/* Registered with Xen-bound event channel for incoming notifications. */
static void mem_access_notification(struct vcpu *v, unsigned int port)
{
if ( likely(v->domain->mem_event->access.ring_page != NULL) )
mem_access_resume(v->domain);
}
/*
* Pull all responses from the given ring and unpause the corresponding vCPU
* if required. Based on the response type, here we can also call custom
* handlers.
*
* Note: responses are handled the same way regardless of which ring they
* arrive on.
*/
void vm_event_resume(struct domain *d, struct vm_event_domain *ved)
{
vm_event_response_t rsp;
/* Pull all responses off the ring. */
while ( vm_event_get_response(d, ved, &rsp) )
{
struct vcpu *v;
if ( rsp.version != VM_EVENT_INTERFACE_VERSION )
{
printk(XENLOG_G_WARNING "vm_event interface version mismatch\n");
continue;
}
/* Validate the vcpu_id in the response. */
if ( (rsp.vcpu_id >= d->max_vcpus) || !d->vcpu[rsp.vcpu_id] )
continue;
v = d->vcpu[rsp.vcpu_id];
/*
* In some cases the response type needs extra handling, so here
* we call the appropriate handlers.
*/
switch ( rsp.reason )
{
case VM_EVENT_REASON_MOV_TO_MSR:
case VM_EVENT_REASON_WRITE_CTRLREG:
vm_event_register_write_resume(v, &rsp);
break;
#ifdef CONFIG_HAS_MEM_ACCESS
case VM_EVENT_REASON_MEM_ACCESS:
mem_access_resume(v, &rsp);
break;
#endif
#ifdef CONFIG_HAS_MEM_PAGING
case VM_EVENT_REASON_MEM_PAGING:
p2m_mem_paging_resume(d, &rsp);
break;
#endif
};
/* Check for altp2m switch */
if ( rsp.flags & VM_EVENT_FLAG_ALTERNATE_P2M )
p2m_altp2m_check(v, rsp.altp2m_idx);
if ( rsp.flags & VM_EVENT_FLAG_VCPU_PAUSED )
{
if ( rsp.flags & VM_EVENT_FLAG_SET_REGISTERS )
vm_event_set_registers(v, &rsp);
if ( rsp.flags & VM_EVENT_FLAG_TOGGLE_SINGLESTEP )
vm_event_toggle_singlestep(d, v);
vm_event_vcpu_unpause(v);
}
}
}
