Investigation of a problem with creating passthrough macvtap devices (https://bugzilla.redhat.com/show_bug.cgi?id=1185501) has shown that this slightly more verbose failure message is useful. In particular, the mac address can be used to determine the domain. You could also figure this out by looking at preceding messages in a debug log, but this gets it in a single place. --- src/util/virnetdevmacvlan.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/src/util/virnetdevmacvlan.c b/src/util/virnetdevmacvlan.c index dd66955..5fd2097 100644 --- a/src/util/virnetdevmacvlan.c +++ b/src/util/virnetdevmacvlan.c @@ -107,6 +107,7 @@ virNetDevMacVLanCreate(const char *ifname, unsigned int recvbuflen; struct nl_msg *nl_msg; struct nlattr *linkinfo, *info_data; + char macstr[VIR_MAC_STRING_BUFLEN]; if (virNetDevGetIndex(srcdev, &ifindex) < 0) return -1; @@ -177,8 +178,9 @@ virNetDevMacVLanCreate(const char *ifname, default: virReportSystemError(-err->error, - _("error creating %s type of interface attach to %s"), - type, srcdev); + _("error creating %s interface %s@%s (%s)"), + type, ifname, srcdev, + virMacAddrFormat(macaddress, macstr)); goto cleanup; } break;