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Re: [Qemu-devel] drop -enable-nesting
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] drop -enable-nesting |
Date: |
Mon, 30 May 2011 17:59:23 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2011-05-30 17:16, Nadav Har'El wrote:
> On Mon, May 30, 2011, Jan Kiszka wrote about "Re: drop -enable-nesting":
>>> "-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.
>
> As far as I understand (and this was previously discussed on the QEMU mailing
> list), the default emulated CPU does not include the "vmx" capability, and you
> need to enable it with something like "-cpu qemu64,+vmx" (or "-cpu host").
qemu64 is an artificial AMD model. Adding VMX to it may have interesting
effects on the guests. Better use host or a recent Intel model.
>
> I am not sure if it does enable the "svm" capability. If it does, it isn't
> useful when KVM is enabled and the underlying host has VMX, not SVM.
That's what KVM is supposed to filter based on the host's capabilities.
I bet it does already.
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
- Re: [Qemu-devel] drop -enable-nesting, (continued)
- Re: [Qemu-devel] drop -enable-nesting, Daniel P. Berrange, 2011/05/31
- Re: [Qemu-devel] drop -enable-nesting, Avi Kivity, 2011/05/31
- Re: [Qemu-devel] drop -enable-nesting, Roedel, Joerg, 2011/05/31
- Re: [Qemu-devel] drop -enable-nesting, Paolo Bonzini, 2011/05/31
- Re: [Qemu-devel] drop -enable-nesting, Avi Kivity, 2011/05/31
- Re: [Qemu-devel] drop -enable-nesting, Nadav Har'El, 2011/05/30
- Re: [Qemu-devel] drop -enable-nesting,
Jan Kiszka <=