[Qemu-devel] [Bug 1829964] Re: HOST VRAM Leak when performs android-x86 window rotation with Virt-GPU

[Eunseok Choi <1829964@bugs.launchpad.net>]

I tested many qemu & linux versions....

in case of qemu,
2.12
3.10
3.12
4.0.0
All versions I tested have same problem....

also I tested many versions of linux 
ubuntu 18.04 18.10
centos 7
fedora 18 19
rhel

Actually it is not only problem of windows rotation, if home launcher
refreshed, vram usage is also up...

I think it related gl related functions...

so I don't sure it is qemu-virt-gpu problem or virt-gpu driver...

That is why I already report this problem to android-x86 devel forum and
author of virt-gpu drvier...

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https://bugs.launchpad.net/bugs/1829964

Title:
  HOST VRAM Leak when performs android-x86 window rotation with Virt-GPU

Status in QEMU:
  Incomplete

Bug description:
  I will report something strange thing about host VRAM leakage after
  anroid-x86 window rotation when it runs with virt-gpu(+ virgl-
  renderer)

  Please watching below video link.

  https://www.youtube.com/watch?v=mJIbGZLWF1s&feature=youtu.be

  (orginal video file : https://drive.google.com/file/d
  /1lkdTx_8yTbSVjKXlnxnnk96fWe-w6Mxb/view?usp=sharing)

  I don't sure what is the problem...

  Here are my tested history
  --------------------------------------------------------------------------------------------------
  Install android-x86 on I7 desktop PCs with intel UHD GPU  - No leak.
  Install android-x86 on I7 desktop PCs with NVIDIA GTX GPU series - No leak.
  Install android-x86 on guest machine emulated skylake cpu with QEMU(+virt-gpu, virgl-renderer) - Leak
  (HOST CPU - I5, INTEL UHD GPU)
  Install android-x86 on guest machine emulated skylake cpu with QEMU(+virt-gpu, virgl-renderer) - Leak
  (HOST CPU - I7, NVIDIA GTX GPU)

  COMMON:
  In case of NVIDIA GPU : check vram using nvidia-smi
  In case of intel UHD GPU : check shared-vram using free cmd

  We checked guest android-x86 system down when vram is full after performing many rotation
  -------------------------------------------------------------------------------------------

  Is it virt-gpu driver's problem?

  I hope someone can help me...

  Thanks in advance!!


  PS


  Here are qemu options I used...

  -machine type=q35,accel=kvm -cpu host --enable-kvm \
  -smp cpus=4,cores=4,threads=1 -m 4096 \
  -drive file=ctb0319.qcow2,format=qcow2,if=virtio,aio=threads \
  -device virtio-vga,virgl=on \
  -device qemu-xhci,id=xhci -device usb-mouse,bus=xhci.0 -device usb-kbd,bus=xhci.0 \
  -soundhw hda -display sdl,gl=on -netdev user,id=qemunet0,hostfwd=tcp::4000-:7000,hostfwd=tcp::5555-:5555,hostfwd=tcp::4012-:7012,hostfwd=tcp::4013-:7013 -device virtio-net,netdev=qemunet0 -boot menu=on

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