5.5_enable_softResetClearTSC_onVM.ps1

<# 
.SYNOPSIS 
    Windows 8 and Windows 2012 Server or later virtual machines fail upon reboot (2092807)
    https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2092807
    
    Resolution: To _work around_ this issue, update the VM advanced configuration to add monitor_control.enable_softResetClearTSC = TRUE

.NOTES 
   Author     : Ludovic Rivallain
   Version    : 1.0
#>

Param(
  [Parameter(Mandatory=$True)]$VCServer,    # The vCenter hostname
  [Parameter(Mandatory=$True)]$VCUser,      # The vCenter username to connect
  [Parameter(Mandatory=$True)]$VCPassword,  # The vCenter password to connect
  [Parameter(Mandatory=$True)]$SleepTime,   # A sleep duration to wait between two new migration tasks
  [Parameter(Mandatory=$False)]$VMName      # A VM name to filter on (for test runs)
)

# Import PowerCLI commands
If (-not (Get-PSSnapin VMware.VimAutomation.Core -ErrorAction SilentlyContinue))
{   Try { Add-PSSnapin VMware.VimAutomation.Core -ErrorAction Stop }
    Catch { Write-host "Unable to load PowerCLI, is it installed?" -ForegroundColor Red; Exit }
}

# Connect to the vCenter
Try{
  Connect-VIServer $VCServer -User $VCUser -password $VCPassword -ErrorAction Stop | Out-Null
} Catch {
  Write-Host "Unable to connect to the server $VCServer" -ForegroundColor Red ;
  Exit
}


## new property for VMHost
New-VIProperty -ObjectType VMHost -Name MemoryFreeGB -Value {[math]::Round(($Args[0].MemoryTotalGB - $Args[0].MemoryUsageGB),2)} -Force | Out-Null

# If specified, filter VM on a specific VMName
[array]$vms = @()
if ($VMName) {
    [array]$vms = @(Get-VM | Where-Object { $_.Name -like "*$VMName*" })
} else {
    [array]$vms = @(Get-VM)
}
$count = $vms.Count
Write-Host "NB VM found with/without filter : $($vms.Count)"
Write-Host "Press enter to continue and CTRL-C to exit ..."
$x = $host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown")

# Loop on each VM of the result
ForEach ($vm in $vms) {
    $vmv = Get-VM $vm | Get-View
    $name = $vmv.Name
    Write-Host "Testing VM $name" 
    $guestid = $vmv.Summary.Config.GuestId
    $state = $vmv.Summary.Runtime.PowerState
    $vmx = New-Object VMware.Vim.VirtualMachineConfigSpec
    $vmx.extraConfig += New-Object VMware.Vim.OptionValue
    $vmx.extraConfig[0].key = "monitor_control.enable_softResetClearTSC"
    $vmx.extraConfig[0].value = "TRUE"
    if ($guestid -like "windows8*Guest") {
        Write-Host "--> Applying change on VM $name" 
        ($vmv).ReconfigVM_Task($vmx) | Out-Null
        if ($state -eq "poweredOn") {
            Write-Host "  --> As VM $name was poweredOn, migrate it to apply changes" 
            # find out the cluster of the VM
            $cluster = $vm.VMHost.Parent
            # find all other hosts of the cluster
            $otherhosts = Get-VMHost | Where-Object {($_.Name -ne $vm.VMHost.Name)}
            # get a new host based on free memory
            $targethost = $($otherhosts | Sort-Object -property MemoryFreeGB -Descending)[0]
            Write-Host "    --> VM will be migrated to host $($targethost.name) according to the free memory" 
            
            # migrate
            $vmv.MigrateVM_Task($null, $targethost.ExtensionData.MoRef, 'highPriority', $null) | Out-Null
            Write-Host "      --> Sleep for $SleepTime before migrating a new VM" 
            Start-Sleep -s $SleepTime
        }
    }
}