Re: PV networking issue in 2.6.38.6 and 2.6.39-rc7 pvops dom0 kernels

[Mario <mario@slackverse.org>]

On 05/16/2011 03:22 PM, Pasi Kärkkäinen wrote:
> On Mon, May 16, 2011 at 03:15:53PM +0200, Mario wrote:
>> On 05/16/2011 03:09 PM, Mario wrote:
>>> On 05/16/2011 03:06 PM, Ian Campbell wrote:
>>>> On Mon, 2011-05-16 at 14:04 +0100, Mario wrote:
>>>>> So you are telling me that 2.6.38 does not have a working networking on
>>>>> PV guests, but HVM does?
>>>>
>>>> Yes, netback did not go upstream until 2.6.39 so PV networking (either
>>>> for PV or HVM guests with PV drivers) will not work on mainline kernels
>>>> before that.
>>>>
>>>> Emulated HVM networking does not use netback so that will work on
>>>> earlier kernels (it depends on qemu)
>>>>
>>>> Ian.
>>>>
>>>
>>> Ok, thanks, it all makes more sense now. :-)
>>
>>
>> Ian, while i have your attention, any idea why some framebuffer devices
>> blank screen when dom0 boots up. I have seen this happen mostly on older
>> vga cards but its not a rule. Should i just keep on blacklisting kernel
>> modules for those cards, or is there some kind of a more general
>> solution?
>
> You could try "nomodeset" parameter to disable KMS modesetting..
> (and possibly adding "console=tty0")
>
> Xen patches for DRM/KMS haven't been merged to upstream Linux yet.
>
> -- Pasi
>


nomodeset and/or nofb do not seem to help.
console=tty0 also does not seem to have any effect.

Only way to successfuly boot dom0 is with one of these:

CONFIG_FB=n

or

echo "blacklist s3fb" > /etc/modprobe.d/blacklist-s3fb.conf

As soon as fb device is modprobed, booting stops, and server freezes.
Can anything else be done? Perhaps some setting for xen in kernel..?