On Fri, Sep 12, 2014 at 6:54 AM, Gu Zheng <guz.f...@cn.fujitsu.com> wrote: > Is guest os enabled acpi cpu hotplug? What's the guest's cpu info? > Please try latest QEMU, and any feedback is welcome. >
Tried with latest QEMU git + your patchset and Fedora 20 guest, but QEMU monitor still shows the removed CPU. Guest kernel messages during hotplug: [root@localhost cpu]# echo 1 > cpu8/online [ 72.936069] smpboot: Booting Node 0 Processor 8 APIC 0x8 [ 0.003000] kvm-clock: cpu 8, msr 0:7ffc9201, secondary cpu clock [ 72.950003] TSC synchronization [CPU#0 -> CPU#8]: [ 72.950003] Measured 199886723309 cycles TSC warp between CPUs, turning off TSC clock. [ 72.950003] tsc: Marking TSC unstable due to check_tsc_sync_source failed [ 72.972976] KVM setup async PF for cpu 8 [ 72.973648] kvm-stealtime: cpu 8, msr 7d30df00 [ 72.974415] Will online and init hotplugged CPU: 8 [ 72.975307] microcode: CPU8 sig=0x663, pf=0x1, revision=0x1 Guest kernel messages during hotunplug: [root@localhost cpu]# [ 95.482172] Unregister pv shared memory for cpu 8 [ 95.487169] smpboot: CPU 8 is now offline [ 95.488667] ACPI: Device does not support D3cold Guest cpuinfo (showing for the last CPU only after adding and removing CPU 8) processor : 7 vendor_id : GenuineIntel cpu family : 6 model : 6 model name : QEMU Virtual CPU version 2.1.50 stepping : 3 microcode : 0x1 cpu MHz : 2899.998 cache size : 4096 KB fpu : yes fpu_exception : yes cpuid level : 4 wp : yes flags : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pse36 clflush mmx fxsr sse sse2 syscall nx lm rep_good nopl pni cx16 x2apic popcnt hypervisor lahf_lm bogomips : 5799.99 clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: [root@localhost boot]# grep -ir hot config-3.11.10-301.fc20.x86_64 CONFIG_TICK_ONESHOT=y # CONFIG_MEMORY_HOTPLUG is not set CONFIG_HOTPLUG_CPU=y # CONFIG_BOOTPARAM_HOTPLUG_CPU0 is not set # CONFIG_DEBUG_HOTPLUG_CPU0 is not set CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y CONFIG_ACPI_HOTPLUG_CPU=y CONFIG_HOTPLUG_PCI_PCIE=y CONFIG_HOTPLUG_PCI=y CONFIG_HOTPLUG_PCI_ACPI=y CONFIG_HOTPLUG_PCI_ACPI_IBM=m # CONFIG_HOTPLUG_PCI_CPCI is not set CONFIG_HOTPLUG_PCI_SHPC=m
