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

[Gordan Bobic <gordan@xxxxxxxxxx>]

On Thu, 18 Jul 2013 18:20:08 +0800, "Singapore Citizen Mr. Teo En Ming 
(Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx> wrote:
> On 18/07/2013 18:09, Gordan Bobic wrote:
> > On Thu, 18 Jul 2013 18:07:27 +0800, "Singapore Citizen Mr. Teo En 
> > Ming (Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx> wrote:
> > > On 18/07/2013 16:46, Gordan Bobic wrote:
> > > > 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.
> > > I cannot start Fedora 19 HVM domU with VGA passthrough at all. 
> > > Could
> > > you advise me on the workaround?
> > >
> > > As for the Intel HD Graphics (i915) driver, I have it blacklisted 
> > > in
> > > /etc/modprobe.d/blacklist.conf already. Please refer to attached
> > > blacklist.conf.
> > Have you confirm that no other driver is bound to the device in 
> > lspci -vvv?
> > Also what version of Xen are you running on each of the distros, and 
> > which
> > dom0 kernel?
> I have checked "lsmod | grep i915" and the command doesn't return
> anything, which means the kernel module i915 is not loaded in dom0.
Check lspci -vvv,find the device in the output and look for the lines 
that say:
Kernel driver in use:
Kernel modules:

The kernel driver might not be called the same thing in both kernels.

> I am running Xen 4.4-unstable changeset 27238 with Linux kernel
> 3.11.0-rc1 on a Ubuntu 13.04 host.
And on F19?

Gordan

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