After doing a bunch of KVM PCI device assignment test according to: https://fedoraproject.org/wiki/Test_Day:2009-05-07_Virtualization_KVM_PCI_Device_Assignment I eventually got: e1000e 0000:00:19.0: PCI INT A disabled e1000e 0000:00:19.0: PCI INT A -> GSI 20 (level, low) -> IRQ 20 e1000e 0000:00:19.0: setting latency timer to 64 e1000e 0000:00:19.0: irq 29 for MSI/MSI-X 0000:00:19.0: eth0: (PCI Express:2.5GB/s:Width x1) 00:13:20:f5:f9:5a 0000:00:19.0: eth0: Intel(R) PRO/1000 Network Connection 0000:00:19.0: eth0: MAC: 6, PHY: 6, PBA No: ffffff-0ff IOMMU: no free domain ids Allocating domain for 0000:00:19.0 failed<3>0000:00:19.0: eth0: Unable to allocate memory for the transmit descriptor ring During the testing the device is regularly being unbound from and bound to the e1000e driver in the host. Are we forgetting to release a domain ID when unbinding the device?
Fixed by commit 3199aa6bc8766e17b8f60820c4f78d59c25fce0e ("intel-iommu: fix PCI device detach from virtual machine")? But the comment for that says it fails after being assigned once...
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle. Changing version to '11'. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
Okay, that fix is in 2.6.30. Hopefully this is fixed now, I haven't seen it since