On 09.05.20 00:28, Boris Ostrovsky wrote:
Commit a926f81d2f6c ("xen/cpuhotplug: Replace cpu_up/down() with device_online/offline()") replaced cpu_down() with device_offline() call which requires that the CPU has been registered before. This registration, however, happens later from topology_init() which is called as subsys_initcall(). setup_vcpu_hotplug_event(), on the other hand, is invoked earlier, during arch_initcall().As result, booting a PV(H) guest with vcpus < maxvcpus causes a crash. Move setup_vcpu_hotplug_event() (and therefore setup_cpu_watcher()) to late_initcall(). In addition, instead of performing all offlining steps in setup_cpu_watcher() simply call disable_hotplug_cpu(). Fixes: a926f81d2f6c (xen/cpuhotplug: Replace cpu_up/down() with device_online/offline()" Signed-off-by: Boris Ostrovsky <[email protected]>
Reviewed-by: Juergen Gross <[email protected]> Juergen
