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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: Mon, 16 May 2011 16:22:31 +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 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

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