After live change of cpu counts, the number of processor threads is verified. This patch makes use of this approach to check if qemu ignored the request for cpu hot-unplug and report an appropriate message. --- src/qemu/qemu_driver.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index 39175f4..c4be130 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -3697,6 +3697,15 @@ static int qemuDomainHotplugVcpus(virQEMUDriverPtr driver, goto cleanup; } + /* check if hotplug has failed */ + if (vcpus < oldvcpus && ncpupids == oldvcpus) { + virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s", + _("qemu didn't unplug the vCPUs properly")); + vcpus = oldvcpus; + ret = -1; + goto cleanup; + } + if (ncpupids != vcpus) { virReportError(VIR_ERR_INTERNAL_ERROR, _("got wrong number of vCPU pids from QEMU monitor. " -- 1.8.1