static void vcpu_irq_wfi_try_resume(struct vmm_vcpu *vcpu, void *data)
{
/* Try to resume the VCPU */
if (data == (void *)TRUE) {
vmm_manager_vcpu_resume(vcpu);
}
}
static int cmd_vcpu_resume(vmm_chardev_t *cdev, int id)
{
int ret = VMM_EFAIL;
vmm_vcpu_t *vcpu = vmm_manager_vcpu(id);
if (vcpu) {
if ((ret = vmm_manager_vcpu_resume(vcpu))) {
vmm_cprintf(cdev, "%s: Failed to resume\n",
vcpu->name);
} else {
vmm_cprintf(cdev, "%s: Resumed\n", vcpu->name);
}
} else {
vmm_cprintf(cdev, "Failed to find vcpu\n");
}
return ret;
}
static int vcpu_irq_wfi_resume(struct vmm_vcpu *vcpu, bool use_async_ipi)
{
int rc;
irq_flags_t flags;
bool try_vcpu_resume = FALSE;
if (!vcpu) {
return VMM_EINVALID;
}
/* Lock VCPU WFI */
vmm_spin_lock_irqsave_lite(&vcpu->irqs.wfi.lock, flags);
/* If VCPU was in wfi state then update state. */
if (vcpu->irqs.wfi.state) {
try_vcpu_resume = TRUE;
/* Clear wait for irq state */
vcpu->irqs.wfi.state = FALSE;
/* Stop wait for irq timeout event */
vmm_timer_event_stop(vcpu->irqs.wfi.priv);
rc = VMM_OK;
} else {
rc = VMM_ENOTAVAIL;
}
/* Unlock VCPU WFI */
vmm_spin_unlock_irqrestore_lite(&vcpu->irqs.wfi.lock, flags);
/* Try to resume the VCPU */
if (use_async_ipi) {
/* The vcpu_irq_wfi_try_resume() will be executed by async
* IPI worker on hcpu assigned to vcpu (i.e. vcpu->hcpu).
* Case 1: try_vcpu_resume == TRUE
* The vcpu_irq_wfi_try_resume() will try to resume vcpu
* using vmm_manager_vcpu_resume(). This can fail if vcpu
* is already in READY or RUNNING state.
* Case 2: try_resume == FALSE
* The vcpu_irq_wfi_try_resume() will do nothing but
* if vcpu was in RUNNING state then it will force atleast
* one context switch for vcpu. This will help hardware
* assisted interrupt-controller emulators to flush out
* pending interrupts when vcpu is restored.
*/
vmm_manager_vcpu_hcpu_func(vcpu,
VMM_VCPU_STATE_INTERRUPTIBLE,
vcpu_irq_wfi_try_resume,
(try_vcpu_resume) ? (void *)TRUE : (void *)FALSE);
} else {
/* Case 1: try_vcpu_resume == TRUE
* We directly resume vcpu using vmm_manager_vcpu_resume().
* This can fail if vcpu is in READY or RUNNING state.
* Case 2: try_vcpu_resume == FALSE
* We do nothing.
*/
if (try_vcpu_resume) {
vmm_manager_vcpu_resume(vcpu);
}
}
return rc;
}