static int mem_event_disable(struct domain *d, struct mem_event_domain *med)
{
if ( med->ring_page )
{
struct vcpu *v;
mem_event_ring_lock(med);
if ( !list_empty(&med->wq.list) )
{
mem_event_ring_unlock(med);
return -EBUSY;
}
/* Free domU's event channel and leave the other one unbound */
free_xen_event_channel(d, med->xen_port);
/* Unblock all vCPUs */
for_each_vcpu ( d, v )
{
if ( test_and_clear_bit(med->pause_flag, &v->pause_flags) )
{
vcpu_unpause(v);
med->blocked--;
}
}
destroy_ring_for_helper(&med->ring_page,
med->ring_pg_struct);
mem_event_ring_unlock(med);
}
return 0;
}
void domain_vpl011_deinit(struct domain *d)
{
struct vpl011 *vpl011 = &d->arch.vpl011;
if ( !vpl011->ring_buf )
return;
free_xen_event_channel(d, vpl011->evtchn);
destroy_ring_for_helper(&vpl011->ring_buf, vpl011->ring_page);
}
int domain_vpl011_init(struct domain *d, struct vpl011_init_info *info)
{
int rc;
struct vpl011 *vpl011 = &d->arch.vpl011;
if ( vpl011->ring_buf )
return -EINVAL;
/* Map the guest PFN to Xen address space. */
rc = prepare_ring_for_helper(d,
gfn_x(info->gfn),
&vpl011->ring_page,
&vpl011->ring_buf);
if ( rc < 0 )
goto out;
rc = vgic_reserve_virq(d, GUEST_VPL011_SPI);
if ( !rc )
{
rc = -EINVAL;
goto out1;
}
rc = alloc_unbound_xen_event_channel(d, 0, info->console_domid,
vpl011_notification);
if ( rc < 0 )
goto out2;
vpl011->evtchn = info->evtchn = rc;
spin_lock_init(&vpl011->lock);
register_mmio_handler(d, &vpl011_mmio_handler,
GUEST_PL011_BASE, GUEST_PL011_SIZE, NULL);
return 0;
out2:
vgic_free_virq(d, GUEST_VPL011_SPI);
out1:
destroy_ring_for_helper(&vpl011->ring_buf, vpl011->ring_page);
out:
return rc;
}
static int mem_event_enable(
struct domain *d,
xen_domctl_mem_event_op_t *mec,
struct mem_event_domain *med,
int pause_flag,
int param,
xen_event_channel_notification_t notification_fn)
{
int rc;
unsigned long ring_gfn = d->arch.hvm_domain.params[param];
/* Only one helper at a time. If the helper crashed,
* the ring is in an undefined state and so is the guest.
*/
if ( med->ring_page )
return -EBUSY;
/* The parameter defaults to zero, and it should be
* set to something */
if ( ring_gfn == 0 )
return -ENOSYS;
mem_event_ring_lock_init(med);
mem_event_ring_lock(med);
rc = prepare_ring_for_helper(d, ring_gfn, &med->ring_pg_struct,
&med->ring_page);
if ( rc < 0 )
goto err;
/* Set the number of currently blocked vCPUs to 0. */
med->blocked = 0;
/* Allocate event channel */
rc = alloc_unbound_xen_event_channel(d, 0, current->domain->domain_id,
notification_fn);
if ( rc < 0 )
goto err;
med->xen_port = mec->port = rc;
/* Prepare ring buffer */
FRONT_RING_INIT(&med->front_ring,
(mem_event_sring_t *)med->ring_page,
PAGE_SIZE);
/* Save the pause flag for this particular ring. */
med->pause_flag = pause_flag;
/* Initialize the last-chance wait queue. */
init_waitqueue_head(&med->wq);
mem_event_ring_unlock(med);
return 0;
err:
destroy_ring_for_helper(&med->ring_page,
med->ring_pg_struct);
mem_event_ring_unlock(med);
return rc;
}
