Tested with QEMU 2.10.0 from upstream, this issue still exist.
Tested with kvm_unit_test from upstream, this issue has gone with QEMU 2.5.0

$ sudo ./arm/run arm/selftest.flat -smp 2 -m 256 -append 'setup smp=2 mem=256'
/usr/bin/qemu-system-aarch64 -nodefaults -machine 
virt,gic-version=host,accel=kvm -cpu host -device virtio-serial-device -device 
virtconsole,chardev=ctd -chardev testdev,id=ctd -device pci-testdev -display 
none -serial stdio -kernel arm/selftest.flat -smp 2 -m 256 -append setup smp=2 
mem=256 # -initrd /tmp/tmp.NRvKU9inc7
PASS: selftest: setup: smp: nr_cpus = 2
PASS: selftest: setup: mem: size = 256 MB
SUMMARY: 2 tests

I will update the kvm_unit_test in our repo.

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Po-Hsu Lin (cypressyew)

** Changed in: linux (Ubuntu)
       Status: Confirmed => In Progress

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https://bugs.launchpad.net/bugs/1715611

Title:
  kvm_unit_test failed on ThunderX but passed on Moonshot ARM64

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