** Changed in: qemu Status: Fix Committed => Fix Released -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1739413
Title: Hotplugged vcpu does not guarantee cpu compat mode(power8) on power9 host Status in QEMU: Fix Released Bug description: ./ppc64-softmmu/qemu-system-ppc64 -version QEMU emulator version 2.11.50 (v2.11.0-254-gaf35267) 1. Boot a power8 compat mode guest power9 HW. ./ppc64-softmmu/qemu-system-ppc64 -machine pseries,accel=kvm,max-cpu-compat=power8 -m 4096 /home/sath/images/guest.qcow2 -smp 1,maxcpus=2 -serial /dev/pts/8 -monitor stdio -vga none -nographic QEMU 2.11.50 monitor - type 'help' for more information (qemu) 2. Check for cpuinfo # cat /proc/cpuinfo processor : 0 cpu : POWER8 (architected), altivec supported clock : 2200.000000MHz revision : 2.1 (pvr 004e 1201) timebase : 512000000 platform : pSeries model : IBM pSeries (emulated by qemu) machine : CHRP IBM pSeries (emulated by qemu) MMU : Hash 3. Run a small program invoking isa v3.0 instruction, it should complain 'Illegal instruction' as it is a power8 compat guest # cat 1.c #include <stdio.h> void main() { asm volatile (".long 0x7c0005e6"); } # ./a.out [ 59.352795] a.out[1741]: unhandled signal 4 at 0000000010000600 nip 0000000010000600 lr 00007fffb4da5080 code 1 Illegal instruction 4. Hotplug a vcpu (qemu) device_add host-spapr-cpu-core,id=core1,core-id=1 (qemu) info cpus * CPU #0: nip=0xc0000000000de42c thread_id=113110 CPU #1: nip=0xc0000000000de42c thread_id=113348 5. Try running the same program in the hotplugged vcpu and it does not complain as 'Illegal instruction' #taskset -c 1 ./a.out ----------------------NOK # # taskset -c 0 ./a.out [ 356.618031] a.out[1755]: unhandled signal 4 at 0000000010000600 nip 0000000010000600 lr 00007fffae7f5080 code 1 Illegal instruction To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1739413/+subscriptions