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Re: [Qemu-devel] PCI passthrough of 40G ethernet interface (Openstack/KV


From: jacob jacob
Subject: Re: [Qemu-devel] PCI passthrough of 40G ethernet interface (Openstack/KVM)
Date: Mon, 16 Mar 2015 14:24:23 -0400

On Mon, Mar 16, 2015 at 2:12 PM, Bandan Das <address@hidden> wrote:
> jacob jacob <address@hidden> writes:
>
>> I also see the following in dmesg in the VM.
>>
>> [    0.095758] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
>> [    0.096006] acpi PNP0A03:00: ACPI _OSC support notification failed,
>> disabling PCIe ASPM
>> [    0.096915] acpi PNP0A03:00: Unable to request _OSC control (_OSC
>> support mask: 0x08)
> IIRC, For OSC control, after BIOS is done with (whatever initialization
> it needs to do), it clears a bit so that the OS can take over. This message,
> you are getting is a sign of a bug in the BIOS (usually). But I don't
> know if this is related to your problem. Does "dmesg | grep -e DMAR -e IOMMU"
> give anything useful ?

Do not see anything useful in the output..

>> [    0.097072] acpi PNP0A03:00: fail to add MMCONFIG information,
>> can't access extended PCI configuration space under this bridge.
>>
>> Does this indicate any issue related to PCI passthrough?
>>
>> Would really appreciate any input on how to bebug this further.
>
> Did you get a chance to try a newer kernel ?
Currently am using 3.18.7-200.fc21.x86_64 which is pretty recent.
Are you suggesting trying the newer kernel just on the host? (or VM too?)

>> On Fri, Mar 13, 2015 at 10:08 AM, jacob jacob <address@hidden> wrote:
>>>> So, it could be the i40e driver then ? Because IIUC, VFs use a separate
>>>> driver. Just to rule out the possibility that there might be some driver 
>>>> fixes that
>>>> could help with this, it might be a good idea to try a 3.19 or later 
>>>> upstream
>>>> kernel.
>>>>
>>>
>>> I tried with the latest DPDK release too (dpdk-1.8.0) and see the same 
>>> issue.
>>> As mentioned earlier, i do not see any issues at all when running
>>> tests using either i40e or dpdk on the host itself.
>>> This is the reason why i am suspecting if it is anything to do with 
>>> KVM/libvirt.
>>> Both with regular PCI passthrough and VF passthrough i see issues. It
>>> is always pointing to some issue with packet transmission. Receive
>>> seems to work ok.
>>>
>>>
>>> On Thu, Mar 12, 2015 at 8:02 PM, Bandan Das <address@hidden> wrote:
>>>> jacob jacob <address@hidden> writes:
>>>>
>>>>> On Thu, Mar 12, 2015 at 3:07 PM, Bandan Das <address@hidden> wrote:
>>>>>> jacob jacob <address@hidden> writes:
>>>>>>
>>>>>>>  Hi,
>>>>>>>
>>>>>>>  Seeing failures when trying to do PCI passthrough of Intel XL710 40G
>>>>>>> interface to KVM vm.
>>>>>>>      0a:00.1 Ethernet controller: Intel Corporation Ethernet
>>>>>>> Controller XL710 for 40GbE QSFP+ (rev 01)
>>>>>>
>>>>>> You are assigning the PF right ? Does assigning VFs work or it's
>>>>>> the same behavior ?
>>>>>
>>>>> Yes.Assigning VFs worked ok.But this had other issues while bringing down 
>>>>> VMs.
>>>>> Interested in finding out if PCI passthrough of 40G intel XL710
>>>>> interface is qualified in some specific kernel/kvm release.
>>>>
>>>> So, it could be the i40e driver then ? Because IIUC, VFs use a separate
>>>> driver. Just to rule out the possibility that there might be some driver 
>>>> fixes that
>>>> could help with this, it might be a good idea to try a 3.19 or later 
>>>> upstream
>>>> kernel.
>>>>
>>>>>>> From dmesg on host:
>>>>>>>
>>>>>>>> [80326.559674] kvm: zapping shadow pages for mmio generation wraparound
>>>>>>>> [80327.271191] kvm [175994]: vcpu0 unhandled rdmsr: 0x1c9
>>>>>>>> [80327.271689] kvm [175994]: vcpu0 unhandled rdmsr: 0x1a6
>>>>>>>> [80327.272201] kvm [175994]: vcpu0 unhandled rdmsr: 0x1a7
>>>>>>>> [80327.272681] kvm [175994]: vcpu0 unhandled rdmsr: 0x3f6
>>>>>>>> [80327.376186] kvm [175994]: vcpu0 unhandled rdmsr: 0x606
>>>>>>
>>>>>> These are harmless and are related to unimplemented PMU msrs,
>>>>>> not VFIO.
>>>>>>
>>>>>> Bandan
>>>>> --
>>>>> To unsubscribe from this list: send the line "unsubscribe kvm" in
>>>>> the body of a message to address@hidden
>>>>> More majordomo info at  http://vger.kernel.org/majordomo-info.html



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