Some customers found that on upgrading GRID 3.0 they encountered vGPU unavailable within vCenter where previously by luck MMIO holes were avoided. Server BIOS configurationĬustomers experiencing errors associated with MMIO and PCI I/O allocation should consult their server vendor for advice on how best to configure the BIOS to fit the constraints of MMIO region access on their particular server given the constraints of the specific version of the hypervisor they have chosen. vSphere/ESXi 5.1.x is limited to 4GB for MXPA and so decoding above 4G should be disabled.the Maximum Physical Address (MAXPA) is limited to 16TB in versions 6.0, 16TB (44-bit, 2 to the power of 44).This KB article from VMware outlines the limits on MMIO access for PCI devices. BIOS settings need to ensure PCI addressing for NVIDIA GRID GPUs is below the 44-bit limit. The current version of ESXi / vSphere (6.0 including up to 6.0 Update 2) and below are limited for vGPU PCI devices to 44-bit addressing, although ESXi is a 64-bit hypervisor. Known Configurations where care is needed - VMware ESXi / vSphere (32-bit addressing corresponds to a 4G limit, see wikipedia). Further information is available from Citrix. 64-bit MMIO, Memory Hole for PCI MMIO, Above 4G Decoding). As such versions of XenServer earlier than XS6.5 must be run on Servers with MMIO mapping above 4G disabled (various servers call name these BIOS option differently e.g.
Known Configurations where care is needed - Citrix XenServerĪll versions of Citrix XenServer prior to XS6.5 were a 32-bit hypervisor XS6.5 was Citrix's first 64-bit hypervisor. Many other misconfigurations could cause similar issues. Sometimes mis-configuration may only be noticed on upgrade as by luck MMIO memory holes have been avoided by chance."This PCI I/O region assigned to your NVIDIA device is invalid" The hypervisor command, "dmesg | grep NVIDIA".vGPU profiles are not available in vCenter / XenCenter.Many other configuration errors can cause this to happen too, so further investigation is advised. nvidia-smi calls nvidia-smi Failed to initialize NVML: Unknown Error.If the BIOS settings are incompatible with the hypervisor support for MMIO addressing, MMIO support issues recognizing GPUs can occur.
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