On Tue, Jan 27, 2015 at 7:30 AM, Zhu Guihua <zhugh.f...@cn.fujitsu.com> wrote: > On Mon, 2015-01-26 at 12:27 +0100, Alexandre DERUMIER wrote: >> >>About this, I can do it successfully on my qemu. >> >>So can you tell us more information about your operation? >> simply start with >> >> -smp 2,sockets=2,cores=2,maxcpus=4 -device kvm64-x86_64-cpu,apic-id=2,id=cpu2 >> >> then >> >> #device_del cpu2 >> >> Guest return >> [ 324.195024] Unregister pv shared memory for cpu 2 >> [ 324.250579] smpboot: CPU 2 is now offline >> >> but cpu is not remove in qemu. >> >> I had also try to eject manualy from guest >> echo 1 > /sys/bus/acpi/devices/LNXCPU\:02/eject >> >> But I have this error message >> ACPI: \_SB_.CP02: Eject incomplete - status 0xf >> >> (maybe is it normal ? or maybe is it a guest bug (kernel 3.16 from debian >> wheezy backports) ?) >> > > According to your description, the guest has invoked _EJ0 method, but > the method was executed unsuccessfully. > Thus, only hot-unplug request was invoked in qemu, but hot-unplug was > not so that cpu was still in qemu. > > Did you test any other kernel version? I will try kernel 3.16 to > investigate this problem later.
Not sure if it is exactly same, but I had similar problem as seen by Alexandre when I had tried this patchset earlier and it was resolved by using iasl and regenerating the ACPI tables. Ref: http://lists.nongnu.org/archive/html/qemu-devel/2014-09/msg02993.html Regards, Bharata.
