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

To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-users] PV networking issue in and 2.6.39-rc7 pvops dom0 kernels
From: Mario <mario@xxxxxxxxxxxxxx>
Date: Tue, 17 May 2011 12:49:18 +0200
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 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)


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

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:



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..?

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