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

[jacob jacob]

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)
[    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.

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
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