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Re: [Xen-devel] Has Anyone Been Able to Run PVOPS DomU Against any nVidi

To: "John McDermott (U.S. Navy Employee)" <john.mcdermott@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] Has Anyone Been Able to Run PVOPS DomU Against any nVidia Chipset?
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Fri, 17 Sep 2010 11:35:38 -0700
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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 On 09/17/2010 09:53 AM, John McDermott (U.S. Navy Employee) wrote:
> Xen Developers,
> This has already been posted to Xen-Users, but  I got no response.
> Short version: has anyone been able to run a PVOPS domU, on Xen 
> 4.0.1, on Fedora 13, against any nVidia chipset? I'd like to know which 
> chipset please.

By "nVidia chipset" do you mean a system chipset, or specifically a
graphics card?

By "run ... pvops domU ... against any nVidia chipset" do you mean
passing the hardware through to the domU?

Are you running domU as HVM or PV?  If it is HVM, are you using stubdoms?

> Long version:
> I have encountered what appears to be an interesting video or DRM problem 
> with this combination.   Dom0 runs X11 without problems but this combination 
> will not run X11 as dom U. While attempting to install Fedora 13 dom U as an 
> HVM, using a PVOPS dom0, running on Xen 4.0.1 on Fedora 13,  using 
> virt-install --nographics, it reaches the point following the XML display of 
> the boot guest configuration, reports an
> (EE) FBDEV(0): FBIOBLANK: Invalid argument
> error and then hangs with garbage displayed on my remote xterm console. 
> (Virt-install --vnc dies also.) My serial console shows a bunch of hypervisor
> (XEN) HVM2: int13_harddisk: function 41, unmapped device for ELDL=81
> ...
> and then some
> ...
> (XEN) vlapic.c:702:d2 Local APIC Write to read-only register 0x30
> error messages.

I think those are more warnings than errors.  Are there any other error

> I can get a pvops domain U to install --nographics, but the resulting guest 
> cannot start X and fails with the same "(EE) FBDEV(0): FBIOBLANK: Invalid 
> argument". No hypervisor error messages are generated by this failure.

If you're using an emulated FB then it should Just Work, and be
independent of whatever the host graphics chip is - and emulated is
probably what you should be using for install regardless of what you
plan to do once the guest is installed.

If you are passing through a graphics controller, how are you making
sure that dom0 isn't also using it?

> I have tried to get this kernel-hypervisor combination working on 2 different 
> boxes:
> 1)  a Dell Precision 690 with an Intel E6320 processor (I don't think this is 
> the issue) and an nVidia Quadro NVS 285, which X11 reports as nVidia NV 44. 
> Plain old Fedora 13 uses the nouveau driver with no problems. Udev tells me 
> it is version 153. The problem remains even with the kernel booted nopat.
> 2) a "roll-your-own" with EVGA X58 SLI motherboard / Intel i7 combination, 
> with an nVidia GEForce 9800 GTX+, which X11 reports as nVidia G92. Again, 
> plain old Fedora 13 uses the nouveau driver for this, without problems. 
> Trying a pvops domU gives me the same behavior: Fedora domU installs and runs 
> fine, but cannot start X11.
> I have tried this against 2 kernels: Jeremy's e6b92c and Michael Young's 
> (The latter fails in video during kernel 
> boot, when I use init=/sbin/upstart, but boots OK without it, but then fails 
> to run X on domU's.) When building these kernels, both complain about missing 
> the nouveau module at depmod time.
> Before I go swapping cards or outright buying one, has anyone run this pvops 
> combination against any nVidia-based graphics card? Does pvops require an ATI 
> chipset?

Konrad has done a lot of work on making many different graphics cards
work, including nVidia, at least in dom0.

>  Has pvops been run against an onboard Matrox chipset, as on a server?

Yes, my home server machine has a Matrox controller which works OK.


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