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GetVmlatency.ps1
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<#
.SYNOPSIS
Build vmlatency driver and measure VM-Entry and VM-Exit turnaroound time.
.DESCRIPTION
This scripts builds vmlatency driver and measures VM-Entry and VM-Exit
turnaroound time in cycles.
.PARAMETER Command
Supported commands:
"build" Build vmlatency kernel driver.
"measure" Default. Build vmatency kernel driver and measure VM-Entry and
VM-Exit turnaround time.
"set-testsigning" Switch current host to test mode and create self-signed
certificate.
"clean-testsigning" Revert changes made by "set-testsigning" command.
#>
Param (
[ValidateSet("build", "measure", "set-testsigning",
"clean-testsigning")][String]$Command = "measure",
[Switch]$UseICC=$False
)
$VmlatencyRoot = Split-Path -Parent -Path $Script:MyInvocation.MyCommand.Definition
$WDKRoot = "C:\WinDDK\7600.16385.1"
$CertificateSubject = "VmlatencyTestCertificate"
Function Build([String]$Component) {
Echo "Building Vmlatency ($Component)"
$Cmds = "/C"
$Cmds += " $WDKRoot\bin\setenv.bat $WDKRoot fre x64 WIN7"
If ($Script:ICCPath) {
$Cmds += " & set SUBSTITUTE_AMD64_CC=`"$Script:ICCPath`""
# Disable Inter-Procedural Optimization (IPO). Windows linker does not
# support link time optimizable objects produced with this optimization
$Cmds += " & set USER_C_FLAGS=/Qipo-"
}
$Cmds += " & cd /d $VmlatencyRoot\$Component"
$Cmds += " & build /cfFgwb"
$P = (Start-Process cmd -ArgumentList $Cmds -Wait -NoNewWindow -PassThru)
If (-Not $P.ExitCode -Eq 0) {
Echo "*** Failed to build Vmlatency ($Component)"
Exit 1
}
}
Function Setup-EventLog([String]$Driver) {
$Xreg = 'HKLM:SYSTEM\CurrentControlSet\Services\EventLog\System\vmlatency'
$Param = @{
'Path' = $Xreg
'ErrorAction' = 'SilentlyContinue'
}
If (-Not (Get-Item @Param)) {
$Param = @{
'Path' = 'HKLM:\SYSTEM\CurrentControlSet\Services\EventLog\System'
'name' = 'vmlatency'
}
New-Item @Param > $null
}
$Param = @{
'Path' = $Xreg
'Name' = 'EventMessageFile'
'PropertyType' = 'String'
'Value' = $Driver
'ErrorAction' = 'SilentlyContinue'
}
New-ItemProperty @Param > $null
$Param = @{
'Path' = $Xreg
'Name' = 'TypesSupported'
'PropertyType' = 'Dword'
'Value' = 0x00000007
'ErrorAction' = 'SilentlyContinue'
}
New-ItemProperty @Param > $null
}
Function Load-Vmlatency() {
$Driver = "$VmlatencyRoot\build-win7-fre\amd64\vmlatency.sys"
Setup-EventLog $Driver
# It's impossible to create kernel service using New-Service cmdlet
$ScArgs = "create vmlatency binPath=$Driver type=kernel"
$P = (Start-Process sc.exe -ArgumentList $ScArgs -Wait -NoNewWindow -PassThru)
If (-Not $P.ExitCode -Eq 0) {
Echo "*** Failed to create vmatency service"
Exit 1
}
$Vmlatency = Get-Service vmlatency
try {
$Vmlatency.Start()
} catch {
Echo "*** Failed to start vmlatency service"
Echo "*** Look at system logs for more information"
Unload-Vmlatency
Exit 1
}
}
Function Unload-Vmlatency() {
$Vmlatency = Get-Service vmlatency -ErrorAction SilentlyContinue
If (-Not $Vmlatency) { Return }
If ($Vmlatency.Status -eq 'Running') { $Vmlatency.Stop() }
# Remove-Service cmdlet is available starting with PowerShell 6.0
$ScArgs = "delete vmlatency"
$P = (Start-Process sc.exe -ArgumentList $ScArgs -Wait -NoNewWindow -PassThru)
If (-Not $P.ExitCode -Eq 0) {
Echo "*** Failed to delete vmlatency service"
Exit 1
}
$Param = @{
'Path' = 'HKLM:SYSTEM\CurrentControlSet\Services\EventLog\System\vmlatency'
'ErrorAction' = 'SilentlyContinue'
}
Remove-Item @Param > $null
}
Function SetupBuildEnvironment() {
If (-Not (Test-Path $WDKRoot)) {
Echo "*** Windows Driver Kit Version 7 is not found"
Exit 1
}
Echo "Using WDK='$WDKRoot'"
If ($UseICC) {
ForEach ($ICC in Get-Item Env:ICPP_COMPILER*) {
If ($LatestICC.name -lt $ICC.name) { $LatestICC = $ICC }
}
If (-Not $LatestICC) {
Echo "ICC not found"
Exit 1
}
$Script:ICCPath = $LatestICC.value + "\bin\intel64\icl.exe"
Echo "Using ICC='$Script:ICCPath'"
}
}
Function Sign([String]$File) {
$SignTool = "$WDKRoot\bin\amd64\SignTool.exe"
$Args = " sign /t http://timestamp.digicert.com"
$Args += " /n $CertificateSubject"
$Args += " $File"
Echo "Signing $File"
$P = (Start-Process $SignTool -ArgumentList $Args -NoNewWindow -PassThru)
$P.WaitForExit()
If ($P.ExitCode -Eq 1) {
Echo "*** Failed to sign $File"
Exit 1
}
}
Function SetupSelfSigning() {
Foreach ($c in (Get-ChildItem -Path "Cert:\CurrentUser\My")) {
If ($c.Subject -Eq "CN=$CertificateSubject") {
$t = $c.Thumbprint;
Break
}
}
If ($t) {
Echo "Self-signed certificate for vmlatency $t already exists."
} Else {
$Param = @{
'CertStoreLocation' = "Cert:\CurrentUser\My"
'Subject' = "CN=$CertificateSubject"
'Type' = "CodeSigningCert"
}
$c = New-SelfSignedCertificate @Param
If (-Not $c) {
Echo "Failed to create self-signed certificate."
Exit 1
}
Echo ("Self-signed certificate " + $c.Thumbprint + " created.")
}
SetTestsigning "ON"
}
Function CleanupSelfSigning() {
SetTestsigning "OFF"
Foreach ($c in (Get-ChildItem -Path "Cert:\" -Recurse)) {
If ($c.Subject -Eq "CN=VmlatencyTestCertificate") { Rm $c.PsPath }
}
}
Function SetTestsigning($Value) {
$CheckTestSigningCmd = "bcdedit.exe /v | Select-String testsigning"
$CheckTestSigningCmd += " | Select-String Yes"
$SetTestSigningCmd = "bcdedit.exe /set testsigning $Value"
$ExitUnchanged = 104
$ExitReboot = 1077
$Change = "{ $SetTestSigningCmd; Exit $ExitReboot }"
$AlreadySet = "{ Exit $ExitUnchanged }"
If ($Value -Eq "ON") {
$Cmd = "If ($CheckTestSigningCmd) $AlreadySet Else $Change"
} ElseIf ($Value -Eq "OFF") {
$Cmd = "If ($CheckTestSigningCmd) $Change Else $AlreadySet"
} Else {
Echo "Unsupported testsigning value $Value."
Exit 1
}
$Param = @{
'Verb' = 'runAs'
'ArgumentList' = "$Cmd"
'WindowStyle' = 'Hidden'
}
$p = (Start-Process powershell @Param -PassThru)
$p.WaitForExit()
If (-Not $p){
Echo "Failed to elevate"
Exit 0
}
If ($p.ExitCode -Eq $ExitUnchanged) {
Echo "Testsigning mode is already $Value."
} ElseIf ($p.ExitCode -Eq $ExitReboot) {
Echo "Testsigning mode changed to $Value."
Echo "Reboot is required for the changes to take effect."
} Else {
Echo ("Failed to set testsigning to $Value. ExitCode: " + $p.ExitCode)
Exit 1
}
}
Function Dump-Results([System.DateTime]$StartTime) {
$CPUName = @(Get-WmiObject win32_processor)[0].name
$L = (Get-EventLog -LogName System -Message *vmlatency]* -After $StartTime)
[Array]::Reverse($L)
$Data = $L.Message.Replace("[vmlatency] ", "").Replace("`n", "")
Set-Content -Path ($CPUName + ".txt") -Value $Data
}
Switch ($Command) {
"set-testsigning" { SetupSelfSigning }
"clean-testsigning" { CleanupSelfSigning }
Default {
SetupBuildEnvironment
Build vmm
Build win
If ($Command -Eq "measure") {
Sign "$VmlatencyRoot\build-win7-fre\amd64\vmlatency.sys"
$StartTime = Get-Date
Load-Vmlatency
Dump-Results $StartTime
Unload-Vmlatency
}
}
}