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+Hotplugged vcpu does not guarantee cpu compat mode(power8) on power9 host
+
+./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
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