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Re: [Xen-users] PV networking issue in and 2.6.39-rc7 pvops dom

To: Mario <mario@xxxxxxxxxxxxxx>
Subject: Re: [Xen-users] PV networking issue in and 2.6.39-rc7 pvops dom0 kernels
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Tue, 17 May 2011 14:04:40 +0300
Cc: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, "todd.deshane@xxxxxxx" <todd.deshane@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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On Tue, May 17, 2011 at 12:49:18PM +0200, Mario wrote:
> 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:
> 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..?

Set up a serial console and configure Xen + dom0 kernel log to it..
and see what goes wrong. http://wiki.xen.org/xenwiki/XenSerialConsole

ie. does dom0 kernel crash while loading s3fb? 

-- Pasi

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