[Xen-devel] XenDom0/FreeBSD: guest crash when nested virtualization is used

[Oleg Ginzburg <olevole@xxxxxxxxxx>]

Hello maillist,

I use XEN on the FreeBSD platform. Everything worked fine until I
needed to use nested virtualization (for testing purposes).

After some communication with Roger Pau Monné, maintainer of XEN port
in FreeBSD ( https://www.freshports.org/emulators/xen-kernel )  it was
suggested that this might be a common Xen problem and not related to
FreeBSD.

My case:

Host env: FreeBSD 13-HEAD/amd64 r349909
Xen kernel version: 4.12.0_3  ( FreeBSD ports version )
Xen tools version: 4.12.0_2 (FreeBSD ports version )
OS Inside guest vm: Linux Debian 9.9.0 amd64

When I try to run a virtual machine inside a virtual machine ( via
virsh/virt-manager ), the guest simply terminates.

I would appreciate any help and comments.
Please let me know if I can help debug this issue.

attached files:
  dmesg.boot: from /var/run/dmesg.boot of the host
  gdb.txt: messages from gdb session with 'xl create' .. (no any bt)
  messages: from /var/log/messages of the host (syslog output)
  qemu-dm-debian1.log: from /var/log/xen/ directory
  xen.cfg: config file for 'xl create'
  xl.info:  xl info output from the host
  xl-debian.1.log: from /var/log/xen/ directory
  xl-dmesg.txt: output from 'xl dmesg' command after guest crash

Attachment: gdb.txt
Description: Text document

Attachment: xen.cfg
Description: Binary data

Attachment: dmesg.boot
Description: Binary data

Attachment: messages
Description: Binary data

Attachment: qemu-dm-debian1.log
Description: Text Data

Attachment: xl-dmesg.txt
Description: Text document

Attachment: xl-debian1.log
Description: Text Data

Attachment: xl.info
Description: Binary data

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