I still have the same issue with kernel 3.16.0-36-generic or 3.13.0-51-generic (proposed-updates)

# KVM HOST (3.16.0-36-generic)
sudo apt-get install linux-signed-generic-lts-utopic/trusty-proposed

# KVM GUEST (3.16.0-36-generic)
sudo apt-get install linux-virtual-lts-utopic/trusty-proposed
apt-get install cloud-installer
cloud-install

[ 1196.920613] kvm: vmptrld           (null)/780000000000 failed
[ 1196.920953] vmwrite error: reg 401e value 31 (err 1)
[ 1196.921243] CPU: 23 PID: 5240 Comm: qemu-system-x86 Not tainted 3.16.0-36-generic #48~14.04.1-Ubuntu
[ 1196.921244] Hardware name: HP ProLiant DL380 Gen9, BIOS P89 11/03/2014
[ 1196.921245]  0000000000000000 ffff88202018fb58 ffffffff81764a5f ffff880fe4960000
[ 1196.921248]  ffff88202018fb68 ffffffffc0a9320d ffff88202018fb78 ffffffffc0a878bf
[ 1196.921250]  ffff88202018fba8 ffffffffc0a8e1cf ffff880fe4960000 0000000000000000
[ 1196.921252] Call Trace:
[ 1196.921262]  [<ffffffff81764a5f>] dump_stack+0x45/0x56
[ 1196.921277]  [<ffffffffc0a9320d>] vmwrite_error+0x2c/0x2e [kvm_intel]
[ 1196.921280]  [<ffffffffc0a878bf>] vmcs_writel+0x1f/0x30 [kvm_intel]
[ 1196.921283]  [<ffffffffc0a8e1cf>] free_nested.part.73+0x5f/0x170 [kvm_intel]
[ 1196.921286]  [<ffffffffc0a8e363>] vmx_free_vcpu+0x33/0x70 [kvm_intel]
[ 1196.921305]  [<ffffffffc03fd774>] kvm_arch_vcpu_free+0x44/0x50 [kvm]
[ 1196.921312]  [<ffffffffc03fe3e2>] kvm_arch_destroy_vm+0xf2/0x1f0 [kvm]
[ 1196.921318]  [<ffffffff810d28ed>] ? synchronize_srcu+0x1d/0x20
[ 1196.921323]  [<ffffffffc03e635e>] kvm_put_kvm+0x10e/0x220 [kvm]
[ 1196.921328]  [<ffffffffc03e64a8>] kvm_vcpu_release+0x18/0x20 [kvm]
[ 1196.921331]  [<ffffffff811d5e64>] __fput+0xe4/0x220
[ 1196.921333]  [<ffffffff811d5fee>] ____fput+0xe/0x10
[ 1196.921337]  [<ffffffff8108e284>] task_work_run+0xc4/0xe0
[ 1196.921342]  [<ffffffff810702c8>] do_exit+0x2b8/0xa60
[ 1196.921345]  [<ffffffff810e3792>] ? __unqueue_futex+0x32/0x70
[ 1196.921347]  [<ffffffff810e47b6>] ? futex_wait+0x126/0x290
[ 1196.921349]  [<ffffffff8109eb35>] ? check_preempt_curr+0x85/0xa0
[ 1196.921351]  [<ffffffff81070aef>] do_group_exit+0x3f/0xa0
[ 1196.921353]  [<ffffffff81080530>] get_signal_to_deliver+0x1d0/0x6f0
[ 1196.921357]  [<ffffffff81012548>] do_signal+0x48/0xad0
[ 1196.921359]  [<ffffffff81011627>] ? __switch_to+0x167/0x590
[ 1196.921361]  [<ffffffff81013039>] do_notify_resume+0x69/0xb0
[ 1196.921364]  [<ffffffff8176d44a>] int_signal+0x12/0x17
[ 1196.921365] vmwrite error: reg 2800 value ffffffffffffffff (err -255)
[ 1196.921733] CPU: 23 PID: 5240 Comm: qemu-system-x86 Not tainted 3.16.0-36-generic #48~14.04.1-Ubuntu
[ 1196.921734] Hardware name: HP ProLiant DL380 Gen9, BIOS P89 11/03/2014
[ 1196.921735]  0000000000000000 ffff88202018fb58 ffffffff81764a5f ffff880fe4960000
[ 1196.921736]  ffff88202018fb68 ffffffffc0a9320d ffff88202018fb78 ffffffffc0a878bf
[ 1196.921737]  ffff88202018fba8 ffffffffc0a8e1e0 ffff880fe4960000 0000000000000000
[ 1196.921739] Call Trace:
[ 1196.921741]  [<ffffffff81764a5f>] dump_stack+0x45/0x56
[ 1196.921744]  [<ffffffffc0a9320d>] vmwrite_error+0x2c/0x2e [kvm_intel]
[ 1196.921746]  [<ffffffffc0a878bf>] vmcs_writel+0x1f/0x30 [kvm_intel]
[ 1196.921748]  [<ffffffffc0a8e1e0>] free_nested.part.73+0x70/0x170 [kvm_intel]
[ 1196.921751]  [<ffffffffc0a8e363>] vmx_free_vcpu+0x33/0x70 [kvm_intel]
[ 1196.921757]  [<ffffffffc03fd774>] kvm_arch_vcpu_free+0x44/0x50 [kvm]
[ 1196.921763]  [<ffffffffc03fe3e2>] kvm_arch_destroy_vm+0xf2/0x1f0 [kvm]
[ 1196.921765]  [<ffffffff810d28ed>] ? synchronize_srcu+0x1d/0x20
[ 1196.921770]  [<ffffffffc03e635e>] kvm_put_kvm+0x10e/0x220 [kvm]
[ 1196.921774]  [<ffffffffc03e64a8>] kvm_vcpu_release+0x18/0x20 [kvm]
[ 1196.921775]  [<ffffffff811d5e64>] __fput+0xe4/0x220
[ 1196.921777]  [<ffffffff811d5fee>] ____fput+0xe/0x10
[ 1196.921778]  [<ffffffff8108e284>] task_work_run+0xc4/0xe0
[ 1196.921780]  [<ffffffff810702c8>] do_exit+0x2b8/0xa60
[ 1196.921782]  [<ffffffff810e3792>] ? __unqueue_futex+0x32/0x70
[ 1196.921783]  [<ffffffff810e47b6>] ? futex_wait+0x126/0x290
[ 1196.921784]  [<ffffffff8109eb35>] ? check_preempt_curr+0x85/0xa0
[ 1196.921786]  [<ffffffff81070aef>] do_group_exit+0x3f/0xa0
[ 1196.921788]  [<ffffffff81080530>] get_signal_to_deliver+0x1d0/0x6f0
[ 1196.921790]  [<ffffffff81012548>] do_signal+0x48/0xad0
[ 1196.921791]  [<ffffffff81011627>] ? __switch_to+0x167/0x590
[ 1196.921793]  [<ffffffff81013039>] do_notify_resume+0x69/0xb0
[ 1196.921795]  [<ffffffff8176d44a>] int_signal+0x12/0x17
[ 1270.766540] device vnet3 entered promiscuous mode
[ 1270.865885] device vnet4 entered promiscuous mode
[ 1273.824576] kvm: zapping shadow pages for mmio generation wraparound
[ 1447.725335] kvm [6152]: vcpu0 unhandled rdmsr: 0x606

uvt-kvm create \
--memory 16384 \
--disk 100 \
--cpu 2 \
--ssh-public-key-file uvt-authorized_keys \
--template uvt-template.xml \
test release=trusty arch=amd64

....
  <vcpu placement='static'>2</vcpu>
  <cputune>
    <vcpupin vcpu='0' cpuset='23'/>
    <vcpupin vcpu='1' cpuset='31'/>
    <emulatorpin cpuset='23,31'/>
  </cputune>
  <cpu mode='custom' match='exact'>
    <model fallback='allow'>SandyBridge</model>
    <vendor>Intel</vendor>
    <topology sockets='1' cores='2' threads='1'/>
    <feature policy='require' name='vmx'/>
....