The logic for querying hotpluggable CPUs needs to sort the list of CPUs returned by QEMU. Unfortunately our sorting method failed to use the die_id field, so CPUs were not correctly sorted. This is seen when configuring a guest with partially populated CPUs <vcpu placement='static' current='1'>16</vcpu> <cpu...> <topology sockets='4' dies='2' cores='1' threads='2'/> </cpu> Then trying to start it would fail: # virsh -c qemu:///system start demo error: Failed to start domain demo error: internal error: qemu didn't report thread id for vcpu '0' Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com&gt; --- src/qemu/qemu_domain.c | 10 ++++++++-- src/qemu/qemu_monitor.c | 2 ++ src/qemu/qemu_monitor.h | 2 ++ src/qemu/qemu_monitor_json.c | 4 ++++ 4 files changed, 16 insertions(+), 2 deletions(-) diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index 4b467afa81..acb93d24ae 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -13537,8 +13537,14 @@ qemuDomainRefreshVcpuInfo(virQEMUDriverPtr driver, } if (validTIDs) - VIR_DEBUG("vCPU[%zu] PID %llu is valid", - i, (unsigned long long)info[i].tid); + VIR_DEBUG("vCPU[%zu] PID %llu is valid " + "(node=%d socket=%d die=%d core=%d thread=%d)", + i, (unsigned long long)info[i].tid, + info[i].node_id, + info[i].socket_id, + info[i].die_id, + info[i].core_id, + info[i].thread_id); } VIR_DEBUG("Extracting vCPU information validTIDs=%d", validTIDs); diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c index e3d621f038..017b818f73 100644 --- a/src/qemu/qemu_monitor.c +++ b/src/qemu/qemu_monitor.c @@ -1615,6 +1615,7 @@ qemuMonitorCPUInfoClear(qemuMonitorCPUInfoPtr cpus, cpus[i].id = 0; cpus[i].qemu_id = -1; cpus[i].socket_id = -1; + cpus[i].die_id = -1; cpus[i].core_id = -1; cpus[i].thread_id = -1; cpus[i].node_id = -1; @@ -1770,6 +1771,7 @@ qemuMonitorGetCPUInfoHotplug(struct qemuMonitorQueryHotpluggableCpusEntry *hotpl vcpus[mastervcpu].hotpluggable = !!hotplugvcpus[i].alias || !vcpus[mastervcpu].online; vcpus[mastervcpu].socket_id = hotplugvcpus[i].socket_id; + vcpus[mastervcpu].die_id = hotplugvcpus[i].die_id; vcpus[mastervcpu].core_id = hotplugvcpus[i].core_id; vcpus[mastervcpu].thread_id = hotplugvcpus[i].thread_id; vcpus[mastervcpu].node_id = hotplugvcpus[i].node_id; diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h index 6ccea909e9..be4195e734 100644 --- a/src/qemu/qemu_monitor.h +++ b/src/qemu/qemu_monitor.h @@ -561,6 +561,7 @@ struct qemuMonitorQueryHotpluggableCpusEntry { /* topology information -1 if qemu didn't report given parameter */ int node_id; int socket_id; + int die_id; int core_id; int thread_id; @@ -583,6 +584,7 @@ struct _qemuMonitorCPUInfo { /* topology info for hotplug purposes. Hotplug of given vcpu impossible if * all entries are -1 */ int socket_id; + int die_id; int core_id; int thread_id; int node_id; diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c index 3eac80c060..04affb851f 100644 --- a/src/qemu/qemu_monitor_json.c +++ b/src/qemu/qemu_monitor_json.c @@ -8565,6 +8565,7 @@ qemuMonitorJSONProcessHotpluggableCpusReply(virJSONValuePtr vcpu, ignore_value(virJSONValueObjectGetNumberInt(props, "node-id", &entry->node_id)); ignore_value(virJSONValueObjectGetNumberInt(props, "socket-id", &entry->socket_id)); + ignore_value(virJSONValueObjectGetNumberInt(props, "die-id", &entry->die_id)); ignore_value(virJSONValueObjectGetNumberInt(props, "core-id", &entry->core_id)); ignore_value(virJSONValueObjectGetNumberInt(props, "thread-id", &entry->thread_id)); @@ -8599,6 +8600,9 @@ qemuMonitorQueryHotpluggableCpusEntrySort(const void *p1, if (a->socket_id != b->socket_id) return a->socket_id - b->socket_id; + if (a->die_id != b->die_id) + return a->die_id - b->die_id; + if (a->core_id != b->core_id) return a->core_id - b->core_id; -- 2.24.1