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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https://bugs.launchpad.net/bugs/1780928
Title:
v2.12.0-2321-gb34181056c: vcpu hotplug crashes qemu-kvm with segfault
Status in QEMU:
Confirmed
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
ppc64le)
/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
file=/var/lib/avocado/data/avocado-vt/images/jeos-27-ppc64le.qcow2,format=qcow2,if=none,id=drive1
-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
user,model=virtio-net-pci
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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