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Re: HVM virtualization?

Manuel Bouyer <> writes:

> On Sat, Oct 31, 2020 at 06:36:45PM -0400, Greg Troxel wrote:
>> Manuel Bouyer <> writes:
>> > On Sat, Oct 31, 2020 at 01:37:17PM -0500, Jeremy C. Reed wrote:
>> >> One of my hosting providers is converting VPSes from PV to HVM 
>> >> virtualization due to security issue
>> >>
>> >> 
>> >> They say NetBSD does not work under HVM mode and can choose a different 
>> >> BSD (or Linux).
>> >> 
>> >> Can someone tell me about this? I did look briefly at 
>> >> but don't understand the context 
>> >> of the wiki saying it is supported but the hosting provider saying it 
>> >> does not work.
>> >
>> > plain HVM, with emulated devices, works without problems (and always has).
>> > If they only support PV devices, then it works only in HEAD (GENERIC supports
>> > it)
>> I have heard that the issue with with qemu "stub domains" and with
>> those, NetBSD ends up with PIO on disks and is thus unusably slow.
> So running a HEAD GENERIC, which has the PV drivers, would solve this.

It would work around it, not solve it, but yes getting to a functional
state is really the goal.

I realize that's a good workaround, but I also wonder if anyone else has
tried 9-stable GENERIC as HVM with a dom0 that is using stub domains for

(It seems obvious that NetBSD dom0s do not use stub domains.)

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