Re: [Xen-devel] [HVM} xen_platform_pci=0 doesn't prevent platform device creation and disk and nic take over by PV drivers.

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Hello Sander,

Wednesday, October 9, 2013, 1:54:52 PM, you wrote:


> Wednesday, October 9, 2013, 1:40:00 PM, you wrote:

>> On Wed, 9 Oct 2013, Sander Eikelenboom wrote:
>>> Hi,
>>> 
>>> While trying to get to the bottom of my passthrough problem with the rom 
>>> bar,
>>> i noticed that specifiying "xen_platform_pci=0" in the config file does not 
>>> prevent
>>> the platform device to appear in my HVM guest and consequently the disk and 
>>> nic are taken over.
>>> 
>>> Running latest xen-unstable, together with upstream qemu and upstream 
>>> seabios.

>> I think that xen_platform_pci has never been implemented with upstream
>> QEMU.
>> However you can pass xen_emul_unplug=never to Linux to avoid
>> initializing netfront and blkfront.


> Tried with xen_platform_pci=0 with qemu-xen-traditional and that makes a 
> linux 3.12-rc3 kernel crash on boot
> unfortunatly the strack trace runs from the small vnc screen here :S

> screenshot of what is left attached

It also crashes on kernel 3.9.2 and 3.9.0-rc3, and 3.8.13
but not on the debian supplied 3.2.0 and 3.8.0-rc2.

So the cause seems to be introduced or backported to the 3.8 series somewhere.


> Pfrrt wat a mess


-- 
Best regards,
 Sander                            mailto:linux@xxxxxxxxxxxxxx


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