[libvirt-users] sr-iov on Intel 82576 and rhel 7 - would not work

[lejeczek]

yes, I've tried both PFs' VFs - no difference
if I only take SR-IOV out and use virtio that guest works 
perfectly fine.
Hardware is a Supermicro H8DG6/H8DGi + Opterons 6366 HE and 
an Intel 82576 Gigabit Network Connection (rev 01).
It seems very weird, I think if I am not missing anything 
config-wise then either the hardware platform as a whole 
or/and libvirt-qemu-kernel is buggy.
any suggestion on how to troubleshoot it?
many thanks

ps. would you know how to make sure abrtd auto-reports to 
bugzilla in a non-gui target?

On 20/09/14 22:59, Laine Stump wrote:
> On 09/19/2014 10:35 AM, lejeczek wrote:
>> hi everybody
>>
>> a windows kvm guest would not start, process gets killed with:
>>
>> Out of memory: Kill process 21984 (qemu-kvm) score 44 or sacrifice child
>>
>> I really don't know where/what I might be missing, config seems fine,
>> everything looks ok - I only am not sure, do I need to first stub a
>> SR-IOV device like regular passthrough?
>>
>> I'm trying sr-iov, having one NIC left to the host and the second give
>> to a pool.
> I'm not aware of any way that error message might be related to device
> passthrough.
>
> Your config looks fine, as long as enp2s0f1 is the SRIOV card's PF
> (Physical Function) and the output of ip link show dev enp2s0f1 shows a
> list of VFs. In the case that you have no VFs created for that device,
> yoou can make sure this happens by adding the following to
> /etc/modprobe.d/local.conf:
>
>    options igb max_vfs=7
>
> BTW, unless you're concerned about the amount of bandwidth available on
> a single port of your switch, you can use the PF for host networking,
> and still use the VFs of that same PF for passthrough assignment to guests.
>
>> Then I have
>>
>> in a guest:
>>
>>      <interface type='network'>
>>        <mac address='52:54:00:99:df:43'/>
>>        <source network='passthrough-pool'/>
>>        <model type='rtl8139'/>
>>        <address type='pci' domain='0x0000' bus='0x00' slot='0x07'
>> function='0x0'/>
>>      </interface>
>>
>> and the net:
>>
>> <network>
>>    <name>passthrough-pool</name>
>>    <uuid>dd5b4aa3-7c46-4874-a17f-6c0582738bd5</uuid>
>>    <forward mode='hostdev' managed='yes'>
>>      <pf dev='enp2s0f1'/>
>>    </forward>
>> </network>
>>
>> ----
>> 02:00.0 Ethernet controller: Intel Corporation 82576 Gigabit Network
>> Connection (rev 01)
>>      Subsystem: Super Micro Computer Inc Device 10c9
>>      Flags: bus master, fast devsel, latency 0, IRQ 40
>>      Memory at dfce0000 (32-bit, non-prefetchable) [size=128K]
>>      Memory at dfcc0000 (32-bit, non-prefetchable) [size=128K]
>>      I/O ports at a800 [size=32]
>>      Memory at dfc9c000 (32-bit, non-prefetchable) [size=16K]
>>      Expansion ROM at dfca0000 [disabled] [size=128K]
>>      Capabilities: [40] Power Management version 3
>>      Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
>>      Capabilities: [70] MSI-X: Enable+ Count=10 Masked-
>>      Capabilities: [a0] Express Endpoint, MSI 00
>>      Capabilities: [100] Advanced Error Reporting
>>      Capabilities: [140] Device Serial Number 00-25-90-ff-ff-72-bb-e2
>>      Capabilities: [150] Alternative Routing-ID Interpretation (ARI)
>>      Capabilities: [160] Single Root I/O Virtualization (SR-IOV)
>>      Kernel driver in use: igb
>> 02:00.1 Ethernet controller: Intel Corporation 82576 Gigabit Network
>> Connection (rev 01)
>>      Subsystem: Super Micro Computer Inc Device 10c9
>>      Flags: bus master, fast devsel, latency 0, IRQ 41
>>      Memory at dfc20000 (32-bit, non-prefetchable) [size=128K]
>>      Memory at dfc00000 (32-bit, non-prefetchable) [size=128K]
>>      I/O ports at a400 [size=32]
>>      Memory at dfbdc000 (32-bit, non-prefetchable) [size=16K]
>>      Expansion ROM at dfbe0000 [disabled] [size=128K]
>>      Capabilities: [40] Power Management version 3
>>      Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
>>      Capabilities: [70] MSI-X: Enable+ Count=10 Masked-
>>      Capabilities: [a0] Express Endpoint, MSI 00
>>      Capabilities: [100] Advanced Error Reporting
>>      Capabilities: [140] Device Serial Number 00-25-90-ff-ff-72-bb-e2
>>      Capabilities: [150] Alternative Routing-ID Interpretation (ARI)
>>      Capabilities: [160] Single Root I/O Virtualization (SR-IOV)
>>      Kernel driver in use: igb
>>
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