OPERATIONAL DEFECT DATABASE
...
...
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 descriptionPCI: ssss: Not a ACS capable device
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.
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.
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 hostLocation of log files for VMware productsVMware ESX 4.1, Patch ESX410-201101201-SG: Updates ESX 4.1 Core and CIM components, krb5, openldap, and pam-krb5VMware ESXi 4.1, Patch ESXi410-201101201-SG: Updates ESXi 4.1 FirmwarevSphere 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
Click on a version to see all relevant bugs
VMware Integration
Learn more about where this data comes from
Bug Scrub Advisor
Streamline upgrades with automated vendor bug scrubs
BugZero Enterprise
Wish you caught this bug sooner? Get proactive today.
