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[Qemu-discuss] QEMU and e1000e / igb host devices PCI passthrough

From: Derek Piper
Subject: [Qemu-discuss] QEMU and e1000e / igb host devices PCI passthrough
Date: Fri, 18 Jul 2014 11:39:52 -0400
User-agent: KMail/1.13.7 (Linux/3.2.0-4-amd64; KDE/4.8.4; x86_64; ; )


        I am still having a problem with PCI passthrough for PCIe network 
I seem to have 'kind of' success with the e1000e based 82574L port. It seems 
to pass through okay.  

Both the host and the virtual machine are on kernel 3.14.10
Both boot with kernel option pcie_aspm=off

        If the virtual machine is shut down and then started up again, I get 
errors within the virtual machine like:

irq 44: nobody cared

eth1 reset adapter unexpectedly.

        I tried setting the virtual machine to have irqpoll=on and then boom, 
whole host had a kernel panic.

        The 82580 quad port card apparently uses the igb driver and it does not 
do well at all. Even on the initial start of the virtual machine (if an 82580 
interface is assigned to it) I get errors in the virtual machine and no 
network connectivity at all. Errors are igb detected tx unit hang. They loop 
and continue.

        Any hints?


Derek Piper - address@hidden - (812) 855 5560
System Administrator / Informatics Specialist
Molecular Structure Center (IUMSC), Chemistry
Indiana University, Bloomington, Indiana

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