[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [mini-os master] Mini-OS: get own domid
commit b702dbdfc0dec45491abc9e31e23c37f95293b5b Author: Juergen Gross <jgross@xxxxxxxx> AuthorDate: Tue Nov 21 10:49:50 2023 +0100 Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> CommitDate: Tue Nov 21 21:05:11 2023 +0000 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> Reviewed-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx> --- events.c | 33 +++++++++++++++++++++++++++++++++ include/lib.h | 3 +++ 2 files changed, 36 insertions(+) diff --git a/events.c b/events.c index cdae90f..4683e8e 100644 --- a/events.c +++ b/events.c @@ -261,6 +261,39 @@ int evtchn_get_peercontext(evtchn_port_t local_port, char *ctx, int size) return rc; } +/* Replace below when a hypercall is available to get the domid. */ +domid_t 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/lib.h b/include/lib.h index fd8c36d..dd68985 100644 --- a/include/lib.h +++ b/include/lib.h @@ -154,6 +154,9 @@ do { \ /* Consistency check as much as possible. */ void sanity_check(void); +/* Get own domid. */ +domid_t get_domid(void); + #ifdef HAVE_LIBC extern struct wait_queue_head event_queue; -- generated by git-patchbot for /home/xen/git/mini-os.git#master
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