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 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.
>>>
>>> Gordan
>>>
>> Dear Gordan,
>>
>> 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?
>
> Gordan
>

Dear Gordan,

I have checked "lsmod | grep i915" and the command doesn't return 
anything, which means the kernel module i915 is not loaded in dom0.

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

-- 
Yours sincerely,

Singapore Citizen Mr. Teo En Ming (Zhang Enming)