/*
* Emulate a guest 'hlt' by sleeping until the vcpu is ready to run.
*/
static int
vm_handle_hlt(struct vm *vm, int vcpuid, bool intr_disabled, bool *retu)
{
struct vm_exit *vmexit;
struct vcpu *vcpu;
int t, timo, spindown;
vcpu = &vm->vcpu[vcpuid];
spindown = 0;
vcpu_lock(vcpu);
/*
* Do a final check for pending NMI or interrupts before
* really putting this thread to sleep.
*
* These interrupts could have happened any time after we
* returned from VMRUN() and before we grabbed the vcpu lock.
*/
if (!vm_nmi_pending(vm, vcpuid) &&
(intr_disabled || !vlapic_pending_intr(vcpu->vlapic, NULL))) {
t = ticks;
vcpu_require_state_locked(vcpu, VCPU_SLEEPING);
if (vlapic_enabled(vcpu->vlapic)) {
/*
* XXX msleep_spin() is not interruptible so use the
* 'timo' to put an upper bound on the sleep time.
*/
timo = hz;
msleep_spin(vcpu, &vcpu->mtx, "vmidle", timo);
} else {
/*
* Spindown the vcpu if the apic is disabled and it
* had entered the halted state.
*/
spindown = 1;
}
vcpu_require_state_locked(vcpu, VCPU_FROZEN);
vmm_stat_incr(vm, vcpuid, VCPU_IDLE_TICKS, ticks - t);
}
vcpu_unlock(vcpu);
/*
* Since 'vm_deactivate_cpu()' grabs a sleep mutex we must call it
* outside the confines of the vcpu spinlock.
*/
if (spindown) {
*retu = true;
vmexit = vm_exitinfo(vm, vcpuid);
vmexit->exitcode = VM_EXITCODE_SPINDOWN_CPU;
vm_deactivate_cpu(vm, vcpuid);
VCPU_CTR0(vm, vcpuid, "spinning down cpu");
}
return (0);
}
void
vm_exit_reqidle(struct vm *vm, int vcpuid, uint64_t rip)
{
struct vm_exit *vmexit;
vmexit = vm_exitinfo(vm, vcpuid);
vmexit->rip = rip;
vmexit->inst_length = 0;
vmexit->exitcode = VM_EXITCODE_REQIDLE;
vmm_stat_incr(vm, vcpuid, VMEXIT_REQIDLE, 1);
}
void
vm_exit_rendezvous(struct vm *vm, int vcpuid, uint64_t rip)
{
struct vm_exit *vmexit;
KASSERT(vm->rendezvous_func != NULL, ("rendezvous not in progress"));
vmexit = vm_exitinfo(vm, vcpuid);
vmexit->rip = rip;
vmexit->inst_length = 0;
vmexit->exitcode = VM_EXITCODE_RENDEZVOUS;
vmm_stat_incr(vm, vcpuid, VMEXIT_RENDEZVOUS, 1);
}
void
vm_exit_suspended(struct vm *vm, int vcpuid, uint64_t rip)
{
struct vm_exit *vmexit;
KASSERT(vm->suspend > VM_SUSPEND_NONE && vm->suspend < VM_SUSPEND_LAST,
("vm_exit_suspended: invalid suspend type %d", vm->suspend));
vmexit = vm_exitinfo(vm, vcpuid);
vmexit->rip = rip;
vmexit->inst_length = 0;
vmexit->exitcode = VM_EXITCODE_SUSPENDED;
vmexit->u.suspended.how = (enum vm_suspend_how) vm->suspend;
}
static void
vm_inject_fault(struct vm *vm, int vcpuid, struct vm_exception *exception)
{
struct vm_exit *vmexit;
int error;
error = vm_inject_exception(vm, vcpuid, exception);
KASSERT(error == 0, ("vm_inject_exception error %d", error));
/*
* A fault-like exception allows the instruction to be restarted
* after the exception handler returns.
*
* By setting the inst_length to 0 we ensure that the instruction
* pointer remains at the faulting instruction.
*/
vmexit = vm_exitinfo(vm, vcpuid);
vmexit->inst_length = 0;
}