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>]

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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.

Thank you very much.

-- 
Yours sincerely,

Singapore Citizen Mr. Teo En Ming (Zhang Enming)


[-- Attachment #2: blacklist.conf --]
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# This file lists those modules which we don't want to be loaded by
# alias expansion, usually so some other driver will be loaded for the
# device instead.

# evbug is a debug tool that should be loaded explicitly
blacklist evbug

# these drivers are very simple, the HID drivers are usually preferred
blacklist usbmouse
blacklist usbkbd

# replaced by e100
blacklist eepro100

# replaced by tulip
blacklist de4x5

# causes no end of confusion by creating unexpected network interfaces
blacklist eth1394

# snd_intel8x0m can interfere with snd_intel8x0, doesn't seem to support much
# hardware on its own (Ubuntu bug #2011, #6810)
blacklist snd_intel8x0m

# Conflicts with dvb driver (which is better for handling this device)
blacklist snd_aw2

# causes failure to suspend on HP compaq nc6000 (Ubuntu: #10306)
blacklist i2c_i801

# replaced by p54pci
blacklist prism54

# replaced by b43 and ssb.
blacklist bcm43xx

# most apps now use garmin usb driver directly (Ubuntu: #114565)
blacklist garmin_gps

# replaced by asus-laptop (Ubuntu: #184721)
blacklist asus_acpi

# low-quality, just noise when being used for sound playback, causes
# hangs at desktop session start (Ubuntu: #246969)
blacklist snd_pcsp

# ugly and loud noise, getting on everyone's nerves; this should be done by a
# nice pulseaudio bing (Ubuntu: #77010)
blacklist pcspkr

# EDAC driver for amd76x clashes with the agp driver preventing the aperture
# from being initialised (Ubuntu: #297750). Blacklist so that the driver
# continues to build and is installable for the few cases where its
# really needed.
blacklist amd76x_edac

blacklist i915

blacklist snd_hda_intel

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