Thanks for your feedback and tests Murilo*2 (There seems to be a team of
Murilo's on this :-) - thanks for your efforts and fast responses
bringing this case forward.)

With the main changes requested I really think we need the patch in #8
to avoid issues on other HW setups that due to the new code will end up
having non-aligned sections in vfio_memory-Listener. We need #8 clearly
more for the avoidance of the false-positive fatal error than the log.
And we then need #9 to avoid this log from flooding and instead being a
tracepoint.

I have respun the build in the PPA [1] which now is at 2.11+dfsg-
1ubuntu7.20~ppa2 including these patches. It would be great if you could
give these another try - not that we might have introduced changes
breaking to your case by that.

[1]:
https://launchpad.net/~paelzer/+archive/ubuntu/bug-1847948-nvmeperf-1842774
-z15name-bionic/

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Title:
  Improve NVMe guest performance on Bionic QEMU

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