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

[Gordan Bobic <gordan@xxxxxxxxxx>]

On Thu, 18 Jul 2013 20:57:55 +0800, "Singapore Citizen Mr. Teo En Ming 
(Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx> wrote:
> On 18/07/2013 20:35, Gordan Bobic wrote:
> > On Thu, 18 Jul 2013 20:29:41 +0800, "Singapore Citizen Mr. Teo En 
> > Ming (Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx> wrote:
> > > On 18/07/2013 20:03, Gordan Bobic wrote:
> > > > On Thu, 18 Jul 2013 19:23:58 +0800, "Singapore Citizen Mr. Teo En 
> > > > Ming (Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx> wrote:
> > > > > On 18/07/2013 19:02, Gordan Bobic wrote:
> > > > > > On Thu, 18 Jul 2013 18:55:55 +0800, "Singapore Citizen Mr. Teo 
> > > > > > En Ming (Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx> 
> > > > > > wrote:
> > > > > > > On 18/07/2013 18:44, Gordan Bobic wrote:
> > > > > > > > On Thu, 18 Jul 2013 18:40:51 +0800, "Singapore Citizen Mr. Teo 
> > > > > > > > En Ming (Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx> 
> > > > > > > > wrote:
> > > > > > > > > On 18/07/2013 18:29, Gordan Bobic wrote:
> > > > > > > > > > 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:
> > > > > > [...]
> > > > > >
> > > > > > > > > I have checked lspci -vvv in Ubuntu 13.04 dom0 and the Kernel 
> > > > > > > > > driver
> > > > > > > > > in use is pciback for Intel HD Graphics 4600 IGD.
> > > > > > > > >
> > > > > > > > > As for Fedora 19 HVM domU, I don't know because I cannot 
> > > > > > > > > start it.
> > > > > > > > Starting is not required to do this. Do it before starting the 
> > > > > > > > domU.
> > > > > > > Sorry, I don't understand what you're trying to say.
> > > > > > On F19, don't worry about starting the domU. In dom0, do lspci 
> > > > > > -vvv,
> > > > > > find the Intel graphics device in the output and find what 
> > > > > > kernel
> > > > > > driver / module are bound to it, if any. You can only pass 
> > > > > > through
> > > > > > a PCI device that is connected to the xen pciback driver, and 
> > > > > > even
> > > > > > then often only if no other driver had connected to the device 
> > > > > > first
> > > > > > since that might leave it in an unknown state.
> > > > > But I can only start Fedora 19 HVM domU with-out vga passthrough. 
> > > > > I
> > > > > want to be able to start Fedora 19 HVM domU with vga passthrough.
> > > > You are trying to get one step ahead of what I am talking about.
> > > > Forget domU for the moment. Before you can even begin thinking
> > > > about the domU you have to make sure the device is available
> > > > for assigning in dom0. If you have a driver bound to the device
> > > > in dom0 you cannot pass it through to domU. So forget domU until
> > > > you have actually confirmed there is no driver bound to the
> > > > device in dom0.
> > > >
> > > > What do the following two lines say for the device in lspci -vvv
> > > > in _dom0_ on Fedora:
> > > > Kernel driver in use:
> > > > Kernel modules:
> > > I have attached the output of lspci -vvv in Ubuntu 13.04 dom0. The
> > > filename of the attachment is dom0-lspci.txt.
> > You need to do this as root, otherwise some of the output is 
> > missing.
> > And the dump from the machine where you have domU working isn't
> > useful, you need to post the same lspci dump from the system
> > where it _doesn't_ work.
> >
> > Gordan
> I have attached the output of lspci -vvv as root in Ubuntu 13.04
> dom0. The filename of the attachment is root-dom0-lspci.txt.
Right, that is showing
Kernel driver in use: pciback
for the Intel VGA device.

But that is expected, you said you have it working on Ubuntu.
You now need to make sure you have the same lspci output on
Fedora dom0 before you start the domU.

Gordan

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