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Re: [Xen-users] Nvidia drivers in Dom0 results in blank screen

To: Brandon Turner <bturner@xxxxxxxxxx>
Subject: Re: [Xen-users] Nvidia drivers in Dom0 results in blank screen
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Wed, 16 Dec 2009 09:16:27 +0200
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On Tue, Dec 15, 2009 at 03:24:30PM -0600, Brandon Turner wrote:
> On 12/15/2009 12:58 PM, Andrew Lyon wrote:
> > On Tue, Dec 15, 2009 at 4:40 PM, Brandon Turner <bturner@xxxxxxxxxx> wrote:
> >   
> >> I am trying
> >> to get the Nvidia binary drivers working on my Ubuntu Dom0.
> >>
> >> I used the kernel sources at
> >> git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git to build my
> >> kernel
> > Nvidia binary drivers do not work with pv_ops dom0 kernel, it is
> > possible to get them working with a "classic" dom0 kernel (i.e forward
> > ported 2.6.18 patches) but it requires some kludges and only works on
> > certain kernel versions.
> >
> > Andy
> >   
> Thank you.  I'm not sure how I missed this.  It was even discussed on
> this list back in July:
> http://lists.xensource.com/archives/html/xen-users/2009-07/msg00333.html
> I read on the Xen Wiki
> (http://wiki.xensource.com/xenwiki/XenDom0Kernels) that future Xen
> versions (3.5/4.0) will default to the pv_ops dom0 kernel.  As most of
> the Nvidia drivers are distributed in binary format, does this mean that
> Nvidia would have to modify their driver code (aka specifically support
> Xen pv_ops dom0) for this to work with future Xen versions?  In this
> case it probably wouldn't be wise for me to go down the binary drivers
> path and should either try something else or settle on nv.
> Does anyone know how long the "old-style" dom0 kernel will be
> supported?  Will Xen 3.5/4.0 support both, with pv-ops as the default,
> or is the idea to eventually drop the old-style kernel.  As a noob to
> Xen, what is the significance of kernel version 2.6.18?  Did something
> in the kernel change that doesn't allow for an older style dom0 kernels,
> or is it just more effort then its worth to branch the newer releases
> (especially with all the pv_ops success).

Xen 4.0 will have the pv_ops dom0 as the default kernel, but 2.6.18-xen
will be supported aswell, afaik.

2.6.18-xen has been the default for so long because that's what Citrix
uses in their commercial Citrix XenServer products.

Another reason is the fact that the 2.6.18-xen patches had to be
rewritten to be acceptable into upstream Linux.. and that has taken
long, first the general pv_ops framework had to be written, then the
domU support for pv_ops, and now finally dom0 support.

-- Pasi

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