From mboxrd@z Thu Jan  1 00:00:00 1970
From: Anthony Liguori <anthony@codemonkey.ws>
Subject: Re: BUG: linux guest with paravirt support thinks it
 boots on bare hardware
Date: Sun, 30 Mar 2008 15:32:44 -0500
Message-ID: <47EFF8EC.90708@codemonkey.ws>
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	<4701D867-519B-4D72-B606-B6DA9D3C4F55@csgraf.de>
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Cc: Felix Leimbach <felix.leimbach@gmx.net>,
	kvm-devel@lists.sourceforge.net
To: Alexander Graf <alex@csgraf.de>
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Alexander Graf wrote:
>
> On Mar 30, 2008, at 9:44 PM, Anthony Liguori wrote:
>
>> Felix Leimbach wrote:
>>> While testing the new virtio drivers in linux-2.6.25 my test
>>> 2.6.25-rc7-git5 guest with paravirt support running in KVM-64 thinks it
>>> sits on cold and unfriendly bare metal instead of a safe and cosy KVM
>>> bed ;-)
>>> Because it is very unhappy it emits the following message during boot:
>>> Booting paravirtualized kernel on bare hardware
>>>
>>> Of course the guest still runs perfectly and I am indeed very impressed
>>> by KVM and its performance. A big thanks to all the hard working devs
>>> for that!
>>>
>>> Relevant config and dmesg below.
>>>
>>> regards,
>>> Felix
>>>
>>> # zcat /proc/config.gz |grep '\(VIRT\|VMI\|XEN\)'
>>> CONFIG_PARAVIRT_GUEST=y
>>> CONFIG_XEN=y
>>> CONFIG_VMI=y
>>> CONFIG_PARAVIRT=y
>>> CONFIG_VIRT_TO_BUS=y
>>> # CONFIG_XEN_BLKDEV_FRONTEND is not set
>>> CONFIG_VIRTIO_BLK=y
>>> CONFIG_XEN_NETDEV_FRONTEND=y
>>> CONFIG_VIRTIO_NET=y
>>> CONFIG_HVC_XEN=y
>>> # CONFIG_FB_VIRTUAL is not set
>>> CONFIG_VIRTUALIZATION=y
>>> CONFIG_VIRTIO=y
>>> CONFIG_VIRTIO_RING=y
>>> CONFIG_VIRTIO_PCI=y
>>> CONFIG_VIRTIO_BALLOON=y
>>>
>>
>> You're probably missing:
>>
>> CONFIG_KVM_CLOCK=y
>> CONFIG_KVM_GUEST=y
>
> Where do I find a kernel branch that supports these?

The master branch in Avi's tree has support for both of these.

Regards,

Anthony Liguori

> Alex


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