I've included patch above into Bionic tree:
commit 9bff5f095923aab04411cf4e9135b975b70e3ead (tag: Ubuntu-4.15.0-58.64,
origin/master, origin/HEAD)
Author: Stefan Bader <stefan.ba...@canonical.com>
Date: Tue Aug 6 10:45:37 2019
UBUNTU: Ubuntu-4.15.0-58.64
And it, indeed, fixed the issue.
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https://bugs.launchpad.net/bugs/1834522
Title:
Bionic QEMU with Bionic Kernel hangs in AMD FX-8350 with cpu-host as
passthrough
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
In Progress
Bug description:
[Impact]
* QEMU does not work in some AMD hardware when using host-passthrough as
cpu-mode (usually to allow nested KVM to work).
* QEMU does not start, hanging before the VM initialization.
[Test Case]
* to use Xenial qemu on top of a regular Xenial kernel -> doesn't work
(intermittent)
* to use the following XML file: https://paste.ubuntu.com/p/BSyFY7ksR5/
* to have AMD FX(tm)-8350 Eight-Core Processor CPU or similar
* to use Xenial qemu on top of a HWE kernel -> works
[Regression Potential]
* TODO
[Other Info]
* TODO
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