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Re: [Qemu-devel] [PATCH 1/3] qemu-kvm: Invert svm-flag setting logic

From: Alexander Graf
Subject: Re: [Qemu-devel] [PATCH 1/3] qemu-kvm: Invert svm-flag setting logic
Date: Tue, 7 Sep 2010 14:37:33 +0200

On 07.09.2010, at 14:35, Avi Kivity wrote:

> On 09/07/2010 03:33 PM, Alexander Graf wrote:
>>> I agree that its much nicer for mgmt tools if svm/vmx CPU flags can just be
>>> toggled in the normal manner. Might we also want to have a enable/disable
>>> nesting flag, so we can mirror the way real hardware lets you disable virt
>>> in the BIOS even when the CPU(s) have the vmx/svm flags set ?
>> I don't see how that's useful. We don't model anything like this in the kvm 
>> kernel module, so whatever we expose in user space would not be useful for 
>> detection testing. Also I'm fairly sure you either want nesting or you don't 
>> :). And if you want nesting, you probably want -cpu host too, since you lose 
>> migration anyways.
> Why do you lost migration?

Is that part fixed already? Joerg worked so hard on so many things that I lost 
track of what works and what doesn't :).


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