HBA passthrough

[cheezehead]

Testing out the Hyper-V role within Server 2022 in the lab, with it I've got a pair of storage spaces mirrored SSDs for VM storage but I'm looking to pass-through a SAS2008 device to a VM and hitting a wall.

---------------------------------------------------------------------
$pnpdevs = Get-PnpDevice | where {($_.Class -eq "SCSIAdapter") -and ($_.FriendlyName -like "LSI*")}
Disable-PnpDevice -InstanceId $pnpdevs.PNPDeviceID

Set-VM -HighMemoryMappedIoSpace 6Gb -VMName $myvm
Set-VM -GuestControlledCacheTypes $true -VMName $myvm

Add-VMAssignableDevice -LocationPath "PCIROOT(0)#PCI(0300)#PCI(0000)" -VMName $myvm
-------------------------------------------------------------------

Add-VMAssignableDevice : The specified device 'PCIROOT(0)#PCI(0300)#PCI(0000)' was not found on server 'hyper-1'.
At line:1 char:1
+ Add-VMAssignableDevice -LocationPath "PCIROOT(0)#PCI(0300)#PCI(0000)" ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: ) [Add-VMAssignableDevice], VirtualizationException
+ FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.AddVmAssignableDevice

Is this even possible within Hyper-V?

 

[cheezehead]

Tested on Server 2025 as well but to answer the question, no it's not possible.

Hyper-V can handle GPU, individual hard disk pass through, and network adapters but not storage controllers.

An old but length write-up on the process can be found at: Passing through devices to Hyper-V VMs by using discrete device assignment - Scripting Blog [archived]

 

[pricklypunter]

I think this issue alone drove a bazillion customers straight into the waiting arms of VMWare. M$, if nothing else, are consistent at shooting themselves in the foot

 

[cheezehead]

I think this issue alone drove a bazillion customers straight into the waiting arms of VMWare. M$, if nothing else, are consistent at shooting themselves in the foot

Aware it's an edge case issue. In a business setting I wouldn't be running it but in test labs, that's another story. For some, to get the M$ adoption at a business...it starts with home labs.

 

[kathampy]

Hyper-V can passthrough only devices that support Message-Signaled Interrupts. Newer storage controllers do work in Hyper-V. ESXi supports older ones.