[Bug 212859] New: Nested virtualization does not work well

[Bug 212859] New: Nested virtualization does not work well

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=212859

            Bug ID: 212859
           Summary: Nested virtualization does not work well
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.19.188-amd64-cust1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: ne-vlezay80@yandex.ru
        Regression: No

Qemu version: 2.8.1

System: Devuan Ascii

Problem:

If you try to use nested virtualization and run linux or openbsd on it, then
the system inside the nested virtual machine periodically freezes. If you watch
strace, there are a lot of timeouts during the hangup. But, if you use a kernel
from 5.10+ and qemu 5.20 on the host, then everything is fine. Nested
virtualization works fine. Also run kernel 4.19.* on qemu, problem is not
appers.

Demonstration:
https://youtu.be/mrMPukeTntQ

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[Bug 212859] Nested virtualization does not work well

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=212859

Alexey Boldyrev (ne-vlezay80@yandex.ru) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |opw
                 CC|                            |ne-vlezay80@yandex.ru
           Hardware|All                         |x86-64

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