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

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Hello Sander,

Tuesday, November 26, 2013, 1:30:41 PM, you wrote:


> Tuesday, November 26, 2013, 12:53:09 PM, you wrote:

>> 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.

> Wouldn't it be more natural to do just
> vnc=0
> sdl=0
> vga=none

> if i want no graphics?

> Instead of making a "meta-option" which overrules other available options ?
> Would simplify the parsing for libxl as well.

Hi Anthony / Fabio,

Just a little *ping* here ..
I haven't seen a response any more, nor seem Fabio's patches to be applied.

--
Sander

> --
> Sander



-- 
Best regards,
 Sander                            mailto:linux@xxxxxxxxxxxxxx


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