Re: [Xen-users] [Xen-devel] Cannot start Fedora 19 HVM domU with VGA passthru

[Gordan Bobic <gordan@xxxxxxxxxx>]

On Thu, 18 Jul 2013 16:37:34 +0800, "Singapore Citizen Mr. Teo En Ming 
(Zhang Enming)"	<singapore.mr.teo.en.ming@xxxxxxxxx> wrote:
> Although Fedora 19 HVM domU with VGA passthrough cannot start, Debian
> 7.1.0 amd64 HVM domU with VGA passthrough can start. In Debian 7.1.0
> amd64 HVM domU with VGA passthrough, Intel HD Graphics 4600 is listed
> in lspci -vvv. Please refer to lspci.txt. It is strange that no 
> kernel
> module is being loaded for Intel HD Graphics 4600. There is no 
> "Kernel
> driver in use" statement after VGA compatible controller: Intel
> Corporation Haswell Integrated Graphics Controller (rev 06) (prog-if
> 00 [VGA controller]).
>
> No kernel driver is seen in lsmod. Please refer to lsmod.txt
>
> When I tried to load the kernel module by executing "modprobe i915",
> it complains "no such device".
>
> ERROR: could not insert 'i915': No such device
>
> So is my Intel HD Graphics 4600 VGA Passthrough to Debian 7.1.0 amd64
> HVM domU considered successful since the i915 driver cannot be 
> loaded?
> Thank you very much.
If you have a driver in dom0 claiming the device (other than the 
xen-pciback
driver), you cannot pass through that device. If you do lspci -ccc on 
F19
and you see the driver in use for that device being something other 
than
xen-pciback, that would explain why you can't pass it through.

Also, did you first do xl pci-assignable-add for that device? This 
attempts
to detach the device from it's current driver but doesn't always work
especially for GPUs. The only solution is blacklist the driver for the
device in dom0. The downside is that you cannot run a GUI in dom0 on 
that
device.

Gordan

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