Xen project Mailing List

2013/12/18 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.

The first patch with v3 should be good:
http://lists.xen.org/archives/html/xen-devel/2013-12/msg00725.html

and vga none can be useful in some cases but probably will be applied only with xen 4.5 because 4.4 is on freeze and near to first rc.

About the second patch after Anthony reply I understand that the patch is bad, I do not know how to improve this part in the best way and I'm currently busy with many other things.

--
Sander

> --
> Sander

--
Best regards,
Sander mailto:linux@xxxxxxxxxxxxxx

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