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Re: [Qemu-devel] Fwd: Guest VM debug (Int 3 panic)

From: Hu Yaohui
Subject: Re: [Qemu-devel] Fwd: Guest VM debug (Int 3 panic)
Date: Thu, 26 Sep 2013 17:51:07 -0400

On Thu, Sep 26, 2013 at 3:20 PM, Hu Yaohui <address@hidden> wrote:

On Thu, Sep 26, 2013 at 3:07 PM, Jan Kiszka <address@hidden> wrote:
On 2013-09-26 20:53, Hu Yaohui wrote:
> Hi Jan,
> I am working on some Nested VM related projects. Some other teammates have
> made the modifications to the kvm module.

And these modifications cannot cause the misguided INT3?

> Most of my work depends on his.
> If I could not use Qemu Debug method. Could you please suggest some other
> debugging methods to debug the L2 guest OS(printk, hijack kernel function,
> or something else)?

Remove L0 while debugging L2 and, once it works, move L1/L2 back over
L0? Your setup seems to be pretty special with (for us) unknown
requirements, so it's hard to suggest what to do best.

I will try that.
When I remove L0 while debugging L2, it works, but When I move it back, it failed with the same error message in L2 guest. Thank you Jan! I will figure out some other methods to overcome this hurdle.
In any case, you seem to be pretty much "off-track" and may either have
to stabilize the whole stack on your own, possibly back-porting
essential nVMX fixes from latest versions, or rebase & share your
changes so that we can help again.

Thank you! 

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