qemu-system-aarch64: Unable to determine GIC version supported by host

I found this issue on a linux-hwe-edge arm64 Moonshot node.

With Xenial + 4.15 HWE Edge kernel, most of the tests in the kvm-unit-test will be skipped:
Running './run_tests.sh -v'
 SKIP selftest-setup (KVM acceleration is probably not supported)
 SKIP selftest-vectors-kernel (KVM acceleration is probably not supported)
 SKIP selftest-vectors-user (KVM acceleration is probably not supported)
 SKIP selftest-smp (KVM acceleration is probably not supported)
 SKIP pci-test (KVM acceleration is probably not supported)
 SKIP pmu (KVM acceleration is probably not supported)
 TESTNAME=gicv2-ipi TIMEOUT=90s ACCEL= ./arm/run arm/gic.flat -smp $((($MAX_SMP < 8)?$MAX_SMP:8)) -machine gic-version=2 -append 'ipi'
 FAIL gicv2-ipi (timeout; duration=90s)
 SKIP gicv3-ipi (qemu-system-aarch64: KVM is currently required for GICv3 emulation)
 TESTNAME=gicv2-active TIMEOUT=90s ACCEL= ./arm/run arm/gic.flat -smp $((($MAX_SMP < 8)?$MAX_SMP:8)) -machine gic-version=2 -append 'active'
 PASS gicv2-active (1 tests)
 SKIP gicv3-active (qemu-system-aarch64: KVM is currently required for GICv3 emulation)
 SKIP psci (KVM acceleration is probably not supported)
 SKIP timer (KVM acceleration is probably not supported)

But with Xenial + 4.13 HWE kernel, it's very different:
 Running './run_tests.sh -v'
 TESTNAME=selftest-setup TIMEOUT=90s ACCEL= ./arm/run arm/selftest.flat -smp 2 -m 256 -append 'setup smp=2 mem=256'
 PASS selftest-setup (2 tests)
 TESTNAME=selftest-vectors-kernel TIMEOUT=90s ACCEL= ./arm/run arm/selftest.flat -smp 1 -append 'vectors-kernel'
 PASS selftest-vectors-kernel (2 tests)
 TESTNAME=selftest-vectors-user TIMEOUT=90s ACCEL= ./arm/run arm/selftest.flat -smp 1 -append 'vectors-user'
 PASS selftest-vectors-user (2 tests)
 TESTNAME=selftest-smp TIMEOUT=90s ACCEL= ./arm/run arm/selftest.flat -smp $MAX_SMP -append 'smp'
 PASS selftest-smp (9 tests)
 TESTNAME=pci-test TIMEOUT=90s ACCEL= ./arm/run arm/pci-test.flat -smp 1
 PASS pci-test (1 tests)
 TESTNAME=pmu TIMEOUT=90s ACCEL= ./arm/run arm/pmu.flat -smp 1
 FAIL pmu (3 tests, 3 unexpected failures)
 TESTNAME=gicv2-ipi TIMEOUT=90s ACCEL= ./arm/run arm/gic.flat -smp $((($MAX_SMP < 8)?$MAX_SMP:8)) -machine gic-version=2 -append 'ipi'
 PASS gicv2-ipi (3 tests)
 SKIP gicv3-ipi (qemu-system-aarch64: Initialization of device kvm-arm-gicv3 failed: error creating in-kernel VGIC: No such device)
 TESTNAME=gicv2-active TIMEOUT=90s ACCEL= ./arm/run arm/gic.flat -smp $((($MAX_SMP < 8)?$MAX_SMP:8)) -machine gic-version=2 -append 'active'
 PASS gicv2-active (1 tests)
 SKIP gicv3-active (qemu-system-aarch64: Initialization of device kvm-arm-gicv3 failed: error creating in-kernel VGIC: No such device)
 TESTNAME=psci TIMEOUT=90s ACCEL= ./arm/run arm/psci.flat -smp $MAX_SMP
 PASS psci (4 tests)
 TESTNAME=timer TIMEOUT=2s ACCEL= ./arm/run arm/timer.flat -smp 1

If you run the command "TESTNAME=selftest-setup TIMEOUT=90s ACCEL= ./arm/run arm/selftest.flat -smp 2 -m 256 -append 'setup smp=2 mem=256'" with 4.15 HWE Edge kernel it will give you more detail:
$ sudo TESTNAME=selftest-setup TIMEOUT=90s ACCEL= ./arm/run arm/selftest.flat -smp 2 -m 256 -append 'setup smp=2 mem=256'
timeout -k 1s --foreground 90s /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.WHgJW7rhMI
qemu-system-aarch64: Unable to determine GIC version supported by host
KVM acceleration is probably not supported

It's a bit weird to see a passed test change into a skip one.

 qemu-system-arm 1:2.5+dfsg-5ubuntu10

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.15.0-13-generic 4.15.0-13.14~16.04.1
ProcVersionSignature: User Name 4.15.0-13.14~16.04.1-generic 4.15.10
Uname: Linux 4.15.0-13-generic aarch64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: arm64
Date: Fri Mar 30 03:22:36 2018
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-hwe-edge
UpgradeStatus: No upgrade log present (probably fresh install)