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Old 12th October 2016
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Default The vmm(4) hypervisor has been enabled

OpenBSD-current users with appropriate hardware can now begin using the new hypervisor, which will be available with 6.1-release.

See this OpenBSD Journal article for details.
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Old 12th October 2016
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Does it support both i386 and amd64 OpenBSD's images virtualized under/inside OpenBSD amd64?
Sadly I can't check this experimentaly, because my Pentium lacks VT-x.
Edit:
I have also asked on mailing list:
http://openbsd-archive.7691.n7.nabbl...-td306385.html
http://marc.info/?l=openbsd-misc&m=147628549211997&w=2
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Old 12th October 2016
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And mlarkin@ replied to your query, with *yes*.
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Old 13th October 2016
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This presentation that Mike published in March may be helpful for those interested in the OpenBSD hipervisor. There has been a lot of development since, but the general structure and interoperation between vmm(4), vmd(8), vmctl(8), virtio(4) devices, and virtual CPUs is well described.
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Old 15th October 2016
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Thanks jggimi.
I was thinking that hipervisor supports also AMD hardware, of couse those with hardware virtualization capabilities AMD-V, but it turns out that this is not the case.
At least for now. Maybe it is going to change.
I have an Intel Pentium without VT-x anyway, but IMHO it is worth to note for others.
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Old 21st October 2016
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vmm(4) for i386 hosts has been added.

Mike's commit states:
Quote:
vmm(4) for i386. Userland changes forthcoming. Note that for the time being,
i386 hosts are limited to running only i386 guests, even if the underlying
hardware supports amd64. This is a restriction I hope to lift moving forward,
but for now please don't report problems running amd64 guests on i386 hosts...
http://cvsweb.openbsd.org/cgi-bin/cv...-cvsweb-markup
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Old 15th December 2016
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Two new developments:
  1. Quote:
    Allow a guest to reboot by reinitializing its state and booting again.
    This is technically a reset since memory is cleared and the dmesg
    buffer is lost.
    http://marc.info/?l=openbsd-cvs&m=148169875815737&w=2
  2. Quote:
    Allow to start disabled and pre-configured VMs by name, "vmctl start foo".
    http://marc.info/?l=openbsd-cvs&m=148175025231551&w=2
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