Encrypting boot partition Libvirt not showing the OS booting up

[Daniel P. Berrangé]

On Tue, Oct 13, 2020 at 10:40:11AM +0200, john doe wrote:
> On 10/13/2020 8:50 AM, john doe wrote:
> > On 10/13/2020 3:30 AM, Laine Stump wrote:
> > > On 10/12/20 1:10 PM, john doe wrote:
> > > > On 10/12/2020 5:14 PM, Michal Privoznik wrote:
> > > > > On 10/12/20 4:27 PM, john doe wrote:
> > > > > > On 10/12/2020 4:09 PM, Peter Krempa wrote:
> > > > > > > On Mon, Oct 12, 2020 at 16:05:43 +0200, Michal Privoznik wrote:
> > > > > > > > On 10/12/20 2:14 PM, john doe wrote:
> > > > > > > > > > <snip/>
> > > > > > > > > 
> > > > > > > > > I sent privately the requested xml file to 'Peter Krempa
> > > > > > > > > <pkrempa at redhat.com>'.
> > > > > > > > > Peter Krempa 's privately answered me back suggesting to add the
> > > > > > > > > following in the domain xml file:
> > > > > > > > 
> > > > > > > > Solving things privately doesn't help the community.
> > > > > > > 
> > > > > > > Additionally it doesn't help solving the problem, since it's now
> > > > > > > opaque
> > > > > > > to others what the problem might be.
> > > > > > > 
> > > > > > > > > 
> > > > > > > > > <bios useserial='yes'/> under <os>
> > > > > > > 
> > > > > > > I've suggested this as the outputs I've got privately hinted that the
> > > > > > > console (as in virsh console) didn't get to asking for the password,
> > > > > > > while the manually-started-qemu did.
> > > > > > > 
> > > > > > > Thus the problem actually doesn't have to do with encryption or
> > > > > > > wahatver, but the console doesn't plainly work.
> > > > > > > 
> > > > > > > > > 
> > > > > > > > > such as ...
> > > > > > > > > 
> > > > > > > > >   Â Â  <os>
> > > > > > > > >   Â Â Â Â  <type arch='x86_64' machine='pc-q35-3.1'>hvm</type>
> > > > > > > > >   Â Â Â Â  <boot dev='hd'/>
> > > > > > > > >   Â Â Â Â  <bios useserial='yes'/>
> > > > > > > > >   Â Â  </os>
> > > > > > > > > 
> > > > > > > > 
> > > > > > > > Try adding:
> > > > > > > > 
> > > > > > > >      <loader type='rom'>/usr/share/seabios/bios.bin</loader>
> > > > > 
> > > > > Darn, this should have been sgabios: /usr/share/sgabios/sgabios.bin
> > > > > but if your seabios is new enough (v1.11.0 and newer) then this is not
> > > > > needed as seabios itself is capable of serial interface. And looking at
> > > > > earlier e-mails in the thread you have v1.12.0-1 you you're good and
> > > > > don't need to add <loader/> at all.
> > > > > 
> > > > > But honestly, I don't know why you are not getting the console.
> > > > > Could it
> > > > > be that you are getting the console and the qemu is waiting for your
> > > > > input, i.e. what happens if you type in the password?
> > > > > 
> > > > 
> > > > Nothing happened at all if I try to type the password.
> > > > Yes, so am I , I'm totaly lost on why it does not work.
> > > > 
> > > > How can I find the command libvirt is passing to qemu?
> > > 
> > > The qemu command issued by libvirt can be found at the end of
> > > /etc/libvirt/qemu/${guestname}.log
> > > 
> > 
> > Thank you, I have now isolated the command generated by libvirt.
> > Starting this command from a script, a vnc server is started.
> > 
> > Is libvirt internally using vnc connection?
> > 
> 
> It looks like the issue is that the libvirt command pass to qemu is
> using '-display none' where it should be '-nographic'.

No, using "-display none" is correct to disable any graphical display
in QEMU.

-nographic is an old discouraged syntax which has many side effects,
beyond disabling graphical display it mess with serial port config.


Regards,
Daniel
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