> On 17 Sep 2019, at 14:21, Warner Losh <i...@bsdimp.com> wrote:
>
>
>
> On Tue, Sep 17, 2019, 11:24 AM Toomas Soome <tso...@me.com
> <mailto:tso...@me.com>> wrote:
>
>
>> On 17 Sep 2019, at 13:09, Warner Losh <i...@bsdimp.com
>> <mailto:i...@bsdimp.com>> wrote:
>>
>>
>>
>> On Tue, Sep 17, 2019, 6:47 AM Toomas Soome <tso...@me.com
>> <mailto:tso...@me.com>> wrote:
>>
>>
>> > On 17 Sep 2019, at 08:30, KIRIYAMA Kazuhiko <k...@truefc.org
>> > <mailto:k...@truefc.org>> wrote:
>> >
>> > Hi,all
>> >
>> > Yesterday I've updated latest head (r352368) and rebuild
>> > 13.0-CURRENT. All went fine, but when I boot, it's stopped
>> > at boot stage. Then I typed `boot', booted normally and put
>> > login prompt and login go ahead. But `shutdown -r now',
>> > stopped at loader prompt same as login case. What happened?
>> > All I've done is whithin bhyve VM.
>> >
>> >
>>
>>
>> > Consoles: userboot
>> >
>> > FreeBSD/amd64 User boot, Revision 1.1
>> > (Mon Jun 18 16:11:55 UTC 2018 r...@releng3.nyi.freebsd.org
>> > <mailto:r...@releng3.nyi.freebsd.org>)
>> > Loading /boot/defaults/loader.conf
>> > xemit not found
>> > Error while including /boot/frames.4th, in the line:
>> > h_el @ xemit
>> >
>> > can't load 'kernel'
>> >
>> > Type '?' for a list of commands, 'help' for more detailed help.
>> > OK
>> >
>>
>> This is unfortunate case where the guest image has more recent boot scripts
>> than hosts /boot/userboot.so has. I did push the fix for that issue to
>> stable/11 and stable/12. The patch does introduce xemit word.
>>
>> Such situation is unfortunate, but accident waiting to happen with this
>> method where we are attempting to use bootloader (userboot.so) from older
>> system to load guest vm.
>>
>> Can we provide a fallback to xemit builtin for old systems without it? I
>> believe we did this for other things as a transition. Forth has a way to do
>> this, though we need to make sure we properly constrain what we pass to
>> emit...
>>
>> Warner
>>
>> P.s. I'm at legoland this week, so I can't look at it for a bit.
>>
>
> Well, the only way to avoid such issue is to make sure the guest environment
> is providing all the needed bits, but since we do have interpreter inside the
> userboot.so and userboot.so is in host, this does set rather unfortunate
> limits what we can do.
>
> Yes. I understand that we are limited in our scripts to somehow testing if
> xemit is a forth word and if not providing a fallback implementation of it in
> forth using emit.
>
>
done:)
rgds,
toomas
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