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

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Date:   Mon, 05 Dec 2016 18:44:14 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Jike Song <jike.song@...el.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

  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:

  * 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.

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?

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

thanks,
  Gerd