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 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.
>
> Gordan
>

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.

-- 
Yours sincerely,

Singapore Citizen Mr. Teo En Ming (Zhang Enming)