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Re: [Xen-users] paravirtualised gentoo on Fedora Core 7

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Subject: Re: [Xen-users] paravirtualised gentoo on Fedora Core 7
From: Andris <andris@xxxxxxxx>
Date: Fri, 19 Oct 2007 14:40:29 +0300
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Mark Williamson wrote:
>> Tank you for answer,
>> I got some basic understanding...
>> Yes indeed I hadn't compiled a framebuffer support into my gentoo kernel.
>> I added xen fb an console fb support and modified grub with
>> video=vesafb:ywrap,mtrr:0 vga=0x311  (nothing know about mttr value :) )
> You shouldn't need the vga= line for a paravirtualised kernel.  My kernel is 
> configured with video= set to "video=xenfb" to tell it explicitly to use the 
> Xen Framebuffer.  There isn't a vesa framebuffer available to a paravirt 
> guest.
>> Now I am able to get vnc  screen at boot startup, but just till "Freeing
>> unused kernel memory" line, further nothing... console hangs. At the same
>> time DomU is still alive and booted. I can ssh into it. Something missed to
>> add to kernel?
> I wanted to make sure that would work first!  Now we need to add to it...
> Add "console=tty1" to your kernel command line.  This should tell the OS to 
> output boot console output to tty1, which should display on the framebuffer 
> console.
> Does that help?
> Cheers,
> Mark
>> andris
>> Mark Williamson wrote:
>>> Well, that's a start.  Did you configure the Xen framebuffer device (and
>>> framebuffer console) into the kernel?  If not then you wouldn't be able
>>> to access the PV framebuffer from dom0.
>>> Cheers,
>>> Mark
>> ----------------------------------------------------------------
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Thanks for help,
I read also this thread "Re: [Xen-users] dom0 no longer showing serial
console output" , and modified my grub.conf accordingly.
My kernel boot parameters now is  kernel
/boot/vmlinuz-2.6.20.r6-gentoo-xenU root=/dev/xvda video=xenfb
console=ttyS0 xencons=ttyS vga=0x311
Now I am able to use vnc console, the only thing is that I do not see
kernel boot  messages any more, but only login prompt. Of course it is
ok for me :).
Then what method is used for fedora kernel? I put no kernel boot
parameters for fedora kernel and see everything. I just want to
understand howo kompile xen pv DomU kernel for everything to work
properly. Sometimes it is useful to see kernel boot messages when
something goes wrong.


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