Specify the location path and the name of the VM. The final step is to tell Hyper-V that a VM should have access to the device. If a mitigation driver wasn't installed, use the following cmdlet: Dismount-VMHostAssignableDevice -Force -LocationPath $locationPath If a mitigation driver was installed, use the following cmdlet: Dismount-VMHostAssignableDevice -LocationPath $locationPath Dismount the deviceĭepending on whether the vendor provided a mitigation driver, you must either use the -Force option or not, as shown here: Use Device Manager or PowerShell to ensure the device is Disabled. For more information about locating the location path, see Plan for Deploying Devices using Discrete Device Assignment. The PCI location path is required to dismount and mount the device from the host. For more information about the security implications, see Plan for Deploying Devices using Discrete Device Assignment. If no partitioning driver is provided, during dismount you must use the -Force option to bypass the security warning. Reach out to the hardware vendor to see if they have a mitigation driver. But if they do provide a driver, install it prior to dismounting the device from the host partition. It's up to the hardware vendor's discretion to provide this driver. This driver isn't the same as the device driver installed in the guest VM. Install the partitioning driver (optional)ĭDA gives hardware vendors the ability to provide a security mitigation driver with their devices. For more information about how to precisely calculate MMIO requirements, see Plan for Deploying Devices using Discrete Device Assignment.ĭismount the device from the host partitionįollow the instructions in this section to dismount the device from the host partition. If after starting the VM the device is reporting an error relating to not enough resources, you'll likely need to modify these values. The MMIO space values shown are reasonable values to set for experimenting with a single GPU. For more information, see Plan for Deploying Devices using Discrete Device Assignment and on this blog post.Įnable Write-Combining on the CPU by using the following cmdlet: Set-VM -GuestControlledCacheTypes $true -VMName VMNameĬonfigure the 32-bit MMIO space by using the following cmdlet: Set-VM -LowMemoryMappedIoSpace 3Gb -VMName VMNameĬonfigure greater than 32-bit MMIO space by using the following cmdlet: Set-VM -HighMemoryMappedIoSpace 33280Mb -VMName VMName For details on whether you need the following configurations for your hardware, reach out to the hardware vendor. Some hardware performs better if the VM in configured in a certain way. Configure the Automatic Stop Action of a VM to enable TurnOff with the following PowerShell cmdlet: Set-VM -Name VMName -AutomaticStopAction TurnOff The first step in the solution is to address DDA restrictions to the VMs. You can execute all commands on the host on a Windows PowerShell console as an administrator. Dismount the device from the host partition.There are three steps to using a device with DDA: Though not required, if Single Root I/O Virtualization (SR-IOV) isn't enabled or supported, you might encounter issues when you use DDA to deploy graphics devices.
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