Re: [Xen-devel] [PATCH v2 2/2] libxl: Fix nographic with upstream qemu

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Mon, Nov 25, 2013 at 08:39:22PM +0100, Sander Eikelenboom wrote:
> 
> Monday, November 25, 2013, 8:28:27 PM, you wrote:
> 
> > 2013/11/25 Anthony PERARD <anthony.perard@xxxxxxxxxx>
> 
> >> On Tue, Nov 19, 2013 at 03:57:09PM +0100, Fabio Fantoni wrote:
> >> > Fix xl nographic parameter with upstream qemu using vga none
> >> > instead of -nographic qemu parameter not working anymore and
> >> > deprecated.
> >> >
> >> > Changes from v1:
> >> > - libxl_create.c:
> >> >  - add vga=none if nographic=1 only with upstream qemu
> >> >  - move setdefault of nographic up, otherwise xl create will
> >> >    fail if nographic xl paramter is not set
> >>
> >> Could you tell me where it is said that -nographic is deprecated?
> >>
> 
> > On one old qemu-devel post if I remember good, I not found it now with fast
> > search.
> 
> this one of mine:
> http://osdir.com/ml/xen-development/2013-10/msg00134.html
> 
> which refers to a post on qemu-devel:
> http://comments.gmane.org/gmane.comp.emulators.qemu/172385

Thanks for the pointers.

> >>
> >> Also, I've did few tests, and it look like nographic=1 still works well.
> >>
> 
> > When I did a tests time ago with upstream qemu gave always cirrus vga with
> > hvm domUs, also with vga and stdvga not setted and nographic on.
> > Tried also removing my patches about -nodefaults but same result.
> > When I did this patches I found that xl setted cirrus in any case and also
> > with -nographic with upstream qemu not override -vga or -device.
> 
> 
> >>
> >> In QEMU, "-vga none" and "-nographic" are two different things. The
> >> first parameter disable the graphic emulation, which mean you can have a
> >> guest without graphic card (lspci will show that). The second one is to
> >> disable any graphic output (sdl, vnc, ...).
> >>
> >> The only issue might be the documentation.
> >>
> 
> > Sorry, about qemu traditional I haven't well documented, but on this patch
> > I setted nographic equivalent to vga none only with upstream qemu, so the
> > qemu-trad remain correctly.
> > Another note, I use spice with upstream qemu instead of vnc (because is
> > largely better), probably -nographic not disable it.
> 
> > Sumarizing, previous patch about vga none after new version following your
> > advice can be useful in any case.
> > About nographic instead I am doubtful about how to proceed, I think,
> > however that an improvements and/or more documentations are needed.
> > Ideas or tips about nographic?


After reading those threads about nographic deprecation, it is said that
it is better to use '-display none' instead of '-nographic'.
So '-display none' just mean you get no VNC, no SDL window, no SPICE,
nothing, but you can still get a graphic card in the guest, with no way
to display its output.

I suppose 'nographic' xl options should keep the same effect which is no
graphic output. So if you want a guest without graphic card, then your
new 'vga=none' will be for you.


-- 
Anthony PERARD

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