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

[Gordan Bobic <gordan@xxxxxxxxxx>]

On Thu, 18 Jul 2013 21:13:54 +0800, "Singapore Citizen Mr. Teo En Ming 
(Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx> wrote:
> On 18/07/2013 21:04, Gordan Bobic wrote:
> > 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.
> > > 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.
> I think you are confused. I only have *one* dom0, which is the Ubuntu
> 13.04 dom0. I don't have any other dom0.
>
> What I am trying to do is to start Fedora 19 HVM domU in Ubuntu 13.04
> dom0, but am unable to.
>
> Hope this clears everything.
It does, thanks. I was under the impression you were dual booting dom0s
and one was letting you boot domU and the other wasn't. Apologies.

Gordan

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