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xenvm: evtchn: expand Xen event channel driver functionality

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This commit adds new functions, which can be used for Xen event channel
management (allocation, interdomain binding etc.). Such functionality
is needed for Xen PV driver development in Zephyr.

Signed-off-by: Dmytro Firsov <dmytro_firsov@epam.com>
This commit is contained in:
Dmytro Firsov 2022-02-10 13:13:11 +02:00 • committed by Carles Cufí
commit a76b492f04
3 changed files with 233 additions and 2 deletions
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63
drivers/xen/events.c
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@ -29,6 +29,68 @@ static void empty_callback(void *data)
events_missed[port] = true;
}
int alloc_unbound_event_channel(domid_t remote_dom)
{
int rc;
struct evtchn_alloc_unbound alloc = {
.dom = DOMID_SELF,
.remote_dom = remote_dom,
};
rc = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound, &alloc);
if (rc == 0) {
rc = alloc.port;
}
return rc;
}
int bind_interdomain_event_channel(domid_t remote_dom, evtchn_port_t remote_port,
evtchn_cb_t cb, void *data)
{
int rc;
struct evtchn_bind_interdomain bind = {
.remote_dom = remote_dom,
.remote_port = remote_port,
};
rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain, &bind);
if (rc < 0) {
return rc;
}
rc = bind_event_channel(bind.local_port, cb, data);
if (rc < 0) {
return rc;
}
return bind.local_port;
}
int evtchn_status(evtchn_status_t *status)
{
return HYPERVISOR_event_channel_op(EVTCHNOP_status, status);
}
int evtchn_close(evtchn_port_t port)
{
struct evtchn_close close = {
.port = port,
};
return HYPERVISOR_event_channel_op(EVTCHNOP_close, &close);
}
int evtchn_set_priority(evtchn_port_t port, uint32_t priority)
{
struct evtchn_set_priority set = {
.port = port,
.priority = priority,
};
return HYPERVISOR_event_channel_op(EVTCHNOP_set_priority, &set);
}
void notify_evtchn(evtchn_port_t port)
{
struct evtchn_send send;
@ -50,7 +112,6 @@ int bind_event_channel(evtchn_port_t port, evtchn_cb_t cb, void *data)
__ASSERT(cb != NULL, "%s: NULL callback for evtchn #%u\n",
__func__, port);
if (event_channels[port].cb != empty_callback)
LOG_WRN("%s: re-bind callback for evtchn #%u\n",
__func__, port);