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

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


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

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?


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