Re: [Qemu-devel] drop -enable-nesting

[Jan Kiszka]

On 2011-05-30 16:38, Nadav Har'El wrote:
> On Mon, May 30, 2011, Jan Kiszka wrote about "drop -enable-nesting (was: 
> [PATCH 3/7] cpu model bug fixes and definition corrections...)":
>> On 2011-05-30 10:18, Roedel, Joerg wrote:
>>> On Sat, May 28, 2011 at 04:39:13AM -0400, Jan Kiszka wrote:
>>>
>>>> Jצrg, how to deal with -enable-nesting in qemu-kvm to align behavior
>>>> with upstream?
>>>
>>> My personal preference is to just remove it. In upstream-qemu it is
>>> enabled/disabled by +/-svm. -enable-nesting is just a historic thing
>>> which can be wiped out.
> 
> "-enable-nesting" could remain as a synonym for enabling either VMX or SVM
> in the guest, depending on what was available in the host (because KVM now
> supports both nested SVM and nested VMX, but not SVM-on-VMX or vice versa).

Why? Once nesting is stable (I think SVM already is), there is no reason
for an explicit enable. And you can always mask it out via -cpu.

BTW, what are the defaults for SVM right now in qemu-kvm and upstream?
Enable if the modeled CPU supports it?

Jan

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