Xen users - May 2011 - Blank screen (but not frozen) on boot with Xen 4.1 and 2.6.38 pv_ops

Hello,

I''ve installed a fresh Gentoo box and wanted to give pv_ops a try.

After installing Xen 4.1 and fetching the latest 2.6.38 kernel, I''ve
compiled the kernel and tried to boot it. On bare metal (no xen), it
runs perfectly, but if I try to chainboot via xen, the machine boots
fine (can connect to it via SSH and dmesg shows xen is working) but on
the machine itself I have no image on the display. The video card is a
nVIDIA 8500GT, for reference.

After hitting <enter> in grub, I can see the XEN hypervisor booting
(messages prefixed with (XEN) ) but when it gets to the actual dom0
kernel, the image stays blank forever.

XEN hypervisor log: http://pastebin.com/AYbP2VDT
dom0 log: http://pastebin.com/dJFRfyYn
dom0 kernel config: http://pastebin.com/DcF3tfS0

As you can see, there''s no kinky stuff involved, such as framebuffer
or special drivers...

Any thoughts/hints?

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I am having a very similar problem with Xen 4.1 and Linux version
2.6.39-rc7 running on the latest Slackware.

As soon as the dom0 kernel begins to boot my screen goes blank.

I can still access the system via SSH.  I chalked it up to using a
development kernel and may try another version.

I need aes-xts-plain64 support which 2.6.32.x does not include.

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Hello,

As a follow-up, there seems to be a workaround that works for me, at
least, on both 2.6.38 and 2.6.39-rc.

If you compile the framebuffer into your kernel and the kernel loads
it (I compiled the nouveau driver, since I have a nvidia card), the
display shows up as soon as the framebuffer loads.

Strange, though, that the plain-text console doesn''t show anything...

2011/5/17 Claudiu Curcă <alexstrasza2@gmail.com>:
> Hello,
>
> I''ve installed a fresh Gentoo box and wanted to give pv_ops a try.
>
> After installing Xen 4.1 and fetching the latest 2.6.38 kernel,
I''ve
> compiled the kernel and tried to boot it. On bare metal (no xen), it
> runs perfectly, but if I try to chainboot via xen, the machine boots
> fine (can connect to it via SSH and dmesg shows xen is working) but on
> the machine itself I have no image on the display. The video card is a
> nVIDIA 8500GT, for reference.
>
> After hitting <enter> in grub, I can see the XEN hypervisor booting
> (messages prefixed with (XEN) ) but when it gets to the actual dom0
> kernel, the image stays blank forever.
>
> XEN hypervisor log: http://pastebin.com/AYbP2VDT
> dom0 log: http://pastebin.com/dJFRfyYn
> dom0 kernel config: http://pastebin.com/DcF3tfS0
>
> As you can see, there''s no kinky stuff involved, such as
framebuffer
> or special drivers...
>
> Any thoughts/hints?
>
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Am 17.05.2011 15:21, schrieb Claudiu Curcă:
> After hitting <enter> in grub, I can see the XEN hypervisor booting
> (messages prefixed with (XEN) ) but when it gets to the actual dom0
> kernel, the image stays blank forever.
Same problems here:
dom0 boots fine, but without any output.

I tried 3.0-rc1, actually.

I disabled all framebuffer related kernel options. Just simple VGA
console. Also tried console=hvc0 or console=xvc0 or something similar.


Any ideas?


Regards,
  Sven


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Am 19.05.2011 12:11, schrieb Claudiu Curcă:
> Hello,
> 
> As a follow-up, there seems to be a workaround that works for me, at
> least, on both 2.6.38 and 2.6.39-rc.
> 
> If you compile the framebuffer into your kernel and the kernel loads
> it (I compiled the nouveau driver, since I have a nvidia card), the
> display shows up as soon as the framebuffer loads.
> 
> Strange, though, that the plain-text console doesn''t show
anything...
Have you seen the thread called "Xen 4.1 PVOPS 3.0.0-RC1 VGA Console"
on
the developers list?

I posted a link to the patches for 2.6.39 and posted a patch for
3.0-rc1. With these patches, the VGA text console works just fine.


Regards,
  Sven


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