Re: [Xen-devel] [PATCH] libxl: new parameters for upstream qemu's vga interfaces

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

Il 10/10/2013 14:36, Sander Eikelenboom ha scritto:
> Thursday, October 10, 2013, 2:29:46 PM, you wrote:
>
> > Il 10/10/2013 12:51, Sander Eikelenboom ha scritto:
> > > Thursday, October 10, 2013, 12:09:44 PM, you wrote:
> > >
> > > > Il 10/10/2013 11:32, Ian Campbell ha scritto:
> > > > > On Thu, 2013-10-10 at 11:26 +0200, Fabio Fantoni wrote:
> > > > > > Il 30/09/2013 12:12, Fabio Fantoni ha scritto:
> > > > > > > Change the qemu parameters for upstream qemu vgas to the
> > > > > > > new ones (-device), introduced some years ago.
> > > > > > Ping
> > > > > Please CC the qemu maintainers (Stefano & Anthony), although these
> > > > > patches touch the toolstack they are logically qemu patches and need
> > > > > their ack.
> > > > Thanks for your reply, I added Anthony on CC and Stefano was already on it.
> > > Should "None" be added as option as well ?
> > There is already a nographic xl parameter that controls the
> > corresponding qemu parameter, it should be the same thing.
> > And FWIK the none option applies only to the old -vga parameter and
> > according to qemu docs/qdev-device-use.txt, the new way to do it is with
> > -nodefaults (I already made a patch to add it). -nographic is probably
> > also deprecated.
> In this conversation http://comments.gmane.org/gmane.comp.emulators.qemu/172385
> the -nographic is said to be deprecated by peter maydell.
> Didn't know -vga none was also out the door already ...
I did some test and I found out that now is impossible disable the 
emulated vga on hvm domUs.
I got cirrus vga (the default) even if vga xl parameter is not setted.
Also with nographic enabled there is the emulated vga.
I think that good solution is:
- add this patch and nodefault patch
- add "none" option to vga xl parameter (that will exclude any emulated 
vga qemu parameters)
- remove -nographic parameter in upstream qemu, making nographic xl 
paramater deprecated and equivalent to new vga="none" xl parameter.
With these changes all should be working and without qemu deprecated 
parameters (-nographic and -vga).
I'm waiting Stefano and/or Anthony replies before write the patches.

Another question is about xenfb vga that seems missed on new -device 
parameter.
I used it to have basic Spice support for pv working: 
http://lists.xen.org/archives/html/xen-devel/2013-09/msg03207.html
Anyone can update about it on newer qemu versions please?

Thanks for any reply

> > > > > > > Signed-off-by: Fabio Fantoni <fabio.fantoni@xxxxxxx>
> > > > > > > ---
> > > > > > >      tools/libxl/libxl_dm.c |   12 +++++-------
> > > > > > >      1 file changed, 5 insertions(+), 7 deletions(-)
> > > > > > >
> > > > > > > diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
> > > > > > > index 43c3bec..2c6f5d9 100644
> > > > > > > --- a/tools/libxl/libxl_dm.c
> > > > > > > +++ b/tools/libxl/libxl_dm.c
> > > > > > > @@ -486,15 +486,13 @@ static char ** 
> > > > > > > libxl__build_device_model_args_new(libxl__gc *gc,
> > > > > > >      
> > > > > > >              switch (b_info->u.hvm.vga.kind) {
> > > > > > >              case LIBXL_VGA_INTERFACE_TYPE_STD:
> > > > > > > -            flexarray_vappend(dm_args, "-vga", "std", NULL);
> > > > > > > +            flexarray_append_pair(dm_args, "-device", "VGA");
> > > > > > >                  break;
> > > > > > >              case LIBXL_VGA_INTERFACE_TYPE_CIRRUS:
> > > > > > > -            flexarray_vappend(dm_args, "-vga", "cirrus", NULL);
> > > > > > > -            if (b_info->video_memkb) {
> > > > > > > -                flexarray_vappend(dm_args, "-global",
> > > > > > > -                    GCSPRINTF("vga.vram_size_mb=%d",
> > > > > > > -                    libxl__sizekb_to_mb(b_info->video_memkb)), NULL);
> > > > > > > -            }
> > > > > > > +            flexarray_append_pair(dm_args, "-device", "cirrus-vga");
> > > > > > > +            flexarray_append_pair(dm_args, "-global",
> > > > > > > +                GCSPRINTF("vga.vram_size_mb=%d",
> > > > > > > +                libxl__sizekb_to_mb(b_info->video_memkb)));
> > > > > > >                  break;
> > > > > > >              }
> > > > > > >      

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