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

From: Bandan Das
Subject: Re: [Qemu-devel] PCI passthrough of 40G ethernet interface (Openstack/KVM)
Date: Thu, 12 Mar 2015 20:02:50 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4 (gnu/linux)

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 
could help with this, it might be a good idea to try a 3.19 or later upstream

>>> 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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