VMware KB: PCI Passthrough with PCIe devices behind a non

冬木*细雪 2014-11-25

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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 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 the Access Control Services (ACS) section of the Intel PCI-SIG SR-IOV Primer at http://www.intel.com/content/www/us/en/pci-express/pci-sig-sr-iov-primer-sr-iov-technology-paper.html.

Note: The preceding link was correct as of August 18, 2011. If you find a link is broken, provide feedback and a VMware employee will update the link.

VMware KB: PCI Passthrough with PCIe devices behind a non

Cause

Resolution

See Also