Re: [Xen-users] Configuring qemu-dm for use with HVM domU

[Derek <xen@xxxxxxxxxxxxxxxx>]

Thanks for the response.

 

> The other option is of course to use Windows in "Remote Desktop" mode,
> where you should be able to set (almost) any size you like... And it's
> at least faster than VNC, but may not be as snappy as SDL.

 

Thanks for  the suggestion.  I was not aware windows had such a feature.  I looked at Microsoft's web site, and learned quite a bit about it, although could find no client (viewer) for it that runs on any non-microsoft platform.  To work for me, the viewer would have to run on linux.

 

Probably I should have explained my setup better.  Sorry, I'll try again:

 

It's a workstation, and I need to be able to interact with the windows domU, as well as any Linux domUs I set up.  I figure I should just run an X server on dom0 (or one of the domUs, if I can figure out how), and use it to access all the working sessions in the other domUs.  Accessing those in linux domUs is easy, using standard tools (telnet/rlogin/ssh/X-sessions/vnc/whatever).  Accessing the windows domU seems easy too -- when I start it, a qemu-dm window pops up.  I can "maximize" this qemu-dm to 1280x1024, which would be full-screen on my 1280x1024 monitor.  But, it would be better to make it slightly smaller, so that the linux window manager widgets are still visible along the bottom.  If I tell windows that it's 1280x1024, but shrink the visible window in my X server to, say, 1280x920, unfortunately the windows screen image has it's bottom truncated, so I can't get to the winows start bar.  If the qemu window had scroll bars, this would be no problem, but it doesn't.

 

Following your suggestion, I'll see if I can find a linux client (viewer) for "remote desktop".

 

Thanks again,

Derek.

 

On 1/23/07, Petersson, Mats <Mats.Petersson@xxxxxxx> wrote:

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Derek
> Sent: 23 January 2007 15:31
> To: xen ml
> Subject: [Xen-users] Configuring qemu-dm for use with HVM domU
>
> Hi,
>
> I did a little googling and can't seem to find this answer.
>
> I want to know about configuration options for the qemu video
> card emulation, used by my domU HVM client (Win XP).
>
> Seems like it emulates screen sizes up to 1280x1024
> (selectable within XP domU in the usual way -- right click on
> desktop and go to the display properties tab).  But if I
> select this 1280x1024 size, the resulting X-window on my host
> display has a strange property:  it has no scroll bars, even
> when sized to be smaller than the 1280x1024 client window it
> represents.  Without scroll bars, I can never get to the
> start button, which is just off the bottom of the screen .
> So, in effect I can't use 1280x1024, and the next size down
> is 1024x768 which is much smaller than I'd really like.

That's presumably because your current display is 1280x1024? I don't see
why else it would do like that [unfortunately, my Linux system is only
equipped with a 1280x1024 display in itself, so I'd be in that same
situation].

I run 1024 x 768, and that's fine by me - but it depends on what you're
doing within the Windows domain (I wouldn't like my "real" windows
machine that I write this on to be 1024 x 768, but my virtual Windows
machine is fine at that res).
>
> I was wondering if there's a way to either (1) make the qemu
> display on the host show scroll bars when it's downsized this
> way, or (2) better still, configure qemu to emulate other
> custom sizes less than 1280x1024, but greater than 1024x768.

Although the register (in .../tools/ioemu/hw/cirrus_vga.c) that holds
the width of the resolution is capable of doing any resolotion that is
evenly divisibly by 8, you'll need a driver that can set those values.

When I used to work with display drivers, you could actually provide a
list to the driver that contained the resolution and frequency, and the
driver would calculate back from that, including really weird stuff like
1408 pixels wide or some such, but I suspect the Cirrus driver that MS
has doesn't quite cope with such advanced features.

Aha! I just figured out that you can actually get an intermediate size
setting: you'll get 1152 x 864 - however, only in 8-bit per pixel, so
256 colours... I don't know if this works on the "defualt monitor", but
it worked after I selected a different monitor type and selected "List
all modes" from the display control panel... Maybe that will be better
than VNC.

The other option is of course to use Windows in "Remote Desktop" mode,
where you should be able to set (almost) any size you like... And it's
at least faster than VNC, but may not be as snappy as SDL.

--
Mats

>
> If neither of the above are true, my next question is, how
> are people living with these restrictions?   I could try VNC,
> but I'd hate to give up the snappy response and high quality
> picture I see under Qemu.
>
> Thanks,
> Derek.
>
>
>
>

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