linux-kernel - Re: [PATCH v9 00/12] Add Mediated device support

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Date:   Tue, 06 Dec 2016 10:24:32 +0800
From:   Jike Song <jike.song@...el.com>
To:     Gerd Hoffmann <kraxel@...hat.com>
CC:     Kirti Wankhede <kwankhede@...dia.com>, alex.williamson@...hat.com,
        cjia@...dia.com, pbonzini@...hat.com, qemu-devel@...gnu.org,
        kvm@...r.kernel.org, kevin.tian@...el.com,
        bjsdjshi@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 00/12] Add Mediated device support

On 12/06/2016 01:44 AM, Gerd Hoffmann wrote:
>   Hi,
> 
>> Just want to share that we have published a KVMGT implementation
>> based on this v9 patchset, to:
>>
>> 	https://github.com/01org/gvt-linux/tree/gvt-next-kvmgt
>>
>> It doesn't utilize common routines introduced by 05+ patches yet.
>> The complete intel vGPU device-model is contained.
> 
> Tried to use this implementation.  Used the
> topic/gvt-next-kvmgt-mdev-2016-11-18 branch which looked like the most
> recent one.  Setup:
> 

Hi Gerd,

We didn't catch up with updating the newest kvmgt code accordingly,
partly because we are preparing the 'final' version to be upstreamed.

Will update a topic/gvt-next-kvmgt-2016-12-06 today, sorry for the
inconvenience :)

>   * Everything compiled as modules.
>   * iommu turned off for the igd (intel_iommu=on,igfx_off).
>   * Blacklisted i915 so dracut initrd doesn't load it
>     (rd.driver.blacklist=i915)
>   * tweaked module config so kvmgt is loaded before i915,
>     also enable gvt:
> 
>       # cat /etc/modprobe.d/kraxel-gvt.conf 
>       options i915 enable_gvt=1
>       softdep i915 pre: kvmgt
> 
> Everything seems to load fine.  Sysfs files are there, and I can create
> vgpus.
> 

Yes, everything looks good so far.

> Trying to assign a vgpu this way:
> 
>   -device vfio-pci,sysfsdev=/sys/class/mdev_bus/0000:00:02.0/<uuid>
> 
> fails though and gives this message in the kernel log:
> 
>   [  402.560350] [drm:intel_vgpu_open [kvmgt]] *ERROR* gvt: KVM is
> required to use Intel vGPU
> 
> Trying the same with a mtty sample device works and I can see the pci
> serial device in the guest.
> 
> Any clues what is going wrong?

The getting kvm instance code is missing in that branch, will be
contained in the new one.

> Has this version any support for exporting the guest display as dma-buf,
> so qemu can show it?  Or is this a headless vgpu?

No, this version doesn't have dma-buf support yet, we were using x11vnc
in guest to test it internally. I'll include you in the igvt-g-dev
mailing list for further discussion :)

--
Thanks,
Jike