vmx_debug_control test in kvm-unit-test failed on E4v3 azure node with 4.13/4.14 kernel

[Po-Hsu Lin]

With Joshua's comment in bug 1719524: "Nested KVM can only be tried on instance sizes with nested Hypervisor support: Ev3 and Dv3.", although the instance name is E4v3 here but I can start a KVM on it.

Test vmx_debug_control test will fail on it.

Steps:
1. git clone --depth=1 https://git.kernel.org/pub/scm/virt/kvm/kvm-unit-tests.git
2. cd kvm-unit-tests; ./configure; make
3. Run the vmx_debug_control test as root:

# TESTNAME=vmx_debug_controls TIMEOUT=90s ACCEL= ./x86/run x86/vmx.flat -smp 1 -cpu host,+vmx -append debug_controls
timeout -k 1s --foreground 90s /usr/bin/qemu-system-x86_64 -nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -machine accel=kvm -kernel x86/vmx.flat -smp 1 -cpu host,+vmx -append debug_controls # -initrd /tmp/tmp.p6JuB1q1gZ
enabling apic

paging enabled
cr0 = 80010011
cr3 = 46b000
cr4 = 20

Test suite: debug controls
Non-early vmlaunch failure (reason=0x80000021, qual=0): invalid guest state

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.14.0-1004-azure-edge 4.14.0-1004.4
ProcVersionSignature: User Name 4.14.0-1004.4-username-edge 4.14.14
Uname: Linux 4.14.0-1004-azure-edge x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
Date: Thu Feb 8 06:22:36 2018
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-azure-edge
UpgradeStatus: No upgrade log present (probably fresh install)