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[Qemu-devel] [Bug 1780928] Re: v2.12.0-2321-gb34181056c: vcpu hotplug cr

From: Bharata B Rao
Subject: [Qemu-devel] [Bug 1780928] Re: v2.12.0-2321-gb34181056c: vcpu hotplug crashes qemu-kvm with segfault
Date: Tue, 10 Jul 2018 09:25:53 -0000

Reverting the below comment makes CPU hotplug work again:

commit a028dd423ee6dfd091a8c63028240832bf10f671

    ppc/xics: introduce ICP DeviceRealize and DeviceReset handlers
    This changes the ICP realize and reset handlers in DeviceRealize and
    DeviceReset handlers. parent handlers are now called from the
    inheriting classes which is a cleaner object pattern.

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  v2.12.0-2321-gb34181056c: vcpu hotplug crashes qemu-kvm with segfault

Status in QEMU:

Bug description:
  vcpu hotplug crashes upstream qemu(v2.12.0-2321-gb34181056c), vcpu
  hotplug works fine in v2.12.0-rc4.

  Host: Power8, kernel: 4.18.0-rc2-00037-g6f0d349d922b
  Guest: Power8, kernel: 4.18.0-rc3-00183-gc42c12a90545 (base image: fedora27 

  /usr/share/avocado-plugins-vt/build/qemu/ppc64-softmmu/qemu-system-ppc64 -M 
pseries,accel=kvm,max-cpu-compat=power8 -m 8192 -device 
virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x2 -drive 
 -device scsi-hd,drive=drive1,bus=scsi0.0 -smp 
1,cores=1,threads=1,sockets=1,maxcpus=8 -serial /dev/pts/0 -monitor stdio -vga 
none -nographic -kernel /home/kvmci/linux/vmlinux -append 'root=/dev/sda2 rw 
console=tty0 console=ttyS0,115200 init=/sbin/init initcall_debug' -nic 
  QEMU 2.12.50 monitor - type 'help' for more information
  (qemu) device_add host-spapr-cpu-core,id=core1,core-id=1
  Segmentation fault (core dumped)

  Guest initial cpu:
  # lscpu
  Architecture:        ppc64le
  Byte Order:          Little Endian
  CPU(s):              1
  On-line CPU(s) list: 0
  Thread(s) per core:  1
  Core(s) per socket:  1
  Socket(s):           1
  NUMA node(s):        1
  Model:               2.1 (pvr 004b 0201)
  Model name:          POWER8 (architected), altivec supported
  Hypervisor vendor:   KVM
  Virtualization type: para
  L1d cache:           64K
  L1i cache:           32K
  NUMA node0 CPU(s):   0

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