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Date: Mon, 30 Nov 2009 20:54:42 +0200
From: Avi Kivity <avi@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 0/6] Fix -kernel with SeaBIOS v2
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To: Christoph Hellwig <hch@lst.de>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Glauber Costa <glommer@redhat.com>, Alexander Graf <agraf@suse.de>, Juan Quintela <quintela@redhat.com>

On 11/30/2009 08:50 PM, Christoph Hellwig wrote:
>
>> Sounds like your guest kernel is trying to access an x86_64 register?
>>
>> You can of cause try insmod'ing kvm.ko with ignore_msrs=1. You hopefully
>> don't need syscalls until you get into user space.
>>      
> The option doesn't exist yet in 2.6.31 which I'm running on this box
> because 2.6.32-rc has massive regressions for my workload.  I booted
> into it again anyway to test the option - and interestingly enough
> qemu with -enable-kvm boots just fine even without ignore_msrs=1.
>
> Looks like the problem only happens with older kernels.
>    

Strange - qemu -kernel has zero interaction with the host kernel.  It's 
a totally normal boot process.


-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.