This script checks if the iovDisableIR setting is set to FALSE. If not, it will set iovDisableIR to FALSE.

Fix-iovDisableIRSetting.ps1

<#
        .SYNOPSIS
        This script checks if the iovDisableIR setting is set to FALSE. If not, it will set iovDisableIR to FALSE.

        .DESCRIPTION
        The script checks the current setting of the Intel IOMMU interrupt remapper (iovDisableIR) and changes the setting
        if necessary.

        The script needs a single parameter: 
        
        - vSphere Cluster

        History  
        v1.0: First Release
     
        .EXAMPLE
        Fix-iovDisableIRSetting -Cluster LAB
    
        .NOTES
        Author: Patrick Terlisten, patrick@blazilla.de, Twitter @PTerlisten
    
        This script is provided 'AS IS' with no warranty expressed or implied. Run at your own risk.

        This work is licensed under a Creative Commons Attribution NonCommercial ShareAlike 4.0
        International License (https://creativecommons.org/licenses/by-nc-sa/4.0/).

        ESXi hosts running ESXi 5.5 Patch 10, 6.0 Patch 4, 6.0 U3, or 6.5 may fail with a purple diagnostic screen
        caused by non-maskable-interrupts (NMI) on HPE ProLiant Gen8 Servers.

        Important vendor links:

        ESXi host fails with intermittent NMI PSOD on HP ProLiant Gen8 servers (2149043)
        https://kb.vmware.com/kb/2149043

        Advisory: (Revision) VMware - HPE ProLiant Gen8 Servers running VMware ESXi 5.5 Patch 10, VMware ESXi 6.0 Patch 4,
        or VMware ESXi 6.5 May Experience Purple Screen Of Death (PSOD): LINT1 Motherboard Interrupt
        http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c05392947

        .LINK
        http://www.vcloudnine.de
#>

#Requires -Version 3.0
#Requires -Module VMware.VimAutomation.Core

# Parameter

Param (
    [Parameter(Mandatory = $true)]
    [string]$cluster = "Name of the vSphere Cluster"
)

# Get the ESXi hosts from the given cluster

$Hosts = Get-Cluster $cluster | Get-VMhost

# Create an empty array for the PowerShell object

$Results = @()

# Looping through the VMHosts

$Hosts | ForEach-Object {

    $EsxCliv2 = Get-EsxCli -V2 -VMHost $_
    $Arguments = $EsxCliv2.system.settings.kernel.list.CreateArgs()
    $Arguments.option = "iovDisableIR"
    $Output = $EsxCliv2.system.settings.kernel.list.Invoke($Arguments)

    # Get the vendor and model of the current VMHost

    $Model = $_ | Get-View | Select-Object @{N = 'Model'; E = {$_.Hardware.SystemInfo.Vendor + ' ' + $_.Hardware.SystemInfo.Model}}

    # Properties for the PowerShell object

    $PSOProps = @{
 
        VMHost = $_.name
        Model = $Model.Model
        
        # The value of "Runtime" represents the current active mode of iovDisableIR
        
        iovDisableIR = $Output.Runtime
 
    }

    $Results += New-Object -TypeName psobject -Property $PSOProps
}

# Getting a list of the affected hosts by filtering the output for iovDisableIR = TRUE and server models with "Gen8"

$AffectedHosts = $Results | Where-Object {$_.iovDisableIR -eq 'TRUE' -and $_.Model -like '*Gen8'} | Select-Object VMhost

$Count = ($AffectedHosts).Count

If ($Count -gt 0) {
    
    Write-host `n
    Write-Host -ForegroundColor Red "The following hosts are affected."
        
    $AffectedHosts | Format-Table

}

else {

    Write-host `n
    Write-Host -ForegroundColor Green "None of your hosts seeems to be affected."
    Write-host `n
    break

}

# Change the iovDisableIR

Write-Host -ForegroundColor Green "Setting iovDisableIR to FALSE."

$AffectedHosts.VMhost | ForEach-Object {

    # Current host

    Write-host `n
    Write-Host -ForegroundColor Green "Processing host $_."

    try {
        
        # Change iovDisableIR

        $EsxCliv2 = Get-EsxCli -V2 -VMHost $_
        $Arguments = $EsxCliv2.system.settings.kernel.set.CreateArgs()
        $arguments.setting = "iovDisableIR"
        $arguments.value = $false
        $EsxCliv2.system.settings.kernel.set.Invoke($Arguments)
    }
    
    catch {
        
        Write-Host -ForegroundColor Red "Ups... something with $_ went wrong."

    }
    
    Write-Host -ForegroundColor Green "Finished processing host $_."
    
}

Write-host `n
Write-Host -ForegroundColor Green "Script finished. Please reboot each host."