Re: [Xen-users] OpenSuse 11 hvm domU: screen resolution up to 640x480

[jim burns <jim_burn@xxxxxxxxxxxxx>]

On Sun November 6 2011, 9:52:48 AM, Flavio wrote:
> On 6 November 2011 09:44, jim burns <jim_burn@xxxxxxxxxxxxx> wrote:
> > If you do a 'rpm -qi qemu-system-x86' (or whatever the package name is
> > in your system (and package manager)), you'll see that is a kvm
> > package, and thus not modified for xen.
> 
> OK.
> 
> > I've never had to do a linux hvm install, so I can't comment on the
> > differences.
> 
> I think it's just a performance issue. As far as I know, there is no
> longer great difference
> between hvm and pv guest in XEN.

No, I mean there may be a difference between how linux and windows look at the 
emulated devices qemu-dm provides - in particular, they may honor or ignore 
some of the config file options, like eg: videoram=.

> > Could be that the 'videoram=' option is only meant for linux or
> > windows, but not both.
> 
> I don't think so. I have a windows-7 (but also a windows-xp) and a
> CentOS domU (not hvm)
> both using videoram=16 and stdvga=1, and there is no problem. High
> resolution in both cases.

Umm - videoram and stdvga are hvm config file options. If the CentOS is pv, 
it's ignoring them.

> > I do know I get the cirrus model in my winxp domu with
> > 'stdvga=0', and I get the 4M videoram error with videorams greater than
> > 4 and using 'xl create'.
> 
> This happens to me only with this opensuse hvm guest. Now I've finally
> got the setup under
> qemu-system-x86_64 system working, so, I will see what will happen in
> this case, when
> I will boot the domU as a PV guest and not hvm.

Umm - if you are using kvm's qemu, I believe you are by definition doing an 
hvm install - qemu is an emulator. Xen's qemu-dm is modified to provide pv 
drivers depending on the -M option. Look at a '/bin/ps a -A|grep qemu'. For 
hvm, it will say '-M xenfv', and for pv it will say '-M xenpv'.

> > I have also noticed that being limited to videoram=4 in my
> > winxp domu doesn't prevent me from getting 1280x1024 in vnc.
> 
> mmmh.. So the screen resolution limitation is not related to this problem...
> interesting and much more confusing.
> 
> I will let you know.
> 
> Thank you.
> --
> Flavio

The only other thing I can think of - in the opensuse domu's 
/boot/grub/memu.lst, on the 'kernel' line, make sure you are specifying the 
vga= parm. With me, vga=0x31a gives me 1280x1024. Or, you could specify 
vga=ask, and run thru the possibilities.

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