When qemu libvirt driver doesn't support guest CPU selection with given qemu binary, guests requiring specific CPU should fail to start instead of being silently supplied with a default CPU. --- src/qemu/qemu_conf.c | 13 ++++++++++--- 1 files changed, 10 insertions(+), 3 deletions(-) diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c index 592360f..3fb0074 100644 --- a/src/qemu/qemu_conf.c +++ b/src/qemu/qemu_conf.c @@ -3249,9 +3249,16 @@ qemuBuildCpuArgStr(const struct qemud_driver *driver, virBuffer buf = VIR_BUFFER_INITIALIZER; int i; - if (def->cpu && def->cpu->model - && qemudProbeCPUModels(emulator, ut->machine, &ncpus, &cpus) < 0) - goto cleanup; + if (def->cpu && def->cpu->model) { + if (qemudProbeCPUModels(emulator, ut->machine, &ncpus, &cpus) < 0) + goto cleanup; + + if (!ncpus || !host) { + qemuReportError(VIR_ERR_NO_SUPPORT, "%s", + _("CPU specification not supported by hypervisor")); + goto cleanup; + } + } if (ncpus > 0 && host) { virCPUCompareResult cmp;