[Bug 1671677] Re: vfio-pci passthrough issue after resume from suspend

[Thomas Huth]

The QEMU project is currently considering to move its bug tracking to another 
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closed already. Thus we are setting all older bugs to
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If you still think this bug report here is valid, then please switch the state 
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** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1671677

Title:
  vfio-pci passthrough issue after resume from suspend

Status in QEMU:
  Incomplete

Bug description:
  
  I'm running into a weird issue with the vfio-pci driver through qemu

  I use it on a laptop and I passthrough an external GPU connected via
  PCI express. In general this works well, however if the laptop has
  *ever* suspended since its last boot, then the windows guest reports
  an error 43 on the card and I get no output on the monitor that it is
  connected to. This is really weird to me since it works fine if I boot
  the latop from power-off, and hotplug the card. It's only if the
  laptop has ever suspended since it's last boot that I see this issue.
  Even if it was suspended before the card was ever hotplugged.

  In other words:
  laptop off -> boot -> hotplug GPU : works great
  laptop off -> boot -> do stuff (GPU *NOT* connected) -> sleep -> resume -> 
hotplug GPU: problem
  laptop off -> boot -> hotplug GPU -> unplug GPU -> hotplug GPU : works great
  laptop off -> boot -> hotplug GPU -> unplug GPU -> sleep -> resume -> hotplug 
GPU: problem

  Weird stuff...

  I'm honestly not sure that vfio-pci/qemu is to blame here since there
  are so many moving parts, but im not really sure where else to report
  this to

  What I have tried is using the sysfs interface to
  remove/rescan/poweroff/etc the PCI devices in questions (graphics card
  and it's HDMI audio) and this also does help.

  QEMU version: 2.6.1

  Please let me know what other information I can provide

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