void domain_resume(struct domain *d)
{
struct vcpu *v;
/*
* Some code paths assume that shutdown status does not get reset under
* their feet (e.g., some assertions make this assumption).
*/
domain_pause(d);
spin_lock(&d->shutdown_lock);
d->is_shutting_down = d->is_shut_down = 0;
d->shutdown_code = -1;
for_each_vcpu ( d, v )
{
if ( v->paused_for_shutdown )
vcpu_unpause(v);
v->paused_for_shutdown = 0;
}
spin_unlock(&d->shutdown_lock);
domain_unpause(d);
}
static void freeze_domains(void)
{
struct domain *d;
rcu_read_lock(&domlist_read_lock);
/*
* Note that we iterate in order of domain-id. Hence we will pause dom0
* first which is required for correctness (as only dom0 can add domains to
* the domain list). Otherwise we could miss concurrently-created domains.
*/
for_each_domain ( d )
domain_pause(d);
rcu_read_unlock(&domlist_read_lock);
}
void domain_kill(struct domain *d)
{
struct vcpu *v;
domain_pause(d);
if ( !test_and_set_bit(_DOMF_dying, &d->domain_flags) )
{
for_each_vcpu(d, v)
sched_rem_domain(v);
gnttab_release_mappings(d);
domain_relinquish_resources(d);
put_domain(d);
send_guest_virq(dom0->vcpu[0], VIRQ_DOM_EXC);
}
}
static void freeze_domains(void)
{
struct domain *d;
struct vcpu *v;
rcu_read_lock(&domlist_read_lock);
for_each_domain ( d )
{
switch ( d->domain_id )
{
case 0:
for_each_vcpu ( d, v )
if ( v != current )
vcpu_pause(v);
break;
default:
domain_pause(d);
break;
}
}
rcu_read_unlock(&domlist_read_lock);
}
int domain_kill(struct domain *d)
{
int rc = 0;
if ( d == current->domain )
return -EINVAL;
/* Protected by domctl_lock. */
switch ( d->is_dying )
{
case DOMDYING_alive:
domain_pause(d);
d->is_dying = DOMDYING_dying;
spin_barrier(&d->domain_lock);
evtchn_destroy(d);
gnttab_release_mappings(d);
tmem_destroy(d->tmem);
d->tmem = NULL;
/* fallthrough */
case DOMDYING_dying:
rc = domain_relinquish_resources(d);
if ( rc != 0 )
{
BUG_ON(rc != -EAGAIN);
break;
}
d->is_dying = DOMDYING_dead;
put_domain(d);
send_guest_global_virq(dom0, VIRQ_DOM_EXC);
/* fallthrough */
case DOMDYING_dead:
break;
}
return rc;
}
int arch_monitor_domctl_event(struct domain *d,
struct xen_domctl_monitor_op *mop)
{
struct arch_domain *ad = &d->arch;
bool_t requested_status = (XEN_DOMCTL_MONITOR_OP_ENABLE == mop->op);
switch ( mop->event )
{
case XEN_DOMCTL_MONITOR_EVENT_WRITE_CTRLREG:
{
unsigned int ctrlreg_bitmask;
bool_t old_status;
/* sanity check: avoid left-shift undefined behavior */
if ( unlikely(mop->u.mov_to_cr.index > 31) )
return -EINVAL;
ctrlreg_bitmask = monitor_ctrlreg_bitmask(mop->u.mov_to_cr.index);
old_status = !!(ad->monitor.write_ctrlreg_enabled & ctrlreg_bitmask);
if ( unlikely(old_status == requested_status) )
return -EEXIST;
domain_pause(d);
if ( mop->u.mov_to_cr.sync )
ad->monitor.write_ctrlreg_sync |= ctrlreg_bitmask;
else
ad->monitor.write_ctrlreg_sync &= ~ctrlreg_bitmask;
if ( mop->u.mov_to_cr.onchangeonly )
ad->monitor.write_ctrlreg_onchangeonly |= ctrlreg_bitmask;
else
ad->monitor.write_ctrlreg_onchangeonly &= ~ctrlreg_bitmask;
if ( requested_status )
ad->monitor.write_ctrlreg_enabled |= ctrlreg_bitmask;
else
ad->monitor.write_ctrlreg_enabled &= ~ctrlreg_bitmask;
if ( VM_EVENT_X86_CR3 == mop->u.mov_to_cr.index )
{
struct vcpu *v;
/* Latches new CR3 mask through CR0 code. */
for_each_vcpu ( d, v )
hvm_update_guest_cr(v, 0);
}
domain_unpause(d);
break;
}
case XEN_DOMCTL_MONITOR_EVENT_MOV_TO_MSR:
{
bool_t old_status;
int rc;
u32 msr = mop->u.mov_to_msr.msr;
domain_pause(d);
old_status = monitored_msr(d, msr);
if ( unlikely(old_status == requested_status) )
{
domain_unpause(d);
return -EEXIST;
}
if ( requested_status )
rc = monitor_enable_msr(d, msr);
else
rc = monitor_disable_msr(d, msr);
domain_unpause(d);
return rc;
}
case XEN_DOMCTL_MONITOR_EVENT_SINGLESTEP:
{
bool_t old_status = ad->monitor.singlestep_enabled;
if ( unlikely(old_status == requested_status) )
return -EEXIST;
domain_pause(d);
ad->monitor.singlestep_enabled = requested_status;
domain_unpause(d);
break;
}
case XEN_DOMCTL_MONITOR_EVENT_SOFTWARE_BREAKPOINT:
{
bool_t old_status = ad->monitor.software_breakpoint_enabled;
if ( unlikely(old_status == requested_status) )
return -EEXIST;
domain_pause(d);
ad->monitor.software_breakpoint_enabled = requested_status;
domain_unpause(d);
break;
}
case XEN_DOMCTL_MONITOR_EVENT_DEBUG_EXCEPTION:
{
bool_t old_status = ad->monitor.debug_exception_enabled;
if ( unlikely(old_status == requested_status) )
return -EEXIST;
domain_pause(d);
ad->monitor.debug_exception_enabled = requested_status;
ad->monitor.debug_exception_sync = requested_status ?
mop->u.debug_exception.sync :
0;
domain_unpause(d);
break;
}
case XEN_DOMCTL_MONITOR_EVENT_CPUID:
{
bool_t old_status = ad->monitor.cpuid_enabled;
if ( unlikely(old_status == requested_status) )
return -EEXIST;
domain_pause(d);
ad->monitor.cpuid_enabled = requested_status;
domain_unpause(d);
break;
}
default:
/*
* Should not be reached unless arch_monitor_get_capabilities() is
* not properly implemented.
*/
ASSERT_UNREACHABLE();
return -EOPNOTSUPP;
}
return 0;
}
int monitor_domctl(struct domain *d, struct xen_domctl_monitor_op *mop)
{
int rc;
struct arch_domain *ad = &d->arch;
uint32_t capabilities = get_capabilities(d);
rc = xsm_vm_event_control(XSM_PRIV, d, mop->op, mop->event);
if ( rc )
return rc;
switch ( mop->op )
{
case XEN_DOMCTL_MONITOR_OP_GET_CAPABILITIES:
mop->event = capabilities;
return 0;
case XEN_DOMCTL_MONITOR_OP_EMULATE_EACH_REP:
d->arch.mem_access_emulate_each_rep = !!mop->event;
return 0;
}
/*
* Sanity check
*/
if ( mop->op != XEN_DOMCTL_MONITOR_OP_ENABLE &&
mop->op != XEN_DOMCTL_MONITOR_OP_DISABLE )
return -EOPNOTSUPP;
/* Check if event type is available. */
if ( !(capabilities & (1 << mop->event)) )
return -EOPNOTSUPP;
switch ( mop->event )
{
case XEN_DOMCTL_MONITOR_EVENT_WRITE_CTRLREG:
{
unsigned int ctrlreg_bitmask =
monitor_ctrlreg_bitmask(mop->u.mov_to_cr.index);
bool_t status =
!!(ad->monitor.write_ctrlreg_enabled & ctrlreg_bitmask);
struct vcpu *v;
rc = status_check(mop, status);
if ( rc )
return rc;
if ( mop->u.mov_to_cr.sync )
ad->monitor.write_ctrlreg_sync |= ctrlreg_bitmask;
else
ad->monitor.write_ctrlreg_sync &= ~ctrlreg_bitmask;
if ( mop->u.mov_to_cr.onchangeonly )
ad->monitor.write_ctrlreg_onchangeonly |= ctrlreg_bitmask;
else
ad->monitor.write_ctrlreg_onchangeonly &= ~ctrlreg_bitmask;
domain_pause(d);
if ( !status )
ad->monitor.write_ctrlreg_enabled |= ctrlreg_bitmask;
else
ad->monitor.write_ctrlreg_enabled &= ~ctrlreg_bitmask;
domain_unpause(d);
if ( mop->u.mov_to_cr.index == VM_EVENT_X86_CR3 )
/* Latches new CR3 mask through CR0 code */
for_each_vcpu ( d, v )
hvm_update_guest_cr(v, 0);
break;
}
case XEN_DOMCTL_MONITOR_EVENT_MOV_TO_MSR:
{
bool_t status = ad->monitor.mov_to_msr_enabled;
rc = status_check(mop, status);
if ( rc )
return rc;
if ( mop->op == XEN_DOMCTL_MONITOR_OP_ENABLE &&
mop->u.mov_to_msr.extended_capture )
{
if ( hvm_enable_msr_exit_interception(d) )
ad->monitor.mov_to_msr_extended = 1;
else
return -EOPNOTSUPP;
} else
ad->monitor.mov_to_msr_extended = 0;
domain_pause(d);
ad->monitor.mov_to_msr_enabled = !status;
domain_unpause(d);
break;
}
case XEN_DOMCTL_MONITOR_EVENT_SINGLESTEP:
{
bool_t status = ad->monitor.singlestep_enabled;
rc = status_check(mop, status);
if ( rc )
return rc;
domain_pause(d);
ad->monitor.singlestep_enabled = !status;
domain_unpause(d);
break;
}
case XEN_DOMCTL_MONITOR_EVENT_SOFTWARE_BREAKPOINT:
{
bool_t status = ad->monitor.software_breakpoint_enabled;
rc = status_check(mop, status);
if ( rc )
return rc;
domain_pause(d);
ad->monitor.software_breakpoint_enabled = !status;
domain_unpause(d);
break;
}
case XEN_DOMCTL_MONITOR_EVENT_GUEST_REQUEST:
{
bool_t status = ad->monitor.guest_request_enabled;
rc = status_check(mop, status);
if ( rc )
return rc;
ad->monitor.guest_request_sync = mop->u.guest_request.sync;
domain_pause(d);
ad->monitor.guest_request_enabled = !status;
domain_unpause(d);
break;
}
default:
return -EOPNOTSUPP;
};
return 0;
}
void domain_pause_by_systemcontroller(struct domain *d)
{
domain_pause(d);
if ( test_and_set_bool(d->is_paused_by_controller) )
domain_unpause(d);
}