_tsc);
+ ret = v3_vmx_resume(&(info->vm_regs), info, &(info->ctrl_regs));
+ rdtscll(exit_tsc);
+ }
+
+ guest_cycles = exit_tsc - entry_tsc;
+ }
// PrintDebug("VMX Exit: ret=%d\n", ret);
}
+ info->num_exits++;
+
+ /* If we have the preemption time, then use it to get more accurate guest time */
+ if (vmx_info->pin_ctrls.active_preempt_timer) {
+ uint32_t cycles_left = 0;
+ check_vmcs_read(VMCS_PREEMPT_TIMER, &(cycles_left));
+
+ if (info->timeouts.timeout_active) {
+ guest_cycles = info->timeouts.next_timeout - cycles_left;
+ } else {
+ guest_cycles = 0xffffffff - cycles_left;
+ }
+ }
// Immediate exit from VM time bookkeeping
- v3_time_exit_vm(info);
+ v3_time_exit_vm(info, &guest_cycles);
- info->num_exits++;
/* Update guest state */
v3_vmx_save_vmcs(info);
info->cpu_mode = v3_get_vm_cpu_mode(info);
+
check_vmcs_read(VMCS_EXIT_INSTR_LEN, &(exit_info.instr_len));
check_vmcs_read(VMCS_EXIT_INSTR_INFO, &(exit_info.instr_info));
check_vmcs_read(VMCS_EXIT_REASON, &(exit_info.exit_reason));
return -1;
}
+ if (info->timeouts.timeout_active) {
+ /* Check to see if any timeouts have expired */
+ v3_handle_timeouts(info, guest_cycles);
+ }
+
return 0;
}
