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Knowledge Base

PCI Passthrough with PCIe devices behind a non-ACS switch in vSphere (1036811)

Last Updated: 2/15/2016Categories: InformationalTotal Views: 47586Language:
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Symptoms

After a reboot, PCIe devices still report Reboot Required on the Configuration tab of the Hardware - Advanced Settings section in the vSphere Client.

Attempting to add a PCI Device to a virtual machine cannot be completed, as no PCI Devices are listed as available for passthrough.

During startup, the VMkernel logs report a warning regarding a specific PCIe device similar to:

WARNING: PCI: ssss: nnn:nnn:nn.n: Cannot change ownership to PASSTHRU (non-ACS capable switch in hierarchy)

During startup, the VMkernel logs reports whether a given PCIe device supports Access Control Services (ACS). You see the message similar to:

PCI: ssss: nnn:nnn:nn.n: PCIe description
PCI: ssss: Not a ACS capable device

Cause

Access Control Services (ACS) was introduced by the PCI-SIG to address potential data corruption with direct assignment of devices. Passthrough of a PCIe device to a virtual machine, using DirectPath I/O, is disallowed by the VMKernel if the device is connected to a switch port or root port that does not support Access Control Services.

Resolution

VMKernel support for ACS was introduced in these updates and patch releases:

VMware ESXi 4.1 patch ESXi410-201101201-SG.

For more information, see VMware ESXi 4.1, Patch ESXi410-201101201-SG: Updates ESXi 4.1 Firmware (1027919).

VMware ESX 4.1, Patch ESX410-201101201-SG.

For more information, see VMware ESX 4.1, Patch ESX410-201101201-SG: Updates ESX 4.1 Core and CIM components, krb5, openldap, and pam-krb5 (1027904).

VMware ESXi 4.1 Update 1. For more information, see the release notes.

VMware ESX 4.1 Update 1. For more information, see the release notes.

Note: Prior releases of VMware ESX/ESXi 4.x did not enforce this validation. Do not use passthrough for PCIe devices behind a PCIe switch without ACS capability.

For more information, see PCI-SIG SR-IOV Primer: An Introduction to SR-IOV Technology.

Note: The preceding link was correct as of February 10, 2016. If you find a link is broken, provide the feedback and a VMware employee will update the link.

Related Information

For information about VMDirectPath I/O requirements, see VMware vSphere VMDirectPath I/O: Requirements for Platforms and Devices (2142307).

Configuring VMDirectPath I/O pass-through devices on a VMware ESX or VMware ESXi host
Location of log files for VMware products
VMware ESX 4.1, Patch ESX410-201101201-SG: Updates ESX 4.1 Core and CIM components, krb5, openldap, and pam-krb5
VMware ESXi 4.1, Patch ESXi410-201101201-SG: Updates ESXi 4.1 Firmware
vSphere での非 ACS スイッチの背後にある PCIe デバイスを使用した PCI パススルー
vSphere 中非 ACS 交换机后有 PCIe 设备的 PCI 直通
VMware vSphere VMDirectPath I/O: Requirements for Platforms and Devices

Detectable by VMware SkylineTM

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Additional Resources

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仮想マシンを vSphere 環境から VMware Workstation にエクスポートすると次のエラーで失敗する：セッションに必要な権限がありません (2144705)

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End Of General Availability of the Free vSphere Hypervisor (ESXi 7.x and 8.x) (2107518)

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使用 vSphere Client 在 ESX/ESXi 主机上配置网络时间协议 (NTP) (2012069)

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Download and Install VMware Fusion (2014097)

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