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To: Thanneeru Srinivasulu <dev.srinivasulu@gmail.com>,
 Bruce Richardson <bruce.richardson@intel.com>
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From: Jason Wang <jasowang@redhat.com>
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Date: Tue, 12 Mar 2019 17:54:39 +0800
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 (mx1.redhat.com [10.5.110.47]); Tue, 12 Mar 2019 09:54:43 +0000 (UTC)
Subject: Re: [dpdk-dev] Query : Does Binding with vfio-pci is supported
 inside qemu-kvm guest/vm instance.?
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On 2019/3/12 下午5:42, Thanneeru Srinivasulu wrote:
> Thanks Bruce..
>
> On Tue, Mar 12, 2019 at 3:08 PM Bruce Richardson
> <bruce.richardson@intel.com> wrote:
>> On Tue, Mar 12, 2019 at 10:57:55AM +0530, Thanneeru Srinivasulu wrote:
>>> Hi Everyone.
>>>
>>> I did attached pice  to Guest VM using vfio-pci with qemu command, and then
>>> tried binding the pcie bdf with vfio-pci, observing binding failure with
>>> vfio-pci.
>>>
>>> Where as when tryied with igb_uio, everything works fine.
>>>
>>> Does Binding with vfio-pci is supported inside VM/guest?
>>>
>> vfio support requires the presence of an IOMMU, and you generally don't
>> have an IOMMU available in a VM.
>>
>> /Bruce


Actually, Qemu support vIOMMU + VFIO in guest[1], all you need is to add 
a intel IOMMU and enabling caching mode.

Thanks


[1]

https://www.lfasiallc.com/wp-content/uploads/2017/11/Device-Assignment-with-Nested-Guests-and-DPDK_Peter-Xu.pdf

>
>