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Re: [Qemu-devel] [PATCH 0/6] Fix -kernel with SeaBIOS v2

From: Avi Kivity
Subject: Re: [Qemu-devel] [PATCH 0/6] Fix -kernel with SeaBIOS v2
Date: Mon, 30 Nov 2009 20:54:42 +0200
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20090922 Fedora/3.0-3.9.b4.fc12 Thunderbird/3.0b4

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 

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