[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v2 2/5] Mini-OS: get own domid
Get the own domid via creation of a temporary event channel. There is no "official" way to read the own domid in PV guests, so use the event channel interface to get it: - allocate an unbound event channel specifying DOMID_SELF for the other end - read the event channel status which will contain the own domid in unbound.dom - close the event channel Signed-off-by: Juergen Gross <jgross@xxxxxxxx --- V2: - new patch Signed-off-by: Juergen Gross <jgross@xxxxxxxx> --- events.c | 32 ++++++++++++++++++++++++++++++++ include/events.h | 2 ++ 2 files changed, 34 insertions(+) diff --git a/events.c b/events.c index cdae90f4..af9f9f9e 100644 --- a/events.c +++ b/events.c @@ -261,6 +261,38 @@ int evtchn_get_peercontext(evtchn_port_t local_port, char *ctx, int size) return rc; } +domid_t evtchn_get_domid(void) +{ + int rc; + domid_t domid = DOMID_INVALID; + evtchn_alloc_unbound_t op; + struct evtchn_status status; + struct evtchn_close close; + + op.dom = DOMID_SELF; + op.remote_dom = DOMID_SELF; + rc = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound, &op); + if ( rc ) + { + printk("ERROR: alloc_unbound failed with rc=%d", rc); + return domid; + } + + status.dom = DOMID_SELF; + status.port = op.port; + rc = HYPERVISOR_event_channel_op(EVTCHNOP_status, &status); + if ( rc ) + printk("ERROR: EVTCHNOP_status failed with rc=%d", rc); + else + domid = status.u.unbound.dom; + + close.port = op.port; + rc = HYPERVISOR_event_channel_op(EVTCHNOP_close, &close); + if ( rc ) + printk("WARN: close_port %d failed rc=%d. ignored\n", close.port, rc); + + return domid; +} /* * Local variables: diff --git a/include/events.h b/include/events.h index 705ad93a..87311481 100644 --- a/include/events.h +++ b/include/events.h @@ -57,4 +57,6 @@ static inline int notify_remote_via_evtchn(evtchn_port_t port) void fini_events(void); void suspend_events(void); +domid_t evtchn_get_domid(void); + #endif /* _EVENTS_H_ */ -- 2.35.3
|
Lists.xenproject.org is hosted with RackSpace, monitoring our |