virtio-gpu

• ​Virgil 3D GPU project by virgil3d

• ​Virt-Manager 1.4 Exposes The New OpenGL Options - Phoronix
• ​Using virtio-gpu with libvirt and spice | kraxel's news

QXL vs virtio-vga

• 結論から言うと、SPICEが未対応のためvirt-manager下では3D accelerationを有効にできない
  • ​https://wiki.archlinux.org/index.php/QEMU#virtio virtio-vga / virtio-gpu is a paravirtual 3D graphics driver based on ​virgl.

    As of September 2016, support for the spice protocol is under development and can be tested installing the development release of spice (>= 0.13.2).

• H/W: wiki:TipAndDoc/Hardware#ASUSH97M-PLUS
• S/W
  • ArchLinux 4.7.6-1
  • qemu 2.7.0-2
  • seabios 1.9.3-1
  • libvirt 2.3.0-1
  • spice 0.12.8-1
  • virt-manager 1.4.0-2

QXL

• mitty@guest:~$ lspci

  00:02.0 VGA compatible controller: Red Hat, Inc. QXL paravirtual graphic card (rev 04)
  

• mitty@guest:~$ dmesg | grep drm

  [    1.057734] [drm] Initialized drm 1.1.0 20060810
  [    1.110306] [drm] Device Version 0.0
  [    1.110308] [drm] Compression level 0 log level 0
  [    1.110309] [drm] Currently using mode #0, list at 0x488
  [    1.110309] [drm] 12286 io pages at offset 0x1000000
  [    1.110310] [drm] 16777216 byte draw area at offset 0x0
  [    1.110310] [drm] RAM header offset: 0x3ffe000
  [    1.110311] [drm] rom modes offset 0x488 for 128 modes
  [    1.110364] [drm] qxl: 16M of VRAM memory size
  [    1.110364] [drm] qxl: 63M of IO pages memory ready (VRAM domain)
  [    1.110365] [drm] qxl: 64M of Surface memory size
  [    1.112882] [drm] main mem slot 1 [f4000000,3ffe000]
  [    1.112884] [drm] surface mem slot 2 [f8000000,4000000]
  [    1.113677] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
  [    1.113679] [drm] No driver support for vblank timestamp query.
  [    1.113891] [drm] fb mappable at 0xF4000000, size 3145728
  [    1.113891] [drm] fb: depth 24, pitch 4096, width 1024, height 768
  [    1.113892] fb: switching to qxldrmfb from VESA VGA
  [    1.115537] fbcon: qxldrmfb (fb0) is primary device
  [    1.116425] [drm:qxl_enc_commit [qxl]] *ERROR* head number too large or missing monitors config: ffffc90000748000, 0
  [    1.118767] qxl 0000:00:02.0: fb0: qxldrmfb frame buffer device
  [    1.136842] [drm] Initialized qxl 0.1.0 20120117 for 0000:00:02.0 on minor 0
  

• minecraftは一応動いた
  

virtio-vga (no 3D)

• mitty@guest:~$ lspci

  00:02.0 VGA compatible controller: Red Hat, Inc Virtio GPU (rev 01)
  

• mitty@guest:~$ dmesg | grep drm

  [    0.690401] [drm] Initialized drm 1.1.0 20060810
  [    0.714409] [drm] pci: virtio-vga detected
  [    0.714412] fb: switching to virtiodrmfb from VESA VGA
  [    0.714786] [drm] virgl 3d acceleration not available
  [    0.715117] [drm] virtio vbuffers: 80 bufs, 192B each, 15kB total.
  [    0.715164] [drm] number of scanouts: 1
  [    0.715177] [drm] number of cap sets: 0
  [    0.717593] virtio_gpu virtio0: fb0: virtiodrmfb frame buffer device
  [    0.726158] [drm] Initialized virtio_gpu 0.0.1 0 on minor 0
  

• 3Dが有効にならない場合、QXLとほぼ変わらない
  

errors

• ​virtio-gpu and libvirt | kraxel's news こちらを参考に、virsh editで直接編集してみたが、起動に失敗する

1. mitty@host:~$ diff -u virgil.orig.xml virgil.gl.xml

   virgil.

   @@ -87 +87 @@
        <graphics type='spice' autoport='yes' listen='0.0.0.0'>
          <listen type='address' address='0.0.0.0'/>
          <image compression='off'/>
   +      <gl enable='yes'/>
        </graphics>
        <sound model='ich6'>
          <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>

   • mitty@host:~$ virsh start virgil

     error: Failed to start domain virgil
     error: unsupported configuration: This QEMU doesn't support spice OpenGL
     

2. mitty@host:~$ diff -u virgil.orig.xml virgil.gl.xml

   virgil.

   @@ -1 @@
   -<domain type='kvm'>
   +<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
      <name>virgil</name>
      <uuid>afd14745-a9f3-44ea-b2da-e2eefabea22b</uuid>
      <memory unit='KiB'>4194304</memory>
   @@ -84 +84 @@
        </channel>
        <input type='mouse' bus='ps2'/>
        <input type='keyboard' bus='ps2'/>
   -    <graphics type='spice' autoport='yes' listen='0.0.0.0'>
   -      <listen type='address' address='0.0.0.0'/>
   -      <image compression='off'/>
   -    </graphics>
   +    <graphics type='sdl' display=':0' xauth='/home/mitty/.Xauthority'/>
        <sound model='ich6'>
          <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
        </sound>
   @@ -105 +102 @@
          <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
        </memballoon>
      </devices>
   +  <qemu:commandline>
   +    <qemu:arg value='-set'/>
   +    <qemu:arg value='device.video0.driver=virtio-vga'/>
   +    <qemu:arg value='-display'/>
   +    <qemu:arg value='gtk,gl=on'/>
   +  </qemu:commandline>
    </domain>

   • mitty@host:~$ virsh start virgil

     error: Failed to start domain virgil
     error: internal error: process exited while connecting to monitor: Unable to init server: Could not connect: Connection refused
     2016-10-08T15:12:30.027297Z qemu-system-x86_64: OpenGL is not supported by the display
     

   • ホスト上でXを動かせば良さそう