[Bug 1877716] Re: Win10 guest unusable after a few minutes

[post-factum]

Unofficial x86_64 build of v5.0.0 with those 2 patches for Arch is here:
[1].

[1] https://download.opensuse.org/repositories/home:/post-
factum/Arch/x86_64/

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https://bugs.launchpad.net/bugs/1877716

Title:
  Win10 guest unusable after a few minutes

Status in QEMU:
  New

Bug description:
  On Arch Linux, the recent qemu package update seems to misbehave on
  some systems. In my case, my Windows 10 guest runs fine for around 5
  minutes and then start to get really sluggish, even unresponsive. It
  needs to be forced off. I could reproduce this on a minimal VM with no
  passthrough, although my current testing setup involves an nvme pcie
  passthrough.

  I bisected it to the following commit which rapidly starts to run sluggishly 
on my setup:
  https://github.com/qemu/qemu/commit/73fd282e7b6dd4e4ea1c3bbb3d302c8db51e4ccf

  I've ran the previous commit (
  https://github.com/qemu/qemu/commit/b321051cf48ccc2d3d832af111d688f2282f089b
  ) for the entire night without an issue so far.

  I believe this might be a duplicate of
  https://bugs.launchpad.net/qemu/+bug/1873032 , although I'm not sure.

  Linux cc 5.6.10-arch1-1 #1 SMP PREEMPT Sat, 02 May 2020 19:11:54 +0000 x86_64 
GNU/Linux
  AMD Ryzen 7 2700X Eight-Core Processor

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