Re: Cannot start Fedora 19 HVM domU with VGA passthru

["Singapore Citizen Mr. Teo En Ming (Zhang Enming)" <singapore.mr.teo.en.ming@gmail.com>]

On 18/07/2013 21:55, Gordan Bobic wrote:
> On Thu, 18 Jul 2013 21:13:54 +0800, "Singapore Citizen Mr. Teo En Ming 
> (Zhang Enming)" <singapore.mr.teo.en.ming@gmail.com> 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@gmail.com> 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@gmail.com> 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@gmail.com> 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@gmail.com> 
>>>>>>>>> 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@gmail.com> 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@gmail.com> 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@gmail.com> 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@gmail.com> 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
>
Dear Gordan,

Do you know how to solve the problem of Fedora 19 HVM domU not starting 
up in Ubuntu 13.04 dom0 with Intel IGD VGA passthrough?

-- 
Yours sincerely,

Singapore Citizen Mr. Teo En Ming (Zhang Enming)