/*
* 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_extint_clear(struct vm *vm, int vcpuid)
{
struct vcpu *vcpu;
if (vcpuid < 0 || vcpuid >= VM_MAXCPU)
xhyve_abort("vm_extint_pending: invalid vcpuid %d\n", vcpuid);
vcpu = &vm->vcpu[vcpuid];
if (vcpu->extint_pending == 0)
xhyve_abort("vm_extint_clear: inconsistent extint_pending state\n");
vcpu->extint_pending = 0;
vmm_stat_incr(vm, vcpuid, VCPU_EXTINT_COUNT, 1);
}
void
vm_inject_gp(struct vm *vm, int vcpuid)
{
struct vm_exception gpf = {
.vector = IDT_GP,
.error_code_valid = 1,
.error_code = 0
};
vm_inject_fault(vm, vcpuid, &gpf);
}
void
vm_inject_ud(struct vm *vm, int vcpuid)
{
struct vm_exception udf = {
.vector = IDT_UD,
.error_code_valid = 0
};
vm_inject_fault(vm, vcpuid, &udf);
}
static VMM_STAT(VCPU_NMI_COUNT, "number of NMIs delivered to vcpu");
int
vm_inject_nmi(struct vm *vm, int vcpuid)
{
struct vcpu *vcpu;
if (vcpuid < 0 || vcpuid >= VM_MAXCPU)
return (EINVAL);
vcpu = &vm->vcpu[vcpuid];
vcpu->nmi_pending = 1;
vcpu_notify_event(vm, vcpuid, false);
return (0);
}
int
vm_nmi_pending(struct vm *vm, int vcpuid)
{
struct vcpu *vcpu;
if (vcpuid < 0 || vcpuid >= VM_MAXCPU)
panic("vm_nmi_pending: invalid vcpuid %d", vcpuid);
vcpu = &vm->vcpu[vcpuid];
return (vcpu->nmi_pending);
}
void
vm_nmi_clear(struct vm *vm, int vcpuid)
{
struct vcpu *vcpu;
if (vcpuid < 0 || vcpuid >= VM_MAXCPU)
panic("vm_nmi_pending: invalid vcpuid %d", vcpuid);
vcpu = &vm->vcpu[vcpuid];
if (vcpu->nmi_pending == 0)
panic("vm_nmi_clear: inconsistent nmi_pending state");
vcpu->nmi_pending = 0;
vmm_stat_incr(vm, vcpuid, VCPU_NMI_COUNT, 1);
}
static VMM_STAT(VCPU_EXTINT_COUNT, "number of ExtINTs delivered to vcpu");
int
vm_inject_extint(struct vm *vm, int vcpuid)
{
struct vcpu *vcpu;
if (vcpuid < 0 || vcpuid >= VM_MAXCPU)
return (EINVAL);
vcpu = &vm->vcpu[vcpuid];
vcpu->extint_pending = 1;
vcpu_notify_event(vm, vcpuid, false);
return (0);
}
int
vm_extint_pending(struct vm *vm, int vcpuid)
{
struct vcpu *vcpu;
if (vcpuid < 0 || vcpuid >= VM_MAXCPU)
panic("vm_extint_pending: invalid vcpuid %d", vcpuid);
vcpu = &vm->vcpu[vcpuid];
return (vcpu->extint_pending);
}
void
vm_extint_clear(struct vm *vm, int vcpuid)
{
struct vcpu *vcpu;
if (vcpuid < 0 || vcpuid >= VM_MAXCPU)
panic("vm_extint_pending: invalid vcpuid %d", vcpuid);
vcpu = &vm->vcpu[vcpuid];
if (vcpu->extint_pending == 0)
panic("vm_extint_clear: inconsistent extint_pending state");
vcpu->extint_pending = 0;
vmm_stat_incr(vm, vcpuid, VCPU_EXTINT_COUNT, 1);
}
int
vm_get_capability(struct vm *vm, int vcpu, int type, int *retval)
{
if (vcpu < 0 || vcpu >= VM_MAXCPU)
return (EINVAL);
if (type < 0 || type >= VM_CAP_MAX)
return (EINVAL);
return (VMGETCAP(vm->cookie, vcpu, type, retval));
}
int
vm_set_capability(struct vm *vm, int vcpu, int type, int val)
{
if (vcpu < 0 || vcpu >= VM_MAXCPU)
return (EINVAL);
if (type < 0 || type >= VM_CAP_MAX)
return (EINVAL);
return (VMSETCAP(vm->cookie, vcpu, type, val));
}
uint64_t *
vm_guest_msrs(struct vm *vm, int cpu)
{
return (vm->vcpu[cpu].guest_msrs);
}
struct vlapic *
vm_lapic(struct vm *vm, int cpu)
{
return (vm->vcpu[cpu].vlapic);
}
struct vioapic *
vm_ioapic(struct vm *vm)
{
return (vm->vioapic);
}
struct vhpet *
vm_hpet(struct vm *vm)
{
return (vm->vhpet);
}
boolean_t
vmm_is_pptdev(int bus, int slot, int func)
{
int found, i, n;
int b, s, f;
char *val, *cp, *cp2;
/*
* XXX
* The length of an environment variable is limited to 128 bytes which
* puts an upper limit on the number of passthru devices that may be
* specified using a single environment variable.
*
* Work around this by scanning multiple environment variable
* names instead of a single one - yuck!
*/
const char *names[] = { "pptdevs", "pptdevs2", "pptdevs3", NULL };
/* set pptdevs="1/2/3 4/5/6 7/8/9 10/11/12" */
found = 0;
for (i = 0; names[i] != NULL && !found; i++) {
cp = val = getenv(names[i]);
while (cp != NULL && *cp != '\0') {
if ((cp2 = strchr(cp, ' ')) != NULL)
*cp2 = '\0';
n = sscanf(cp, "%d/%d/%d", &b, &s, &f);
if (n == 3 && bus == b && slot == s && func == f) {
found = 1;
break;
}
if (cp2 != NULL)
*cp2++ = ' ';
cp = cp2;
}
freeenv(val);
}
return (found);
}
void *
vm_iommu_domain(struct vm *vm)
{
return (vm->iommu);
}
int
vcpu_set_state(struct vm *vm, int vcpuid, enum vcpu_state newstate,
bool from_idle)
{
int error;
struct vcpu *vcpu;
if (vcpuid < 0 || vcpuid >= VM_MAXCPU)
panic("vm_set_run_state: invalid vcpuid %d", vcpuid);
vcpu = &vm->vcpu[vcpuid];
vcpu_lock(vcpu);
error = vcpu_set_state_locked(vcpu, newstate, from_idle);
vcpu_unlock(vcpu);
return (error);
}
int
vm_run(struct vm *vm, struct vm_run *vmrun)
{
int error, vcpuid;
struct vcpu *vcpu;
struct pcb *pcb;
uint64_t tscval, rip;
struct vm_exit *vme;
bool retu, intr_disabled;
pmap_t pmap;
vcpuid = vmrun->cpuid;
if (vcpuid < 0 || vcpuid >= VM_MAXCPU)
return (EINVAL);
pmap = vmspace_pmap(vm->vmspace);
vcpu = &vm->vcpu[vcpuid];
vme = &vcpu->exitinfo;
rip = vmrun->rip;
restart:
critical_enter();
KASSERT(!CPU_ISSET(curcpu, &pmap->pm_active),
("vm_run: absurd pm_active"));
tscval = rdtsc();
pcb = PCPU_GET(curpcb);
set_pcb_flags(pcb, PCB_FULL_IRET);
restore_guest_msrs(vm, vcpuid);
restore_guest_fpustate(vcpu);
vcpu_require_state(vm, vcpuid, VCPU_RUNNING);
error = VMRUN(vm->cookie, vcpuid, rip, pmap, &vm->rendezvous_func);
vcpu_require_state(vm, vcpuid, VCPU_FROZEN);
save_guest_fpustate(vcpu);
restore_host_msrs(vm, vcpuid);
vmm_stat_incr(vm, vcpuid, VCPU_TOTAL_RUNTIME, rdtsc() - tscval);
critical_exit();
if (error == 0) {
retu = false;
switch (vme->exitcode) {
case VM_EXITCODE_IOAPIC_EOI:
vioapic_process_eoi(vm, vcpuid,
vme->u.ioapic_eoi.vector);
break;
case VM_EXITCODE_RENDEZVOUS:
vm_handle_rendezvous(vm, vcpuid);
error = 0;
break;
case VM_EXITCODE_HLT:
intr_disabled = ((vme->u.hlt.rflags & PSL_I) == 0);
error = vm_handle_hlt(vm, vcpuid, intr_disabled, &retu);
break;
case VM_EXITCODE_PAGING:
error = vm_handle_paging(vm, vcpuid, &retu);
break;
case VM_EXITCODE_INST_EMUL:
error = vm_handle_inst_emul(vm, vcpuid, &retu);
break;
default:
retu = true; /* handled in userland */
break;
}
}
if (error == 0 && retu == false) {
rip = vme->rip + vme->inst_length;
goto restart;
}
/* copy the exit information */
bcopy(vme, &vmrun->vm_exit, sizeof(struct vm_exit));
return (error);
}
