qemu-2.7.1 built from source still got this issue.
But it can be fixed by using qemu-2.10.0 built from source.

# export QEMU=/home/ubuntu/qemu-2.10.0/ppc64-softmmu/qemu-system-ppc64 
# MIGRATION=yes TESTNAME=sprs TIMEOUT=90s ACCEL= ./powerpc/run powerpc/sprs.elf 
-smp 1 -append '-w'
run_migration timeout -k 1s --foreground 90s 
/home/ubuntu/qemu-2.10.0/ppc64-softmmu/qemu-system-ppc64 -nodefaults -machine 
pseries,accel=kvm -bios powerpc/boot_rom.bin -display none -serial stdio 
-kernel powerpc/sprs.elf -smp 1 -append -w # -initrd /tmp/tmp.dKAYkHnAZh
Settings SPRs to 0xcafefacec0debabe...
Now migrate the VM, then press a key or send NMI...

Checking SPRs...
PASS: SPR 3:    0x0000000000debabe <==> 0x0000000000debabe
PASS: SPR 13:   0xcafefacec0debabe <==> 0xcafefacec0debabe
PASS: SPR 17:   0x0000000000debabe <==> 0x0000000000debabe
PASS: SPR 18:   0x00000000c0debabe <==> 0x00000000c0debabe
PASS: SPR 19:   0xcafefacec0debabe <==> 0xcafefacec0debabe
PASS: SPR 29:   0xcafefacec0debabe <==> 0xcafefacec0debabe
PASS: SPR 61:   0x4054504440541014 <==> 0x4054504440541014
PASS: SPR 153:  0x0a00000000000084 <==> 0x0a00000000000084
PASS: SPR 157:  0xcfffffcfc0cfffff <==> 0xcfffffcfc0cfffff
PASS: SPR 159:  0x00000000c0debabe <==> 0x00000000c0debabe
PASS: SPR 256:  0x00000000c0debabe <==> 0x00000000c0debabe
PASS: SPR 259:  0xcafefacec0debabe <==> 0xcafefacec0debabe
PASS: SPR 274:  0xcafefacec0debabe <==> 0xcafefacec0debabe
PASS: SPR 275:  0xcafefacec0debabe <==> 0xcafefacec0debabe
PASS: SPR 769:  0xcafefacec0debabe <==> 0xcafefacec0debabe
PASS: SPR 770:  0xcafefacec006babe <==> 0xcafefacec006babe
PASS: SPR 771:  0x00000000c0debabe <==> 0x00000000c0debabe
PASS: SPR 772:  0x00000000c0debabe <==> 0x00000000c0debabe
PASS: SPR 773:  0x00000000c0debabe <==> 0x00000000c0debabe
PASS: SPR 774:  0x00000000c0debabe <==> 0x00000000c0debabe
PASS: SPR 775:  0x00000000c0debabe <==> 0x00000000c0debabe
PASS: SPR 776:  0x00000000c0debabe <==> 0x00000000c0debabe
PASS: SPR 779:  0x00000000fa8b1afe <==> 0x00000000fa8b1afe
PASS: SPR 780:  0xcafefacec0debabc <==> 0xcafefacec0debabc
PASS: SPR 781:  0xcafefacec0debabe <==> 0xcafefacec0debabe
PASS: SPR 782:  0xcafefacec0debabe <==> 0xcafefacec0debabe
PASS: SPR 784:  0xcafefacec0debabe <==> 0xcafefacec0debabe
PASS: SPR 785:  0xcafefacec0debabe <==> 0xcafefacec0debabe
PASS: SPR 786:  0xcafefacec006babe <==> 0xcafefacec006babe
PASS: SPR 787:  0x00000000c0debabe <==> 0x00000000c0debabe
PASS: SPR 788:  0x00000000c0debabe <==> 0x00000000c0debabe
PASS: SPR 789:  0x00000000c0debabe <==> 0x00000000c0debabe
PASS: SPR 790:  0x00000000c0debabe <==> 0x00000000c0debabe
PASS: SPR 791:  0x00000000c0debabe <==> 0x00000000c0debabe
PASS: SPR 792:  0x00000000c0debabe <==> 0x00000000c0debabe
PASS: SPR 795:  0x00000000fa8b1afe <==> 0x00000000fa8b1afe
PASS: SPR 796:  0xcafefacec0debabc <==> 0xcafefacec0debabc
PASS: SPR 797:  0xcafefacec0debabe <==> 0xcafefacec0debabe
PASS: SPR 798:  0xcafefacec0debabe <==> 0xcafefacec0debabe
PASS: SPR 800:  0x80000000c0000000 <==> 0x80000000c0000000
PASS: SPR 801:  0x0000000080000000 <==> 0x0000000080000000
PASS: SPR 802:  0x80000000c0000000 <==> 0x80000000c0000000
PASS: SPR 803:  0x0000000080000000 <==> 0x0000000080000000
PASS: SPR 804:  0xcafefacec0debabe <==> 0xcafefacec0debabe
PASS: SPR 805:  0xcafefacec0debabc <==> 0xcafefacec0debabc
PASS: SPR 806:  0x80000000c0000000 <==> 0x80000000c0000000
PASS: SPR 815:  0xcafefacec0debabe <==> 0xcafefacec0debabe
SUMMARY: 47 tests

EXIT: STATUS=1

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https://bugs.launchpad.net/bugs/1723904

Title:
  ubuntu-kvm-unit test failed with sprs test on ppc64le

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