When you do "cpu_set <n> online" where <n> > current number of cpus, qemu-kvm will end up crashing when qdev finds hotplug is not enabled. Let's instead gracefully refuse.
See https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/878422 for the related bug report. Signed-off-by: Serge Hallyn <serge.hal...@canonical.com> --- hw/acpi_piix4.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/hw/acpi_piix4.c b/hw/acpi_piix4.c index 1b35707..5e95569 100644 --- a/hw/acpi_piix4.c +++ b/hw/acpi_piix4.c @@ -589,12 +589,17 @@ void qemu_system_cpu_hot_add(int cpu, int state) PIIX4PMState *s = global_piix4_pm_state; if (state && !qemu_get_cpu(cpu)) { +#if 1 + fprintf(stderr, "cpu hotplug not supported\n", cpu); + return; +#else env = pc_new_cpu(global_cpu_model); if (!env) { fprintf(stderr, "cpu %d creation failed\n", cpu); return; } env->cpuid_apic_id = cpu; +#endif } if (state) -- 1.7.5.4
